TABLE OF CONTENTS 1. SERVICE NOTES 4 2. GENERAL 5 3. DISASSEMBLY 12 4. TEST MODE 19 5. ELECTRICAL ADJUSTMENTS 30 6. DIAGRAMS
6-1. 6-2. 6-3. 6-4. 6-5. 6-6. 6-7. 6-8. 6-9. 6-10. 6-11. 6-12. 6-13. 6-14. Circuit Boards Location 34 Block Diagram MZ-R5ST 35 Block Diagram MZS-R5ST 38 Printed Wiring Board MD Mechanism Section 41 Schematic Diagram MD Mechanism Section 43 Printed Wiring Board MD Main Section 45 Schematic Diagram MD Main Section (1/3) 49 Schematic Diagram MD Main Section (2/3) 52 Schematic Diagram MD Main Section (3/3) 55 Printed Wiring Board Station Main Section 59 Schematic Diagram Station Main Section 63 Schematic Diagram Station Control Section 66 Printed Wiring Board Station Control Section 69 Printed Wiring Board MD Power Supply, Switch Section 71 6-15. Schematic Diagram MD Power Supply, Switch Section 73 6-16. IC Block DIiagrams 75 6-17. IC Pin Function 79

MAIN FEATURES

MZ-R5ST is the new Sony portable MiniDisc Recorder using the MiniDisc format. The MiniDisc station system Use the recorder either by itself or attached to the station dock. Use the recorder attached to the station to enjoy full features and connectivity. Use the recorder detached from the station for portability. High-fidelity recording Low-noise, how-distortion, high fidelity recording through the optical digital input jack. Sampling rate converter This unit enables you to record programs form digital equipment using other sampling rates, such as a BS tuner or DAT deck. Variety of recording options Long recording with monaural recording (up to 148 minutes). Time Machine recording enables you to record from the top of a song even if you pressed the button after you heard the beginning of the song. Connect to an audio-timer to record when you are not home. Easy editing with the large LCD panel and the editing buttons Title samples (21 words and phrases). UNDO function lets you undo an editing operation. Programmed playback Play any set of tracks in the order of your choice. Card remote commander Operate the station from a distance. Direct Selection available. Output jack for active speakers Connect to the active speakers SRS-Z1000 (not supplied), etc., to enjoy powerful MD playback at your desktop.

7. EXPLODED VIEWS

7-1. 7-2. 7-3. 7-4. 7-5. Panel Section 85 Main Board Section 86 MD Mechanism Section (MT-MZR50-143) 87 Cabinet Section 88 Shassis Section (MZS-R5ST) 89
8. ELECTRICAL PARTS LIST 90

Front panel of the Station

9 ! ! ! !

ERASE/DELETE button MODE button MOVE/INSERT button DISPLAY button PUSH OPEN button Display window ( (play) button OPENRELEASE switch p (stop) button POWER switch ACTIVE SP LEVEL /+ buttons 2 HEADPHONES jack for stereo plug LEVEL dial Adjusts the volume of headphones connected to the 2 HEADPHONES jack on the station, not the recorder.
! ! ! ! ! ! @ @ @ @ @ @ @ @ @ @ #
TIMER switch = (rewind/AMS) button + (fast forward/AMS) button TRACK MARK button UNDO button INPUT POSITIONN / n (position) buttons Cursor buttons TITLE/ENTER button SELECT button CAPS button END SEARCH button TIME MACHINE REC button P (pause) button REC switch REC LEVEL (ANALOG) control INPUT switch SYNCHRO REC switch
Back panel of the Station
1 OPEN (open the lid) switch 2 CHARGE lamp Lights up while charging the rechargeable battery on the station. 3 Rechargeable battery compartment 4 ACTIVE SP OUT jack 5 DC IN 9V jack 6 CLOCK SET button 7 DIGITAL OUT (OPTICAL) jack 8 DIGITAL IN (OPT1, OPT2) jack 9 LINE (ANALOG) OUT jack ! LINE (ANALOG) IN jack
The display window of the Station
1 Character information display Displays the disc and track names*, date, error messages, track numbers, etc. *Disc and track names appear only with MDs that have been electronically labeled. 2 MONO (monaural) indication 3 Battery indication Shows battery condition. Lights up when a rechargeable battery is inserted. While charging the rechargeable battery, this indication shows the charging condition. 4 Disc indication Shows that the disc is rotating for recording, playing or editing an MD. 5 SYNC (synchronized recording) indication Lights up while synchro-recording. 6 Play mode indication Shows the play mode of the MD. REPEAT (all repeat): All tracks play repeatedly. REPEAT1 (single repeat): One track plays repeatedly. REPEAT SHUFFLE (shuffle repeat): Tracks will be repeated in random order. PROGRAM (program play): Lights up when programming for program play or executing program play.
7 REC (record) indication Lights up while recording. When flashing, the recorder is in record standby mode. 8 Music calendar Displays the number of tracks recorded in MD, remaining tracks during shuffle play. 9 Position pointer Shows the current location on the MD. The point under recording or playing flashes. The recorded position lights up. ! Peak level meter Shows the volume of the MD being played or recorded.
The headphones with a remote control
1 Headphones Can be replaced with optional headphones. 2 Stereo mini plug 3 p (stop) button 4 Control To play, turn to ( + during stop. Turn to ( + during play to search the beginning of the succeeding track; hold in this position to fast-forward. Turn to = during play to search the beginning of the preceeding track; hold in this position to rewind. 5 HOLD switch Slide to lock the controls of the remote control. 6 P (pause) button 7 PLAY MODE button 8 DISPLAY button 9 VOL (volume) /+ buttons ! TRACK MARK button ! Display window

REC DRIVE IC506

A MUTE

2.8V A

SHOCK PROOF MEMORY CONTROLLER

Q505 (1/2) VC IC702 1

Q505 (2/2)

100 58

EFM/ACIRC ENCODER/DECODER

ATRAC ENCODER/DECODER

FILTER

DIGITAL AUDIO INTERFACE

J302 HP AMP IC13 HEADPHONES R-CH

AUDIO I/F

OPTICAL PICK-UP BLOCK (KMS-280A/J2N)

I J I J

ASYO ASYI RFI
2 X501 22.5MHz 1 BCK LRCK FS256
RF AMP, FOCUS/TRACKING ERROR AMP IC501

26 ADC

65-TO-1

RVCC DATA KEY2 Q313

RF AMP

RF AGC EQ

COMPARATOR

SAMPLING RATE CONVERTER

OSCI OSCO

CLOCK DIVIDER

CONTROL I/F
DETECTOR F C B D A E C D E F
PEAK & BOTTOM B J A A B C D I-V AMP 3T ABCD AMP WBL B.P.F

PEAK BOTM

PEAK BOTM CLOCK GENERATOR

XBCK LRCK FS256 TX

ANALOG MUX

SUBCODE PROCESSOR

SQSY DQSY

FOCUS ERROR AMP

FE MNT0 MNT1

I-V AMP 3T AT AMP B.P.F

TRACKING ERROR AMP

MONITOR CONTROL

HF MODULE

ADFG 32

ADIP DEMODULATOR/ DECODER CPU INTERFACE

SWDT SCLK XLAT SRDT SENS

9 4M DRAM IC509 47. 46. 48. 49 1. 2 DQ1. 18 DQ3. 15 A0 A3 A4 A8 IC505 +B IC506 +B LI + Q504 SWITCH 2.8V A 2.8V DC/DC CONV. IC3 UNREG 5V Q804,805 REG Q803
+B SWITCH ICND1 NS8 ND2 NSNSNSNGNGAM3+ Q901 RECHAREABLE BATTERY (NI-MH) BP-DM20 OR DRY BATTERY SIZE "AA" (IEC DESIGNATION R6) 2PCS,3V
Q502 ILCC LD LASER ON DIODE PD PD 10 PD LD/PD AMP SERIAL/ PARALLEL CONVERTER DECODER SWDT SCLK XLAT DTRF CKRF XLRF AUTO SEQUENCER A/D CONVERTER AUTOMATIC POWER CONTROL 11 APC 00X WBL 3T EQ V-I CONVERTER FOCNT FOCNT SPINDLE SERVO

ATRAC MEMORY CONTROL

APC REF

COMMAND

RV801 D/D 2.8V

XSTBY 19

12 2.8V 83 VC FCS+ Q503 (1/2) Q503 (2/2)
SERVO DIGITAL SIGNAL PROCESSOR

AUTOMATIC POWER CONTROL

K VCC VC
LI+ RECHAREABLE BATTERY (LITHIUM ION) LIP-8 3.7V

APCREF

PWM GENERATOR
AXWE 45 XRAS 44 XCAS 42 XOE FS4

5 AWE 4 RAS 17 CAS 16 OE

FOCUS COIL 2-AXIS DEVICE TRACKING COIL
FCS TRK+ TRK FOCUS/TRACKING COIL DRIVE SLED/SPINDOLE MOTOR DRIVE, IC505 FCS+ FCS TRK+ TRK FFDR FRDR TFDR TRDR 3 SFDR SDDR SPFD

WR PWR

RST 10
UNREG NV RAM IC807 IC510 MODULE 4 DET 2.8V SK 2 XSTATION LCD1 LC UNIT
FOCUS COIL DRIVE TRACKING COIL DRIVE SLED MOTOR DRIVE SPINDLE MOTOR DRIVE
DO 4 DI 3 CS 1 MICON +B Q801(1/2) 17 SEGSD 8 SCK 7 VDD LCD DRIVER IC37 SEGCOMCOM3

UNREG MNT

BATT ON

P CONT

XSHOCK

MIC DET

EVR CS

EVR DATA

LI MNT

U V W COM

DRIVER

Q22 SLP SW

3 WR PWR 35 RF SW CLOCK DET XPS 2 XRST
LCD ON 36 LCD CS 100 LCD CD 19 XLCD RST XCS 11 C/D 16 XRESET REG/RESET IC802 RVCC MICON +B 5 V OUT 4 VD IN 3 V OUT
SYSTEM CONTROL IC801 UNREG 5V

M901 SPINDLE MOTOR

SPINDLE MOTOR IC701

M902 SLED M MOTOR

6 LD ON

LX 8 D808 VDD 6

Signal path. : PB : REC

PROTECT

REC LED

PACK IN

CL SDIO

REFLCT

KEY ON

CL SCK

INT SW

13 D804 S901-908

H BRIGE

X801 12MHz

ICRVCC S701 S702 S703 S704 MEDIA PROTECT REFLECT INTIAL S705 INLIMIT S809 S817 CLOCK SET OPEN 1 S823 OPEN 2 S818 HOLD S811 AVLS 0 S810 DBB TEMP METER 1 3

61 FG IN

M RST 38

5 M903 STEPPING MOTOR

2 ST 1A ST 2A ST 1B ST 2B 15

REAL TIME CLOCK IC2

FUNCTION KEY
: PB (DIGITAL OUT) : REC (DIGITAL IN)
STEPPING MOTOR DRIVE IC702
MICON +B S808 REC S806,809,810 KEY ON SWITCH S803 T MARK S802 END S S801 PAUSE

X802 32kHz

: MIC R-channel is omitted.

