Service manual

ManualsBrandsSharp ManualsComputer equipmentMD-MS721H

MD-MS722H/MS721H

– 1 –

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)

MD-MS722H

MD-MS721H(BL)

MD-MS721H(S)

SERVICE MANUAL

SHARP CORPORATION

No. SX887MDMS722H

This document has been published to be used

for after sales service only.

The contents are subject to change without notice.

• 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-MS722H)

(Illustration: MD-MS721H)

Summary of content (53 pages)

PAGE 1
MD-MS722H/MS721H SERVICE MANUAL No. SX887MDMS722H MD-MS722H MD-MS721H(BL) MD-MS721H(S) (Illustration: MD-MS722H) • 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.
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MD-MS722H/MS721H SAFETY PRECAUTION FOR SERVICE MANUAL Precaution to be taken when replacing and servicing the Laser Pickup. (MS722H Except for UK/MS721H) 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.
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MD-MS722H/MS721H 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) Dimensions: (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.
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MD-MS722H/MS721H NAME OF PARTS MD-MS722H Remote control unit 2 1 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.
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MD-MS722H/MS721H MD-MS721H Remote control unit 2 1 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.
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–6– O PO EP NE N DC IN 5V OPEN To the DC IN 5V socket Mark Notes: After charging has been completed, the AC adaptor may be left connected. (For example, when charging at night) If the rechargeable battery is in the unit, it will be charged, even whilst operating the unit. (Float charge) MS722H For UK: AC 230-240V, 50/60 Hz Insert securely, all the MS722H Except for UK/ way in. MS721H: AC 220-230V, 50/60 Hz 4 2 1 OPEN Do not force open the rechargeable battery cover too wide.
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When the unit has condensation inside, the disc signals cannot be read, and the unit may not function properly. If this happens, remove the disc. The condensation should evaporate in approximately 1 hour. The unit will then function properly.
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–8– ( The disc is out of recording space. A large portion of the disc has been damaged. There is no space left for recording character information (track names, disc names, etc.). The track has been protected from being erased. A large portion of the disc has been damaged. There is an error in the recorded signal. A disc which contains data other than music was played. There is an error in the signal from the disc. The temperature is too high.
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MD-MS722H/MS721H DISASSEMBLY Cares before disassembling When assembling the machine after disassembling or repair, observe the following requirements so as to ensure safety and performance. 1. Remove the batteries from the machine, and take out the mini-disc. 2. When assembling after repair, be sure to restore the initial location of wires. Since the screws are small, incorrect fixing may result in malfunction. 3. When repairing, pay utmost attention to static electricity of ICs. (A2)x2 ø1.
