Sharp MDS PC1 Service Manual

SERVICE MANUAL

Ver 1.1 2004. 09

MDS-PC1

9-922-739-13

2004I02-1

MiNi DiSC DECK

Sony Corporation

Audio Group

Published by Sony Engineering Corporaton

SELF-DIAGNOSIS FUNCTION

The self-diagnosis function consists of error codes for users which are displayed automatically when errors occur, and error codes which show the error history in the test mode during servicing. For details on how to view error codes for users, refer to the following box in the instruction manual. For details on how to perform checks during servicing, refer to the following “Procedure for Using the Self-Diagnosis Function (Error History Display Mode)”.

Procedure for Using the Self-Diagnosis Function (Error History Display Mode) Note: Perform the self-diagnosis function in the “error history display mode” in the test mode. The following describes the least required

steps. Be careful not to enter other modes by mistake. If other modes are set accidentally, press the EDIT/NO button to exit that mode.

1. While pressing the AMS dial, connect the power plug to the outlet, and release the AMS dial.

2. Rotate the AMS dial until “ERR DP MODE” is displayed.

3. Pressing the YES button sets the error history mode and displays “total rec”.

4. Select the contents to be displayed or executed using the AMS dial.

5. Pressing the AMS dial displays or executes the contents selected.

6. Pressing the AMS dial another time returns to step 4.

7. Pressing the EDIT/NO button displays “ERR DP MODE” and exits the error history mode.

8. T o e xit the test mode, set the TIMER knob to “OFF”, and press the 1/u button. The unit sets into the STANDBY state, and the test mode ends.

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ITEMS OF ERROR HISTORY MODE ITEMS AND CONTENTS

Selecting the Test Mode

Display

total rec

total play

retry err

total err

err history

er refresh?

Details of History

Displays the recording time in the form of “rππππππh”. The displayed time is the total number of hours the laser is high power, which is about one-fourth of the actual recording time. The time is displayed in decimal digits between 0h and 65535h.

Displays the playback time in the form of “pππππππh”. The displayed time is the total actual play time. The paused time is not counted. The time is displayed in decimal digits between 0h and 65535h.

Displays the total number of retries during recording and retry errors during playback in the form of “rππpππ”. r indicates the retries during recording while p indicates the retry errors during playback. The number of retries is displayed in hexadecimal digits between 00 and FF.

Displays the total number of errors in the form of “totalππ”. The number of errors is displayed in hexadecimal digits between 00 and FF.

Displays the 10 latest errors in the form of “0π E@@”. The π indicates the history number. The smaller the number, the newer is the error. (00 is the latest error.) The @@ indicates the error code. Refer to the following table for details. Rotate the AMS dial to switch the error history.

Mode which erases all the error histories. The error history serves as a reference for when to replace the optical pick-up. Perform this procedure when the optical pick-up has been replaced in order to erase past error histories and not at other times. Press the YES button when “er refresh??” is displayed. The history will be erased and “Complete!” will be displayed momentarily. Be sure to check the following when this mode has been executed. *Check that the data has been erased. *Perform recording and playback, and check that the mechanism operates normally.

Table of Error Codes

Error Code

E00 E01

E02

E03 E04

No error Disc error. Cannot read PTOC (Disc is ejected out) Disc error. UTOC error (Disc is not ejected out) Loading error Cannot read address (Servo has deviated)

Details of Error

Error Code

E05 E06 E07 E08 E09

E0A

Details of Error

FOK has deviated Unfocused (Servo has deviated) Recording retry Recording retry error Play retry error (Access error) Playback retry error (C2 error)

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CAUTION

Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type recommended by the equipment manufacturer. Discard used batteries according to manufacture’s instructions.

ADVARSEL!

Laser component in this product is capable of emitting radiation exceeding the limit for Class 1.

This appliance is classified as a CLASS 1 LASER product. The CLASS 1 LASER PRODUCT MARKING is located on the rear exterior.

Lithiumbatteri - Eksplosionsfare ved fejlagtig håndtering.

