Sony HCD-MD595 User manual

SERVICE MANUAL
COMPACT DISC DECK RECEIVER
SPECIFICATIONS
HCD-MD595
US Model
Canadian Model
AEP Model
UK Model
E Model
Australian Model
Chinese Model
Tourist Model
HCD-MD595 is the Amplifier, CD player, MD
Deck andTuner section in DHC-MD595.
– Continued on next page –
Model Name Using Similar Mechanism NEW
CD Mechanism Type CDM55A-21BD53
Base Unit Name BU-21BD53
Optical Pick-up Name OPAssy (A-MAX. 2)
Model Name Using Similar Mechanism NEW
MD Mechanism Type MDM-7X2A
Optical Pick-up Name KMS-262A/J1N
CD
Section
MD
Section
US and foreign patents licensed from Dolby
Laboratories.
CD player section
System Compact disc and digital audio
system
Laser Semiconductor laser (λ=800 nm)
Emission duration: continuous
Laser output Max. 44.6 µW*
* This output is the value
measured at a distance of 200 mm
from the objective lens surface on
the Optical Pick-up Block with a
7mm aperture.
Frequency response 2 Hz – 20 kHz
MD deck section
System MiniDisc digital audio system
Laser Semiconductor laser (λ=780 nm)
Emission duration: continuous
Laser output Max. 44.6 µW*
* This output is the value
measured at a distance of 200 mm
from the objective lens surface on
the Optical Pick-up Block with a
7 mm aperture.
Sampling frequency 44.1 kHz
Frequency response 5 Hz – 20 kHz
Tuner section
FM stereo, FM/AM superheterodyne tuner
FM tuner section
Tuning range
Tourist model: 76.0 – 108.0 MHz
(50 kHz step)
European model: 87.5 – 108.0 MHz
(50 kHz step)
Other models: 87.5 – 108.0 MHz
(100 kHz step)
Antenna FM lead antenna
Antenna terminals 75 ohms unbalanced
Intermediate frequency 10.7 MHz
Amplifier section
For the U.S. and Canadian models
AUDIO POWER SPECIFICATIONS
POWER OUTPUT AND TOTAL
HARMONIC DISTORTION:
With 6 ohm loads, both channels driven, from
120 – 10,000 Hz; rated 20 watts per channel minimum RMS
power, with no more than 0.9% total harmonic distortion from
250 milliwatts to rated output.
Continuous RMS power output:
25 + 25 watts (6 ohms at 1 kHz,
10% THD, 120 V) (Reference)
European model:
DIN power output (Rated):25 + 25 watts (6 ohms at 1 kHz,
DIN, 230 V)
Continuous RMS power output (Reference):
30 + 30 watts (6 ohms at 1 kHz,
10% THD, 230 V)
Music power output (Reference):
50 + 50 watts
Other models:
DIN power output (Rated):20 + 20 watts (6 ohms at 1 kHz,
DIN, 240 V)
18 + 18 watts (6 ohms at 1 kHz,
DIN, 220 V)
Continuous RMS power output (Reference):
25 + 25 watts (6 ohms at 1 kHz,
10% THD, 240 V)
23 + 23 watts (6 ohms at 1 kHz,
10% THD, 220 V)
Peak Music Power Output:400 watts
Inputs
TAPE IN (phono jacks): voltage 250 mV, impedance
47 kilohms
DIGITAL OPTICAL IN (Supported sampling frequencies:
32 kHz, 44.1 kHz and 48 kHz)
ANALOG IN (stereo minijack):
voltage 250 mV, impedance
47 kilohms
Outputs
TAPE OUT (phono jacks):voltage 250 mV, impedance
1 kilohm
PHONES (stereo minijack):
accepts headphones of 8 ohms or
more.
SPEAKER: accepts impedance of 6 to 16
ohms.
Ver. 1.1 2005.03
9-929-258-12
2005C05-1
© 2005.03
Sony Corporation
Audio Group
Published by Sony Engineering Corporation

