MD-MS722H/MS721H

SERVICE MANUAL

No. SX887MDMS722H

(Illustration: MD-MS722H)
MD-MS722H MD-MS721H(BL) MD-MS721H(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. Note for users in UK Recording and playback of any material may require consent which SHARP is unable to give. Please refer particularly to the provisions of Copyright Act 1956, the Dramatic and Musical Prefomers Protection Act 1956, the Preformers Protection Acts 1963 and 1972 and to any subsequent statutory enactments and orders.
(Illustration: MD-MS721H)

CONTENTS

Page SAFETY PRECAUTION FOR SERVICE MANUAL.... 2 SPECIFICATIONS...... 3 NAMES OF PARTS...... 4 OPERATION MANUAL...... 6 DISASSEMBLY...... 9 INSTALLING THE TOP CABINET..... 9 REMOVING AND REINSTALLING THE MAIN PARTS... 10 ADJUSTMENT...... 11 BLOCK DIAGRAM...... 27 SCHEMATIC DIAGRAM/WIRING SIDE OF P.W.BOARD.... 28 NOTES ON SCHEMATIC DIAGRAM..... 35 WAVEFORMS OF CD CIRCUIT..... 36 TROUBLE SHOOTING..... 37 FUNCTION TABLE OF IC..... 40 PARTS GUIDE/EXPLODED VIEW PACKING METHOD (MD-MS722H FOR UK ONLY)

SHARP CORPORATION

This document has been published to be used for after sales service only. The contents are subject to change without notice.
SAFETY PRECAUTION FOR SERVICE MANUAL
Precaution to be taken when replacing and servicing the Laser Pickup. The AEL (Accessible Emission Level) of Laser Power Output for this model is specified to be lower than Class I Requirements. However, the following precautions must be observed during servicing to protect your eyes against exposure to the laser beam. (1) When the cabinet has been removed, the power is turned on without a compact disc, and the Pickup is on a position outer than the lead-in position, the Laser will light for several seconds to detect a disc. Do not look into the Pickup Lens. (2) The Laser Power Output of the Pickup inside the unit and replacement service parts have already been adjusted prior to shipping. (3) No adjustment to the Laser Power should be attempted when replacing or servicing the Pickup. (4) Under no circumstances look directly into the Pickup Lens at any time. (5) CAUTION - Use of controls or adjustments, or performance of procedures other than those specified herein may result in hazardous radiation exposure. (MS722H Except for UK/MS721H) (MS722H For UK)
LASER KLASSE 1 LUOKAN 1 LASERLAITE KLASS 1 LASERAPPARAT
CAUTION - INVISIBLE LASER RADIATION WHEN OPEN AND INTERLOCKS DEFEATED AVOID EXPOSURE TO BEAM. VARNING - OSYNLIG LASERSTRLNING NR DENNA DEL R PPNAD OCH SPRRAR R URKOPPLADE. STRLEN R FARLIG. ADVARSEL - USYNLIG LASERSTRLING NR DEKSEL PNES OG SIKKERHEDSLS BRYTES. UNNG EKSPONERING FOR STRLEN. VARO! AVATTAESSA JA SUOJALUKITUS OHITETTAESSA OLET ALTTIINA NKYMTN LASERSTEILYLLE. L KATSO STEESEN. VARNING - OSYNLIG LASERSTRLING NR DENNA DEL R PPNAD OCH SPRREN R URKOPPLAD. BETRAKTA EJ STRLEN. ADVARSEL - USYNLIG LASERSTRLING VED BNING NR SIKKERHEDSAFBRYDERE ER UDE AF FUNKTION. UNDG UDSETTELSE FOR STRLING.

Laser Diode Properties Material: GaAIAs Wavelength: 785 nm Pulse time: Read mode: 0.8 mW Continuous Write mode: max 10 mW 0.5S min cycle 1.5S Repetition
VAROITUS! LAITTEEN KYTTMINEN MUULLA KUIN TSS KYTTOHJEESSA MAINITULLA TAVALLA SAATTAA ALTISTAA KYTTJN TURVALLISUUSLUOKAN 1 YLITTVLLE NKYMTTMLLE LASERSTEILYLLE. VARNING - OM APPARATEN ANVNDS P ANNAT STT N I DENNA BRUKSANVISNING SPECIFICERAS. KAN ANVNDAREN UTSTTAS FR OSYNLIG LASERSTRLNING, SOM VERSKRIDER GRNSEN FR LASERKLASS 1.

VARO ! VARNING!

