MD-MT877/MD-MT877C

SERVICE MANUAL

No. S3118MDMT877/

PORTABLE MINIDISC RECORDER
MD-MT877(S) MODEL MD-MT877C(S)
In the interests of user-safety the set should be restored to its original condition and only parts identical to those specified be used.

CONTENTS

Page SPECIFICATIONS...... 2 NAMES OF PARTS...... 3 OPERATION MANUAL...... 5 DISASSEMBLY...... 10 REMOVING AND REINSTALLING THE MAIN PARTS... 11 ADJUSTMENT...... 12 NOTES ON SCHEMATIC DIAGRAM..... 28 TYPES OF TRANSISTOR AND DIODE.... 28 BLOCK DIAGRAM...... 29 SCHEMATIC DIAGRAM..... 30 WIRING SIDE OF P.W.BOARD.... 32 VOLTAGE...... 36 WAVEFORMS OF MD CIRCUIT..... 37 TROUBLESHOOTING..... 38 FUNCTION TABLE OF IC..... 41 PARTS GUIDE/EXPLODED VIEW PACKING OF THE SET (MD-MT877(S) FOR U.S.A. ONLY)

SHARP CORPORATION

This document has been published to be used for after sales service only. The contents are subject to change without notice.
FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL.

SPECIFICATIONS

Rechargeable Nickel-Metal Hydride battery (AD-N55BT) x 1 AC adaptor (AC 120V, 60 Hz) Commercially available, AA size (LR6), alkaline battery x 1 Separately available car adaptor, AD-CA55X (for cars with a 12-24V DC negative ground electrical system) (Used with separately available plug adaptor (AD-M66PA)) Power consumption 7 W (AC adaptor) Output power RMS; 10 mW (5 mW + 5 mW) (0.2% T.H.D.) Charging time Approx. 3.5 hours Input sensitivity MIC H: reference input level 0.25 mV input impedance 10 k ohms MIC L: reference input level 2.5 mV input impedance 10 k ohms LINE: reference input level 100 mV input impedance 20 k ohms Output level Earphones: maximum output level 5 mW + 5 mW load impedance 32 ohms LINE: specified output 250 mV (-12 dB) load impedance 10 k ohms Dimensions Width: 2-27/32 (71.9 mm) Height: 11/16 (16.8 mm) Depth: 3-1/8 (78.7 mm) Weight 0.29 lbs. (131 g) with rechargeable battery Input jack Output jack Type Signal readout Audio channels Frequency response Rotation speed Error correction Coding Recording method Sampling frequency Wow and flutter Battery life Line/optical digital, microphone (powered by the main unit) Earphones (impedance: 32 ohms)/remote control unit Portable MiniDisc recorder Non-contact, 3-beam semiconductor laser pickup Stereo 2 channels/monaural (long-play mode) 1 channel 20 20,000 Hz ( 3 dB) Approx. 400 1,350 rpm ACIRC (Advanced Cross Interleave Reed-Solomon Code) ATRAC/ATRAC3 (Adaptive TRansform Acoustic Coding), 24-bit computed type Magnetic modulation overwrite method 44.1 kHz (32 kHz and 48 kHz signals are converted to 44.1 kHz, and then recorded.) Unmeasurable (less than 0.001% W. peak) Stereo Continuous Continuous recording: play: Approx. Approx. 6.5 hours 12 hours Continuous Continuous recording: play: Approx. Approx. 6 hours 16 hours Continuous Continuous recording: play: Approx. Approx. 15 hours 29 hours 2 times long Continuous Continuous recording: play: Approx. Approx. 9 hours 13.5 hours Continuous Continuous recording: play: Approx. Approx. 10 hours 19.5 hours Continuous Continuous recording: play: Approx. Approx. 22 hours 33 hours 4 times long Continuous Continuous recording: play: Approx. Approx. 11.5 hours 15 hours Continuous Continuous recording: play: Approx. Approx. 13 hours 22 hours Continuous Continuous recording: play: Approx. Approx. 30 hours 40 hours Power source DC 1.2V: DC 5V: DC 1.5V: DC 1.5V:

The MiniDisc can- q Has the track number or character not be ejected. information been updated on the disc yet? q Is the unit in the recording or editing mode? Recording and q Is the MiniDisc protected against editing are imaccidental erasure? possible. q Is the unit connected properly to the other equipment? q Is the AC adaptor unplugged or did a power failure occur while recording or editing? q Is the unit in the hold mode? q Is an optical signal being output from the stereo system? Read the operation manual for the stereo system. The battery cannot q Is the select switch for charging/ be charged. operation set on the charging side? q Is the jack clean? Nothing appears q Is the remote control display set to on the remote LIGHT OFF? control display.
Insert a MiniDisc Inserte un minidisco
Insert according to the direction of the arrow.
Connect the AC adaptor Conecte el adaptador de CA
AC 120V, 60 Hz 120V CA, 60Hz
Insrtelo de acuerdo con la direccin de la flecha.

RELEASE LOCK

1 Slide the OPEN lever to re- 3 Insert a MiniDisc as shown.
lease the compartment door. Deslice la palanca OPEN para abrir la puerta del compartimiento.
To an AC outlet A un tomacorriente de CA
Inserte un minidisco como se muestra.

A la toma DC IN 5V

Insert securely, all the way in.

4 Close the compartment.

Cierre el compartimiento.
Insrtelo con seguridad a fondo.

2 Lift it up.

Levantelo.
1 Move the Charge/Operation
switch to Charge mode (RELEASE).
Mueva el selector de carga/ operacin al modo de carga
3 Move the Charge/Operation
switch to Operation mode (LOCK).
Mueva el selector de carga/ operacin al modo de operacin (LOCK).
When you record on a MiniDisc, check that the erase prevention tab is set to the recordable position.