BLOCK DIAGRAM MZS-R5ST

RV301 REC J303 LINE IN ANALOG L R R-CH IC315 A/D DIF BUFFER IC101 SWD 5V ICVCC 1 V IN 3 GND J304 SWD 5V OPT1/2 CONV. IC14 A/B SDT IN SDT OUT LEVEL CONV. 5V 3V IC313(1/2) 1 IC309 VCC 1 OPTICAL DIGITAL IN2 V OUT 3 GND D IN D OUT DA DATA LRCK XBCK 256FS XSTATION 9 REG IC314 G 6,A OUT R A OUT L A MUTE

OPTICAL DIGITAL OUT

A/D,D/A CONV. IC301 LEVEL CONV. 5V 3V ICA IN L A OUT L A IN L + Q303,304 MUTE CONYROL LINE AMP IC302 RV302 Q104 HP AMP IC305

LINE OUT L

IC308 VCC 1 OPTICAL DIGITAL IN1 V OUT 3 GND 2

J302 HEADPHONES

11 LRCK 7 H0 DATA 12 D 13 CLK 3 CS

EVR IC304 W0 9

SP AMP IC317 Q103 AV 5V VCC 14

J301 ACTIVE SPEAKER

12 SCLK REG 5V
SCK CS Q316 DEMO0 PW DA PW AD DIF1

LICREG 5

15 MCLK DIF0

Q302 MUTE CONYROL

TO MAIN SECTION 11

SWD 5V

5 IC313 (2/2)
QDIF AMP IC2 IC5 IC6 D903 D301 DIC906 BACK-UP REG REG 5V D902 UNREG 5V

AC DET IC3

THP901

J901 DC IN 9V

Q907,908 5V REG
SDI0 SDO0 SCK0 SCS0 Q902 (1/2)

NiCd BATTERY

CHARGE CONTROL IC901
Q905,906 SWD 5V POWER CONTROL 4

1 POWER CONTROL IC2

UNREG 5V LI + Q902 (2/2) 7 Q901,903 SWITCHING LI 5 CHARGE 4 IC902 Q904 Q919 Q919 Q918 Q918 Q920 (1/2) (2/2) (1/2) (2/2) IR RECEIVER ICD910 MICON +B 5 MICON +B /RESET ICS954 SYSTEM CONTROL IC907 RESET AC 44 XLI ON 23 MOTOR CONT PANEL DOWN POWER KEY CLOCK KEY XRELEASE P CONT 7 LCD SCK LCD STB LCD ON BL ON S951 LI ON Q924 LED DRIVER D906 D904 CHARGE AV -5V AV +5V T901

DIGITAL SERVO ENC/DEC & ATRAC MEMORY CONTROLER
DVSS 40 IC509 MSM51V4400-70TS-K NC 39 AO8 AO7 AO6 AO5 AO4 38

0.1 0.1(0.2)

1 DQ1 GND 20
E A D B VC VCC VEE F C J I

0.1(0.7)

DQ2 WE RAS A9 A0 A1 A2 A3 VCC

1.6(0)

ADIN ADFM SE CSLED TE

F 28 10

SP543 SE AP5980 TE TP5980 TE

2.6(2.8) 0.3 1.5

R549 100k 91 92

2.8(2.5)

2.5(0)

DQDQCAS 17

2.8 2.6 0.1 2.7(0.1)

0.9(0.7)

34 NC 33 AO0 AO1 AO2 AO3 32

0.1 2.7

1.4(0)
PD APC 20 F0CONT APCREF 15 TEMPR 14 TEMPXSTBY 16 SWDT 17 SCLK 18 XLAT GND 27 26

OE 16 A8 A7 A6 15

2.9(2.7) 0.1(0.3)
EQADJ 23 3TADJ 21 VREF R509 470K C511 2200p B

2.8(1.0)

WBLADJ VCC

0.1(0.9)

97 TESTTEST3 DVSS WRPWR EFMO DQSY SWDT SQSY SENS SRDT MNT0 MNT1 MNT2 MNT3 XRST SCLK XLAT OSCO 29

2.8(1.7) 2.8(2.3) 2.8

1.7(2.5)
ALRCK RVDD RVSS DOUT ADDT DADT XTSL DIN

2.4(2.7)

DVDD 28

2.8 2.8 2.8

R512 2.2K

R502 15k

R501 15k
0.4 1.2 0.2.7 (0.3) (0.7)
R513 68k FS256 ABCK 27 26

R554 1k

0.01 B

R566 47k

1.2(1.9) 2.6(2.6)

Q502 XN4404-TX 2

C512 0.01 B

R545 100k

SP558 ADDT

C524 0.1F

1 C6.3V

R507 10K

2.8 (2.8)

2.7 (2.8)

2.0 (2.8)

SP559 DADT

22.5MHz

R508 470

C522 0.01 B

R564 68k

R563 10k AP501 2.8V
2.5 2.7 2.9 0.4 2.0 2.9 2.8 (2.0) (1.8)

0.1 1.4 0.8 0.8 1.4 (0)

R555 *

1 AP574

2.3(2.8)

2.8(0)

R511 2.2K

1.2 (2.7)

C544 0.1 B

R565 100k C521 0.033

AP502GND

C526 0.1 F C6.3V Lu H

R517 33

Waveform

IC510 VOUT

TP500 R506 150

1.1Vp-p

BATT DET

PST9330

IC501 #

C541 15p CH

0.7(0.1) 0(0)

R520 47k 6 3

C542 15p CH

1.4(1.3) 0(0)

FB504 R571

4 Q503 UMH2

INVERTER

C576 0.01 B

5 R581 47k VCC 4

IC501 @
Lu H CN502 22P/TO C552 3.3 16V C551 3.3 16V Lu H

C10V 5 VCC

REFLECT {1} FGIN {1} INLS {1} L512-1 {1} L512-2 {1} TCOUNT {1} LDON {1} XLAT {1} DQSY {1} SDI1 {1} SDO1 {1} SCK1 {1} SQSY {1}

THERMAL SENSOR

IC803 XC31PNS01AMR
POWER BOARD CN805 (Page 73)

MAIN BOARD (1/3,3/3)

XRST {1,2} WRPWR {1} TX {1} SENSE {1}

XSHOCK {1}

MODE2 {1} MODE1 {1} +12V {1} ST256FS {1}
MODE2 MODE1 +12V ST256FS ADDATA SDTI DOUT DIN ABCK ALRCK
MAIN BOARD (1/3,3/3) MAIN BOARD (1/3) MAIN BOARD (1/3,3/3) MAIN BOARD (1/3) MAIN BOARD (1/3,3/3)
ADDATA {1} SDTI {1,2} DOUT {1} DIN {1} ABCK {1,2} ALRCK {1,2} ST1B {1} ST2B {1} UNREQ {1} 2.8V {1} UGND {1} DGND {1,2}
<UMREG> <2.8V>
SP60 LIP_MNT 3 RB808 100k

ST1B ST2B

R828 470k 0.50%

SDO0 SDI0

TP8201 TP8202 TP8203 TP8204
CN802 22P/STATION 11 SDO0 SDI0 SCK0 CS0 ST256FS ADDATA DADATA DOUT DIN AGND AGND AOUTL AOUTR UGND UGND AMUTE LRCK XBCK REG5V REG5V XSTATION Li+

SCK0 R829 150k 0.50%

<U-GND>

ST256FS ADDATA LH

TP8205 TP8206 TP8207 TP8208 TP8209 TP8210
D808 HRU0302A C10V TP908 DGND

SDTI DOUT DIN

XMICDET
<MICON+B> <2.8V> RB802 330k <D-GND>
STATION CN BOARD CN657 (Page 67)
AOUTL R824 47k 0.50% EXT 7 VDD 6 VOUT 5 R822 47k 0.50% R820 47k 0.50% KEY3 KEY0 KEY1 R821 47k C821 0.50% 100p CH C824 C822 C834 0.1 100p 100p F CH CH 2.9 2.9 2.9 2.9 1.2.9 2.9 R868 100k S809 CLOCK SET AVSS 50 KEY_R 49 NC 48 NC 47 NC 46 SCKSDOSDICS2.9 0.2.0 12MHz C816 0.1 F 2.9(0) 0 2.3 2.2 0(2.7) 0.1(1.6) 8.7 D803 CL270HR 0.1 0.2.8 D803 REC R857 10k RB805 330K C812 0.01 B 2.Q801 2.8 UMD2 SWITCH 5 TP826 LED RFSW MODE1 MODE2 R867 4.7k 2.TP805 DGND X801 C814 0.01B TP82 TP83 X802 32KHz 0 2.8 0.4 0.4 V2 X1 X2 GND IC804 DS1302 V1 SCK DATA CS ML621 CR886 6.8K 0.50% C813 0.01 TP828 CLOCK D806 MA728 RTAP804 BACK_UP 2.2.0 TEMP AVDD AVREF TP827 REC S808 REC C8291 B 2.9 R825 330k R830 330k C6.3V TP830 MICOM+B 8 LX AOUTR

TP8212 TP8213 TP8215

C815 0.01 B

C820 0.01 B

R803 1M

R831 1M

IC802 RS5RJ29261
TP8216 ALRCK ABCK TP8217 TP8218 TP8220

R806 1M

RTP8168 TP8165

2.9 2.9 TP8221 TP8222

4 VDIN

2.6(2.1)

MAIN BOARD (3/3) MAIN BOARD (1/3,3/3)

AOUTL {2} AOUTR {2}

1.3(0.9)

DQSY 0 0

R856 1k 0 2.9 2.8

0(2.8)

0.1 2.7 2.7 2.7 1.4
51 INTSW DBB2 DQSY DBB1 KEY1 PACKIN KEY0 KEY2 LIMNT(LI+MNT) UNREG_MNT MICDET KEYON KEY3 ST2A ST1A XLAT FGIN AM3 NC NC

TCOUNT SDI1 SDO1

0 0.6 2.6(2.2) 2.7 2.79 SDI1

76 TCOUNT

SDO1 SCK1
DGND {1,2} AUGND {2} RGND {2} 2.8VA {2} CDTO {2}

SCK1 SQSY

80 SQSY 81 BEEP

0 R861 1M

0 0.1 2.9

1.8 1.9 1.R883

2.9 2.9 0.3 1.8 2.9 1.5

S16 S17

R894 1k

R882 100k

R834 1M XLCDRST

R884 100k

C8180.1F

Q809 2SK2034

R893 1k

S18 S19 S20

C862 0.01 B

Q806,809,810 KEY ON SWITCH LCD_CS LCD_CD
Note: All capacitors are in F unless otherwise noted. pF: F 50 WV or less are not indicated except for electrolytics and tantalums. All resistors are in and 1/4 W or less unless otherwise specified. : internal component. C : panel designation. A : B+ Line. Power voltage is dc 4.5 V and fed with regulated dc power supply from battery terminal. Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : PB ( ) : REC Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances. Waveforms are taken with a oscilloscope. Voltage variations may be noted due to normal production tolerances. Circled numbers refer to waveforms. Signal path. E : PB a : REC
6-9. SCHEMATIC DIAGRAM MD MAIN SECTION (3/3)

5 IC301 RN5RZ25A

GND XCE

Ref. No.

