SONY MDSJE480 - Service Manual Immediate Download

MDS-JE480

SPECIFICATIONS

SERVICE MANUAL

MINIDISC DECK

Model Name Using Similar Mechanism

MDS-JE470

MD Mechanism Type

MDM-7S1A

Optical Pick-up Type

KMS-260B/260E

US Model

AEP Model

UK Model

US and foreign patents licensed form Dolby Laboratories

Licensing Corporation.

9-873-964-04

2005K02-1

Sony Corporation

Home Audio Division

Published by Sony Engineering Corporation

Ver. 1.3 2005.11

System

MiniDisc digital audio system

Disc

MiniDisc

Laser

Semiconductor laser

(

= 780 nm) Emission

duration: continuous

Laser output

MAX 44.6

µW1)

This output is the value measured at a distance of

200mm from the objective lens surface on the

Optical Pick-up Block with 7 mm aperture.

Laser diode

Material: GaAlAs

Revolutions (CLV)

400 rpm to 900 rpm

Error correction

ACIRC (Advanced Cross

Interleave Reed Solomon Code)

Sampling frequency

44.1 kHz

Coding

ATRAC (Adaptive

Transform Acoustic Coding)/

ATRAC 3

Modulation system

EFM (Eight-to-Fourteen

Modulation)

Number of channels

2 stereo channels

Frequency response

5 to 20,000 Hz

±0.5 dB

during play

Signal-to-noise ratio

Over 96 dB during play

Wow and flutter

Below measurable limit

Inputs

ANALOG IN

Jack type: phono

Impedance: 47 kilohms

Rated input: 500 mVrms

Minimum input: 125 mVrms

DIGITAL OPTICAL IN

Connector type: square optical

Impedance: 660 nm

(optical wave length)

Outputs

ANALOG OUT

Jack type: phono

Rated output: 2 Vrms (at 50 kilohms)

Load impedance: over 10 kilohms

General

Power requirements

US model:

120 V AC, 60Hz

European model:

230 V AC, 50/60Hz

Power consumption

14 W (0.5 W in standby mode)

Dimensions (approx.)

430 x 95 x 285 mm

(w/h/d) incl. projecting

parts and controls

Mass (approx.)

3.0 kg

Supplied accessories

Audio connecting cords (2)

Optical cable (1)

Remote commander (remote) (1)

R6 (size-AA) batteries (2)

Design and specifications are subject to change without notice.

MDS-JE480

SAFETY CHECK-OUT

After correcting the original service problem, perform the fol-

lowing 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 leakage. 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 VOM

or battery-operated AC voltmeter. 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 pas-

sive VOM that is suitable. Nearly all battery operated digital

multimeters that have a 2V AC range are suitable. (See Fig. A)

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

0.15µF

To Exposed Metal

Parts on Set

1.5k

voltmeter

(0.75V)

Earth Ground

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.

CAUTION

Use of controls or adjustments or performance of procedures

other than those specified herein may result in hazardous radia-

tion 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.

NOTES ON HANDLING THE OPTICAL PICK-UP

BLOCK OR BASE UNIT

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

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

Never look into the laser diode emission from right above when

checking it for adjustment. It is feared that you will lose your sight.

SAFETY-RELATED COMPONENT WARNING!!

COMPONENTS IDENTIFIED BY MARK 0 OR DOTTED LINE WITH

MARK 0 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.

This caution

label is located

inside the unit.

Ver 1.1 2003.04

MDS-JE480

SELF-DIAGNOSIS FUNCTION

The self-diagnosis function consists of error codes for customers 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 the customer, refer to the following box

in the instruction manual. For details on how to check error codes during servicing, refer to the following "Procedure for using the Self-

Diagnosis Function (Error History Display Mode)".

Self-diagnosis function

The deck's self-diagnosis function automatically checks

the condition of the MD deck when an error occurs, then

issues a three- or five-digit code and an error message on

the display. If the code and message alternate, find them in

the following table and perform the indicated

countermeasure. Should the problem persist, consult your

nearest Sony dealer.

Three- or five-

digit code/

Message

Cause/Remedy

C11/Protected

, Take out the MD and close the record-

protect slot.