(RELEASE).

Recordable Para poder grabar
Recording prevented Para no poder grabar
Cuando desee grabar en un minidisco, compruebe que la lengeta de proteccin contra borrado est colocada en la posicin para "poder grabar".
2 Insert the portable MD into

0032 03C08A0032

When the PLAY button is pressed while a target address is displayed, continuous playback is performed after searching that address. Whenever the MODE button is pressed in the TEST-REC mode target address is displayed, the digit which is changed by the FAST FORWARD/REVERSE button changes as follows.
When the FAST FORWARD button is pressed in the TEST-REC mode target address is displayed, the digit of address specified by the MODE button is set to +1h.(0 to F) When the FAST REVERSE button is pressed in the TEST-REC mode target address is displayed, the digit of address specified by the MODE button is set to -1h. (0 to F) * When the FAST FORWARD/REVERSE button is held down, the setting changes continuously, one cycle being 100 ms. When the VOLUME+/ button is pressed in the TEST-REC mode or continuous record mode, the laser record power changes. (Servo gain changes also according to record power.) * After the laser record power is indicated for one second, the ad] dress indication is restored. [ R P W _ : Address : Laser power cord Operation is disabled if the premastered disc or disc is in miseraseprotected state.
8. Error data display Mode
Reversing when FAST REVERSE button is pressed When the STOP button is pressed while the error data indication menu appears or during error data indication, the mode changes to the TEST mode stop state. Error data 0 is the latest error. Error which occurred in the TEST mode is also stored in the memory. When the DISP button is pressed while the error data indication menu appears, the error data is initialized. [ C L E A R _ ] : Error Code
Explanation of error history code
13h : Adjustment servo retraction excessive retrial 16h : C. IN detection time-over 17h : A, B, E, F, and TCRSO offset measurement value out of tolerable range 21h : Focus retraction completion allowable time-over 23h : Track search completion allowable time-over 32h : P-TOC read failure 42h : U-TOC read failure 44h : U-TOC write data write disabled/read check error 45h : U-TOC write test failure 52h : SD write data write disabled 72h : EEPROM data read check sum error 73h : Record head drive disabled (by EJECT lever) 91h : Ambient temperature is higher that the allowable temperature

Set values 02H 01H 30H 20H D0H 4BH 18H C0H FEH A6H 54H 24H 22H 17H 11H 00H 64H A6H 94H A0H C0H 1FH 50H 5AH 00H D0H 66H FCH 00H 80H 20H BFH 02H 16H 00H 00H 81H 80H 00H 80H 00H 00H 00H

ADJ.SET setting

Item display COK _ FAT _ TAT _ CAT _ FAB _
DR1 _ DR2 _ IN1 _ IN2 _ INH _ DRH _ PLE _ RCE _

Digital EQ setting

Item display HQ1 _ HQ2 _ HSG _ HSO _ LQ1 _ LQ2 _ LSG _ LSO _ GQ1 _ GQ2 _ GSG _ EQP _ Set values 90H 90H 11H FDH 90H 90H 11H 00H 98H 84H 11H 00H
ELT _ X2T _ SDF _ CHV _ DRS _ DUP _ RFL _ CG1 _ FB0 _ RST _ R20 _ R21 _ R40 _ R41 _ FBL _ MC2 _ MC4 _ L2H _ L4H _ SPM _ MSL _ US0 _ US1 _ US2 _
Do the following when replacing the mechanism, the pickup, the EEPROM (IC402), the LSI(IC201) or the main PWB unit.
Enter the test mode, move the pickup to the most internal periphery and execute AUTO1. (Use the disc of MMD-213A.)

Normality completion

(During the spare style automatic adjustment)

ADJ.OK

(During the adjustment that ATT is automatic)
Remote controller P-MODE button (During the focus balance adjustment)

The indication of RAMDOM

STOP is pushed (Adjustment completion)
The indication of "TEST" AUTO2 It is made to carry it out
PLAY Move the pickup to the most internal periphery and press the BASS button (Fast Forward Button)

AP####

STOP is pushed
(Continuance is regenerating) It confirms that an address proceeds
Indication disappears All the supply of the power supply is turned off
(In such cases as the battery) If you replaced EEPROM, set the EEPROM valume to the final version.
Test Mode Start Completion methool
Starting method of the test mode When the unit is in the stand-by state (with no display), the test mode is started by performing the following operation using the remote control. Press the [PLAY] button while pressing the [PLAY-MODE] button, and release the [PLAY-MODE] button while keeping the [PLAY] button pressed, and press the [VOLUME] button. Indication after the start :
: To the test mode stop ([Test mode menu]) Performance mode Playback volume LINE REC volume Microphone REC volume Resume setting : Version indication 2 seconds EEPROM version Destination =Normal =28 =30 =20 =Cancellation

Volume+

Volume -
Program version : LCD all the lighting two seconds

All the lighting TEST

How to cancel the test mode : Test mode stop

BYE BYE OK

: [OK] or [NG] Check the microcomputer RAM and EEPROM with the contents of the preliminary adjustment.

T-PLAY Each indication

Others indication
: Focus balance Adjustment mode : Focus balance # # # : Jitter error
* The focus balance adjustment mode is available only for low reflection discs. * The RANDOM marker lights up in the focus balance adjustment mode. * The focus balance ( ) can be changed by the VOL UP/DOWN button operation. * If the PLAY button is pressed in the focus balance adjustment mode, the unit returns to the continuous playback mode.