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MD-MS722H/MS721H REMOVING AND REINSTALLING THE MAIN PARTS Remove the mechanism according to the disassembling methods 1 to 3. (See Page 9.) (A2)x3 ø1.4x2.8mm How to remove the spindle motor (See Fig. 10-1.) Spindle Motor 1. Remove the solder joint (A1) x 1 of flex PWB. 2. Remove the stop (A2) x 3 pcs. and remove the spindle motor. Mecha Flexble PWB Solder joint (A1)x1 How to remove the lift motor (See Fig. 10-2.) 1. Remove the solder joint (B1) x 2 of slide motor lead wire. 2.
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MD-MS722H/MS721H ADJUSTMENT Test disc MD adjustment needs two types of disc, namely recording disc (low reflection disc) and playback-only disc (high reflection disc). Type Test disc Parts No. 1 High reflection disc MMD-110 (TEAC Test MD) 88GMMD-110 2 Lowreflection disc MMD-212 (TEAC Test MD) 88GMMD-212 3 Low reflection disc Recording minidisc UDSKM0001AFZZ Note: Use the low reflection disc on which music has been recorded. Entering the TEST mode 1.
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MD-MS722H/MS721H Operation in each TEST mode 1. AUTO1 Mode • When the STOP button is pressed while the AUTO1 menu appears or during automatic adjustment, the mode changes to the TEST mode stop state. At this time the adjustment value is not output. • Be sure to adjust, using the specified disc MMD-212. At this time release the EEPROM (IC402) protection. (Refer to EEPROM write procedure.
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MD-MS722H/MS721H •Whenever the DISP button is pressed in the continuous playback mode, the indication changes as follows.
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MD-MS722H/MS721H 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) (6) (7) (8) (9) (10) (11) (12) (13) (14) (15) Replace EEPROM. Deprive EEPROM of protection (connect the pins 8 and 6 of IC402). Refer to the latest EEPROM data list.
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MD-MS722H/MS721H EEPROM DATA LIST (EEPROM version f) Sled setting TEMP setting Item display T M _ _ Item display Set values Calculate values Fucus setting Set values S L G _ 6D H S L 2 _ 20 H S L M _ 4F H Set values S L V _ 36 H F G _ _ 63 H S K k _ 43 H F F 1 _ 70 H S K t _ 54 H F F 2 _ E8 H S K m _ 4D H F Z H _ EDH W T m _ 24 H F L n _ 09 H M V 1 _ 4A H D J G _ 14 H M V 2 _ AA F L V _ 20 H S R V _ 00 W T f _ 20 H F S S _ AAH Item display H H
PAGE 16
TEST REC – 16 – SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN DATA SKIP DOWN SKIP DOWN SKIP DOWN : INNER switch position measurement menu : EEPROM setting menu : Test mode normal playback menu : Error history display menu : Digital input signal monitor menu : ATT adjustment value check menu : Preadjustment value check menu : ATT manual adjustment menu : Pre-manual adjustment menu : Continuous record menu : Continuous playback menu : ATT autoadjustment menu :
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ADJ. NG Adjustment error : Continuous playback (high reflection) : Continuous playback (low reflection) : ATT adjustment normal end (adjustment value output) : ATT adjustment error (adjustment value output) : During ATT autoadjustment : ATT Autoadjustment menu * When the [STOP] key is pressed in specific menu, the "TEST MODE STOP" state is set. *" " represent the adjustment number as follows.
