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US Model

Canadian Model

AEP Model

UK Model

Model Name Using Similar Mechanism

MDS-JA555ES

MD Mechanism Type

MDM-6J

Base Unit Type

MBU-5J

Optical Pick-up Type

KMS-260B/J1N

U.S. and foreign patents licensed from Dolby Laboratories
Licensing Corporation.

Photo : GOLD

MiniDisc digital audio system

MiniDisc

Semiconductor laser (

 λ

 = 780 nm)

Emission duration: continuous

MAX 44.6 µW

1

)

Material: GaAlAs

400 rpm to 900 rpm

ACIRC (Advanced Cross Interleave
Reed Solomon Code)

44.1 kHz

ATRAC (Adaptive TRansform
Acoustic Coding)/ATRAC 3

EFM (Eight-to-Fourteen
Modulation)

2 stereo channels

5 to 20,000 Hz ±0.3 dB

Over 100 dB during play

Below measurable limit

Jack type: phono
Impedance: 47 k 

Ω

Rated input: 500 mVrms
Minimum input: 125 mVrms

Connector type: square optical
Impedance: 660 nm (optical wave
length)

Connector type: square optical
Impedance: 660 nm (optical wave
length)

Jack type: phono
Impedance: 75 

Ω

Rated input: 0.5 Vp-p, ±20 %

Jack type: stereo phone
Rated output: 28 mW
Load impedance: 32 

Ω

Jack type: phono
Rated output: 2.5 Vrms (at 50
k 

Ω

)

Load impedance: over 10 k 

Ω

2

0

0

0

    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 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 microamperes).
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 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

0.15 

µ

F

1.5 k

Ω

AC
Voltmeter
(0.75 V)

Earth Ground

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

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.

Lithiumbatteri - Eksplosionsfare ved fejlagtig håndtering.

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

Levér det brugte batteri tilbage til leverandøren.

Eksplosjonsfare ved feilakting skifte av batteri.

Benytt samme batteritype eller en tilsvarende type anbefalt av

apparatfabrikanten.

Brukte batterier katterier kasseres i henhold til fabrikantens

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

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

Connector type: square optical
Rated output: –18 dBm
Load impedance: 660 nm (optical
wave length)

Jack type: phono
Rated output: 0.5 Vp-p (at 75 

Ω

)

Load impedance: 75 

Ω

US, Canadian

120 V AC, 60 Hz

AEP, UK

230 V AC, 50/60 Hz

20 W

430 

×

 123.5 

×

 375.5 mm (17 

×

 4 

7

/

8

×

 14 

7

/

8

 in.) (w/h/d) incl. projecting

parts and controls

10.5 kg (23 lbs 15 oz)

• 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.

3

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

The following caution label is located inside the unit.

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

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

• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be

damaged by heat.

• 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.

Parts No.

4-228-930-1

 : AEP, UK model

4-228-930-2

 : US model

4-228-930-3

 : Canadian model

·························································· 6

········································································ 12

3-1.

Case ·················································································· 16

3-2.

Loading Panel ··································································· 16

3-3.

Front Panel Assembly ······················································· 17

3-4.

MD Mechanism Deck ······················································ 17

3-5.

Tray Assembly ·································································· 18

3-6.

BU Holder Assembly ························································ 19

3-7.

Motor (Loading) Assembly (M10) ··································· 19

3-8.

Base Unit (MBU-5J) ························································ 20

3-9.

BD Board ·········································································· 20

3-10. Over Light Head (HR901) ················································ 21
3-11. Mini Disc Device (KMS-260B/J1N) ································ 21

···································································· 22

······························· 27

6-1.

Block Diagrams ································································ 37
Main Section ····································································· 37
Display/Power Supply Section ········································· 38

6-2.

Circuit Board Location ····················································· 39

6-3.

Printed Wiring Board   BD Section ·································· 40

6-4.

Schematic Diagram    BD Section (1/2) ··························· 41

6-5.

Schematic Diagram    BD Section (2/2) ··························· 42

6-6.

Schematic Diagram    BD Switch Section ························ 43

6-7.

Printed Wiring Board  BD Switch Section ······················· 43

6-8.

Printed Wiring Board     AD Section ································ 44

6-9.

Schematic Diagram    AD Section ···································· 45

6-10. Printed Wiring Board     DIO Section ······························ 46
6-11. Schematic Diagram    DIO Section ·································· 47
6-12. Printed Wiring Board    DA Section ································· 48
6-13. Schematic Diagram     DA Section ··································· 49
6-14. Printed Wiring Board    DIGITAL Section ······················· 50
6-15. Schematic Diagram     DIGITAL Section ························ 51
6-16. Schematic Diagram     HP Section ··································· 52
6-17. Printed Wiring Board     HP Section ································ 53
6-18. Schematic Diagram     POWER Section ·························· 54
6-19. Printed Wiring Board     POWER Section ························ 55
6-20. Printed Wiring Board     PANEL Section ························· 56
6-21. Schematic Diagram     PANEL Section ···························· 57
6-22. Printed Wiring Board     AC Section ································ 58
6-23. Schematic Diagram     AC Section ··································· 59
6-22. IC Block Diagrams ··························································· 61
6-23. IC PinFunction Description ·············································· 66

7-1.

Upper Case Assembly ······················································ 73

7-2.

Front Panel Assembly ······················································· 74

7-3.

Chassis Assembly ····························································· 75

7-4.

Mechanism Deck Assembly-1 (MDM-6J) ······················· 76

7-5.

Mechanism Deck Assembly-2 (MDM-6J) ······················· 77

7-6.

Base Unit (MBU-5J) ························································ 78

······································· 79

4

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.

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.

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

x  button.  When the test mode is set “[Check]” is displayed.

2. Turn the  l AMS L  knob and when “[Service]” is displayed, press the  YES  button.
3. Turn the  l AMS L  knob to display “Err Display”.
4. Press the  YES  button to sets the error history mode and displays “op rec tm”.
5. Select the contents to be displayed or executed using the  l AMS L  knob.
6. Press the  l AMS L  knob to display or execute the contents selected.
7. Press the  l AMS L  knob another time to return to step 4.
8. Press the  MENU/NO  button to display “Err Display” and release the error history mode.
9. To release the test mode, press the  REPEAT  button. The unit sets into the STANDBY state and the test mode ends.

C11/Protected

The inserted MD is record-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

The recording was not made properly.
 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

The deck could not read the TOC on the 
MD properly.
 Take out the MD and insert it again.

C14/Toc Error

The deck could not read the TOC on the 
MD properly.
 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.

E0101/
LASER NG

There is a problem with the optical 
pickup.
 The optical pickup may have failed. 

Consult your nearest Sony dealer.