Q301 DTA144EUA SWITCH C6.3V C6.3V

JEW 0 1000p (B)

AEP/UK FB (HM102) FB (HM102) FB (HM102) 0.1 (B)

FB302 FB303

C304 1000p B 20 S301 MIC-SENS HIGH 0

FB304 C306

C117 4.7 C218 0.1 C217 4.7

C118 0.1

LOW R205 22k C6.3V

F 6.3v

MUTE CONTROL

IC306 PST9322

C261 680p B C220 0.47 B 2.7 CB 1.1(1.3) R136 4.7k 0.50% CB R236 4.7k 0.50%

R101 6.8k 0.50%

C205 150p CH

R2016.8k 0.50%

0(0.4)

R207 33k0.50% 0

CR208 6.3V 680 0.50%
SENS SWITCH C120 0.47 B 1.3 1.2 (1.3)

AUDIO GAIN CONTROL

IC305 DS1801E

HP.AMP

IC805 LA4800V-TLM 2.8 C399 0.68 10V R374 100k

1.2(0.4)

MICIN-DET MIC-L MIC-R

C204 1000P B

TLV2362IPW

1.3(0.1)

R203 6.8k 0.50%

1.3 2.7 C161 680p B

VMCR NC PGAR ADCR NC

TP3012 TP3013 TP3014

FB305 0

C201 2200p B

VCC 14

CLK 13

DIN 12

AGND 11

C104 1000P B

4 ZCEN

1.3(0.6) 1.3(0.6)

TP3011 MIC-GND

C101 2200p B

43 RINLIN1

VD 18 DGND 17 CDTI
7 1.1 C293 2.4 3.3 C292 6.3v 4.7 6.3V 8

VREFC RFOUT

RFC BEEP

C296 0.1 B

FB350 0

R107 33k 0.50% C6.3V

R103 6.8k 0.50% 0

42 TST1

IC303 AK4515-VQ

R219 2.2

C224 0.22F

R381 100

R0.50%

TP9018

TP9019

TP9021

TP9022

TP9023

TP9025

TP9027

TP9028

TP9030

TP9031

EL901 CN952 16PIN

TP9080

R967 6.8K

C952 0.047 (B)

TP9103
Note: All capacitors are in F unless otherwise noted. pF: F 50 WV or less are not indicated except for electrolytics and tantalums. All resistors are in and 1/4 W or less unless otherwise specified. : internal component. C : panel designation. Note: The components identified by mark ! or dotted line with mark ! are critical for safety. Replace only with part number specified. A : B+ Line. B : B Line. Power voltage is dc 4.5 V and fed with regulated dc power supply from battery terminal. Voltages and waveforms are dc with respect to ground under no-signal (detuned) conditions. no mark : PB ( ) : REC Voltages are taken with a VOM (Input impedance 10 M). Voltage variations may be noted due to normal production tolerances. Waveforms are taken with a oscilloscope. Voltage variations may be noted due to normal production tolerances. Circled numbers refer to waveforms. Signal path. E : PB a : REC

OPTICAL

5.0 DIN 0.1.5(0) ADDATA R0.8(0)

1OE 1A 1Y 2OE 2A 2Y GND

VCC 14 4OE 13 4A 12 4Y 11 3OE 10 3A 3Y 9 8
2 OUTIN GND 2.C320 2.2 (F)2012

ESCK ECS EDATA

R934 10K

66 ECS

DIGIAL OUT

TP9087

Q916 DTC114EUT106 SWITCH

UMD3-TR SWITCH

R959 @0 SWD5V 8 RB901 100K 3 R989 330K C933 C935 10/16V 10/16V LH C934 0.1 (B) 0 R943 1K PANEL DOWN R988 330K KEY2 KEY4 KEY1 GND U902 TEST 0 R945 1K 5.1 C936 0.1 (B) 2.7 2
IC313 SN74LVC125APW-E20 RC953 6.9F/10V
CN953 6PIN 5 MOTOR1 MOTOR2 GND XLOCK GND XINT

C954 330/6.3V

0.2 4.6 Q917 2SC3739-T1B13B14 EL DRIVE
CN656 6PIN MOTOR1 MOTOR2 GND XLOCK GND XINT 5 6
TP9033 TP9034 TP9035 TP9036
TP601 TP602 TP603 TP604 TP605 (XLOCK) S655

TP607 TP608

LINE/OPT2

LINE/OPT1

TIMER2

TIMER1

R987 330K R986 330K Q913 2SC3739-T1B13B14 ARM MOTOR CONT

6-13. PRINTED WIRING BOARD STATION CONTROL SECTION

(COMPONENT SIDE)

DISPLAY

TRACK MARK

1-667-231-

TP650 TP651

RADIAL BOARD CN951 (Page 59)
UNDO MOVE/INSERT ERASE/DELETE

LCD901 LCD MODULE

CN604 CN605

INPUT POSITION

RADIAL BOARD CN952 (Page 61)
RADIAL BOARD CN954 (Page 59)

11 1-667 -220(11)

R624 R623 R622
MAIN BOARD CN802 (Page 47)

R621 R620

SELECT

TITLE/ENTER

1-667-23122 1

11 (11) 11 1-667-233(11)

TIME MACHINE REC PUSH OPEN END SEARCH
ACYIVE SP LEVEL S613 TIMER REC-OFF-PLAY S614 SINCHRO REC OFF-ON S612 INPUT ANALOG-OPT1-OPT2

1-667-234-

Note: X : parts extracted from the component side. b : Pattern from the side which enables seeing. (The other layers' patterns are not indicated.) Caution: Pattern face side: (Conductor Side) Parts face side: (Component Side)
6-14. PRINTED WIRING BOARD MD POWER SUPPLY, SWITCH SECTION

SW BOARD

S803 TRACK MARK S802 END SEARCH S801

SW UNIT

VOLUME MODE DISP
MAIN BOARD CN803 (Page 47)
S907 S906 S905 S904 S903 S902

(11) 1-667-219-

1-667-219- (11)

POWER BOARD

RECHAGEABLE BATTERY (NI-MH) BP-DM20 PR DRY BATTERY SIZE "AA" (IEC DESIGNATION R6) 2PCS 3V
MAIN BOARD CN801 (Page 48)
RECHAGEABLE BATTERY (LITUM ION) LIP-8 3.7V
Ref. No. D801 D810 Location C-2 D-2 D-2 C-2 D-2 E-2 E-2 C-2
11 (11) 1-667-2181-667-218-
IC806 IC808 Q803 Q804 Q805 Q901
6-15. SCHEMATIC DIAGRAM MD POWER SUPPLY, SWITCH SECTION
TP834 LI+ L805 L804 10u H 10u H Q804 C805 2SB1302-T 100p CH POWER 2.8 R814 33k 0.50% R4.5 3.8 C841 1B L802 33u H 4.5 4.5 4.5 8.7

TP806 LI+

R801 2.2

+B SWITSH

TP807 LI-
RECHARGEABLE BATTERY (LITIUM ION) LIP-8 3.7V
R812 2.2k C810 RV801 4.7 F 4.7k DD 2.8V C6.3V C807 1500p B C860 0.022

Q803 2SD1623T SWITCH B 0

C801 4.7 F

0 TP835 LI-

7-2. MAIN BOARD SECTION

Ref. No. * 61 Part No. A-3293-769-A 3-335-797-91 4-995-436-01 X-4949-155-1 4-995-437-01 X-4949-154-1 4-995-402-01 1-475-368-11 4-995-435-01 3-349-825-51 Description MAIN BOARD ASSY SCREW (M1.4), TOOTHED LOCK SCREW (HP), STEP BELT ASSY, ORNAMENTAL SCREW (DAMPER) CHASSIS (MAIN ST) ASSY SPRING (LOCK), TENSION SW UNIT DAMPER (R50) SCREW
Ref. No. Part No. A-3293-770-A 1-782-708-11 X-4949-116-1 4-963-883-61 4-995-432-01 4-995-722-01 4-998-405-01 4-998-407-01 4-998-844-01 4-998-406-01 Description POWER BOARD ASSY WIRE (FLAT TYPE) (20 CORE) CASE ASSY, BATTERY SCREW (M1.4), PRECISION PAN HINGE, BATTERY LID, BATTERY CASE SHEET (CLV) HIMERON TAPE (DAMPER) SHEET (SW) SHEET (LCD) Remarks

1-667-219-11 SW BOARD

7-3. MD MECHANISM SECTION (MT-MZR50-143)

105 104

135 136

101 102

117 119

120 121

Ref. No. 111 * 116 ! 119 120
Part No. 1-667-210-11 4-963-883-01 A-3293-756-A 1-667-690-11 3-338-645-31 X-4949-129-1 3-349-825-41 A-3293-755-A 4-995-575-01 4-995-573-01 3-704-246-13 4-995-568-01 4-995-572-01 4-955-841-01 4-995-570-01 4-995-567-01 X-4949-256-1 4-995-578-01 X-4949-131-1 4-995-571-01
Description MD FLEXIBLE BOARD SCREW (M1.4), PRECISION PAN CLV BOARD, COMPLETE CLV FLEXIBLE BOARD WASHER (0.8-2.5) HOLDER ASSY SCREW REC BOARD, COMPLETE SHEET, INSULATING SPRING, TENSION SCREW (P1.4X2.0) GUIDE, HOLDER SHEET, BLIND SCREW SPRING, RACK