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– 18 – FL SKIP UP EL SKIP UP BL SKIP UP AL SKIP UP TH SKIP UP FH SKIP UP EH SKIP UP BH SKIP UP AH SKIP UP SB SKIP UP SA SKIP UP RFG SKIP UP SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN Continued from the preceding page : S gain "Low" F signal offset (FINO) measurement : Measurement value : S gain "Low" E signal offset (EINO) measurement : Measurement value : S gain "Low" B signal offset (BINO)
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– 19 – SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN Continued to the next page SKIP UP SA SKIP UP GCH SKIP UP PCH SKIP UP RFG SKIP UP RCG SKIP UP GTG SKIP UP PTG SKIP UP TH SKIP UP FL SKIP UP EL SKIP UP BL SKIP UP AL SKIP UP FH SKIP UP EH SKIP UP BH SKIP UP AH PLAY RSLT1 : A-ATT (focus) initial setting : Groove section adjustment COUT level s
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PLAY : Continuous playback menu PLAY : Continuous playback (pit section) : Continuous playback (groove section) # # # # : Address : Start address setting : Continuous playback menu BASS DISP Ad0 3 C 0 BASS DISP Ad0 7 9 0 DISP DISP Ad0 8 A 0 – 20 – BASS Ad0 0 5 0 BASS BASS Ad0 0 5 0 10TR BASS 3 8 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.
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: INNER switch position measurement menu : TEST mode normal playback menu – 21 – SKIP DOWN SKIP DOWN : U bit 2 data display : TIME (min.) : TIME (sec.) : U bit 1 data display : TNO : INDEX : FS code, C bit data display : Address : Control code : Category code : Digital input single monitor menu * When the [STOP] key is pressed in specific menu, the "TEST MODE STOP" state is set.
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SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN – 22 – SKIP DOWN : Control setting menu : Digital EQ setting menu : Adjustment setting menu : BASS setting menu : Sled setting menu : Spin setting menu : Tracking setting menu : Focus setting menu : TEMP setting menu : EEPROM setting menu SKIP DOWN SKIP DOWN : BASS setting menu * When the [STOP] key is pressed in specific menu, the "TEST MODE STOP" state is set.
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– 23 – SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN : Spin setting menu * 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 specific state the setting changed in the range of "00h to FFh" when the [VOL UP/DOWN] key is pressed.
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SKIP DOWN – 24 – SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN * 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 state the setting changes in the range of "00h to FFh" when the [VOL UP/DOWN] key is pressed.
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– 25 – SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN : Digital EQ setting menu * In the specific state the setting changes in the range of "0h to Fh" when the [VOL UP/DOWN] key is pressed. P-MODE P-MODE * 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".
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– 26 – SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN SKIP DOWN P-MODE * In the specific state the setting changes in the range of "0h to Fh" when the [VOL UP/DOWN] key is pressed. P-MODE * 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".