Continuous Record

Enter the EEPROM setting mode, and press the FAST FORWARD button. Change the MSL setting value from 00 to 08 by using CTRL_ (control setting menu). (If the MSL remains in 00, no signal is recorded.) Continuous record from the current pickup position

AP#### T REC

: Continuous record # # # #: Address
Continuous record playback from any address : Continuous record menu

AP# # # #

* When the [STOP] button is pressed in specific condition, the "TEST MODE STOP" state is set. * In the start address set state the start address changes as follows when the [DISP] button is pressed. H (initial value) 03C0H 0700H 08A0H DISP DISP DISP
* In the start address setting state the start address change digit changes when the [P-MODE] button is pressed. 1st digit (initial value) 2nd digit 3rd digit MODE MODE
MODE * In the start address set state the value of selection digit changes in the range of 0h to Fh when the [FAST FORWARD/REVERSE] button is pressed. * In the continuous record state and start address set state the record laser power changes in the range of "0h to Fh" when the [VOLUME +/] button is pressed. (Initial value 0DH)
Servo Pre-Manual Adjustment MANU1
PLAY : Pre-Manual Adjustment menu : Temperature code indication $ $ : Temperature code : A signal offset (AINO) measurement : Measurement value SKIP DOWN : B signal offset (BINO) measurement : Measurement value SKIP DOWN : E signal offset (EINO) measurement : Measurement value SKIP DOWN : F signal offset (FINO) measurement : Measurement value : Laser ON (play power) : AB signal level measurement (ABMAXO) : Measurement value SKIP DOWN : A-ATT (focus) tentative setting : ATT setting : B-ATT (focus) tentative setting : ATT setting SKIP DOWN : Pit section EF signal level measurement (LPFEFO) : Measurement value : Pit section adjustment COUT level setting : COUT level setting SKIP DOWN : Groove section EF signal level measurement (LPFEFO) : Measurement value SKIP DOWN : Groove section adjustment COUT level setting : COUT level setting SKIP DOWN : TCRS signal level measurement (TCRSMIO) : Measurement value SKIP DOWN : E-ATT (tracking) initial setting : ATT setting SKIP DOWN : F-ATT (tracking) initial setting : ATT setting SKIP DOWN : AB input level measurement (LPFABO) : Measurement value SKIP DOWN : A-ATT (focus) initial setting : ATT setting SKIP DOWN : B-ATT (focus) initial setting : ATT setting : TCRS signal offset (TCRSO) measurement : Measurement value

* When the [STOP] button is pressed in specific condition, the "TEST MODE STOP" state is set. * If the [BASS] button is pressed in the laser ON state (with no disc or the lid open), laser power changes as follows. Play back Record power Maximum power BASS BASS 1 (initial value) 10 384
* In the specific setting display state the setting change digit changes when the [P-MODE] button is pressed. In the case of the setup value two digits. 1st digit (initial value) 2nd digit

P-MODE P-MODE

In the case of the setup value three digits. 1st digit (initial value) 2nd digit

3nd digit

P-MODE
* In the specific state the setting changes in the range of "0h to Fh" when the [VOLUME +/] button is pressed. * If the [DISP] button is pressed, the display changes as follows.

ABMAXO measurement value

DISP DISP
: A-ATT (focus) tentative setting : B-ATT (focus) tentative setting : ABMAXO measurement value indication "1" Mark lighting

LPFABO measurement value

: A-ATT (focus) tentative setting : B-ATT (focus) tentative setting : LPFABO measurement value indication "1" Mark lighting

LPFEFO measurement value

PCH GCH
: Pit section adjustment COUT level setting : Group section adjustment COUT level setting
LPFEINO/EFMIO measurement value
: LPFEFO measurement value indication "1" Mark lighting : E-ATT (tracking) initial setting : LPFEINO measurement value indication "1" Mark lighting DISP : EFMIO measurement value indication "REPEAT", "1" Mark lighting : F-ATT (tracking) initial setting : LPFFINO measurement value indication "1" Mark lighting DISP : EFMIO measurement value indication "REPEAT", "1" Mark lighting
LPFFINO/EFMIO measurement value
Servo ATT Manual Adjustment MANU2
PLAY : ATT manual adjustment menu : Temperature code indication $ $ : Temperature code : Laser ON (play power) : Pit section E-ATT (tracking) setting : ATT setting SKIP DOWN : Pit section F-ATT (tracking) setting : ATT setting SKIP DOWN : High reflection A-ATT (focus) setting : Low reflection A-ATT (focus) setting : ATT setting SKIP DOWN : High reflection B-ATT (focus) setting : Low reflection B-ATT (focus) setting : ATT setting SKIP DOWN : TCRS ATT setting : ATT setting :Groove section E-ATT (tracking) setting : ATT setting SKIP DOWN :Groove section F-ATT (tracking) setting : ATT setting SKIP DOWN : Low reflection A-ATT (focus) setting : ATT setting SKIP DOWN
: Low reflection B-ATT (focus) setting : ATT setting * When the [STOP] button is pressed in specific condition, the "TEST MODE STOP" state is set. * If the [PLAY] button is pressed in the B-ATT setting state, the mode is changed to the continuous playback mode. And if the [P-MODE] button is pressed in the continuous playback state, the mode is changed to the B-ATT setting state of the ATT manual adjustment.

g j : High-reflection pit section B-ATT (focus) setting : Low-reflection pit section B-ATT (focus) setting : Low-reflection groove section B-ATT (focus) setting : ATT setting P-MODE : Continuous playback (pit section) : Continuous playback (groove section) # # # # : Address