Ref. No. M901 M902 M903

Part No. 4-963-883-41 4-995-580-01 4-995-586-01 4-972-546-01 4-963-901-01 3-315-384-11 4-964-564-01 X-4949-127-1 X-4949-126-1 4-995-585-01 4-963-898-11 3-704-197-31 3-015-033-01 4-997-228-11 4-997-172-01 1-667-211-11 1-763-011-11 A-3311-972-A A-3320-037-A
SCREW (M1.4), PRECISION PAN SCREW, LEAD GEAR (SD) SPRING (WORM GEAR),COMPRESSION GEAR, WORM WASHER, STOPPER SCREW (M1.2X1.6) CHASSIS ASSY, GEAR CHASSIS ASSY SPRING (LIMITTER), TORSION GEAR (WORM WHEEL) SCREW (M1.4X3.0), LOCKING SCREW (DIA. 1.4X4), PRECISION SPACER (RACK SPRING) SCREW (M1.4X3) MOTOR FLEXIBLE BOARD MOTOR MOTOR BLOCK ASSY, SLED STEPPER BLOCK ASSY
SHAFT, MAIN OPTICAL PICK-UP ASSY (KMS-280A/JZN) GEAR (SC) BRACKET (S) ASSY SPRING, THRUST
7-4. CABINET SECTION (MZS-R5ST)

164 c b

169 171

0uH (AEP, UK) 0 5%

1-414-385-11 INDUCTOR < IC >

0uH (AEP, UK)

IC301 IC302 IC303 IC305 IC306 IC501 IC503 IC505 IC506 IC509 IC509 IC509 IC510 IC511 IC512
8-759-482-09 8-759-252-90 8-759-439-74 8-759-481-66 8-759-487-19

IC IC IC IC IC

RN5RZ25BA-TL TLV2362IPW-ELM1500 AK4515-VQ DS1801E-014TE2 PST9322UL
8-752-085-60 IC CXA2523AR-T4 8-752-384-47 IC CXD2652AR 8-759-460-34 IC MPC17A36VMEL 8-759-329-43 IC MPC18A20VM 8-759-334-38 IC MSM51V4400-70TS-K 8-759-349-44 8-759-334-38 8-759-487-20 8-759-196-97 8-759-271-86 IC IC IC IC IC MB81V4400C-60PFTN MSM51V4400-70TS-K PST9330UL TC7SH32FU-TE85R TC7SH04FU
R101 R103 R105 R107 R108 R119 R136 R137 R160 R161
1-218-867-11 1-218-867-11 1-216-837-11 1-218-883-11 1-218-843-11 1-216-789-11 1-218-863-11 1-216-827-11 1-216-857-11 1-218-847-11
RES, CHIP RES, CHIP METAL CHIP RES, CHIP RES, CHIP METAL CHIP RES, CHIP METAL CHIP METAL CHIP RES, CHIP
6.8K (1608) 6.8K (1608) 22K 5% 33K (1608) 680 (1608) 2.2 5% 4.7K (1608) 3.3K 5% 1M 5% 1.0K (1608)

1/16W 1/16W 1/16W

Ref. No. R201 R203 R205 R207 R208 R219 R236 R237 R260 R261 R306 R364 R365 R374 R380 R381 R382 R383 R501 R502 R503 R504 R505 R506 R507 R508 R509 R510 R511 R512 R513 R514 R515 R516 R517 R518 R520 R524 R525 R526 R528 R529 R530 R531 R536 R537 R538 R539 R540 R541 R542 R543 R545 R546 R549 Part No. 1-218-867-11 1-218-867-11 1-216-837-11 1-218-883-11 1-218-843-11 1-216-789-11 1-218-863-11 1-216-827-11 1-216-857-11 1-218-847-11 1-216-797-11 1-216-789-11 1-216-809-11 1-216-845-11 1-216-864-11 1-216-809-11 1-216-829-11 1-216-829-11 1-216-835-11 1-216-835-11 1-216-831-11 1-216-859-11 1-218-446-11 1-216-811-11 1-216-833-11 1-216-817-11 1-216-853-11 1-216-825-11 1-216-825-11 1-216-825-11 1-216-843-11 1-216-864-11 1-216-864-11 1-216-821-11 1-216-803-11 1-216-864-11 1-216-841-11 1-216-833-11 1-216-845-11 1-216-853-11 1-216-821-11 1-216-821-11 1-216-827-11 1-216-845-11 1-218-891-11 1-218-899-11 1-218-895-11 1-216-833-11 1-216-857-11 1-216-843-11 1-218-903-11 1-218-887-11 1-216-845-11 1-216-841-11 1-216-845-11 Description RES, CHIP RES, CHIP METAL CHIP RES, CHIP RES, CHIP METAL CHIP RES, CHIP METAL CHIP METAL CHIP RES, CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP RES, CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP RES, CHIP RES, CHIP RES, CHIP METAL CHIP METAL CHIP METAL CHIP RES, CHIP RES, CHIP METAL CHIP METAL CHIP METAL CHIP 6.8K (1608) 6.8K (1608) 22K 5% 33K (1608) 680 (1608) 2.2 5% 4.7K (1608) 3.3K 5% 1M 5% 1.0K (1608) 10 2.100K 4.7K 4.7K 15K 15K 5% 5% 5% 5% 5% 5% 5% 5% 5% 5% Remarks Ref. No. R554 R555 1/16W R555 R559 R562 R563 R564 R565 R566 R571 1-216-817-11 METAL CHIP 1-216-811-11 METAL CHIP 1-218-887-11 RES, CHIP 1-216-833-11 1-216-843-11 1-216-845-11 1-216-841-11 1-216-864-11 METAL CHIP METAL CHIP METAL CHIP METAL CHIP METAL CHIP 470 5% Part No. Description 1K 0 5% 5% Remarks 1/16W 1/16W (JEW) 1/16W (AEP,UK) 1/16W 1-216-821-11 METAL CHIP 1-216-864-11 METAL CHIP

************************************************************ A-3306-961-A RADIAL BOARD,COMPLETE ********************** 3-561-902-00 CLOTH, RETAINING, CASSETTE 4-984-015-01 TERMINAL, BATTERY 4-985-124-01 SPRING (POP UP ST), COIL 4-994-426-01 4-994-427-01 4-994-428-01 4-994-454-01 4-996-642-01 CASE, BU BATTERY SPRING, BATTERY COIL CASE, BATTERY TERMINAL (BU) SHEET, BLIND
1-126-157-11 ELECT 1-162-927-11 CERAMIC CHIP 1-162-927-11 CERAMIC CHIP 1-162-917-11 CERAMIC CHIP 1-162-970-11 CERAMIC CHIP 1-162-927-11 1-126-157-11 1-164-505-11 1-109-982-11 1-109-982-11 1-162-921-11 1-162-921-11 1-162-970-11 1-162-970-11 1-162-970-11 1-162-970-11 1-109-982-11 1-162-927-11 1-162-927-11 1-162-927-11 1-107-826-11 1-107-826-11 1-126-157-11 1-124-779-00 1-124-779-00 1-126-157-11 1-107-826-11 1-126-935-11 1-124-257-00 1-162-970-11 1-126-157-11 1-107-826-11 1-107-826-11 1-107-823-11 1-126-157-11 1-164-505-11 1-165-112-11 1-107-826-11 1-107-826-11 1-124-257-00 1-124-229-00 1-162-964-11 1-162-970-11 1-107-823-11 1-162-970-11 CERAMIC CHIP ELECT CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP ELECT ELECT CHIP ELECT CHIP ELECT CERAMIC CHIP ELECT ELECT CERAMIC CHIP ELECT CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP ELECT CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP ELECT ELECT CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP
7-685-104-19 SCREW +P 2X6 TYPE2 NON-SLIT < CAPACITOR > C103 C104 C105 C107 C108 C109 C111 C112 C114 C115 C116 C117 C118 C119 C124 C125 C126 C127 C128 C129 C130 C131 C132 C133 C134 C135 C136 C141 C180 C181 C182 C203 C204 C205 C207 C208 C209 C211 C214 C215 1-124-584-00 1-162-917-11 1-162-970-11 1-162-970-11 1-162-964-11 1-162-917-11 1-124-257-00 1-162-970-11 1-124-589-11 1-126-157-11 1-164-505-11 1-126-935-11 1-162-917-11 1-126-157-11 1-126-157-11 ELECT CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP CERAMIC CHIP ELECT CERAMIC CHIP ELECT ELECT CERAMIC CHIP ELECT CERAMIC CHIP ELECT ELECT 100uF 15PF 0.01uF 0.01uF 0.001uF 15PF 2.2uF 0.01uF 47uF 10uF 2.2uF 470uF 15PF 10uF 10uF 10uF 100PF 100PF 15PF 0.01uF 100PF 10uF 2.2uF 1uF 1uF 33PF 33PF 1uF 100PF 100PF 100PF 100uF 15PF 0.01uF 0.01uF 0.001uF 15PF 2.2uF 47uF 10uF 20% 5% 10% 10% 10% 5% 20% 10% 20% 20% 10V 50V 25V 25V 50V 50V 50V 25V 16V 16V 16V 6.3V 50V 16V 10V 10V 50V (AEP, UK) 50V 50V 25V 50V 16V 16V 10V 10V 50V 50V 10V 50V 50V 50V 10V 50V 25V 25V 50V 50V 50V 16V 16V

Part No.