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Figure 27 BLOCK DIAGRAM – 27 – T M902 SLED MOTOR M901 SPINDLE MOTOR F PICK OPIC LASER HEAD LIFT MOTOR 1,6 19,20 +2.5 +2.8 +2.5 IC901 3-PHASE BRUSHLESS DRIVER BA6965AF 17 1-4 +2.5 13 24,26 29,31 +2.8 4 +2.8 7,9 VCC 35 VCC 6,8 VM IC601 PWM DRIVER 17A39TD +2.5 13,14 24,42 IC101 RF SIGNAL PROCESSOR IR3R55 13 VS IC351 HEAD DRIVER 74ACT02T 1 VCC IC651 MOTOR DRIVER LB1930M 25-30,40 8,11 14 3,4 IC402 EEPROM S29L294A 2,15-17, 19-22 +4.
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MD-MS722H/MS721H P28 P29 P30 MAIN PWB-A C112 0.033 C122 270P(CH) TP121 TP122 97 98 99 100 EFMO LDCNT2 LDCNT1 SYSD7 SYWRX SYRDX SYRS 29 28 27 26 RAA0 RAA1 RAA2 RAA3 LDCNT2 LDCNT1 X700KO 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 VCCENDEC TP201 R161 1.2K 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 RAA9 RAD3 RAD2 RACASX DGND RAOEX RAA8 RAA7 RAA6 RAA5 RAA4 VDD2 RAA10 IC201 LR37811 ENDEC LSI CK224 TP203 CK222 C205 0.1 C201 1/16 C165 0.
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MD-MS722H/MS721H P28 P29 P30 DADATA ADDATA DFCK BCLK LRCK DIN ADPON DAPON OPTCNT XL201 33.8688MHz R222 1M C212 8P(CH) TP212 TP205 TP208 TP211 LDCNT2 LDCNT1 CK207 06 K JOG0 JOG1 R460 47K R455 R456 R457 HKEY2 R459 5.6K 8.2K 18K 47K HSTOP HPLAY EMPH1 HKEY1 RAA0 RAA1 RAA2 RAA3 LDCNT2 LDCNT1 X700KO A10 A0 A1 A2 A3 VCC A8 18 A7 17 A6 16 A5 15 A4 14 GND 13 IC202 IX2723AF 16BIT D-RAM C202 47/6.
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MD-MS722H/MS721H P28 P29 P30 KEY FLEXIBLE PWB UNIT FLEXIBLE PWB DADATA ADDATA DFCK BCLK LRCK DIN ADPON DAPON OPTCNT HREC JOG0 JOG1 R460 47K R455 R456 R457 HKEY2 R459 5.6K 8.2K 18K 47K HSTOP R458 56K A TP451 TP452 TP453 TP454 TP455 TP456 TP457 TP458 TP459 HPLAY EMPH1 HKEY1 R451 R452 5.6K 8.
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MD-MS722H/MS721H IC101 PIN VOLTAGE NO. 0.7V 1 0.7V 2 0.7V 3 0.7V 4 1.29V 5 1.26V 6 0.7V 7 1.26V 8 1.26V 9 1.26V 10 1.26V 11 1.26V 12 2.52V 13 2.52V 14 0.18V 15 2.52V 16 2.52V 17 0V 18 0V 19 1.46V 20 2.34V 21 0V 22 0V 23 2.51V 24 1.26V 25 1.26V 26 1.26V 27 1.26V 28 1.26V 29 1.6V 30 1.26V 31 1.26V 32 1.26V 33 NC 34 1.26V 35 1.26V 36 0V 37 1.26V 38 1.26V 39 1.26V 40 1.26V 41 2.52V 42 0V 43 0V 44 1.26V 45 1.26V 46 1.26V 47 0V 48 IC202 PIN NO. VOLTAGE 2.5V 1 1.23V 2 1.35V 3 2.37V 4 1.71V 5 NC 6 0.9V 7 1.
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MD-MS722H/MS721H A J703 REMOTE CONTROL/ HEADPHONES J801 DC IN R800 C804 J702 MIC IN R809 R726 R806 L871 C872 D861 F800 C806 L851 8 C727 L862 Q891 C861 R805 R728 D801 C726 R725 IC801 1 IC802 C725 Q721 C805 L703 4 5 R892 C731 6 3 4 C807 D800 1 C736 R804 R727 Q892 C735 R803 B R893 R891 R801 R810 R802 D802 L704 C715 R453 C422 D871 C511 L500 C500 C508 R500 13 R222 C202 C212 75 70 65 51 8 C201 50 55 60 L201 76 80 L603 L604 L602 1 45 L601
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MD-MS722H/MS721H P34 6 - H LCD TP721 D492 65 Q830 R815 Q842 R831 C827 30 5 100 10 15 TP407 TP201 TP106 TP108 TP111 IC402 TP121 TP109 CN101 R404 C905 TP408 C354 TP663 TP410 TP205 22 TP122 1 TP665 R414 R413 4 5 8 TP411 TP351 R907 PICKUP FLEXIBLE PWB P34 1 - C 8 R829 C830 TP454 R922 TP651 TP660 TP417 TP610 R402 1 10 TP654 C911 R401 TP653 20 TP601 C903 5 IC901 10 11 C902 C910 R908 R909 TP602 R903 15 13 R905 TP901 R906 TP803 TP119 2 14 11 TP452 TP664
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MD-MS722H/MS721H IC101 PIN VOLTAGE NO. 0.7V 1 0.7V 2 0.7V 3 0.7V 4 1.29V 5 1.26V 6 0.7V 7 1.26V 8 1.26V 9 1.26V 10 1.26V 11 1.26V 12 2.52V 13 2.52V 14 0.18V 15 2.52V 16 2.52V 17 0V 18 0V 19 1.46V 20 2.34V 21 0V 22 0V 23 2.51V 24 1.26V 25 1.26V 26 1.26V 27 1.26V 28 1.26V 29 1.6V 30 1.26V 31 1.26V 32 1.26V 33 NC 34 1.26V 35 1.26V 36 0V 37 1.26V 38 1.26V 39 1.26V 40 1.26V 41 2.52V 42 0V 43 0V 44 1.26V 45 1.26V 46 1.26V 47 0V 48 IC202 PIN NO. VOLTAGE 2.5V 1 1.23V 2 1.35V 3 2.37V 4 1.71V 5 NC 6 0.9V 7 1.