Avattaessa ja suojalukitus ohitettaessa olet alttiina nkymttmlle lasersteilylle. l katso steeseen. Osynlig laserstralning nr denna del r ppnad och sprren r urkopplad. Betrakta ej strlen.
Precaution to be taken when replacing and servicing the laser pickup. The following precautions must be observed during servicing to protect your eyesagainst exposure to the laser. Warning of possible eye damage when repairing: If the AC adaptor or batteries are connected when the top houising (disc cover) of the unit is removed, and the PLAY key is pressed, the laser will light up during docus access (2-3 seconds). (Fig. 2-1) During the operation, the laser will lesk from the opening btween the magnetic head and the mechanical chassis (Fig. 2-2). In order to protect your eyes, you most not look at the laser durnd repaor. Before repaoring be sure to disconnect the AC adaptor and remove the batteries.

Magnet head

Magnet Head Lasar Beam

Mechanism Chassis

Optical pick-up

Disc motor

Main PWB Optical Pick-Up

Figure 2-1

Disc cover

Figure 2-2 2

FOR A COMPLETE DESCRIPTION OF THE OPERATION OF THIS UNIT, PLEASE REFER TO THE OPERATION MANUAL.

SPECIFICATIONS

General
Power source: (MS722H Except for UK/MS721H) DC 3.6 V (rechargeable lithium-ion battery x 1) DC 5 V (AC adaptor) AC 220 - 230V, 50/60 Hz DC 3.4V: Battery case (commercially available, "AA" size, alkaline battery x 1) DC 4.5V: Separately available car adaptor, AD-CA20X (for cars with a 12-24V DC negative earth electrical system) DC 3.6 V (rechargeable lithium-ion battery x 1) DC 5 V (AC adaptor) AC 230 - 240V, 50/60 Hz DC 3.4V: Battery case (commercially available, "AA" size, alkaline battery x 1) DC 4.5V: Separately available car adaptor, AD-CA20X (for cars with a 12-24V DC negative earth electrical system) 7 W (AC adaptor) RMS; 20 mW (10 mW + 10mW) (0.2% T.H.D.) Approx. 3 hours (When using the AC adaptor included with the unit)
When using one, commerically available, high capacity, "AA" size, alkaline batteries (in the battry case) Continuous recording: Approx. 3 hours Continuous play: Approx. 6 hours When using one, commercially available, high capacity, "AA" size batteries with the rechargeable battery (fully charged) Continuous recording: Approx. 11 hours Continuous play: Approx. 16 hours

SYNC REC

1 RANDOM
MD-MS721H Remote control unit 1. Synchro Recording Indicator 2. Character/Time Information Indicator 3. Record Indicator 4. Repeat Indicator: 5. Random Indicator 6. Disc Mode Indicator 7. Total Track Number Display 8. Track Number Indicator 9. Battery Indicator: 10. Earphones Socket 11. Display/Volume Shuttle Switch 12. Hold Switch 13. Play/Pause/Fast Reverse/ Fast Forward Shuttle Switch 14. Stop/Power Off/Bass/Play Mode Shuttle Switch Main unit 1. Monaural Long-Play Mode Indicator 2. Record Indicator 3. Level Meter 4. Repeat Indicator: 5. TOC Indocator 6. Battery Indicator: 7. Random Indicator 8. Track Number Indicator 9. Character/Time Information Indicator 10. Synchro Recording Indicator 11. Disc Mode Indicator 12. Disc Name Indicator 13. Track Name Indicator 14. Remaining Recording Time Indicator 15. Total Track Number Display 16. Mode/Insert Button 17. Record/Track Mark Button 18. Fast Reverse/Recording Level Control/ Cursor Button: 19. Play/Pause Button: 20. Fast Forward/Recording Level Control/ Cursor Button: 21. Display/Lowercase Characters Button 22. Volume/Name Select Buttons: -23. Volume/Name Select Buttons: + 24. Bass/Delete Button 25. Character Button 26. Enter/Fast Play/Synchro Button 27. Edit/Auto Mark/Time Mark Button 28. Handstrap Attachment Eye 29. Stop/Power Off Button: /:OFF 30. Eject Lever 31. Optical/Line Input Socket 32. Microphone Input Socket 33. Hold Switch 34. Battery Case Connection Terminals 35. Earphones Socket 36. 5V DC Input Socket 37. Rechargeable Lithium-lon Battery Compartment

POWER SOURCE

CONVENIENT OPERATION OF THE UNIT
Checking the remaining amount of battery charge
Notes: The remaining amount of battery charge is shown by the battery indicator ( ) during operation.

Battery indicator

This unit can be used with 4 different power sources: a rechargeable battery, an AC adaptor, a battery case, and a separately available car adaptor (AD-CA20X).
Rechargeable battery power

If trouble occurs

4. Plug the AC adaptor back into the AC socket and retry the operation.
When this product is subjected to strong external interference (mechanical shock, excessive static electricity, abnormal supply voltage due to lightning, etc.) or if it is operated incorrectly, it may malfunction. If such a problem occurs, do the following: 1. Unplug the AC adaptor from the AC socket. 2. Remove the battery. 3. Leave the unit completely unpowered for approximately 30 seconds.
If strange sounds, smell or smoke come out of the unit or an object is dropped into the unit, remove the AC adaptor from the AC socket immediately and contact an authorised SHARP service centre.