Udskiftning må kun ske med batteri af samme fabrikat og type.

Levér det brugte batteri tilbage til leverandøren.

ADVARSEL

Eksplosjonsfare ved feilakting skifte av batteri.

Benytt samme batteritype eller en tilsvarende type anbefalt av

apparatfabrikanten.

Brukte batterier katterier kasseres i henhold til fabrikantens

VARNIG

Explosionsfara vid felaktigt batteribyte. Använd samma batterityp eller en likvärdig typ som rekommenderas av apparattillverkaren. Kassera använt batteri enligt gällande föreakrifter.

VAROITUS

Parist voi räjähtää, jos se on virheellisesti asennettu. V aihda paristo ainoastaan laite valmistajan suosittelemaan tyyppiin. Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.

This caution label is located inside the unit.

CAUTION

Use of controls or adjustments or performance of procedures other than those specified herein may result in hazardous radiation exposure.

Notes on chip component replacement

• Never reuse a disconnected chip component.

• Notice that the minus side of a tantalum capacitor may be damaged by heat.

Flexible Circuit Board Repairing

• Keep the temperature of soldering iron around 270˚C during repairing.

• Do not touch the soldering iron on the same conductor of the circuit board (within 3 times).

• Be careful not to apply force on the conductor when soldering or unsoldering.

SAFETY-RELATED COMPONENT WARNING !!

COMPONENTS IDENTIFIED BY MARK ! OR DO TTED LINE WITH MARK ! ON THE SCHEMATIC DIAGRAMS AND IN THE PARTS LIST ARE CRITICAL TO SAFE OPERATION. REPLACE THESE COMPONENTS WITH SONY PARTS WHOSE PART NUMBERS APPEAR AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUBLISHED BY SONY.

MODEL IDENTIFICATION — BACK PANEL —

Parts No.

PARTS No. MODEL

4-996-315-1π Singapore model 4-996-315-2π AEP, UK model 4-996-315-3π US model

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SAFETY CHECK-OUT

TABLE OF CONTENTS

After correcting the original service problem, perform the following safety checks before releasing the set to the customer: Check the antenna terminals, metal trim, “metallized” knobs, screws, and all other exposed metal parts for AC leaka ge. Check leakage as described below.

LEAKAGE

The AC leakage from any exposed metal part to earth Ground and from all exposed metal parts to any exposed metal part having a return to chassis, must not exceed 0.5 mA (500 microampers). Leakage current can be measured by any one of three methods.

1. A commercial leakage tester, such as the Simpson 229 or RCA WT-540A. Follow the manufacturers’ instructions to use these instruments.

2. A battery-operated AC milliammeter. The Data Precision 245 digital multimeter is suitable for this job.

3. Measuring the voltage drop across a resistor by means of a V OM or battery-operated A C v oltmeter. The “limit” indication is 0.75 V, so analog meters must have an accurate low-voltage scale. The Simpson 250 and Sanwa SH-63Trd are examples of a passive VOM that is suitable. Nearly all battery operated digital multimeters that have a 2V AC range are suitable. (See Fig. A)

To Exposed Metal Parts on Set

0.15µF

1.5k

Ω

AC voltmeter (0.75V)

1. SERVICING NOTE .......................................................... 6

2. GENERAL .......................................................................... 9

3. DISASSEMBLY

3-1. Front Panel ......................................................................... 29

3-2. Back Panel and Main Board ...............................................30

3-3. Bracket (T)/(L)/(R) ............................................................. 31

3-4. SUB Chassis ....................................................................... 31

3-5. Shutter Assembly ................................................................ 32

3-6. Slider Complete Assembly.................................................. 33

4. TEST MODE ..................................................................... 34

5. ELECTRICAL ADJUSTMENTS ............................... 38

6. DIAGRAMS

6-1. Circuit Boards Location ...................................................... 43

6-2. Block Diagrams

• BD Section ....................................................................... 45

• Main Section ....................................................................47