C12/Cannot Copy

You tried to record a CD with a format

that the external device connected to the

deck does not support, such as CD-ROM

or video CD.

, Remove the disc and insert a music

CD.

C13/REC Error

, Set the deck in a stable surface, and

repeat the recording procedure.

The inserted MD is dirty (with smudges,

fingerprints, etc.), scratched, or

substandard in quality.

, Replace the disc and repeat the

recording procedure.

C13/Read Error

, Take out the MD and insert it again.

C14/Toc Error

, Insert another disc.

, If possible, erase all the tracks on the

MD .

C41/Cannot Copy

The sound source is a copy of

commercially available music software, or

you tried to record a CD-R (Recordable

CD).

, The Serial Copy Management System

prevents making a digital copy.

You cannot record a CD-R.

C71/Din Unlock

The sporadic appearance of this message

is caused by the digital signal being

recorded. This will not affect the

recording.

While recording from a digital component

connected through the DIGITAL IN

connector, the digital connecting cable

was unplugged or the digital component

turned off.

, Connect the cable or turn the digital

component back on.

E0001/

MEMORY NG

There is an error in the internal data that

the deck needs in order to operate.

, Consult your nearest Sony dealer.

E010

E0201

LOADING NG

LASER NG

There is a problem with the optical

pickup.

, The optical pick-up may have failed.

Consult your nearest Sony dealer.

Three- or five-

digit code/

Message

Cause/Remedy

There is a problem with the loading.

,The loading may have failed. Consult

your nearest Sony dealer.

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

procedure. Be careful not to enter other modes by mistake. If you set other modes accidentally, press the MENU/NO button to exit

the mode.

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.

ADVARSEL!

Lithiumbatteri-Eksplosionsfare ved fejlagtig håndtering.

Udskiftning må kun ske med batteri

af samme fabrikat og type.

Levér det brugte batteri tilbage til leverandøren.

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.

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.

MDS-JE480

ITEMS OF ERROR HISTORY MODE ITEMS AND CONTENTS

Selecting the Test Mode

Display

op rec tm

op play tm

spdl rp tm

retry err

total err

err history

retry adrs

er refresh

tm change

op change

History

Displays the total recording time.

When the total recording time is more than 1 minute, displays the hour and minute

When less than 1 minute, displays "Under 1 min"

The display time is the time the laser is set to high power, which is about 1/4 of the actual recording time.

Displays the total playback time.

When the total playback time is more than 1 minute, displays the hour and minute

When less than 1 minute, displays "Under 1 min"

Displays the total rotating time of the spindle motor.

When the total rotating time is more than 1 minute, displays the hour and minute

When less than 1 minute, displays "Under 1 min"

Displays the total number of retry errors during recording and playback

Displays "r xx p yy". xx is the number of errors during recording. yy is the number of errors during playback.

This is displayed in hexadecimal from 00 to FF.

Displays the total number of errors

Displays "total xx". This is displayed in hexadecimal from 00 to FF.

Displays the past ten errors.

Displays "0x ErrCd@@".

X is the history number. The younger the number, the more recent is the history (00 is the latest). @@ is the error

code.

Select the error history number using the lAMSL knob.

Displays the past five retry addresses.

Displays "xx ADRS yyyy", xx is the history number, yyyy is the cluster with the retry error.

Select the error history number using the lAMSL knob.

Mode for erasing the error and retry address histories

Procedure

1. Press the lAMSL knob when displayed as "er refresh".

2. Press the YES button when the display changes to "er refresh?".

When "complete!" is displayed, it means erasure has completed.

Be sure to check the following after executing this mode.

*Data has been erased.

*Perform recording and playback, and check that the mechanism is normal.

Mode for erasing the total time of recording and playback

Procedure

1. Press the l

AMSL knob when displayed as "tm refresh".

2. Press the YES button when the display changes to "tm refresh?".

When "complete!" is displayed, it means erasure has completed.

Mode for erasing the total time of op rec tm, op play tm.

These histories are based on the time of replacement of the optical pickup. If the optical pick-up has been replaced,

perform this procedure and erase the history.

Procedure

1. Press the lAMSL knob when displayed as "op change".

2. Press the YES button when the display changes to "op chang?".

When "Complete!" is displayed, it means erasure has completed.