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MD-MS722H/MS721H A J703 REMOTE CONTROL/ HEADPHONES J801 DC IN R800 C804 J702 MIC IN R809 R726 R806 L871 C872 D861 F800 C806 L851 8 C727 L862 Q891 C861 R805 R728 D801 C726 R725 IC801 1 IC802 C725 Q721 C805 L703 4 5 R892 C731 6 3 4 C807 D800 1 C736 R804 R727 Q892 C735 R803 B R893 R891 R801 R810 R802 D802 L704 C715 R453 C422 D871 C511 L500 C500 C508 R500 13 R222 C202 C212 75 70 65 51 8 C201 50 55 60 L201 76 80 L603 L604 L602 1 45 L601
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MD-MS722H/MS721H P34 6 - H LCD TP721 D492 65 Q830 R815 Q842 R831 C827 30 5 100 10 15 TP407 TP201 TP106 TP108 TP111 IC402 TP121 TP109 CN101 R404 C905 TP408 C354 TP663 TP410 TP205 22 TP122 1 TP665 R414 R413 4 5 8 TP411 TP351 R907 PICKUP FLEXIBLE PWB P34 1 - C 8 R829 C830 TP454 R922 TP651 TP660 TP417 TP610 R402 1 10 TP654 C911 R401 TP653 20 TP601 C903 5 IC901 10 11 C902 C910 R908 R909 TP602 R903 15 13 R905 TP901 R906 TP803 TP119 2 14 11 TP452 TP664
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MD-MS722H/MS721H OPTICAL PICKUP UNIT (15) A M902 SLED MOTOR M901 SPINDLE MOTOR M903 LIFT MOTOR BK B RD SW901 DISC IN CN601 SW902 DISC PROTECT C TO MAIN PWB P33 11 - H MECHA FLEXIBLE PWB UNIT (8) CN101 TO MAIN PWB P33 8 - H MAGNETIC HEAD FLEXIBLE PWB (23) D MD-MS722H MAGNETIC HEAD (32) E KEY FLEXIBLE PWB ASS'Y (248) LCD (249) CN451 TO MAIN PWB P33 12 - E F MD-MS721H KEY FLEXIBLE PWB ASS'Y (248) G CN451 TO MAIN PWB P33 12 - E CN482 TO MAIN PWB P33 11 - B H 1 2 3 4 Figure 34 WIRING OF
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MD-MS722H/MS721H 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.
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MD-MS722H/MS721H WAVEFORMS OF MD CIRCUIT T Stopped CH1=1mV DC 10:1 1 CH2=500mV DC 10:1 CH3=5V DC 10:1 TP208 (FEOUT) 5 SDTi 6 SCLK 4 T 7 CK205 (SENSE) 9 TP201 (EFM) 10 TP210 (TEOUT) 11 TP209 (TOTAL) CH2=2V DC 10:1 CH3=500mV DC 10:1 1994 / 12 / 16 01:03:40 2ms/div (2ms/div) ENV CK204 (FOK) 2 3 8 T MCLK 4 =Offset= CH1 : 0.00V CH2 : 0.000V CH3 : 0.00V CH4 : 0.
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MD-MS722H/MS721H TROUBLESHOOTING It is advisable to use the TEST mode (refer to Error Data Display Mode, P13) indicating the causes of troubles before starting repair. Causes of operation errors (up to 10 errors) are recorded as error codes. This information is useful for repair. When does not function When the CD section does not operate When the objective lens of the optical pickup is dirty,this section may not operate.Clean the objective lens,and check the playback operation.
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MD-MS722H/MS721H • Abnormal display Is waveform output from CNS 482 pins 1 to 3? Are the pin7 (VCC) and pin 6 (GND) normal? Is waveform output from IC 401 pins 45 to 47? No No Yes Check the periphery of IC401. Check between IC401 and CNS482. Yes Check for pattern breakage of flexible PWB, check for defects of display microcomputer (replace the display unit). • Playback state cannot be set When it has been ascertained that the address up to cluster address is normal in the TEST mode.