6-3. Schematic Diagram – BD (1/2) Section –........................... 51

6-4. Schematic Diagram – BD (2/2) Section –........................... 53

6-5. Printed Wiring Board – BD Section –.................................55

6-6. Printed Wiring Board – SW Section – ................................57

6-7. Schematic Diagram – SW Section – ................................... 58

6-8. Printed Wiring Board – Main Section –.............................. 59

6-9. Schematic Diagram – Main (1/3) Section – ........................ 61

6-10. Schematic Diagram – Main (2/3) Section – ...................... 63

6-11. Schematic Diagram – Main (3/3) Section – ...................... 65

6-12. Printed Wiring Board – Panel Section –............................ 67

6-13. Schematic Diagram – Panel Section – .............................. 69

6-14. IC Block Diagrams ........................................................... 71

6-15. IC Pin Functions ............................................................... 76

Earth Ground

Fig. A. Using an AC voltmeter to check AC leakage.

7. EXPLODED VIEWS

7-1. Front Panel Section ............................................................. 84

7-2. Chassis Section ................................................................... 85

7-3. Mechanism Deck Section 1 (MDM-3B) .............................86

7-4. Mechanism Deck Section 2 (MDM-3B) .............................87

8. ELECTRICAL PARTS LIST ........................................ 88

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SECTION 1

SERVICING NOTE

BD BOARD WAVEFORM CHECK TOOL

Use the jig (J-2501-124-A or J-2501-149-A) to facilitate the checking of the waveform of the BD board. The names and check items of each terminal are as follows.

I+3V : For measuring the IOP (check if the optical pick-up laser has weakened) IOP : For measuring IOP (check if the optical pick-up laser has weakened) TEO : TRK error signal (traverse adjustment) VC : Reference level for checking signals RF : RF signal (jitter check)

Mechanism deck

Jig

TEO

IOP

I+3V

GND

CN110

6P connector

Jig

(J-2501-149A)

GND can not be used.

H-3V

IOP

TEO

(J-2501-124A)

[FORCED RESET]

Perform forced reset if the unit does not operate normally due to the hangup of the microprocessor. It is recommended that this be performed when the test mode and retry cause display mode cannot be exited, or when the unit does not operate normally when reassembled after being disassembled.

Method:Disconnect the power plug from the outlet, short-circuit the JW143 and 164 (RESET) of the MAIN board using a pair of tweezers, and discharge the backup battery.

[MAIN BOARD] (Component Side)

JW143 JW164

CN307

IC401

IC101

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RETRY CAUSE DISPLAY MODE

* In this test mode, the causes for retry of the unit during recording and stop can be displayed on the fluorescent display tube. During

playback, the “track mode” for obtaining track information will be set. This is useful for locating the faulty part of the unit.

* The following will be displayed:

During recording and stop :Retry cause, number of retries, and number of retry errors. During playback :Information such as type of disc played, part played, copyright. These are displayed in hexadecimal.

Procedure:

1. Load a recordable disc whose contents can be erased into the unit.

2. Press the MENU/NO button. When “Edit Menu” is displayed on the fluorescent display tube, rotate the AMS dial to display “All Erase?”.

3. Press the YES button. (Or press the AMS dial)

4. When “All Erase??” is displayed on the fluorescent display tube, the music calendar number blinks.

5. Press the YES button to displa y “Complete!!”, and press the p button immediately . Wait for about 15 seconds while pressing the button. (The AMS dial can be pressed instead of the YES button for the same results.)

6. When the “TOC” displayed on the fluorescent display tube goes off, release the p button.

7. Press the rREC button to set the recording standby state. Then press the ·P button to start recording.

8. Press the DISPLAY/CHAR button and check the test mode display (Fig. 1).

9. T o c heck the “track mode”, press the ·P button to start play. Then press the DISPLAY/CHAR button to display the test mode display (Fig. 2), and check the display.

10. T o exit the test mode, press the 1/u button to turn OFF the power. When “TOC” disappears, disconnect the po wer plug from the outlet. If the test mode cannot be exited, refer to “Forced Reset” on page 5.