HB Lb LB

* If the [BASS] button is pressed in the laser ON state (with no disc or the lid open), laser power changes as follows. Playback power Record power Maximum power

BASS BASS

* In the specific setting display state the setting change digit changes when the [P-MODE] button is pressed. 1st digit (initial value) 2nd digit 3rd digit
MODE * In the specific state the setting changes in the range of "0h to Fh" when the [VOLUME +/-] button is pressed. * If the [DISP] button is pressed, the display changes as follows. LPFABO measurement value

HA HB La Lb LA LB

: High-reflection pit section A-ATT (focus) setting : High-reflection pit section B-ATT (focus) setting : Low-reflection pit section A-ATT (focus) setting : Low-reflection pit section B-ATT (focus) setting : Low-reflection groove section A-ATT (focus) setting : Low-reflection groove section B-ATT (focus) setting
TCRSMIO measurement value
: LPFABO measurement value indication "1" Mark lighting

: TCRS ATT setting

: TCRSMIO measurement value indication "1" Mark lighting : Pit section E-ATT (tracking) setting : Groove section E-ATT (tracking) setting
: LPFEINO measurement value indication "1" Mark lighting DISP : EFMIO measurement value indication "REPEAT", "1" Mark lighting : Pit section F-ATT (tracking) setting : Groove section F-ATT (tracking) setting

EF PF GF

: LPFFINO measurement value indication "1" Mark lighting DISP : EFMIO measurement value indication "REPEAT", "1" Mark lighting
Servo Pre-adjustment Value Check RSLT1
PLAY : Pre-adjustment Value Check menu
: A signal offset measurement value (setting)
: B signal offset measurement value (setting)
: E signal offset measurement value (setting)
: F signal offset measurement value (setting)
: TCRS signal offset measurement value
: EF signal measurement value
: TCRS signal measurement value
: AB signal input measurement value : Pit section adjustment COUT level setting SKIP DOWN : Groove section adjustment COUT level setting SKIP DOWN : A-ATT (focus) initial setting SKIP DOWN : B-ATT (focus) initial setting SKIP DOWN : E-ATT (tracking) initial setting SKIP DOWN : F-ATT (tracking) initial setting

SKIP UP SKIP UP SKIP DOWN

: Control setting menu

: LSI setting TEST mode menu

TEMP Setting

: Temp setting menu : TEMP standard value setup : Setup value $ $ : Temperature code : TEMP A/D input value indication

T P i n

* When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set. * When the [DISP] button operation is performed in the specific state, the menu changes to "TEMP SETTING menu". * When the [P-MODE] button is pressed in each state, the set digit is changed. 1st digit (initial value) 2nd digit

Setup except for TEMP

Each setup menu
: Each setup menu except for TEMP : Each setup item except for TEMP : Setup value

Setup item

* When the [STOP] button is pressed in specific menu, the "TEST MODE STOP" state is set. * When the [DISP] button operation is performed in the specific state, the menu changes to "TEMP SETTING menu". * In the specific setting display state the setting change digit changes when the [P-MODE] button is pressed. 1st digit (initial value) 2nd digit
NOTES ON SCHEMATIC DIAGRAM
Resistor: To differentiate the units of resistors, such symbol as K and M are used: the symbol K means 1000 ohm and the symbol M means 1000 kohm and the resistor without any symbol is ohm-type resistor. Besides, the one with Fusible is a fuse type. Capacitor: To indicate the unit of capacitor, a symbol P is used: this symbol P means pico-farad and the unit of the capacitor without such a symbol is microfarad. As to electrolytic capacitor, the expression capacitance/withstand voltage is used. (CH), (TH), (RH), (UJ): Temperature compensation (ML): Mylar type The indicated voltage in each section is the one measured by Digital Multimeter between such a section and the chassis with no signal given. Parts marked with ( ) are important for maintaining the safety of the set. Be sure to replace these parts with specified ones for maintaining the safety and performance of the set.
REF. NO SW401 SW901 SWA01 SWA02 SWA03 SWA04 SWA05 SWA06 SWA07 SWA08 SWA09 SWA10 SWA11 SWA12 SWA13 EJECT DISC PROTECT RECORD PLAY BASS EDIT DISPLAY VOLUME VOLUME + STOP MODE FAST REVERSE FAST FORWARD ENTER OPEN/CLOSE DESCRIPTION POSITION OFFON OFFON OFFON OFFON OFFON OFFON OFFON OFFON OFFON OFFON OFFON OFFON OFFON OFFON OFFON
TYPES OF TRANSISTOR AND DIODE

TOP VIEW

B (G) (3) E (S) 1 1

C (D) (2)

2SA17457 2SA1832 GR 2SC4738 GR 2SD1979 S DTC144 EE RN1104 RN1444 A TOP VIEW

F10J2E

L202 10H

R762 100K

R200 100K

Q443 2SC4738 GR

R441 120

R754 180K R761 390K

BEEP HP

CR-CH CCR729
R728 C731 1K 0.22 4.7K R730 C721 4.7K
R727 8.2K 3.3/10 C722 3.3/10

R723 6.8K

DAT LHPVCC RHPVCC

RCAULT AUSCLK AUDATA

R442 820
EMPH0 AURESET PBMUTE BEEP PBAULT

R733 47K

RR766 C766 0.22 15

KEY PLAY

5 C200 C0.1
IC200 62GR2522 2.5V REGULATOR
R757 2.2K C760 0.1 R732 47K
RHPVEE AMP&GAIN SEL. AMP&GAIN SEL. LHPVEE
RIN LIN ATT ATT LLPFO RLPFO LPF LPF L R

R445 10K

D495 MA8075M

R758 100

C723 0.001 C492 1
R724 6.8K L714 TPL713 TPR-CH L712 TPL711 1
C724 0.001 D496 MA8075M LD494 15AZ7.5Y R492 1K D492 15AZ7.5Y C491 0.1 L454 L452 L453

J702 MIC IN

CLK LAT

R411 100K

RKEY RPLAY

IC402 58X2404T EEPROM

Q442 RN4911

R731 47K

C753 1

IC703 IR3R59N AUDIO AMP.