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MD-MS722H/MS721H • The spindle motor fails to run.Does the head move Does the waveform appear on the IC201 pins 24 and 25 after TEST mode AUTO2 completion and in this state? No Check the IC201 periphery. Yes Does waveform appear on the IC601 pin 13? No Replace IC601. Yes Does waveform appear on IC901 pins 1, 19 and 20? No L608, IC201, IC901, CN601 and flex, etc. soldering check. Yes Replace the spindle motor.
PAGE 43
MD-MS722H/MS721H FUNCTION TABLE OF IC IC401 RH-iX2772AF03(IX2772AF):System Microcomputer (1/2) Pin No.
PAGE 44
MD-MS722H/MS721H IC401 RH-iX2772AF03(IX2772AF):System Microcomputer (2/2) Pin No.
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MD-MS722H/MS721H PACKING METHOD (MD-MS722H FOR UK ONLY) 10. Strap 11. Connection Cord, Optical Type 12. Operation Manual 13. Carrying Case 14. Paper Bag, Unit 15. Service Card 16. Spacer, Operation Manual 17. Packing Add., Unit 18. Packing Add., Unit SETTING POSITION OF SWITCHES AND KNOBS UNIT HOLD OFF Remote Control HOLD CANCEL 1. Battery Case 2. Connecting Cord, RCA Type 3. AC Adaptor 4. Headphones 5. Remote Control 6. Packing Add. 7. Packing Case 8. Pad, AC Adaptor 9.
PAGE 46
MD-MS722H/MS721H PARTS GUIDE MODEL MD-MS722H MD-MS721H(BL) MD-MS721H(S) “HOW TO ORDER REPLACEMENT PARTS” To have your order filled promptly and correctly, please furnish the following information. 1. MODEL NUMBER 2. REF. No. 3. PART NO. 4. DESCRIPTION For U.S.A. only Contact your nearest SHARP Parts Distributor to order.
PAGE 47
MD-MS722H/MS721H NO. PRICE RANK PARTS CODE DESCRIPTION INTEGRATED CIRCUITS IC101 IC200 IC201 IC202 IC351 IC401 VHIIR3R55//-1 VHI62FP2002-1 VHILR37811/-1 RH-IX2723AFZZ VHI74ACT02T-1 RH-IX2772AF03 J J J J J J AQ AE BB BC AE AW RF Signal,Processor,IR3R55 2V Regulator,62FP2002 ENDEC LSI,LR37811 16Bit D-RAM,IX2723AF Head Driver,74ACT02T System Microcomputer, IX2772AF (Serial No.811×××××) System Microcomputer, IX2772AF (Serial No.
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MD-MS722H/MS721H PRICE RANK NO.
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MD-MS722H/MS721H NO.
PAGE 50
MD-MS722H/MS721H NO.
PAGE 51
MD-MS722H/MS721H 506 A 503 8-1 8 8-4 2 505 B 8-2 (SW901) 9 1 8-3 (SW902) 502x3 514 16 18 M901 C 13 503x2 25 514 11 15 504 M902 515 516 M903 27 D 7 508 509 23 E 6 517 28 511x2 29 F 3 518x2 32 30 12 4 G 20 508 H 5 1 2 3 4 Figure 5 MD MECHANISM EXPLODED VIEW –5– 5 6
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MD-MS722H/MS721H MS722 235 240 241 A 242 238 237 243 236 MD MECHANISM 239 244 234 229 246 233 B 219 203 249 250 248 MS721H ONLY 213 217 216 263 230 212 212 214 251x2 218 212 C 252 606x2 211 216 603 606 MS721H ONLY 601 215 601 220 208 218 226 201-5 256 207 202 601 201-2 202-1 201-1 201-4 210 607 201-3 D 202 -2 223x2 225x2 205 201 209 206 232 231 601 222 225x2 MS721 PWB–A 266 228x2 E 604 604 265 234 221 246 254 253 238 255 F 249 204 204-4 241 204
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MD-MS722H/MS721H PACKING METHOD (MD-MS722H FOR UK ONLY) 10. Strap 11. Connection Cord, Optical Type 12. Operation Manual 13. Carrying Case 14. Paper Bag, Unit 15. Service Card 16. Spacer, Operation Manual 17. Packing Add., Unit 18. Packing Add., Unit SETTING POSITION OF SWITCHES AND KNOBS UNIT HOLD OFF Remote Control HOLD CANCEL 1. Battery Case 2. Connecting Cord, RCA Type 3. AC Adaptor 4. Headphones 5. Remote Control 6. Packing Add. 7. Packing Case 8. Pad, AC Adaptor 9.