Fig. 1 Reading the Test Mode Display (During recording and stop)

RTs@@c##e**

Fluorescent display tube display

@@: Cause of retry ## : Number of retries ** : Number of retry errors

Fig. 2 Reading the Test Mode Display (During playback)

@@####** $$

Fluorescent display tube display

@@: Parts No. (name of area named on TOC) ## : Cluster ** : Sector $$ : Track mode (Track information such as copyright information of each part)

Reading the Retry Cause Display

Hexadecimal

Bit

Binary

Address (Physical address on disc)

}

Higher Bits Lower Bits

84218421

b7 b6 b5 b4 b3 b2 b1 b0

00000001 00000010

00000100

00001000 00010000 00100000 01000000 10000000

Hexa-

decimal

01 02

08 10 20 40 80

Cause of Retry Occurring conditions

shock Discontinuous address

ader5

DIN unlock FCS incorrect IVR rec error CLV unlock Access fault

When track jump (shock) is detected When ADIP address is not continuous When ADER was counted more than five times continuously When DIN unlock is detected When not in focus When ABCD signal level exceeds the specified range When CLV is unlocked When access operation is not performed normally

– 7 –

Reading the Display:

Convert the hexadecimal display into the binary display. If more than two causes, they will be added.

Example

When 44 is displayed:

Upper bit : 4=0100 n b6 Lower bit : 4=0010 n b2 In this case, the retry cause is combined of “CVL unlock” and “ader5”.

When A4 is displayed:

Upper bit : A=1010 n b7+b5 Lower bit : 4=0010 n b2 The retry cause in this case is combined of “access fault”, “IVR rec error”, and “ader5”.

Reading the Track Mode Display

Higher Bits Lower Bits

Hexadecimal

Bit

Binary

Reading the Display:

Convert the hexadecimal display into the binary display. Several cause are added and displayed.

Example

When 84 is displayed:

Upper bit : 8=1000 n b7 Lower bit : 4=0100 n b2 In this case, as b2 and b7 are 1 and others are 0, the cause is combined of “Emphasis OFF”, “Monaural”, “Original”, Copyrighted” and “Write permitted”.

When 07 is displayed:

Upper bit : 0=0000 n all 0 Lower bit : 7=0111 n b0+b1+b2 In this case, as b0, b1, and b2 are 1 and others are 0, the cause is combined of “Emphasis ON”, “Stereo”, “Original”, Copyrighted” and “Write prohibited”.

84218421

b7 b6 b5 b4 b3 b2 b1 b0

00000001 00000010 00000100 00001000 00010000 00100000 01000000 10000000

Hexa-

decimal

01 02 04 08 10 20 40 80

When 0 When 1

Emphasis OFF Monaural This is 2-bit display. Normally 01. 01:Normal audio. Others:Invalid Audio (Normal) Original Copyright Write prohibited

Details

Emphasis ON Stereo

Invalid Digital copy No copyright Write allowed

Hexadecimal/Decimal Conversion Table

Hexadecimal Binary Hexadecimal Binary

0 1 2 3 4 5 6 7

0000 0001 0010 0011 0100 0101 0110 0111

9 A B C D E

1000 1001 1010 1011 1100 1101 1110 1111

– 8 –

Front Panel

SECTION 2

GENERAL

Location of Parts and Controls

1 STANDBY lamp 2 1/u (Power) switch 3 Remote sensor 4 DISK compartment 5 § button 6 ·P button 7 p button 8 r button 9 PHONE LEVEL knob 10 PHONES jack 11 TIMER switch

12 CONTROL A1 jack 13 DISPLAY/CHAR button 14 PLAY MODE button 15 DISPLAY window 16 0/) button 17 EDIT/NO button 18 REC MODE switch 19 INPUT switch 20 YES button 21 REC LEVEL knob 22 AMS dial

• AMS is the abbreviation for Automatic Music Sensor.

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