SONY MDSEX77 - Service Manual Immediate Download

MICROFILM

MDS-EX77

MINI DISC DECK

SERVICE MANUAL

AEP Model

UK Model

E Model

Model Name Using Similar Mechanism

MDS-S37

MD Mechanism Type

MDM-3A

Optical Pick-up Name

KMS-260A/J1N

U.S and foreign patents licensed from Dolby Labora-

tories Licensing Corporation.

SPECIFICATIONS

MDS-EX77 is the mini disc deck

section in DHC-MD77/EX77MD.

NOTES ON HANDLING THE OPTICAL PICK-UP

BLOCK OR BASE UNIT

The laser diode in the optical pick-up block may suffer electro-

static break-down because of the potential difference generated

by the charged electrostatic load, etc. on clothing and the human

body.

During repair, pay attention to electrostatic break-down and also

use the procedure in the printed matter which is included in the

repair parts.

The flexible board is easily damaged and should be handled with

care.

NOTES ON LASER DIODE EMISSION CHECK

The laser beam on this model is concentrated so as to be focused

on the disc reflective surface by the objective lens in the optical

pick-up block. Therefore, when checking the laser diode emis-

sion, observe from more than 30 cm away from the objective lens.

Notes on chip component replacement

· Never reuse a disconnected chip component.

· Notice that the minus side of a tantalum capacitor may be dam-

aged by heat.

Flexible Circuit Board Repairing

· Keep the temperature of the soldering iron around 270 °C dur-

ing 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.

This appliance is classified as a CLASS 1 LASER product.

The CLASS 1 LASER PRODUCT MARKING is located on

the rear exterior.

Laser component in this product is capable of emitting radiation

exceeding the limit for Class 1.

The following 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.

TABLE OF CONTENTS

SERVICING NOTES

1-1.

Power Supply During Servicing .....................................

1-2.

Flourescent Indicator Tube/Buttons/

Jog and LEDs Check Mode ............................................

1-3.

Selection of Input Signal ................................................

1-4.

Retry Cause Display Mode at Record ............................

GENERAL ..................................................................

DISASSEMBLY ........................................................ 19

TEST MODE

4-1.

Precautions for Use of Test Mode .................................. 24

4-2.

Setting the Test Mode ..................................................... 24

4-3.

Releasing the Test Mode ................................................ 24

4-4.

Basic Operations of the Test Mode ................................ 24

4-5.

Selecting the Test Mode ................................................. 24

4-6.

Operating the Continuous Playback Mode ..................... 25

4-7.

Operating the Continuous Recording Mode ................... 25

4-8.

EEP Mode ....................................................................... 26

4-9.

Functions of Other Buttons ............................................ 26

4-10. Test Mode Displays ........................................................ 26

4-11. Meanings of Other Displays ........................................... 26

ELECTRICAL ADJUSTMENTS

5-1.

Precautions for Checking Laser Diode Emission ........... 27

5-2.

Precautions for Use of Optical Pick-up (KMS-260A) ... 27

5-3.

Precautions for Adjustments ........................................... 27

5-4.

Creating MO Continuously Recorded Disc .................... 27

5-5.

Temperature Compensation Offset Adjustment ............. 28

5-6.

Laser Power Adjustment ................................................. 28

5-7.

Traverse (E-F Balance) Adjustment ............................... 29

5-8.

Focus Bias Adjustment ................................................... 30

5-9.

Error Rate Check ............................................................ 30

5-10. Focus Bias Check ........................................................... 30

5-11. Adjusting Points and Connecting Points ........................ 31

DIAGRAMS

6-1.

Block Diagram (1/2) ....................................................... 33

6-2.

Block Diagram (2/2) ....................................................... 35

6-3.

Printed Wiring Boards

MD MECHANISM DECK Section ......................... 38

6-4.

Schematic Diagram

MD MECHANISM DECK Section ......................... 41

6-5.

Schematic Diagram

MAIN/DISPLAY Section ......................................... 46

6-6.

Printed Wiring Boards

MAIN/DISPLAY Section ......................................... 51

6-7.

IC Pin Function Description ........................................... 59

EXPLODED VIEWS ................................................ 68

ELECTRICAL PARTS LIST ................................. 71

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK

! OR DOTTED 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.

CAUTION

Danger of explosion if battery is incorrectly replaced.

Replace only with the same or equivalent type recommended by

the manufacturer.

Discard used batteries according to the manufacturer's instructions.

ADVARSEL!

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 feilaktig skifte av batteri.

Benytt samme batteritype eller en tilsvarende type

anbefalt av apparatfabrikanten.

Brukte batterier kasseres i henhold til fabrikantens

instruksjoner.