ERROR MESSAGES

Error messages

BATT EMPTY (Lo BATT)

Meaning The battery run down.
BLANK DISC (BLANK) Can't COPY (Not REC) Change the stop position of the track and then try editing it. Re-record or replace it with another recordable disc.

Nothing is recorded.

Can't EDIT
No copy can be made because of the SCMS copyright system. A track cannot be edited.
Remedy Charge the rechargeable battery or replace the alkaline battery (or use the AC adaptor for power). Replace the disc with a recorded disc. Record using the analogue cable.

Can't REC (Not REC)

Can't WRITE
Recording cannot be performed correctly due to vibration or shock in the unit. Editing is impossible. The disc is scratched.

DEFECT (DEFECT)

Poor connection of the digital cable. Reload the disc or replace it.
Check the number of tracks. If the sound you hear is not right, try recording again. Replace the disc with another recordable disc. Connect the digital cable securely.
Din UNLOCK (UNLOCK) DISC ERROR (E-DISC)

The disc is damaged.

DISC FULL
The disc is out of recording space.
HOLD (HOLD) LOCKED LOCK ERROR NO DISC
The unit is in the safety mode.
To have it repaired, go to the distributor where you purchased the unit. Turn off the power, and wait for a while. Replace it with another recorded disc. Replace it with another recordable disc. Edit the track with the device on which it was recorded. Replace it with another recorded disc. Erase all of the signal errors, and then try recording again. A disc which contains non-music data cannot be played. Replace it with another recorded disc.

6. RESULT2 Mode

The measurement value and set value of adjustment items for AUTO2 and MANUAL 2 are displayed. If the VOL UP button is pressed during setting indication, the setting increases. If the VOL DOWN button is pressed, the setting reduces. And then the new setting is stored in the RAM. When the VOL UP/DOWN button is held down, the setting changes continuously, one cycle being 100 ms. If the STOP button is pressed during RESULT2 menu or measurement value indication or set value indication, the state is changed to the TEST mode STOOP state.
When the STOP button is pressed while the TEST-PLAY menu appears, or in TEST-PLAY or continuous playback mode, the mode changes to the TEST mode stop state. When the PLAY button is pressed while the TEST-PLAY menu appears,continuous playback is initiated from the current pickup position. Whenever the DISP button is pressed in the TEST-PLAY mode, the address changes as follows. 0050 03C08A Whenever the BASS key is pressed in the TEST-PLAY mode, the digit which is changed by the SKIP UP/DOWN button changes as follows. 0050 When the SKIP UP button is pressed in the TEST-PLAY mode, the digit of address specified by the BASS button is set to +1h. (0 to F) When the SKIP DOWN button is pressed in the TEST-PLAY mode, the digit of address specified by the BASS button is set to -1h. (0 to F) * When the SKIP UP/DOWN button is held down, the setting changes continuously, one cycle being 100 ms. When the BASS button is pressed in the continuous playback mode, the number of jump lines changes as follows. * After the number of jump lines is indicated for one second, the address indication is restored. [ T R _ ] When the SKIP UP button is pressed in the continuous playback mode, the specified number of lines is jumped in the FWD direction. When the SKIP DOWN button is pressed in the continuous playback mode, the specified number of lines is jumped in the REV direction. * When the SKIP UP/DOWN button is held down, jump is repeated every approx. 100 ms.
Whenever the DISP button is pressed in the continuous playback mode, the indication changes as follows. * Pit section Continuous playback (SUBQ address indication) [ S Q ] | Continuous playback (C1 error indication) [ C E ] | Continuous playback (SUBQ address indication) [ S Q ] * Groove section Continuous playback (ADIP address indication) [ A P ] | Continuous playback (C1 error indication) [ C E ] | Continuous playback (ADIP error indication) [ A E ] | Continuous playback (ADIP address indication) [ A P ]