ACCESSORIES & PACKING MATERIALS ******************************* 3-860-705-11 MANUAL, INSTRUCTION (ENGLISH, FRENCH, GERMAN, SPANISH) 3-860-705-21 MANUAL, INSTRUCTION (UK) (ENGLISH) 3-860-705-31 MANUAL, INSTRUCTION (AEP) (DUTCH, SWEDISH, FINNISH, ITALIAN, PORTUGUESE) 3-860-705-41 MANUAL, INSTRUCTION (JEW) (JAPANESE, CHINESE, KOREAN) X-3329-657-1 ATTACHMENT ASSY 1-475-375-21 1-475-455-11 1-475-751-11 1-569-007-11 1-696-212-21 1-759-277-21 1-770-019-12 3-704-275-01 4-972-888-01 8-917-614-90 REMOTE CONTROL UNIT (RM-MZR50) ADAPTOR, AC (AC-MZR5ST) (JEW) ADAPTOR, AC (AC220-230V) (AEP, UK) ADAPTOR, CONVERSION 2P (JEW) CORD (WITH CONNECTOR) (AEP, UK) CASE, BATTERY (EBP-MZR4) ADAPTOR, CONVERSION PLUG 3P (UK) BAG (STANDARD), PROTECTION CASE, CARRYING REMOTE COMMANDER RMT-CR5ST SET
8-953-218-90 HEADPHONE MDR-E838SP//K SET ************************************************************ ************** HARDWARE LIST ************** #1 #2 #3 #4 7-685-104-11 7-685-135-14 7-627-554-07 7-685-105-14 SCREW +P TYPE2 NON-SLIT SCREW +P 2.TYPE2 NON-SLIT SCREW,PRECISION +P 2 2.2 SCREW,PRECISION +P TYPE2 NON-SLIT

Sony Corporation

9-923-279-12
Audio Entertainment Group
98D167550-1 Printed in Hungary 1998.4 Published by General Engineering Dept.

RV301 REC J303 LINE IN ANALOG L R R-CH IC315 A/D DIF BUFFER IC101 SWD 5V ICVCC 1 V IN 3 GND J304 SWD 5V OPT1/2 CONV. IC14 A/B SDT IN SDT OUT LEVEL CONV. 3V 5V IC313(1/2) 1 IC309 VCC 1 OPTICAL DIGITAL IN2 V OUT 3 GND D IN D OUT DA DATA LRCK XBCK 256FS XSTATION 9 REG IC314 G 6,A OUT R A OUT L A MUTE SDI0 SDO0 SCK0 SCS5 DIF AMP IC2 IC5 IC6 D903 D301

OPTICAL DIGITAL OUT

A/D,D/A CONV. IC301 LEVEL CONV. 5V 3V ICA IN L A OUT L A IN L + Q303,304 MUTE CONYROL LINE AMP IC302 RV302 Q104 HP AMP IC305

LINE OUT L

IC308 VCC 1 OPTICAL DIGITAL IN1 V OUT 3 GND 2

J302 HEADPHONES

11 LRCK 7 H0 DATA 12 D 13 CLK 3 CS

EVR IC304 W0 9

SP AMP IC317 Q103 AV 5V VCC 14

J301 ACTIVE SPEAKER

12 SCLK REG 5V

SCK CS Q316

DEMO0 PW DA PW AD

LICREG 5

15 MCLK 2

DIF0 DIF1

Q302 MUTE CONYROL

TO MAIN SECTION 11

SWD 5V

2 IC313 (2/2)

QUNREG 5V

AD DATA

AC DET IC3

THP901

J901 DC IN 9V

IC906 D909 BACK-UP REG 1

UNREG 5V LI +

X901 10MHz

SCS0 SCK0 SDI0 SDO0

Q914 MOTOR DRIVE

MOTOR CONT CLOCK KEY XRELEASE XCLOCK

OPE EN XINIT

BUF EN OPT PANEL DOWN POWER KEY PLAY KEY

SYSTEM CONTROL IC907

REC KEY

SCK DATA SC

REG 5V D902

Q907,908 5V REG

NiCd BATTERY

Q902 (1/2)

CHARGE CONTROL IC901
Q905,906 SWD 5V POWER CONTROL 4

1 POWER CONTROL IC2

Q902 (2/2)
7 Q901,903 SWITCHING LI 5 CHARGE 4 IC902 Q904 LED DRIVER IR RECEIVER ICD910 MICON +B 5 MICON +B /RESET ICS954 RESET Q4 D906 D904 CHARGE AV -5V AV +5V T901

Q910 AU 5V REG

Q919 Q919 Q918 Q918 Q920 (1/2) (2/2) (1/2) (2/2)
2 Q909 QPOWER CONTROL IC905

DE EMP

P MUTE

ESCK ESC EDATA

LI CHG AC IN LI ON STLI ON LI + MNT CHARGE LED RMC

RST 30

Output Jack For Active Speakers
Differences of functions between the 4th generation MiniDisc recorder (MZ-R30) and MZ-R5ST are shown below.
Table 2-1 Comparison of functions between the 4th generation MiniDisc recorder (MZ-R30) and MZ-R5ST Functions of MiniDisc recorder Headphones output LINE output Digital output Active speaker output LINE input Digital input Microphone input AVLS DBB (Digital Bass Boost) RESUME BEEP Monaural recording Monaural playback Automatic track mark Character input Sampling rate converter 20-bit wide bit stream Synchro-recording Time Machine recording Timer standby function Program playback Rehearsal function Undo function
Note : The mark in the table indicates the new functions.
MZ-R5ST g MiniDisc recorder Station side MiniDisc recorder Station side :G :g :G :

MZ-R30 g g G G

MiniDisc recorder : G Station side :g MiniDisc recorder : G Station side : (2 inputs) MiniDisc recorder : g (External stereo) Station side :G g g g (Always ON) g g g g g MiniDisc recorder : g Station side :G
g g (1 input) g (External stereo) g g g (Always ON) g g g g g g G g G
3. CIRCUIT THEORY OF MZ-R5ST STATION
3-1. System Configuration
(2) System Configuration of Station (MZS-R5ST). (1) System Configuration of MiniDisc Recorder (MZ-R5ST). Fig. 3-2 shows system configuration (MZS-R5ST). Station (MZS-R5ST) is described briefly as follows. Fig. 3-1 shows system configuration (MZ-R5ST). MiniDisc recorder (MZ-R5ST) is described briefly as follows. First, the flow of signals during recording is described. The MIC IN signal that is passed through the microphone amplifier IC302 inputs the AD/DA converter IC303 where the microphone signal is converted to the 16-bit digital data by a built-in A/D converter. The digital signal is sent to the DSP IC503 via the OR gate IC511. During LINE recording , the 20-bit digital data that is A/D converted by the station (MZSR5ST) (refer to the next section of this manual (2) System Configuration of Station (MZS-R5ST) for more details), is input to the DSP IC503 via the OR gate IC511. The other input that is the DIGITAL IN input signal, is input directly to the DSP IC503. At IC503, signal processing (compression, interleaving, EFM modulation, etc.) is performed on the input digital data to generate the EFM signal. The EFM signal thus generated is recorded on the MO disc via the REC DRIVE IC506. Next, the flow of signals during playback is described. The EFM signal that is read by the optical pickup is input to the DSP IC503 via the RF amplifier IC501. At IC503, signal processing ( EFM demodulation, de-interleaving, expansion, etc.) is performed on the input EFM signal to generate the DA data. When the MiniDisc recorder (MZ-R5ST) is used as a stand-alone unit, the DA data is sent to the AD/DA converter IC303 where the DA data is passed through the internal DBB (Digital Bass Boost) circuit, digital filter and is converted to the Lchannel and R-channel analog signal by D/A converter. The D/A converted L-channel and R-channel analog signal passes through the audio gain control IC305, headphones amplifier IC805 and then to HEADPHONES. When station unit is connected, the DA data is output to the AD/DA converter IC301 of the station connected. Next, the flow of the servo signals is described below. The error signals that are read by optical pickup are sent to the DSP IC503 after passing the various error amplifiers inside the RF amplifier IC501. In the DSP IC503, the input error signals are performed the servo calculations by the internal digital servo processor to generate the servo signal. The servo signals are then output and used to drive coils and motors via the coil/motor drive IC505. The system controller IC801 is described lastly. The system controller IC801 controls the whole system of the MZ-R5ST. The main control functions of the respective ICs and the input signals that are controlled by the system controller IC 801 are shown below. W Controls the DSP IC503 : Control of the respective servo processings. Selection of mode (recording or playback) of the respective signal processing blocks Control of input sound source (AD data or digital data), etc. W Controls the RF amplifier : Selection of mode (PIT or GROOVE) of the RF amplifier, etc. W Controls the audio gain control IC305 : Control of the output volume W Controls the AD/DA converter IC303 : Control of the DBB circuit, etc. W Controls the NV RAM IC807: Control of the E-F balance values during servo processing W Controls the stepping motor drive IC702 W Controls the REC DRIVE IC506 W Communication with the system controller IC907 of station unit W Controls the input signals from keys and switches W Controls temperature inside the MiniDisc recorder W Controls the clock information W Drives LCD First, the flow of signals during recording is described. When station (MZS-R5ST) is in the LINE recording mode, the L-channel and Rchannel analog signals that are input from the LINE IN JACK J303 are sent to the AD/DA converter IC301 via the LINE amplifier IC315, the differential buffers IC101 and IC201. The LINE input signal is converted to the 20-bit digital data by the A/D converter inside IC301. The 20-bit digital data is output to MiniDisc recorder (MZ-R5ST). The digital recording mode is described next. The station (MZS-R5ST) has the two channel digital inputs. The digital signal that is input from the DIGITAL IN is sent to the DIN selector IC311. The station (MZSR5ST) has the recording source selector switch. When operator operates the recording source selector switch, result of selection is input to the system controller IC907 so that IC907 recognizes the selected recording source and controls the selector switch inside the DIN selector IC311. Thus the digital data that is going to be output to MiniDisc recorder (MZ-R5ST), is determined. The digital data that is selected by the DIN selector IC311 is output to MiniDisc recorder (MZ-R5ST) via the level converter IC313. Next, the flow of signals during playback is described. The DA data that is output from the DSP IC503 of MiniDisc recorder (MZ-R5ST), is input to the AD/DA converter IC301 where the DA data is passed through the digital filter and is converted to the L-channel and R-channel analog signals by D/A converter. The D/A converted L-channel and R-channel analog signals are output to the LINE OUT jack J304 via the LINE amplifier IC302, output to the HEADPHONES OUT jack J302 via the LINE OUT amplifier IC302, PB VOLUME RV302 and headphones amplifier IC305. The D/A converted L-channel and R-channel analog signals are also output to the ACTIVE SPEAKER OUT jack J301 via the LINE OUT amplifier IC302 and buffer IC317, and is at the same time output to the AUDIO GAIN control IC305 of MiniDisc recorder (MZ-R5ST) via a differential amplifier. The system controller IC907 is described lastly. The system controller IC907 controls the whole system of MZS-R5ST. The main control functions of the respective ICs and the input signals that are controlled by the system controller IC907 are shown below. W Controls the DIN selector IC311 : Control of the digital data (DIN1 or DIN2) that is going to be output to MiniDisc recorder (MZ-R5ST) W Controls the level converter : Selection of POWER ON/OFF W Controls the EVR IC304 : Control of the output volume for active speakers W Controls the AD/DA converter IC301 : Control of ON/OFF of the A/D converter and D/A converter, etc. W Communication with the system controller IC801 of MiniDisc recorder (MZ-R5ST) W Controls the input signals from keys and switches W Drives LCD