2
AM tuner section
Tuning range
European model: 531 –1,602 kHz
(with the interval set at 9 kHz)
Other models: 531 –1,602 kHz
(with the interval set at 9 kHz)
530 –1,710 kHz
(with the interval set at 10 kHz)
Antenna AM loop antenna
External antenna terminals
Intermediate frequency 450 kHz
General
Power requirements
U.S.A. and Canadian models:
120 V AC, 60 Hz
Australian model: 220 –240 V AC, 50/60 Hz
Chinese model: 220 V AC, 50/60 Hz
European model: 230 V AC, 50/60 Hz
Other models: 110 –120 V or 220 –240 V
AC, 50/60 Hz
Power consumption
U.S.A. and Canadian models:
60 watts during normal operation
Other models: 70 watts during normal operation
Dimensions (w/h/d) incl. projecting parts and controls
Approx. 215 ×147 ×326 mm
Mass Approx. 5.0 kg
Design and specifications are subject to change
without notice.
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 Display
This system has a Self-diagnosis display function
to let you know if there is a system malfunction.
The display shows a code made up of three or five
letters and a message alternately to show you the
problem. To solve the problem refer to the
following list. If any problem persists, consult
your nearest Sony dealer.
C11/Protected
The MD is protected against erasure.
cRemove the MD and slide the tab to close the
slot.
C12/Cannot Copy
You tried to record a CD or MD with a format
that the system does not support, such as a CD-
ROM.
cRemove the disc and turn off the system once,
then turn it on again.
C13/REC Error
Recording could not be performed properly.
cMove the system to a stable place, and start
recording over from the beginning.
The MD is dirty or scratched, or the MD does
not meet the standards.
cReplace the MD and start recording over from
the beginning.
C13/Read Error
The MD deck cannot read the disc information
properly.
cRemove the MD once, then insert it again.
C14/Toc Error
The MD deck cannot read the disc information
properly.
cReplace the MD.
cErase all the recorded contents of the MD
using the All Erase function.
C41/Cannot Copy
The sound source is a copy of a commercially
available music software, or you tried to record
a CD-R (Recordable CD).
cThe Serial Copy Management System
prevents making a digital copy.
You cannot record a CD-R.
C71/Check OPT-IN
This appears momentarily because of the signal
of the digital broadcast during recording.
cThere is no affect on the recorded contents.
No component is connected to the DIGITAL
OPTICAL IN jack, or a digital component is
not connected properly.
cConnect a digital component to the DIGITAL
OPTICAL IN jack properly using a digital
connecting cable (not supplied).
The connected digital component is not turned
on.
cSee the operating instructions supplied with
the connected component and confirm
whether the component is turned on.
The digital connecting cable connected to the
DIGITAL OPTICAL IN jack is pulled out, or
the connected digital component is turned off
during digital recording.
cConnect the cable, or turn on the digital
component.
E0001/MEMORY NG
There is an error in the internal data that the
system needs in order to operate.
cConsult your nearest Sony dealer.
E0101/LASER NG
There is a problem with the optical pickup.
cThe optical pickup may have failed. Consult
your nearest Sony dealer.
MD SECTION
PROCEDURE FOR USINGTHE SELF-DIAGNOSIS FUNCTION (ERROR HISTORY DISPLAY MODE)
Note 1:About “R”
As this unit has only a few buttons, some operations require the use of remote commander (RM-S5EN/provided with unit: 1-476-086-21)
buttons. These operations are indicated as “R”in this manual.
Example: MENU/NO “R” ...Press the [MENU/NO] button of the remote commander.
Note 2:Incorrect operations may be performed if the MD test mode is not entered properly.
In this case, press the I/1button to turn the power off, and retry to enter the MD test mode.
Note 3:Perform the self-diagnosis function in the “error history display mode”in the MD 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 “R” button to exit the
mode.
Procedure:
1. Press the I/1button to turn the power on.
2. Press the [FUNCTION] button to set the MD function.
3. Press three buttons of M > , [PLAY MODE], and [MD ] simultaneously to enter the MD test mode and display “[Check]”.
4. Press the . m “R” or M > “R” button to display “[Service]”.
5. Press the ENTER/YES “R” button to display “AUTO CHECK”, and press the M > “R” button to display “Err Display”.
6. Press the ENTER/YES “R” button to enter the error history mode and display “op rec tm”.
7. Select the contents to be displayed or executed using the . m “R” or M > “R” button.
8. Press the [CD-MD SYNC NORMAL] button to light up “IT”indicator, then press the [REC MODE] button will display or execute the
contents selected.
9. Press the [REC MODE] button another time returns to step 7.
10. Press the MENU/NO “R” button displays “Err Display”and release the error history mode.
11. To release the MD test mode, press the [REPEAT] button to display “Initialize”and release the MD test mode.
Z