13. INNER Mode

when the STOP button is pressed on the INNER menu (SQ______ ), the state is changed to the TEST mode STOP state. : Address
EEPROM (IC402) writing procedure
1. Procedure to replace EE-PROM and write initial value of microcomputer in EEPROM
(1) (2) (3) (4) (5) Replace EEPROM. Deprive EEPROM of protection (connect the pins 8 and 6 of IC402). Refer to the latest EEPROM data list. Press the Display/Lower-case Character button, Enter/Synchro button and Play/Pause button to start the test mode. Version display [Ver. ] Destination EEPROM version (C ~ Z) Microcomputer ROM version The whole LCD lights. Test mode stop state [ T E S T ] Press the "BASS" button, and press twice the "SKIP DOWN" button. [ E E P R O M ] Perform the operation to display "EEPROM SETTING MODE CHART", compare the EEPROM DATA LIST with the display, and set according to the EEPROM DATA LIST with the VOL UP or VOL DOWN key. Set the temperature reference. (Refer to the Temperature Reference Setting Method.) Set according to the EEPROM DATA LIST. Press the Stop button. [ T E S T ] Press the Stop button. After data is written in EEPROM, turn off power. Restore protection of EEPROM (Disconnect connection made in Step (2) above).
(6) (7) (8) (9) (10) (11) (12) (13) (14) (15)
2. Temperature reference setting method
[1] Measurement, calculation and setting procedure (1) Set the TEST mode. Set TEST 1, 0 = '01', and turn on power (or set PLAY ON in standby state). (2) Start the EEPROM mode 'Temp' menu. Key operation in order of BASS, SKIP-DOWN x 2 times, PLAY, PLAY in the test mode STOP state. 'TM$$%%' is displayed. ($$= Temperature code, %% = Temperature reference) (3) Once press SKIP-UP, and determine the displayed microcomputer TEMP input AD value.
'TPin##' is displayed. (## = TEMP input AD value)
(4) At the ambient temperature, determine the temperature corrected value from the temperature measurement value correction table. (5) Determine the temperature reference, using the following formula.
Temperature reference = Microcomputer TEMP input AD value + Temperature corrected value When data is written into EEPROM, the value shown adove is recorded at the specified address.
[2] Temperature measurement value correction table Ambient temperature + 9 C ~ +11 C +12 C ~ +14 C +15oC ~ +16oC +17oC ~ +19oC +20oC ~ +22oC +23oC ~ +24oC +25oC ~ +27oC +28oC ~ +30oC +31oC ~ +33oC

o o o o

Temperature correction - 05h - 04h - 03h - 02h - 01h 00h + 01h + 02h + 03h
Center temperature + 10.0oC + 12.7oC + 15.4oC + 18.2oC + 20.9oC + 23.6oC + 26.3oC + 29.0oC + 31.8oC
[3] Power IC VREF feed control output After automatic adjustment the temperature code is read. If it is within the following range, OK. Ambient temperature - 9 C ~ +10 C + 3 C ~ +21 C +15oC ~ +33oC +26oC ~ +43oC

: Preadjustment value check menu
: ATT adjustment value check menu
* When the [STOP] key is pressed in specific menu, the "TEST MODE STOP" state is set. *" " represent the adjustment number as follows. : Innermost periphery move : ABEF offset tentative measurement : RF side focus gain coarse adjustment : Focus ATT tentative setting : RF side bit section tracking gain adjustment : COUT level setting for pit section adjustment : External periphery move : RF side groove section tracking gain adjustment : COUT level setting for groove section adjustment : RF side TCRS gain adjustment : Tracking ATT initial setting : RF side focus gain minor adjustment : Focus ATT initial setting : S gain "High" ABEF offset measurement : TCRS offset measurement : S gain "Low" ABEF offset measurement

Din Mon

: Digital input signal monitor menu
: Error history display menu

NORMAL

: Test mode normal playback menu

EEPROM

: EEPROM setting menu
: INNER switch position measurement menu
* When the [STOP] key is pressed in specific menu, the "TEST MODE STOP" state is set. * When the [PLAY] key operation is performed in the specific menu, the operation of this menu is executed.

ATT Auto Adjustment

Pre-Manual Adjustment MANU1
: Pre-Manual Adjustment menu PLAY
SKIP UP SKIP DOWN : Temperature code display $ $ : Temperature code : A signal offset (AINO) tentative measurement : Measurement value : B signal offset (BINO) tentative measurement : Measurement value SKIP DOWN : E signal offset (EINO) tentative measurement : Measurement value SKIP DOWN : F signal offset (FINO) tentative measurement : Measurement value SKIP DOWN
: ATT Autoadjustment menu

SKIP UP SKIP DOWN

: During ATT autoadjustment

Adjustment error

Normal end
: ATT adjustment error (adjustment value output)

ADJ. OK

: ATT adjustment normal end (adjustment value output)

SQ#### AP####

: Continuous playback (high reflection) : Continuous playback (low reflection)
: Laser On (Play Power) : RF side focus gain coarse adjustment : Gain setting
: A-ATT (focus) tentative setting : ATT setting : B-ATT (focus) tentative setting : ATT setting SKIP DOWN : RF side pit section tracking gain adjustment : Gain setting SKIP DOWN : Pit section adjustment COUT level setting : COUT level setting
* When the [STOP] key is pressed in specific menu, the "TEST MODE STOP" state is set. *" " represent the adjustment number as follows. : Innermost periphery move : Pit section tracking ATT setting : Pit section focus ATT setting : External periphery move (low reflection only) : TCRS ATT setting (low reflection only) : Groove section tracking ATT setting (low reflection only) : Groove section focus ATT setting (low reflection only)

AdAd5 0

* In the start address set state the value of selection digit changes in the range of "0h to Fh" when the [SKIP UP/DOWN] key is pressed * In the continuous playback state the number of jump lines changes as follows shown the [BASS] key is pressed. 1 (initial value) 10 384
* In the start address set state the value of selection digit changes in the range of 0h to Fh when the [SKIP UP/DOWN] key 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 [VOL UP/DOWN] key is pressed.