Fig. 3-5 Timing chart when the POWER key S609 is pressed
(4) Generating the 2.9 V for the level converter IC313 The SWD 5 V is supplied to the 2.9 V REG IC314 pin3 [IN] to start up IC314. As IC314 is started up, the 2.9 V is generated by internal series regulator and is output from pin2 [OUT]. The 2.9 V is output to the level converter IC313 as its startup voltage.
(5) Generating the AUDIO 5 V Fig. 3-6 shows the waveform timing chart when generating the AUDIO 5 V. When the system controller IC907 is started with MiniDisc recorder connected to station, H signal is output from pin7 [PCONT]. Q911 (1/2) and (2/2) are turned ON by this H signal so that the 9 V that is input to the DC jack, is supplied to the POWER CONTROL2 IC905 pin2 [VCC] through the line filter LF902 and L904. When IC905 starts up, the PWM waveform that is internally generated by the built-in PWM comparator, is output from pin1 [OUT]. Q910 is started the switching operation by this PWM waveform, and the step-down DC-DC converter circuit is started up. Then output of Q910 (refer to 6 of Fig. 3-6) is input to T901 where its energy is converted (refer to 7 of Fig. 3-6), smoothed by T901 coil and C911 to generate +5 V (refer to 8 of Fig. 3-6). The +5 V is voltage-divided by the voltage-divider-resistor of R918 to R920, R955 and R922. Output voltage from the divider is fed back to IC905 pin4 [INPUT]. Based on this feedback voltage, IC905 controls the voltage by controlling the PWM waveform duty generated by the internal PWM comparator. The AUDIO +5 V is thus generated. The AUDIO +5 V is supplied to the AUDIO circuit via smoothing circuit of L902 and C906. (Refer to Fig. 3-9.) Output of Q910 (refer to 6 of Fig. 3-6) is smoothed out by D906 and a negative voltage power is generated. (Refer to 0 of Fig. 3-6.) The negative voltage power is removed of ripple by L901, C905 and C909, and the AUDIO 5 V (Refer to ! of Fig. 3-6.) is generated. (Refer to Fig. 3-9.)
Fig. 3-6 Waveform timing when generating the AUDIO 5 V
(6) Generating 2.5 V to be used inside EVR IC304 When the AUDIO +5 V is input to pin6[IN] of the 2.5 V REG. IC306. The 2.5V is generated by the internal series regulator. The 2.5 V is output from pin4 [OUT] and used as the internal power supply voltage of EVR IC304. (7) Operation of voltage detector IC910 Whether AC power is input to station or not, is detected at pin@ [ACIN] of the system controller IC907. (L: when AC power is connected. ) The voltage detector IC910 is installed in order to change the port input of pin@ [ACIN] earlier, when AC power cord is removed from station. When input to IC910 pin2 becomes lower than 4.5 V, FET inside IC910 is turned on so that L is output from pin1. Q921 is turned off by this L signal. And H is input to pin@ [ACIN] of system controller IC907.

Fig. 3-7 UNREG power supply voltage generator circuit waveform timing chart (when MiniDisc recorder is not connected to station)
Fig. 3-8 UNREG power supply voltage generator circuit waveform timing chart (when MiniDisc recorder is connected to station)
Fig. 3-9 AUDIO 5 V power supply voltage generator circuit waveform timing chart

3-4. Charging Circuit

Fig. 3-10 shows the charging circuit. Charging operation starts when the following conditions are satisfied. W When MiniDisc recorder is not connected to station : The main power is supplied to station and lithium-ion battery is connected. W When MiniDisc recorder is connected to station : The main power is supplied to station and lithium-ion battery is connected either to MiniDisc recorder to station. The charging operation when MiniDisc recorder is connected to station, is described first. When the main power is supplied to the station that is connected to the MiniDisc recorder, the respective system controller ICs of MiniDisc recorder and of station are activated. Then the system controller ICs of MiniDisc recorder and of station check presence and absence of rechargeable lithium-ion battery as shown in Table 3-1. Result of this check is sent from the system controller IC801 of MiniDisc recorder to that IC907 of station with the serial command. (This communication can be checked using the service mode installed this unit. Refer to service manual for more details.) Table 3-1 Presence or absence of lithium-ion battery IC801 pin^ [LIMNT (LI+MNT)] MiniDisc recorder Station side H IC907 pin@ [XLION] L
When the system controller IC907 detects that a lithium-ion battery is connected to either station or MiniDisc recorder, IC907 sets either pin^ [LION] or pin& [STLION] whichever a battery is connected, to H. The P-channel MOS FET inside IC901 is turned ON by this H signal. Next, the system controller IC907 outputs L from its pin^ [LICHG]. CHANGE CONTROL IC902 is started up by this L signal. When IC902 is started up, IC902 outputs L (approximately 3.6 V) from pin4. Q903 and Q901 are turned ON by this L signal to start charging operation with constant current and constant voltage. The LI+ voltage that is output from Q901, is input to the dual Pchannel MOS FET IC901 to supply the LI+ voltage (approximately 4.2 V) to the respective rechargeable lithium-ion batteries via Pchannel MOS FET inside IC901. Table 3-2 Supply of the LI+ voltage Presence or absence of rechargeable lithium-ion battery MiniDisc recorder (MZ-R5ST) : Presence MiniDisc recorder (MZ-R5ST) : Absence Station side (MZS-R5ST) : Presence Station side (MZS-R5ST) : Absence IC907 pin^ [LION] H L

3. RESET operation The RESET switch S954 is installed that allows manual reset because the system controller IC907 keeps activated until the backup battery runs out if it is started once. This RESET switch can be used to exit the service mode and for other purposes. 4. Power supply detection Whether DC IN 9V is supplied or not is detected by pin@ [ACIN] of IC907 because the system controller IC907 keeps activated until the backup battery runs out if it is started once. (L: when DC IN 9V is supplied.) When DC IN 9V is supplied and pin@ [ACIN] of system controller IC907 goes to L while the system backup power is also supplied, the status signal telling that DC IN 9V is supplied, is output from pin% [SD00] of IC907 to the system controller IC801 of MiniDisc recorder in the form of serial data. When IC801 receives the serial data, the reset operation is performed in the MiniDisc recorder.
3-6. Key Input and Switch Detection
Fig. 3-12 shows block diagram of the key input and switch detection circuit of station. The system controller IC907 detects that any of the key switches is pressed, by performing detection shown in Table 3-3 through Table 3-8. Result of detection of the keys and switches that are shaded in these tables can also be checked when the service mode is used. Refer to service manual for more details. Table 3-3 Detection switches Switch Name Switch No. S630 PANEL DOWN S609 S610 S611 S612 S613 S614 S951 S953 S952 S655 S656 POWER PLAY KEY System control IC detect pin Pin^ [PANEL DOWN] Pin@ [POWER KEY] Pin@ [PLAY KEY] Contents of Detection Detect whether panel of LCD is closed or not. ( L: During PANEL DOWN) POWER key detection switch PLAY key detection switch REC key detection switch Input sound source selector switch Timer setting detection switch Synchro recording detection switch ( L: When selecting synchro recording) Presence or absence of lithium battery of station ( L: Presence) RELEASE key detection switch CLOCK SET key detection switch Whether MiniDisc recorder is fixed to station or not. ( L: When MZ-R5ST is connected to station (MZS-R5ST)) Detect the initial position of MiniDisc. ( H: When MZ-R5ST is connected to station (MZS-R5ST)) S604 S605 S606 S607 S608

3-8. Mute Circuit

Fig. 3-14 shows block diagram of the mute circuit (MZS-R5ST). The mute circuit is activated when any of the following three conditions is satisfied. p Conditions 1 When any key such as STOP/ PAUSE / FF is operated (Mute control by pin([AMUTE] of the system controller IC801 of MiniDisc recorder) 2 When MiniDisc recorder is removed and when station is used as a stand-alone unit (Mute control by pin& [PMUTE] of the system controller IC907 of station) 3 When DC plug is removed from station (Mute control by the voltage detector IC316) The mute circuit operation under the respective conditions is described respectively. Because the L-channel and the R-channel use the same circuit configuration, only the flow of L-channel signal is described below. (1) Mute circuit operation under the above described condition 1 When MiniDisc recorder is connected to station, and when any function button such as STOP or FF button requiring the mute operation, is pressed, H is output from pin( [AMUTE] of the system controller IC801. Q301 and Q302 are turned ON by this H signal, and AUDIO +5 V is supplied to Q101 to Q103 so that the respective output signals are muted. (2) Mute circuit operation under the above described condition 2 When MiniDisc recorder is removed or when station is used as a stand-alone unit, H is output from pin& [PMUTE] of the system controller IC907. The mute circuit functions in the same way as described in the above condition 1. Also as Q304 and Q303 are turned ON by this H signal, AUDIO +5 V is supplied to Q104. And the input side of the headphones amplifier IC305 is muted too. (3) Mute circuit operation under the above described condition 3 When DC plug is removed from station, input to pin3 of the voltage detector IC316 goes to L. IC316 has the built-in power supply voltage detection circuit so that it outputs H when the input to its pin3 becomes lower than 4.5 V. This H signal turns on the next stage N-channel MOS FET so that the pin1 potential goes to L which turns on Q302 to activate the mute circuit.