C869 47/6.3

C765 0.22

TP726 TP725 TP722 TP724 TP723 TP721 TP727 TP728

D491 015Z5.1Y C451 0.022

L458 D493 015Z5.1Y
J703 REMOTE CONTROL/ EARPHONES TERMINAL

3 C773 0.22

4 C774 1
C771 IC771 47/6.3 62GR2322 2.3V REGULATOR

R413 1K

IC404 N7SZ86P5 GATE IC

2.73V 2.21V

Q493 2SA1832 GR

R495 1K C493 0.47

R496 22

DCEXT PLVDCI _DCIN PCNT3

D772 F10J2E

D771 F10J2E

C817 0.1 R818 47K R881 R882 18K 10K

R812 100K

C776 1

R813 2.2K

VCC GND

3 0V 1 0V DTC144

D862 F10J2E

D852 F10J2E C852 22/6.3

C863 1

C862 1

R871 10K C775 1

D861 F10J2E

L851 10H C851 3.3
IC871 CTC7S86FU EXCLUSIVE OR GATE
C845 D842 0.1 HRB0103B RD841 F10J2E 3 C846 0.1 L841 4.7 C847 1

TP842 N.C.

R816 100K Q807 HN1C01 FU 123 R828 2.2K

0V 0.85V

C881 0.027

R817 100K

C859 1

R855 180K C856 150P (CH)

C839 0.33

STAND BY

IC873 62GR4522 4.5V REGULATOR

C841 1

R829 100K

R831 180K C401 0.1

Q R CMP RSFF S

CC843 0.22

D432 1SS372
C858 DG F10J2E S R854 10K C857 ERRAMP 5 EO R857 33P 560K EIN (CH) 6 R832 180K 7 EIP R834 R853 270K 1.5M 8 ROSC C827 R826 R824 82P 10K (CH) ERRAMP 3.9M 5 EO REIN 390K C826 82P(CH) R827 REIP 270K 270K 8 ROSC

C876 R834

R824 R823

R827 C857

C826 C827 C836 TP487A
R431 R832 FP59 C431 CKD432 R424 D431 C401

CK114 C212

C839IC431

Q805 XL201

C201 26

R871 RR423

FP31 C165 R161 FP32

CK112R222 L103

C838 D832 C834

C828 C825

C833 R408

R406 FP67 R405 TP105A

FROM MECHANISM FLEXIBLE PWB P35 9-A

C844 R841

Q443 Q442 R442 RFLEXIBLE PWB C500

4 R461 R463 R462

5 C605

R204 C203

R414 C601

C210 R200

C511 14
CN451 C454 R733 R464 R732 R404

R904 C906 C907 R903

16 C15 20
FROM LCD/KEY PWB P34 3-A R767 R765

L204 C774 R207 C753

C909 C910 C902

C503 C773

D651 C357

1 R731

C911 Q711

C712 R761

C760 R758 R757 R720

R908 C758

C901 R723

R351 D351

C292 R292 LC731 L703 R715 C714 C713

R719 C724 L713 R729

R724 L714 C725

R728 R727

R768 DC492 D492 D495

C361 R291 C351

SW401 EJECT

L491 R762

D494 12

C734 C733

L454 D496 L457 C491

R492 L456

L453 L452

R716 Q721 R714

C703 R703 R730 R726
J703 REMOTE CONTROL/ EARPHONES

J701 OPTICAL/LINE IN

: Through-hole where the top, bottom and +B patterns are connected. : Through-hole where the top, bottom and hround patterns are connected. : Through-hole where the top and bottom patterns are connected. The numbers 1 to 15 are waveform numbers shown in page 37.
Figure 32 WIRING SIDE OF P.W.BOARD (1/4) 32

R905 C711 C721 C723

C205 C207

MAIN PWB-A (BOTTOM VIEW)

CONTROL TERMINAL GND TERMINAL,EXTENSION TERMINAL,+ EXTENSION BATTERY TERMINAL,+
BATTERY TERMINAL,+ TP206 C202 L202 R282 TP805 TP804
TP200 R281 R151 Q103 C151 L100 TP100

TP803 Q251 TP801 TP841

TP114 TP118

Check whether the audio signal line between IC701 and J701 is defective.
Is audio waveform observed on the pins 10 and 12 of IC701 ? Yes
Check whether the voltage of pins 13 to 15 of IC701 varies with the recording VOLUME +/ button operation. Check whether the soldering of IC701 is poor.
Is the output waveform output to the pin 8 of IC501 ? Yes Check the periphery of IC501 and the waveform of the pins 70 to 73 of IC201.
Check whether the pin 7 of IC501 and the pin 81 of IC201 are in H state.

