MDS-JE480 - Sony Audio Service Manual (repair manual)

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.

System

MiniDisc digital audio system

Disc

MiniDisc

Laser

Semiconductor laser
(

λ

 = 780 nm) Emission

duration: continuous

Laser output

MAX 44.6 

µ

W

1)

1)    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

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)

ANALOG OUT

Jack type: phono
Rated output: 2 Vrms (at 50 kilohms)
Load impedance: over 10 kilohms

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

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.

2006L02-1
© 2006.12

2

    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.

    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)

0.15µF

1.5kΩ

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.

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.

Never look into the laser diode emission from right above when
checking it for adjustment. It is feared that you will lose your sight.

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.

3

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)”.

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.

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

1/

LASER NG

There is a problem with the optical 
pickup.
, The optical pick-up  may have failed. 

Consult your nearest Sony dealer.

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.

Eksplosjonsfare ved feilaktig skifte av batteri.

Benytt samme batteritype eller en tilsvarende type

anbefalt av apparatfabrikanten.

Brukte batterier kasseres i henhold til fabrikantens

instruksjoner.

Lithiumbatteri-Eksplosionsfare ved fejlagtig håndtering.

Udskiftning må kun ske med batteri

af samme fabrikat og type.

Levér det brugte batteri tilbage til leverandøren.

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.

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

Paristo voi räjähtää, jos se on virheellisesti asennettu.
Vaihda paristo ainoastaan laitevalmistajan suosittelemaan tyyppiin.
Hävitä käytetty paristo valmistajan ohjeiden mukaisesti.

4

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  

lAMSL

  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.