3-9. LCD Backlight Illuminating Circuit
Fig. 3-15 Block diagram of the LCD backlight illuminating circuit Fig. 3-15 shows the block diagram of the LCD backlight illuminating circuit. When the LCD backlight is turned on, H is output from the system controller IC907 pin9 [BLON]. This H signal turns on Q916, Q912 and Q917 so that the UNREG +5 V is supplied to EL901. Then high frequency signal is generated by the transformer EL901 and supplied to the EL element of the LCD block so that the EL element illuminates. Oscillating waveform during normal operation is shown in Fig. 3-16.
Fig. 3-16 Oscillating waveform during normal operation

3-10. Clock Adjustment

Fig. 3-17 Block diagram of clock adjustment Fig. 3-17 shows block diagram of clock adjustment. (1) Operation when MiniDisc recorder is connected to station When the CLOCK SET switch S952 is pressed, input to the system controller IC907 pin@ [CLOCK KEY] goes to L. IC907 detects that the CLOCK SET switch is pressed and at the same time establishes communication with the system controller IC801 of MiniDisc recorder so that the clock setting data is output to IC801. When IC801 receives the clock setting data, it sends the clock setting data from pin! [CLSDIO] to the real time clock IC804 in synchronization with the clock at pin@ [CLSCK] and the chip select signal at pin1 [CLCS]. Thus clock adjustment is performed. (2) Operation when MiniDisc recorder is used as a stand-alone unit When the CLOCK switch S908 is pressed, input to the system controller IC801 pin! [CLOCK] of MiniDisc recorder goes to L. IC801 detects that the CLOCK switch is pressed and at the same time it sends the clock setting data from pin! [CLSDIO] to the real time clock IC804 in synchronization with the clock at pin@ [CLSCK] and the chip select signal at pin1 [CLCS]. Thus clock adjustment is performed.
(3) Operation after time is set When MiniDisc recorder is started its operation, the system controller IC801 output the read-out command from pin! [CLSDIO] to the real time clock IC804 in synchronization with the clock at pin@ [CLSCK] and the chip select signal at pin1 [CLCS]. When the real time clock IC804 receives the read-out command, it sends the clock data to the system controller IC801 in synchronization with the clock at pin@ [CLSCK] and the chip select signal at pin1 [CLCS] in the same manner as the data write mode. When the system controller IC801 receives the time information, it sends the time information to the system controller IC907 in synchronization with the clock that is output from pin$ [SCK0]. Thus the respective ICs receive the time information.

4. SIGNAL CIRCUIT

The signal circuit of this unit is almost same as that of the 4th generation MiniDisc recorder MZ-R30. Therefore, only the following items are described in this manual. Recording circuit n The signal path up to the input stage of the DSP IC503 is described. Playback circuit n The signal (DA data) path after the playback signal is output from the DSP IC503 is described. Refer to NEW TECHNICAL THEORY FOR SERVICING, MZ-R30, OPERATION MANUAL (9-923-089-31) for the description of the signal processing of DSP IC503 and for the description of servo circuit.

4-1. Recording Circuit

1. Operation (of DIGITAL IN/OUT circuit) during digital recording Fig. 4-1 shows block diagram of the DIGITAL IN/OUT circuit. (1) Selection of recording source This unit has the two digital inputs. The recording source selector switch S612 is installed in station. Selection information of this switch is sent to the system controller IC907 pin& [LINEOPT1] and pin& [LINEOPT2]. The system controller IC907 identifies the recording source by recognizing the input as shown in Table. 4-1. Table 4-1 Recording source selector switch S612 Recording source selector switch S612 Line OPT1 OPT2 IC907 pin&[LINEOPT1] L H L IC9O7 pin& [LINEOPT2] L L H IC907 pin![OPT] L H L
(2) DIN SELECTOR IC311 During digital recording, the respective digital data of each input source is input to the DIN SELECTOR IC311 pin! [4B] and pin! [4A]. Then the system controller IC907 outputs the control signal (H: when DIN1 is selected) from pin! [OPT], based on the result of selection of the recording source selector switch S612. The output signal from IC907 pin$ [BUF EN] is the start-up switch signal (L: during starting up IC307) of the level converter 3 V to 5 V IC307. (3) Level converter 5 V to 3 V IC313 The digital input data selected by the DIN selector IC311 is sent to the level converter 5 V to 3 V IC313. IC313 has the function to convert the signal having 5 V amplitude is converted to the signal having 3 V amplitude (exactly speaking 2.9 V amplitude) because the DSP IC503 of MiniDisc recording operates on 2.8 V. After the signal level conversion, IC313 outputs the digital data from pin3 [1Y] to the DSP IC503 pin@ [DIN] of MiniDisc recorder where signal processing for recording is performed. The output signal from the system controller IC907 pin0 [OPT EN] is the start-up switch signal of the level converter inside the level converter 5 V to 3 V IC313. L is output from the system controller IC907 pin0 [OPT EN] when the following conditions are satisfied.
W Conditions : When result of selection of the recording source selector switch S612 is either OPT1 or OPT2, and when mode of MiniDisc recorder is either REC or REC PAUSE. (4) Operation of the digital output circuit Firstly, the digital data that is bi-phase mark modulated inside the DSP IC503, is output from pin@ [DOUT] to the level converter of 3 V to 5 V IC307. IC307 converts the input signal having 2.8 V amplitude to the signal having 5 V amplitude that is output from pin6 [A5] to the DOUT terminal.

2. Operation during LINE recording Fig. 4-2 shows block diagram of the recording circuit during LINE recording. Because the L-channel and the R-channel use the same circuit configuration, only the L-channel is described below. This unit is equipped with the differential conversion circuit at the LINE input in order to realize the same high quality sound as that of deck-type MiniDisc recorder. The differential conversion circuit improves the resolution ability when signal is A/D converted inside the AD/DA converter IC301. When LINE is selected by the input source selector switch S612, input of the system controller IC907 pin& [LINEOPT1] and pin& [LINEOPT2] go to L, and IC907 recognizes that the input source is analog (LINE). When MiniDisc recorder enter the REC mode or the REC PAUSE mode, IC907 output L signal from pin^ [XPWAD]. Q920 is turned OFF by this L signal so that H is input to the AD/ DA converter IC301 pin@ [PWAD] so that the A/D converter inside IC301 is started up. The L-channel signal flow during the LINE recording is described next. The L-channel analog signal that is input from the LINE IN jack J303 passes through the LINE amplifier IC315, the differential buffer IC101 and is sent to the AD/DA converter IC301 pin5 [AINL+] and pin6 [AINL], then to the A/D converter inside IC301 where the input analog signal is converted to the 20-bit digital data. The generated digital data is output to the DSP IC503 alternately via the level converter IC313 and OR gate IC511 in synchronization with the LRCK (Lchannel/R-channel discrimination signal) and BCK (bit clock). The level converter IC313 has the function to convert the signal having 5 V amplitude is converted to the signal having 3 V amplitude (exactly speaking 2.9 V amplitude) because the DSP IC503 of MiniDisc recording operates on 2.8 V. During LINE recording, Q921 is turned on by the DC IN 9 V that is supplied to station so that the input to IC313 pin4 [2OE] is set to L. This L signal activates the level converter circuit inside IC313. Fig. 4-2 (a) shows the waveform timing chart when the following conditions are satisfied. Fig. 4-3 shows the waveform timing of IC301 output side. W Input sound source : 1 kHz, 0 dB signal W Recording level : Adjusted around 2 dB by the REC volume.
Operation during MIC recording
(a) Waveform timing of IC301 output side
(b) Waveform timing example of IC301 output side
Fig. 4-3 Waveform timing of IC301 output side
Fig. 4-4 Block diagram of the recording circuit during MIC recording
Fig. 4-4 shows the block diagram of the recording circuit during MIC recording.
The analog signal that is input from the MIC IN jack is amplified by the microphone amplifier IC302 and input to the AD/DA converter IC303 pin$ [LIN1] and pin$ [RIN1]. The input analog signal is amplified by PGA (Programmable Gain Amplifier) inside IC303, then input to A/D converter in IC303 where the input analog signal is converted to the 16-bit digital data. The generated digital data is output to the DSP IC503 alternately in synchronization with the LRCK (L-channel/R-channel discrimination signal) and BCK (bit clock). In the AD/DA converter IC303, the internal multiplexer receives the serial command (input source selection command and others) from the system controller IC801 pin( [SD02] and selects the input source. Because MiniDisc recorder uses the A/D converter inside the AD/DA converter IC303 only during MIC recording, IN1 is always selected as the input source. The AD/DA converter IC303 has the built-in PGA (Programmable Gain Amplifier) which is used to enable either AUTO gain mode recording or MANUAL gain mode recording during MIC recording. PGA adjusts the MIC gain by means of software during the AUTO mode, and adjusts the MIC gain in accordance with the value set by user during the MANUAL mode. The MIC recording is possible when MiniDisc recorder is operated without station. When MiniDisc recorder is connected to station (MZSR5ST), the MIC recording is not possible.

4-2. Playback Circuit

(1) Basic configuration of playback circuit
Fig. 4-5 Playback circuit basic block diagram Fig. 4-5 shows the playback circuit basic block diagram of MiniDisc system. The RF data that is read by the optical block is EFM-demodulated by the EFM demodulator, and is performed the error detection and error correction by the ACIRC decoder. Because the MiniDisc data has the same data structure as that of CD-ROM format, the RF signal is decoded by the CD-ROM decoder. Then the ATRAC data that is obtained by decoding has already compressed into 1/5 of original data, and is stored once in the shock proof memory (buffer RAM). This memory stores not only the ATRAC data but also the error information (C2PO) and TOC/UTOC information too. Next, the ATRAC data that is periodically read out from the shock proof memory, is expanded to the 16-bit or 20-bit linear data by the next stage ATRAC decoder. The ATRAC data is then converted to analog signal by the next stage D/A converter. (2) Playback circuit Fig. 4-6 shows block diagram of the playback circuit, when MiniDisc recorder is connected to station. The DA data that is output from the DSP IC503 of MiniDisc recorder is sent to the AD/DA converter IC301 via the level converter 3 V to 5 V IC 307. The DA data is converted to the L-channel and R-channel analog signal by D/A converter located inside IC301. The output analog signal is sent to the LINE OUT jack J304 via the LINE OUT amplifier IC302, and is sent to the HEADPHONES OUT jack J302 via the LINE OUT amplifier IC302, the PB VOLUME RV302 and headphone amplifier IC305. It is also output to the ACTIVE SPEAKER OUT jack J301 via the LINE OUT amplifier IC302, EVR IC304 and buffer IC317. Regarding the signal output to MiniDisc recorder (MZ-R5ST), signal flow of L-channel signal only is described below. When MiniDisc recorder is connected to station, you can listen to sound from the HEADPHONES output of MiniDisc recorder. The headphone output signal is created as follows. The analog signal that is output from the AD/DA converter IC301 is sent to the audio gain amplifier IC305 via differential amplifier consisting of IC330, IC130 and IC131. After the audio volume is controlled by the audio gain control IC305 and by the communication with the system controller IC801, the audio signal is output from the HEADPHONES OUT jack J302 via the headphone amplifier IC805. (3) System controller IC907 It controls the output signal during playback as shown in Table 4-2. Table 4-2 Control signals during playback IC9O7 pin$ [BUF EN] IC307 during STOP IC907 pin* [XPWDA] D/A converter during STOP IC9O7 pin1 [DEEMP] De-emphasis during OFF