FUNCTION TABLE OF IC

IC401 RH-iX0419AWZZ :System Microcomputer (IX0419AW) (1/2)
Pin No. 3 4-19* 20* 27* 34 35* 40 41* 44* 57* Port Name PE5 PE6 PE7 PD0-PD7 CVCC PC0 Vss PC1 PC2 PC3 PC4 PC5 PC6 PC7 PB0 PB1 TIOCC3 PB3 PB4 TIOCB4 PB6 PB7 PA0 TxD2 PA2 SCK2 P10 P11 P12/TCLKA TCLKB IRQ0 P15 IRQ1 P17 AVSS DA1 DA0 AN7 AN6 AN5 AN4 AN3 AN2 AN1 AN0 Vref AVCC MD0 MD1 OSC2 Terminal Name Input/Output SYRS _SYRD _SYWR SYD0-SYD7 CVCC PCLAT VSS _MCPGI _INPGI INPGCK RCPCNT TEST1 TEST0 JPNP OPICGA RFRCNT BUZOUT SGAIN DISCP MCMON RACLK RADAT CHGCNT DSPDAT DSPSTB DSPSCK PBOPON P11 CIN SPIN _DINT DISCPR ARQD P17 AVSS LDVAR PA0 RKCNG TEMP HKEY2 HKEY1 RKEY STDCK PLVDCI PLVBAT VREF AVCC MD0 MD1 OSC2 Output Output Output Input/Output Input Output Input Input Input Input/Output Input Input Input Output Output Output Output Output Output Output Output Output Output Output Output Output Output Input Input Input Input Input Output Output Output Input Input Input Input Input Input Input Input Input Input Input System LSI read enable output. System LSI write enable output. System LSI parallel data bus. Power supply of internal voltage drop circuit. Record audio IC data latch output. Ground potential. Microphone plug insertion detection input. Line/digital plug insertion detection. Line/digital plug type detection. Record circuit power control output. Test mode setting input 1. Test mode setting input 0. Kana conversion/Kana input existence/nonexistence discrimination. P.U detection sensitivity switching output. RF_LSI power supply ON/OFF control output. Beep sound pulse output. RF amp gain pllarity switching output. RF amp TE polarity switching output. Internal operation status monitor. Audio IC data clock output. Audio IC serial data output. Charge control. Unit indication data output. Unit display strobe output. Unit indication data clock output. Audio IC output stage control output. Reserve Track cross signal/focus drive detection. Spindle motor FG pulse detection input. System LSI interruption. Disc record inhibition switch input. Disk cap opens and closes detection/it is started and required. Reserve A/D and D/A converter ground potential. P.U. laser power setting output. Reserve Remote control button operation detection input. Ambient temperature detection input. Unit button operation detection input 2. Unit button operation detection input 1. Remote control button operation detection input. Lithium battery voltage detection input. DC IN voltage detection input. DC voltage detection input. A/D and D/A converter reference voltage. A/D and D/A converter positive power supply. Operation mode selection input 0. Operation mode selection input 1. Sub clock (not used). Function System LSI register selection output.

L100 L103 L171 L202 L204 L452 L453,454 L456~458 L491 L601,602 L603 L604 L608 L702,703 L704 L711 L712~714 L821 L841 L851 VPBNN100K0000 RCILC0353AFZZ RCILC0356AFZZ VPBNN100K0000 RCILC0353AFZZ RCILC0352AFZZ RCILC0353AFZZ RCILC0353AFZZ VRS-TV2AB330J RCILC0372AFZZ RCILC0358AFZZ RCILC0372AFZZ RCILC0356AFZZ RCILC0353AFZZ RCILC0352AFZZ RCILC0352AFZZ RCILC0353AFZZ RCILC0005AWZZ RCILC0358AFZZ RCILC0005AWZZ J J J J J J J J J J J J J J J J J J J J AC AB AC AC AB AB AB AB AA AC AC AC AC AB AB AB AB AF AC AF 10 H Tip Solid Induction,100mA 10 H 10 H Tip Solid Induction,100mA Tip Impeder,150mA Tip Solid Induction,100mA Tip Solid Induction,100mA 33 ohms,1/10W 22 H,Choke 4.7 H,Choke 22 H,Choke 10 H Tip Solid Induction,100mA Tip Impeder,150mA Tip Impeder,150mA Tip Solid Induction,100mA 10 H,Choke 4.7 H,Choke 10 H,Choke

VIBRATORS

XL201 XL401 RCRSC0028AFZZ RCRM-0039AWZZ J J AH Crystal,33.8688 MHz AF Ceramic,3.68 MHz