1TR 4TR

* When the [SKIP UP] key is pressed in the continued playback mode, jump of specified number of lines occurs in the external periphery direction. If the key is held down jump occurs continuously (100 ms cycle). * When the [SKIP DOWN]key is pressed in the continuous playback mode, jump of specified number of lines occurs in the internal periphery direction. If the key is held down, jump occurs continuously (100 ms cycle).
Inner Switch Position Measurement

Error History Display

Error history clear
: Error history display menu PLAY

: Error history clear

: Continuous playback (pit section) # # # # : Address * When the [STOP] key is pressed in specific menu, the "TEST MODE STOP" state is set.

SQ####

Error history display
Test Mode Normal Playback
: Error history 0 display : Error code : Error history 1 display : Error code
: TEST mode normal playback menu
: Continuous playback @@@@@: Mode and address display * When the [STOP] key is pressed in specific menu, the "TEST MODE STOP" state is set.
: Error history 2 display : Error code : Error history 3 display : Error code : Error history 4 display : Error code SKIP DOWN : Error history 5 display : Error code SKIP DOWN : Error history 6 display : Error code
Digital Input Signal Monitor

DinMon

: Digital input single monitor menu
: FS code, C bit data display : Address : Control code : Category code
: Error history 7 display : Error code

* When the [STOP] key is pressed in specific menu, the "TEST MODE STOP" state is set. * When the [DISP] key 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] key is pressed. 1st digit (initial value) 2nd digit

P-MODE P-MODE

* In the specific state the setting changes in the range of "0h to Fh" when the [VOL UP/DOWN] key is pressed.

Digital EQ Setting

Control Setting CTRL
: Control setting menu PLAY

RC1 SYC

P-MODE

3,4 1,12

LIFT MOTOR

VCC 1 2-5, 7-12, 14-23

IC651 MOTOR DRIVER LB1930M +2.5 OPTICAL IN UNIT IC202 16BIT D-RAM IX2723AF

J701 +2.8 DIGITAL INPUT

+2.8 +4.5

J701 LINE INPUT

VCC 10,12 8,11 VCC VEE
IC351 HEAD DRIVER 74ACT02T

IC701 AUDIO AMP IR3R54N

RIPPLE FILTER Q721 +4.5
26-30, 32-37, 39-46 57,66 7-12, 15,17 5,52,53 25-30,40 3,5-9,17-82-84,86 89-100 55,58 59, 70-74
J702 MIC IN (READY FOR PLUG-IN POWER)
LASER IC501 3,6 AD/DA CONVERTER 19,20 AK4519VF

VCC 20

4 IC871 TK71345M 4.5V REGULATOR
OPIC IC201 ENDEC LSI LR37811 +2.5 ICTK71225M 2.5V REGULATOR

13,14 24,42

IC101 RF SIGNAL PROCESSOR IR3R55

IC703 AUDIO AMP IR3R54N

VEE 17
F VDD +2.IC200 2V REGULATOR 3 62FP2002 +2.8 2.5
2,15-17, 19-22 1,20-30, 76,93-95

J703 HEAD PHONES LINE

Figure 27 BLOCK DIAGRAM

AVCC +2.5

IC601 PWM DRIVER 17A39TD

VCC 35 6,8 VM

1,6 19,20

24,26 29,31

M901 SPINDLE MOTOR
IC901 3-PHASE BRUSHLESS DRIVER BA6965AF IC401 SYSTEM MICROCOMPUTER IX2772AF

14-16 42,48

+6~8 +2.5

J703 REMOTE CONTORL

IC850 POWER DRIVE IR3M09N VCC
OVER VOLTAGE, REVERSE-CONNECTION PROTECTION CIRCUIT
+2.5 IC402 EEPROM S29L294A
69, 72, 73, 83, 84 9, 10, 13

J801 DC IN (4~5.5V)

M902 SLED MOTOR
IC820 POWER DRIVE IR3M09N VCC
RECHARGEABLE BATTERY (2.9~4.1V) DISPLAY UNIT +2.35 OPERATION UNIT

SERIES REGULATOR

BATTERY CASE (BOOSTER CIRCUIT BUILT-IN)

(3.4V)