Table 5-2 List of power supply identification Pin@ [DCIN] L H H H Pin^ [LIMNT] L H L L Pin% [AM3] L L H H
1. Rechargeable lithium-ion battery (LIP-12 (H)) 2. Rechargeable lithium-ion battery (LIP-8) 3. SONY alkaline dry cell (LR6 (size AA) 2 dry cells)

5-3. Circuit voltage

For about 9 hours For about 6.5 hours For about 16 hours For about 13 hours
4. Rechargeable nickel-hydrogen battery For about 3 hours (BP-DM20) 5. 1+3 For about 8.5 hours 6. 2+3 7. 1+4 8. 2+4 For about 8.5 hours
Fig. 5-1 Supply voltages generation block diagram
When MZ-R5ST is connected to station, the following nine kinds of voltage are generated by Mini Disc recorder (MZ-R5ST). (Refer to Fig. 5-1.) 1 UNREG voltage n Supplied from station This is 5.0 V power that is supplied from station. This is 5.0 V power for the driver of the coil/motor drive IC505. 2 MICON +B voltage n RESET ( 2.9 V REG) IC802 This is 2.9 V power that is used for driving the system controller IC801. 3 Power for CLV circuit n 2.8 V DC-DC converter (IC806, Q803 to Q805) This is 2.8 V power that is used in the CLV circuit (RF amplifier IC501, digital signal processor IC503, coil/motor drive IC505, etc.) 4 Power for REC DRIVE logic circuit n 5 V REG (IC506) This is 5.0 V power that is used for driving the logic circuit inside the REC DRIVE IC506. 5 Power for stepping motor driver n 1.2 V/1.5 V REG (IC506) This is 1.5 V power that is used as the H-bridge power supply for stepping motor. 6 Power for REC DRIVER n 1.2 V/1.5 V REG (IC506) This is 1.2 V power that is used as the power supply for the over-write head driver during recording. 7 Power for stepping motor n 12 V REG (IC505) This is 12 V power that is used for the power supply of pre-driver inside IC505. This 12 V power that is used to drive stepping motor. 8 Power for audio circuit n 2.8 V DC-DC converter (IC806, Q803 to Q805) This is 2.8 V power that is used for audio circuit (AD/DA converter IC303, audio gain control IC305, etc.) 9 Power for microphone amplifier IC302 n 2.5 V REG (IC301) This is 2.5 V power that is used to drive the microphone amplifier IC302.
The respective powers are described how they are generated. 1. Generating the UNREG voltage When DC plug is connected to DC jack of station (MZS-R5ST), the UNREG 5.0 V power that is generated by the power supply circuit of station, is supplied to MiniDisc recorder. Refer to the power supply circuit description of station for more details. 2. Generating the MICON +B voltage When the UNREG power is supplied to the RESET IC802 pin6 [VDD], the MICON +B voltage is generated by the step-up/step-down regulator and is output from pin5 [VOUT]. 3. Generating the Power for CLV circuit

Fig. 5-2. 2.8 V DC-DC converter circuit
Fig. 5-2 shows the 2.8 V DC-DC converter circuit block diagram. The UNREG voltage is supplied to the voltage control IC806 pin3 [VCC], and when output from the system controller IC801 pin# [PCONT] goes to L, IC806 starts up. When IC806 starts up, PWM waveform that is generated by the internal PWM comparator is output from pin5 [OUT]. The PWM waveform is sent to Q803, Q804 and Q805 which start switching operation, and the step-down DC-DC converter circuit starts up too. Output of Q804 is smoothed out by C809, divided by the voltage-divider resistor of R814, RV801 and R815. Output voltage obtained by the voltage-divider resistor is fed back to IC806 pin1 [IN]. Based on this feedback voltage, IC806 controls the voltage by controlling the PWM waveform duty generated by the PWM converter inside. Thus the 2.8 V power for CLV circuit and 2.8 V power for audio circuit are generated. The SLEEP function is described next. The SLEEP function is used in order to realize the low power consumption when MiniDisc is operated on battery such as rechargeable lithium-ion battery. When about ten seconds have passed after MiniDisc recorder enter the STOP state, IC806 is stopped of its operation by setting pin# [PCONT] output to H. The 2.8V DC-DC converter is stopped by this H signal.
Fig. 5-3 shows the waveform timing of the 2.8 V DC-DC converter circuit.
Fig. 5-3 Waveform timing chart (When MiniDisc is operated on rechargeable lithium-ion battery) 4. Generating the REC DRIVE logic voltage 5 V is generated form the CLV circuit voltage 2.8 V by the step-up converter consisting of the REC DRIVE IC506 pin7 [VG], L514, D502 and C565. The generated 5 V is used for the logic circuit inside IC506.
Generating the power for stepping motor/REC driver
Fig. 5-4 1.2 V/1.5 V regulator block diagram Fig. 5-4 shows block diagram of the 1.2 V/1.5 V regulator circuit. The mode setting table of the REC DRIVE IC506 is shown in Table 5-3. IC506 switches the internal operating mode according to the control signal output from pin# [MODE1] and pin# [MODE2] of the system controller IC801 as shown in the table. When stepping motor is activated, the system control IC801 outputs L signal from pin# [MODE1] and also L from pin# [MODE2]. Q505 is turned OFF by this L signal. As a result, the step-down regulator inside IC506 becomes the 1.5 V regulator, and 1.5 V is output from pin@ [VB] of IC506. Next, during recording mode, the system controller IC801 outputs H signal from pin# [MODE1] and L from pin# [MODE2]. Q505 is turned ON by this H signal. As a result, the step-down regulator inside IC506 becomes the 1.2 V regulator, and 1.2 V is output from pin@ [VB] of IC506. Thus the step-down regulator inside IC506 is switched of its operation by changing the reference voltage of error amplifier as Q505 is turned on or off. At the same time, the sawtooth wave that is generated internally by IC506, is generated based on 176.4 kHz signal which is output from the digital signal processor IC503 pin( [FS4]. Table 5-3 List of IC506 mode settings MODE 1 H L L H MODE 2 H H L L STEP UP REG STOP POWER ON POWER ON POWER ON STEP DOWN REG STOP STOP POWER ON 1.5 V output POWER ON 1.2 V output EFM logic block STOP STOP

Operation mode During STOP and PLAY Not used

STOP POWER ON

When stepping motor is operating During recording
Generating the power for stepping motor
Fig. 5-V DC-DC converter circuit Fig. 5-5 shows block diagram of the 12 V DC-DC converter. The coil/motor drive IC505 has the 12 V DC-DC converter internally in it. The 12 V DC-DC converter starts operating when coil (L505), switching diode (D501) and smoothing capacitor (C555) are externally connected. The 12 V DC-DC converter generates the power supply voltage to be used by the pre-driver inside IC505, and the 12 V power supply voltage for stepping motor. This 12 V DC-DC converter operates in synchronization with the clock (176.4 kHz) supplied from the digital signal processor IC503 pin( [FS4].
Generating the power for microphone amplifier IC302
Fig. 5-6 Generation of microphone amplifier IC302 drive voltage Fig. 5-6 shows block diagram to generate the microphone amplifier IC302 drive voltage. When microphone plug is connected to the MIC jack as shown, input to the system controller IC801 pin^ [MICDET] goes to L. Q301 is turned ON by this L signal. Then 2.8 V is supplied to the 2.5 V regulator IC301 pin5 [XCE] that starts up IC301. When IC301 starts, 2.5 V is generated by internal series regulator and is output from pin3 [OUT] that activates the microphone amplifier IC302.
5-4. Theory When MiniDisc Recorder Is Operated On Battery
Fig. 5-7 shows the power supply circuit when MiniDisc is operated on battery. 1. Operation when MiniDisc is operated on rechargeable lithium-ion battery. When a rechargeable lithium-ion battery is connected, battery voltage is applied to the RESET IC802 pin6 [VDD] via a diode inside the dual N-channel MOS FET IC808. When IC802 is started up, the MICON +B 2.9 V is generated by the step-up/step-down regulator inside IC802. IC802 outputs the generated 2.9 V from pin5 [VOUT] to the system controller IC801 pin* [VDD]. As the system controller IC801 is started up, the system controller IC801 detects whether a rechargeable lithium-ion battery is connected or not at pin^ [LIMNT (LI + MNT)]. When the system controller IC801 detects that a lithium-ion battery is connected, it outputs H from pin# [BATTON]. When this H signal is output, the 12 V power that is generated by the coil/motor drive IC505 is divided by the voltage-divider resistor R830/R831 to develop about 9 V that is sent to the dual N-channel MOS FET IC808 pin5 [NG2] so that the N-channel FET is turned on. Then the UNREG 3.7 V is output from IC808 pin8 [ND2]. 2. Operation when MiniDisc is operated on external battery. When external battery such as nickel-hydrogen battery is connected, battery voltage is applied to the RESET IC802 pin6 [VDD] via D801 to start up IC802. The RESET IC802 has the built-in power supply voltage detection circuit which maintains the VDD input voltage to 3.4 V or higher by the self step-up circuit consisting of L801, D808, C831 and the switching output of pin8[LX]. At the same time, when IC802 is started up, the MICON +B 2.9 V is generated by the step-up/step-down regulator inside IC802. IC802 outputs the generated 2.9 V from pin5 [VOUT] to IC801 pin* [VDD]. When the system controller IC801 is started up, the system controller IC801 detects whether external battery is connected or not at pin% [AM3]. If IC801 detects that external battery is connected, it outputs H from pin@[XAMCN]. When this H signal is output, the 12 V power that is generated by the coil/motor drive IC505 is divided by the voltage-divider-resistor R825/R803 to develop about 9 V that is sent to the dual N-channel MOS FET IC808 pin4 [NG1] so that the N-channel FET inside IC808 is turned on. Then the UNREG 3.0 V is output from IC808 pin1 [ND1]. p The respective voltage outputs The power supply voltages are supplied in the same way as when MiniDisc recorder is connected to station (MZS-R5ST). Refer to section 5-3 Circuit Voltage, sub-sections 3 to 9 for more details. W Technical tip W The dual N-channel MOS FET IC808 has an internal diode. Because forward voltage (Vf) of this diode is above 0.7 V, it can have a case that MiniDisc cannot surely starts working when the power supply voltage is low using size AA battery or like. Therefore, D801 is installed in MiniDisc.