CAPACITORS

C100 C102,103 C106 C107 C108,109 C110 C111 C112 C113 C114 C121,122 C123,124 C130,131 C132,133 C151 C165 C171,172 C200 C201 C202 C203 C204 C205 C207 C209,210 C211 C212 C251,252 C253 C270 C272~274 C291 C292 C351 C353 C354 C357 C361 C401 C431 C451 C454 C491 C492 C493 C500 C501,502 C503 C505,506 C509,510 C511 C600 VCSAPR0JJ106M VCKYCY0JB105K VCKYCY0JB105K VCKYCZ1AB104K VCKYCY0JB105K VCKYCY1AB224K VCKYCY0JB105K VCKYCZ1AB104K VCKYCY0JB105K VCCCCZ1HH5R0C VCKYCZ1HB221K VCKYCZ1HB331K VCKYCZ1AB104K VCKYCY1AB224K VCKYCZ1CB103K VCKYCZ1AB333K RC-SZ0002AWZZ VCKYCY0JB105K VCSAPR0JJ106M VCSATK0JJ476M VCKYCZ1AB104K VCKYCY1AB474K VCKYCZ1AB104K VCKYCZ1AB104K VCKYCZ1AB104K VCCCCZ1HH5R0C VCCCCZ1HH8R0D VCKYCZ1AB104K VCKYCZ1CB103K VCKYCY0JB105K VCKYCZ1AB104K VCKYCY0JB105K VCKYCZ1CB103K VCCCCY1HH470J VCSAPR0JJ106M VCKYCZ1AB104K VCKYCZ1AB104K VCKYTV1HB393K VCKYCZ1AB104K VCKYCY1AB474K VCKYCY1EB223K VCKYCZ1HB222K VCKYTV1CB104K VCKYCY0JB105K VCKYCY1AB474K VCSAPR0JJ106M VCKYCZ1HB222K VCSAPR1AJ335M VCKYCZ1HB102K VCKYCY0JB105K VCKYCZ1AB104K RC-SZ0001AWZZ J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J J AD AC AC AB AC AB AC AB AC AB AB AB AB AB AB AB AD AC AD AD AB AC AB AB AB AB AB AB AB AC AB AC AB AA AD AB AB AB AB AC AB AB AA AC AC AD AB AD AB AC AB AG 10 F,6.3V,Electrolytic,Tantalum 1 F,6.3V 1 F,6.3V 0.1 F,10V 1 F,6.3V 0.22 F,10V 1 F,6.3V 0.1 F,10V 1 F,6.3V 5 pF (CH),50V 220 pF,50V 330 pF,50V 0.1 F,10V 0.22 F,10V 0.01 F,16V 0.033 F,10V 33 F,6.3V,Electrolytic 1 F,6.3V 10 F,6.3V,Electrolytic,Tantalum 47 F,6.3V,Electrolytic,Tantalum 0.1 F,10V 0.47 F,10V 0.1 F,10V 0.1 F,10V 0.1 F,10V 5 pF (CH),50V 8 pF (CH),50V 0.1 F,10V 0.01 F,16V 1 F,6.3V 0.1 F,10V 1 F,6.3V 0.01 F,16V 47 pF (CH),50V 10 F,6.3V,Electrolytic,Tantalum 0.1 F,10V 0.1 F,10V 0.039 F,50V 0.1 F,10V 0.47 F,10V 0.022 F,25V 0.0022 F,50V 0.1 F,16V 1 F,6.3V 0.47 F,10V 10 F,6.3V,Electrolytic,Tantalum 0.0022 F,50V 3.3 F,10V,Electrolytic,Tantalum 0.001 F,50V 1 F,6.3V 0.1 F,10V 22 F,6.3V,Electrolytic,Tantalum

P.W.B. ASSEMBLY (Not Replacement Item)
PWB-A PWB-B 92LPWB3664MDSS J 92LPWB3532KEYS J Main LCD/Key

OTHER SERVICE PARTS

UDSKM0001AFZZ 88GMMD-110 88GMMD-213A J J J AZ Recording Mini Disc BV High Reflection Disc MMD-110 (TEAC Test MD) BT Low Reflection Disc MMD-213A (TEAC Test MD)

BATTEY CHARGER PARTS

22 22- 1 22- 2 22- 3 22- 4 22- 5 22- 6 22- 7 22- 8 22- 9 RUNTZ0032AWM1 J GCABA1223AW01 J LHLDZ1283AWSA LHLDZ1285AWSA GLEGG0002AWZZ GLEGG0003AWZZ XEBSN20P05000 TLABM0107AWZZ TLABZ0855AWZZ J J J J J J J BL AE AF AB AB AA Battery Charger Front Cabinet Back Cabinet Unit (Not Replacement Unit) Remote Control Stand Stand Cushion A Cushion B Screw,25mm Label,Specifications Label,Caution

501x504x2 502

Figure 5 MD MECHANISM EXPLODED VIEW 5

MD MECHANISM

205 603x2

219 220

209 208

241 212

224x2 213

MAIN PWB 226

601 225x4

603x603

LCD PWB 604x4 603
Figure 6 CABINET EXPLODED VIEW 6

22-7 22-3 22-7 22-4

22-8 22-5x2 22-2

22-5x2

Figure 7 BATTERY CHARGER EXPLODED VIEW 7
PACKING OF THE SET (MD-MT877(S) FOR U.S.A. ONLY)
Setting position of switches and knobs Remote Control HOLD CANCEL
Operation Manual Connecting Cord, Optical Type
Quick Guide Carrying Case Sheet, Bubble SPAKZ0692AWZZ Battery Case Battery Label, Caution Remote Control
AC Adaptor Packing Add. SPAKA0284AWZZ Connecting Cord, RCA Type AC Adaptor Pad SPAKZ0630AWZZ Earphones Battey Charger

Battery Carrying Case

Polyethylene Bag, Battey Charger SSAKA0009AWZZ
Packing Case SPAKC1155AWZZ

:Not Replacement Item

COPYRIGHT
2001 BY SHARP CORPORATION

ALL RIGHTS RESERVED.

No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.
SHARP CORPORATION Communication Systems Group Quality & Reliability Control Center Higashihiroshima, Hiroshima 739-0192, Japan Printed in Japan
A0103-1267DSHAM SC LAG SL

GIZMOS

mini-disco
Is it time to trade in your taping gear for a minidisc setup?
By Aeve Baldwin and Tyson Schuetze

do the

is by far the most sophisticated, allowing users to download songs from a PC at 32 times real speed and adjust recording levels on the fly. It has countless other options but be forewarned: this model takes a little work and is not immediately user-friendly; you have to read the instructions, which are in English as well as Japanese. Sharps latest model (not tested), the MDMT877, also allows manual recording level adjustments on the fly.
these are not advised for night-time use unless you use prescription glasses or are Corey Haim.