P28 P29 P30

MAIN PWB-A

PLAYBACK SIGNAL RECORD SIGNAL
C112 0.033 C111 0.0033 CK112 C110 0.22 C109 1/16
+B C107 0.012 TP139 C106 0.22 R106 56K TP211 C204 0.47 TP208

C201 1/16

DGND VD

L201 22H VCC2R5V

2324 C508 1

P487 +B DCNT1 R500 4.7

C507 10/6.3 C774 1

IC402 S29L294A EE-PROM

TP407 PHOLD R413 1K R414 1K R411 100K 1 CS VCC GND VCC +B

IC771 TK71225M

1 L771 47H C771 47/6.3 L862 47H CC 0

C773 0.22

2.5V REGULATOR

TP771 C772 47/6.3

2 SK NC 7 TP411 RDO PRTC 6 10K TPDI GND 5 TP409 DSPSTB DSPDAT

IC404 7SH00FU NAND GATE

R415 1K

DSPSCK

SW1 R406 PCNT2 100K TP406 R405 10K TP405 XRT FOK SENSE TP415 START TP401 C401 0.1 LDVAR TEMP HKEY2 HKEY1 INN DCI DRY DINT TP414

EJECT SPIN CIN

C869 47/6.3
DSPSTB DSPDAT RMDAT VSS PDCNT

R401 100K

RCAULT MCPGIN INPGIN INPGCK RCPCNT2
R854 0.2M R853 330K C853 10P

D836 1SS372

PBLAT REC PBOPON RPLAY KHOLD BUZOUT MD0 MD1 INNSW WDTOVF MD2 RESET NMI STBY VCC XTAL EXTAL VSS STOP PLAY EMPH0 (JOG0) (JOG1)

R425 22K

R424 22K

DISCPR DISCIN SPIN CIN

EJSW HDON XRST FOK SENSE DCNT1M SWPUP IC401 MCMON IX2772AF START MICROCOMPUTER VSS AVSS LDVAR TEMP HKEY2 HKEY1 RKEY PLVINN PLVDCI PLVDRY Vref AVCC DINT

100 CKSTP 99 PCNTVCC

+B C862 C836 1/16 0.1

L861 4.7H

C864 47/6.3 D8 F1 D852 F1J2F C857 10(CH) 5 6

EAIN+ EAINEAOU

C837 0.1
R855 C859 270K POW 0.VREF R860 33K 2 DB R858 R851 100K 10K

TP400 TP403

R426 22K

R423 22K

100K R852 JOG1 JOG0 C851 68P (CH)
MCLK PWDA PWAD AINL VCML VCMR AINR VRAD VRDA

C500 10/6.3

1 R821 680K RESET R407 10K 1 H 2

F T T+ 01 C602 C1

1 OUT VSS VDD 3

R824 390K

C822 8P

SW402 HOLD

R826 220K

R408 100K

D431 1SS361

IC431 S80820LN RESET

3 R822 3.3M 4 R823 100K 5 C821 68P (CH) 6
L(CH) D821 F10J2E IC821 CPH3303

C826 100/6.3

C825 3.3/10

C605 0.1

IC200 62FP2002 2V REGULATOR
The numbers 1 to 18 are waveform numbers shown in page 36.
Figure 29 SCHEMATIC DIAGRAM (2/4) 29

C503 3.3/10

GND VREF DB EAIN+ EAINEAOU GND

SDTO SCLK LRCK

R458 56K
DADATA ADDATA DFCK BCLK LRCK DIN ADPON DAPON OPTCNT
JOG0 JOG1 R460 47K R455 R456 R457 HKEY2 R459 5.6K 8.2K 18K 47K HSTOP
FLEXIBLE PWB DADATA ADDATA DFCK BCLK LRCK DIN ADPON DAPON OPTCNT HREC TP451 TP452 TP453 TP454 TP455 TP456 TP457 TP458 TP459 TP461 TP462 TP463 TP464 TP465 TP466 TP467 TP8 9