1. While pressing the lAMSL knob and x button, connect the power plug to the outlet, and release the lAMSL knob and

x button.

When the test mode is set, "[Check]" will be displayed.

2. Rotate the lAMSL knob and when "[Service]" is displayed, press the YES button.

3. Rotate the lAMSL knob and display "Err Display".

4. Pressing the YES button sets the error history mode and displays "op rec tm".

5. Select the contents to be displayed or executed using the lAMSL knob.

6. Pressing the lAMSL knob will display or execute the contents selected.

7. Pressing the lAMSL knob another time returns to step 4.

8. Pressing the MENU/NO button displays "Err Display" and exits the error history mode.

9. To exit the test mode, press the REPEAT button. The unit sets into the STANDBY state, the disc is ejected, and the test mode ends.

MDS-JE480

Mode for erasing the total spdl rp tm time

These histories are based on the time of replacement of the spindle motor. If the spindle motor has been replaced,

perform this procedure and erase the history.

Procedure

1. Press the lAMSL knob when displayed as "spdl change"

2. Press the YES button when the display changes to "spdl chang?"

When "Complete!" is displayed, it means erasure has completed.

Description

Table of Error Codes

Error Code

Could not load

Loading switches combined incorrectly

Timed out without reading the top of PTOC

Could read top of PTOC, but detected error

Timed out without accessing UTOC

Timed out without reading UTOC

Error in UTOC

Could not start playback

Error in sector

Retry cause generated during normal recording

Retried in DRAM overflow

Retry occurred during TOC writing

Retry aborted during S.F editing

Other than access processing, and could not read address.

Focus NG occurred and overran.

MODEL IDENTIFICATION

-- BACK PANEL --

Part No.

MODEL

US model

AEP and Russian models

UK model

PARTS No.

4-238-633-0s

4-238-633-5s

4-238-633-6s

TABLE OF CONTENTS

1. SERVICING NOTES ........................................................ 6

2. GENERAL ........................................................................ 12

3. DISASSEMBLY

3-1. Disassembly flow .............................................................. 13

3-2. Upper Case (408226) ........................................................ 14

3-3. Front Panel Section ........................................................... 14

3-4. Main Board ....................................................................... 15

3-5. PT Board ........................................................................... 15

3-6. Mechanism Deck Section ( MDM-7S1A) ........................ 16

3-7. Over Light Head (HR901), BD Board .............................. 16

3-8. Holder Assy ....................................................................... 17

3-9. Loading Motor Assy (M103) ............................................ 17

3-10. Sled Motor Assy (M102), Slider ....................................... 18

3-11. Optical Pick-up .................................................................. 18

3-12. Spindle Motor Assy (M101) ............................................. 19

4. TEST MODE ......................................................................20

5. ELECTRICAL ADJUSTMENTS ............................... 25

6. DIAGRAMS

6-1. Circuit Boards Location ...................................................... 36

6-2. Block Diagrams

· BD Section ....................................................................... 38

· Main Section .................................................................... 39

6-3. Printed Wiring Board BD Board ................................... 40

6-4. Schematic Diagram BD Section (1/2) ........................... 41

6-5. Schematic Diagram BD Section (2/2) ........................... 42

6-6. Schematic Diagram Main Section (1/2) ........................ 43

6-7. Schematic Diagram Main Section (2/2) ........................ 44

6-8. Printed Wiring Board Main Section ............................. 45

6-9. Printed Wiring Board Display Section .......................... 46

6-10. Schematic Diagram Display Section .......................... 47

6-11. Printed Wiring Board Power Section ......................... 48

6-12. Schematic Diagram Power Section ............................ 48

6-13. IC Pin Function Discription ............................................ 49

6-14. IC Block Diagrams ........................................................... 55

7. EXPLODED VIEWS

7-1. Chassis Section ................................................................... 58

7-2. Front Panel Section ............................................................. 59

7-3. Mechanism Section-1 (MDM-7S1A) ................................. 60

7-4. Mechanism Section-2 (MDM-7S1A) ................................. 61

8. ELECTRICAL PARTS LIST ........................................ 62

Display

History

spdl change

Ver. 1.3