Web Resources

For now, your best MiniDisc resources are online. Not only is the range of equipment much greater, but so is service; many employees in the large electronic stores are simply not yet equipped with the expertise, or motivation, to provide much help when it comes to MDs. We found the following three helpful: www.minidisco.com www.minidisc.org (Mini Disc Community Portal) www.minidisct.com (Mini Disc T-Station)

Permanent Record

What does the future hold for MiniDiscs? Will they suffer the same ignominious fate as their predecessors, the 8-track? Will its sole use be to keep your door propped open two years from now? Highly unlikely, because the MiniDiscs biggest weakness is also its greatest strength: as a stroll through your local record store will make readily apparent, there is a very limited selection of prerecorded MiniDisc music. The MD does not require that you discard your CD collection, but complements it with a high quality and easily manipulative format able

Talk This Way

All of the above models come complete with most of the items you need to get going, including the very necessary PC bundle to digitally download songs, headphones and a remote. They are also
Wherefore Art Thou, MiniDisc?
Take a walk through any electronics store in, say, Tokyo and you cant go a meter without seeing some type of MiniDisc gizmo: recorders, players, headphones, CD/MD/cassette stereos. Japan has wholeheartedly embraced the MiniDisc revolution. Its advantage over the CD, with which it shares similar (some say superior) sound quality, is its size (about 1/4 that of the CD) and its shock-resistant memory, making it the perfect choice for joggers and others on the move. Beam yourself to any similarly situated electronics store in, say, New York, and the MD options start to dry upor bewilder. The US has not quite yet embraced the MD and the best resources today are to be found, not surprisingly, on the web (see Web Resources).

Sony MZR700DPC

Model Behavior
Lets say youve decided to take the MiniDisc plunge. Your next dilemma is which model to purchase and what additional equipment will you need? Sony is the unquestionable market leader, but Sharp, Kenwood, Aiwa and Panasonic also make MiniDiscs. In an admittedly lessthan-scientifically-sound demo, our team of testers used only Sony models, though Jim Crawford, also of Minidisco.com, says they encourage people who do live recordings to get a Sharp over a Sony model as Sharp is better designed to manually adjust recording levels during live recording. We experimented with a recent Japanese model, the MZ-N1; the top-of-the-line US model, the MZR900DPC; and the one US model featuring a radio, the MZG750DPC. We discovered that the models have only slight differences and the quality of live recordings are most affected by the type of microphone you use. The quality of your enjoyment of your MD will be most affected by its ease of use; look for a model thats friendliest. Will you be using it predominantly to record live shows, or to replay recorded music? Factor in your needs. If you want an MD with a radio then the MZG750DPC is the only one with this option. The MZR900DPC offers the advantage of digital text dubbing, a backlit remote for viewing adjustments while recording live shows, a slimmer size, and an additional external battery pack. The Japanese model MZ-N1
NEXT ISSUE: The tapers strike back! What technology do tapers swear by in the 21st century?

To MD, or not to MD

Part of this is marketingMDs were originally pushed by Sony (its originator, circa 1992) as a replacement for CDs. The utter failure of this approach (and the savvy to know that it was still onto something) wised Sony up quickly, and it repositioned MDs as complements to CDs and cassette tapes. Compared to tapes theres no, well, comparison: the sound quality of an MD is infinitely better; theres less peripheral noise and, being digital, users can not only interface their MD systems with different components, recordings can also be easily edited. Dont want a track? Delete. Want to get rid of the dead space at the beginning of your live show recording? Delete again. Move a track? No problem. When compared with DATs, the picture becomes a little fuzzier. MD quality is not as high, though the price tag (you can get started for around $200 as opposed to the $600-$700 average cost of DAT startup) is much smaller and with DAT being a tape-based medium, theres still the inconvenience of fast forward, rewind and, eventually, tapes wear out. An early criticism of MDsthat the discs only have 80 minutes of recording time is no longer relevant as newer models have four different recording modes: mono, regular and two different MDLP settings that, like VCRs, allow users to record up to 160 minutes (LP2) or 320 minutes (LP4) with an 80-minute disk, in essence letting recorders stretch an 80-minute disk (with slight deterioration in sound quality rising with the higher settings). A final MD attribute is its durability. While its improbable that anyone has adequately tested Sonys assertion that a MiniDisc may be recorded a million times, Bob SHAR P MDM T877 Crawford, a musician and MiniDisc user as well as an employee of Minidisco.com, an online MD resource, reports that they have never experienced, or had a customer with the experience, of wearing out a disc.

Relix April/May 2002

Sony MZR900DPC
designed to be constantly adaptable. The one crucial extra that does not come standard is a microphone. There are many options but one of the most standard is the Sony T-Mic, a singlepoint stereo microphone that plugs directly into the MD player, so there are no cords to deal with. If you need to record under more stealth circumstances, the Sound Professionals (SPTFB2) offer a binaural microphone that has two pieces that fit into your ears. The actual mics are unnoticeable, although people may question why you have wires dangling from your lobes. Another James Bond-like product from Sound Professionals is the modular eyeglass microphone (SPEMC1), which fits nicely on the outside of a pair of sunglasses, although

to record any type of sound, analog or digital, be it live shows, CDs or mp3s. Bob Crawford reports from his recent attendance at the Las Vegas Consumer Electronics Show that new MD products were much in evidence, meaning that the industry itself is in it for the long haul and MDs wont soon become obsolete. Its versatility has already shown that it could make the first leapkeeping pace with mp3 playersand there is no reason to assume that it will not still be here in the futureperhaps to record the triumphant return of the 8-track.

MicSupply.com

Mics Stands Cables Power Decks Accessories Special Taper

Packages

www.micsupply.com

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