KEY FLEXIBLE PWB UNIT

1 DISPLAY VOL DOWN REC EDIT VCC P-MODE JOG 1 JOG 2 GND BASS ENTER STOP SKIP DOWN SKIP UP PLAY VOL UP CHARACTER 18

MS722H ONLY

JOG0 JOG1 R460 47K R455 R456 R457 HKEY2 R459 5.6K 8.2K 18K 47K HSTOP HPLAY HKEY1 R451 R452 5.6K 8.2K R453 18K R454 56K

IC202 X2723AF

C481 0.1 DSPSTB DSPSCK DSPDAT
TP485 TP484 TP483 TP482 TP481 CN482

1 FLEXIBLE PWB

LCD DRIVER
L710 0.47H R72 8.2K R719 8.2K 8

LIHP AGND

RC501 C504 0.0022 3.3/10 C502 0.0022 R502 470

C509 2.2 C510 2.9

ROUT RIHP LOUT
R712 5.6K R711 C734 5.6K C733 0.1/16 0.1/16
0.001 IC501 C505 AK4519VF 0.001 AD/DA CONVERTER

CTP500

C701 10/6.3
C703 0.01 R703 120K R701 100

C508 1

C726 3.3/10

R727 8.2K R723

R769 39K

C757 0.68

C758 3.3/10

C756 0.68

R500 4.7
R762 +B 3.6K CC761 R754 R270K 3.6K

R770 39K

R728 MCPGIN 1K C731 0.22 R729 2.7K C721 3.3/10 R730 2.7K C722 3.3/10 C735 0.001

R726 39K 6.8K

C725 3.3/10

L500 22H

C702 10/6.3

C727 1

R702 100

C711 100P (CH)

IR3R54N AUDIO AMP.
TPTPVCC TPVout C713 R713 GND 1 10K TPL702 TP702 L-CH C712 L 2 L703 TP703 R-CH 100P(CH) R 3 TP704 GND INPGCK 4 R715 TPL704 100K R714 Q721 INPGIN R716 100K 2SC4213 B 10K CRC715 0.1

R717 1K Q711 RN1444 A 2

J701 OPTICAL /LINE IN

R724 6.8K TP714

L714 TP713 L713

J702 MIC IN

L-ch R-ch C723 0.001 C736 100

+B C773 0.22

5 L771 47H

C775 0.01

IC703 IR3R54N AUDIO AMP.

R756 27K R757 27K

L712 TP711

C724 0.001

C759 0.027

C760 0.027

C771 47/6.3 L862 47H C868 1
R753 120K +B R768 1K CL752 47H CC755 0.01
L491 4.7H KEY PLAY R765 27
CTP772 RESET PBMUTE C864 47/6.3 BEEP RCAULT AUSCLK AUDATA PBAULT

L751 47H

C766 0.22 R767 1K

L-CH R-CH

RKEY RPLAY
L871 0.47H RDATA Q891 2SA17457 Q892 2SA17457 R893 1K

C451 0.001

R801 R800 2.2K 560 R810 015Z5.1Y 6.8K D802

C861 1/16 D861 F10J2E

RCPCNT2

RR891 TP807 2.2K

IC871 TK71345M 4.5V REGULATOR (ON/OFF)

4 D871 RB521S1

D493 015Z5.1Y
D492 15AZ7.5Y D491 015Z5.1Y

R764 82

RR763 82
TP726 TP725 C491 L456 0.1/16 TP729 TP722 L452 TP724 L454 TP723 L453 TP721 R492 RDATA TP727 1K L457 TP728

D494 15AZ7.5Y

J703 REMOTE CONTROL HEADPHONES

C765 0.22

C752 0.082 C751 0.082

R815 56K

VCC1 TP805 C800 R2.2K R802 4.7K 4 TP801 TP802

J801 DC IN 3

D852 F1J2F D836 1SS372 R854 0.2M R853 330K C853 10P C857 10(CH)

MD-MS721H

TO MAIN PWB P- B
Figure 34 WIRING OF P.W.BOARD (3/3) 34
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 micro-micro-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 SW402 SW901 SW902 EJECT HOLD DISC IN DISC PROTECT DESCRIPTION POSITION OFFON OFFON OFFON OFFON

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

TOP VIEW TOP VIEW 2SA17457 2SC4213B 2SK2909 2SK2911 DTA114YE DTA144TE DTC144TE RN1444A TOP VIEW

C (D) (2)

TOP VIEW

1SS361

015Z5.1Y 015AZ7.5Y 1SS368 RB521S30

SB0209CP 1SS372

F10J2E RB491D SB10015C
Figure 35 TYPES OF TRANSISTORS AND DIODES

WAVEFORMS OF MD CIRCUIT

Stopped CH1=1mV DC 10:1

CH2=500mV DC 10:1

CH3=5V DC 10:1

TP208 (FEOUT)

1994 / 12 / 15 22:54:19 CH4=2V 50ms/div DC 10:1 (50ms/div) NORM:200kS / s

Stopped CH1=2V DC 10:1

CH2=2V DC 10:1

CH3=2V DC 10:1

1994 / 12 / 16 00:24:17 CH4=2V 50us/div DC 10:1 (50us/div) NORM:100MS / s

Stopped CH1=1V DC 10:1

CH3=500mV DC 10:1
1994 / 12 / 16 01:03:40 2ms/div (2ms/div) ENV

TP201 (EFM)

TP122 (F+)

TP210 (TEOUT)

CK205 (SENSE)

TP209 (TOTAL)