VARNING

Explosionsfara vid felaktigt batteribyte.

Använd samma batterityp eller en likvärdig typ som

rekommenderas av apparattillverkaren.

Kassera använt batteri enligt gällande föreskrifter.

VAROITUS

Paristo voi räjähtää, jos se on virheellisesti asennettu.

Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin.

Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.

1-1. POWER SUPPLY DURING SERVICING

This set has no power supply in it, and it does not operate indi-

vidually. Therefore, connect to the pre/main amplifier system (TA-

EX77) for the DHC-MD77 or DHC-EX77MD in servicing. If

TA-EX77 is not available, use the power feed jig (PFJ-1) and jig

(J-2501-078-A). Using the jig, press the power switch (S408) on

the MAIN board in this set to turn on the power.

Connection:

SECTION 1

SERVICING NOTES

1-2. FLUORESCENT INDICATOR TUBE/BUTTONS/

JOG&LEDs CHECK MODE

1. While pressing the CD SYNC + CONTINUE buttons simul-

taneously, insert the power cord of TA-EX77 (pre/main am-

plifier) into the power outlet, then release the buttons. (Thus,

the check mode is activated.)

2. When buttons are released, "Key Check" is displayed for a

moment, then fluorescent indicator tubes are all turned on.

(LED for ANALOG IN indication is also turned on.)

3. As the buttons other than CD SYNC are pressed, fluores-

cent indicator tubes, one block each, are turned off, and all

tubes are off when operation of all buttons (except CD SYNC

button) is finished. (ANALOG IN LED is turned off when

button is pressed.)

4. Press the CD SYNC button with fluorescent indicator tube

in all off status, "Key TEST OK!" is displayed for a moment,

then "JOG&LEDCheck" is displayed.

(At this time,

if REPEAT button is pressed, "STANDBY" is displayed and

blinking, implying that normal operation is ready.)

5. With "JOG&LEDCheck" displayed, turning the SELECTOR

konb, and all LEDs simultaneously turn on and off repeatedly.

(If REPEAT button is pressed, normal operation is ready.)

6. With "JOG&LEDCheck" displayed, press the CD SYNC button,

and "SegmentCheck" is displayed for a moment, then segment

display is made. (If REPEAT button is pressed, normal op-

eration is ready.)

7. Press the CD SYNC button, and "end" is displayed. Then,

press the REPEAT button to finish the check mode.

1-3. SELECTION OF INPUT SIGNAL

With the power turned on, turning the SELECTOR konb while

pressing the

p button to select either of the following:

Analog in

Digital 1 in

Digital 2 in

Parts Location:

MAIN board (Component Side)

P707,909

CDP/TC

Power feed jig

(PFJ-1)

SYSTEM CONTROL connector

set

jig

(J-2501-078-A)

connector cable (17P)

(attached to the PFJ-1)

connector cable (7P)

(attached to the set)

CN904

(17P)

CN902

(7P)

CN501 (7P)

(S408)

Power switch

1-4. RETRY CAUSE DISPLAY MODE AT RECORD

Outline:

· In this mode, a cause of retry at recording can be displayed.

Thus, it will help find out a faulty location of the set.

· The contents displayed are data quantity stored in D-RAM, re-

try count, and retry cause. There are displayed with hexadeci-

mal numbers.

· From the data quantity in D-RAM, whether data writing, read-

ing, storing, and ejection are executed smoothly can be con-

firmed. If data writing failed, data quantity will be extremely

small.

Operating Method:

1. With the power turned on, load a disc (use a disc for recording

of which contents may be erased).

2. Press the EDIT/NO button, and "ALL Erase?" is displayed.

3. Press the ENTER/YES button, and a message changes to

"ALL Erase??" and numbers in music calendar blink.

4. Press the ENTER/YES button, and "Complete" is displayed.

5. When "Complete" appears, immediately keep pressing the

button for about 10 seconds.

6. When "TOC" on display disappears, release the

p button.

7. Press the

r REC button to start recording.

8. Press the DISPLAY/CHARACTER button, and the display

will changes as follows:

Data quantity in

D-RAM is displayed

at all times.

Retry cause is

displayed.

Retry count is displayed.

A numerical returns to 0 if retry

error occurred.

Note: These three kinds of displays are all made with hexadeci-

mal numbers.

9. Though Rt value increments each time retry is made, if an

error occurred, "Retry Error" is displayed and retry count re-

turns to 0.

10. To exit from this mode, turn off the TA-EX77 (pre/main am-

plifier) and after "TOC" display disappeared, disconnect the

power cord of TA-EX77 from the power outlet.

Using the jig, press the power switch (S408) on the MAIN

board in this set to turn off the power.