CK204 (FOK)
=Offset= CH1 : 0.00V CH2 : 0.000V CH3 : 0.00V CH4 : 0.00V =Record Length= Main : 10K Zoom : 10K =Trigger= Mode : NORMAL Type : EDGE CH4 Detay : 0.0ns Hold OFF : MINIMUM
=Filter= Smoothiing : OFF BW : FULL

CH1 CH2 CH3 CH4

=Offset= : 0.00V : 0.00V : 0.00V : 0.00V
=Record Length= Main : 5K Zoom : 5K
=Trigger= Mode : AUTO Type : EDGE CH3 Detay : 0.0ns Hold OFF : MINIMUM
=Offset= CH1 : 0.00V CH2 : 0.00V CH3 : 0.000V CH4 : 0.00V

PRICE RANK AD AK AH AK AF AF AK AF AF AE AF AE AE AC AK AE AE AC AC AU AQ AY AY AB AB AB AQ AR AC AD AC AB AB AB AB AB AB AD AC AA AA AA AB AC AB AA
Cover,LCD [MS722H Only] Decoration Plate [MS722H] Decoration Plate [MS721H] Decoration Ring A [MS722H Only] Decoration Ring B [MS722H Only] Knob,Function A [MS722H] Knob,Function A [MS721H] Knob,Function B [MS722H] Knob,Function B [MS721H] Knob,Function C [MS722H] Knob,Function C [MS721H] Knob,Function D [MS722H Only] Knob,Rec [MS722H] Knob,Rec [MS721H] Knob,Jog [MS722H Only] Knob,FF/FR [MS722H Only] Knob,Play [MS722H Only] Sheet,Transparent Plate [MS722H] Sheet,Transparent Plate [MS721H] Key Flexible PWB Assy [MS722H] Key Flexible PWB Assy [MS721H] LCD [MS722H] LCD [MS721H] Spacer [MS721H Only] Sheet,Switch,B [MS722H Only] Cushion,Mechanism B [MS722H Only] Alumi Decoration Plate [MS721H (S)] Alumi Decoration Plate [MS721H (BL)] Holder,LCD [MS721H Only] Sheet,Knob [MS721H Only] Sheet,Eject Bracket Cushion A [MS721H Only] Cushion B [MS721H Only] Cushion C [MS721H Only] Felt [MS721H Only] Sheet,LCD Flexible [MS722H Only] Sheet,Volume Knob [MS721H Only] Caution,Laser Label,Laser Screw,1.41.5mm Screw,1.22.5mm [MS721H Only] Screw,1.42mm Screw,1.72.5mm Screw,1.42.5mm Screw,1.42mm Screw,1.42.0mm 18
TINSZ1385AFZZ UBAGC0076AFSA SSAKP0116AFZZ TCADS0085AFZZ SPAKZ0475AFZZ SPAKZ0498AFZZ SPAKZ0509AFZZ J J J J J J J

PRICE RANK AP AH AD AD

Operation Manual [MS721H] Carrying Case Paper Bag,Unit Service Card [MS722H for UK Only] AD Spacer,Operation Manual [MS722H for UK Only] Packing Add.,Unit Packing Add.,Unit
P.W.B. ASSEMBLY (Not Replacement Item)
PWB-A DCYO-3077AF93 J Main

OTHER SERVICE PARTS

UDSKM0001AFZZ 88GMMD-110 88GMMD-212 J J J AZ Recording Mini Disc BV High Reflection Disc MMD-110 (TEAC Test MD) BU Low Reflection Disc MMD-212 (TEAC Test MD)
ACCESSORIES/PACKING PARTS
3 GCASZ0086AFSA J QCNWG0382AFZZ J RADPA7486AFZZ J AX Battery Case AK Connecting Cord,RCA Type AY AC Adaptor [MS722H Except for UK/ MS721H] BC AC Adaptor [MS722H for UK] AR Headphones AD Cushion,Headphones BC Remote Control AD Packing Add. AL Packing Case [MS722H] AL Packing Case [MS721H (S)] AL Packing Case [MS721H (BL)] AD Pad,AC Adaptor BG Rechargeable,Battery AG Strap AQ Connecting Cord,Optical Type AG Operation Manual [MS722H for UK] AR Operation Manual [MS722H Except for UK]

4- 12 12

RADPA8487AFZZ RPHOH0176AFZZ PCAPH8107AFZZ RRMCW0038AFSA SPAKA2679AFZZ SPAKC6671AFZZ SPAKC6683AFZZ SPAKC6684AFZZ SPAKZ0481AFZZ UBATI0068AFSA UBNDT0083AFSA QCNWG0422AFZZ TINSE1604AFZZ TINSZ1380AFZZ
J J J J J J J J J J J J J J
8-2 (SW901) 8-3 (SW902) 503x2 M902

505 502x18 MM903 11

515 27

3 518x508 511x2

Figure 5 MD MECHANISM EXPLODED VIEW 5