3
ITEMS OF ERROR HISTORY MODE ITEMS AND CONTENTS
Display Details of History
op rec tm Displays the recording time.
Displayed as “rssssssh”.
The displayed time is the total time the laser is set to the high power state.
This is about 1/4 of the actual recording time.
The time is displayed in decimal digits from 0h.
op play tm Displays the playback time.
Displayed as “p ssmin”. The displayed time is the total of the actual play time.
spdl rp tm Displays the spindle motor running time.
Displayed as “rssssssh”.
The time is displayed in decimal digits from 0h.
retry err Displays the total number of retries during recording and number of retry errors during play.
Displayed as “r ss p ss”.
“r”indicates the retries during recording while “p”indicates the retry errors during play.
The number of retries and retry errors are displayed in hexadecimal digits from 00 to FF.
total err Displays the total number of errors.
Displayed as “total ss”.
The number of errors is displayed in hexadecimal digits from 00 to FF.
err history Displays the 10 latest errors.
Displayed as “0sErrCd @@”.
sindicates the history number. The smaller the number, the more recent is the error. (00 is the latest)
@@ indicates the error code.
Refer to the following table for the details. The error history can be switched by pressing the . m “R” or
M > “R” button.
retry adrs Display the 5 latest retry address.
Display as “ss ADRS@@@@”.
ss indicates the history number. The smaller the number, the more recent is the error. (00 is the latest)
@@@@ indicates the cluster of retry address.
The number of retry address can be switched by pressing the . m “R” or M > “R” button.
er refresh Mode to clear the error history and retry address history.
Procedure:
1) Press the [REC MODE] button.
2) The display will change to “er refresh?”, and then press the ENTER/YES “R” button.
The operation is over if “Complete!”is displayed.
After this mode was executed, check the following:
•The data have been cleared.
•Perform the recording and playing to check that the mechanism operates normally.
tm refresh Mode to clear cumulative time of “op rec tm”and “op play tm”.
Procedure:
1) Press the [REC MODE] button.
2) The display will change to “tm refresh?”, and then press the ENTER/YES “R” button.
The operation is over if “Complete!”is displayed.
op change Mode to clear cumulative time of “op rec tm”and “op play tm”.
These historical data are used to determine the timing when the optical pick-up is to be replaced. When the
optical pick-up was replaced, perform this operation to clear historical data.
Procedure:
1) Press the [REC MODE] button.
2) The display will change to “op change?”, and then press the ENTER/YES “R” button.
The operation is over if “Complete!”is displayed.
spdl change Mode to clear cumulative time of “spdl rp tm”.
This historical data is used to determine the timing when the spindle motor is to be replaced. When the spindle
motor was replaced, perform this operation to clear historical data.
Procedure:
1) Press the [REC MODE] button.
2) The display will change to “spdl change?”, and then press the ENTER/YES “R” button.
The operation is over if “Complete!”is displayed.

4
Error Code Details of Error
10 Loading failed
12 Loading switch combination is illegal
20 Head of PTOC could not be read within the
specified time
21 Head of PTOC could be read but its content is
erroneous
22 Access to UTOC could not be made within the
specified time
23 UTOC could be not read within the specified
time
24 Content of UTOC is erroneous
30 Playing could not start
31 Content of sector is erroneous
40 Cause of retry occurred during normal recording
41 D-RAM overflowed and retry was executed
42 Retry was executed during the writing to TOC
43 S.F editing was interrupted by retry
50 Address could not be read except in access
processing
51 Focusing failed and it is out of control
60 Unlock retry
Table of Error Codes

5
CD SECTION
PROCEDURE FOR USING THE SELF-DIAGNOSIS
FUNCTION (ERROR HISTORY DISPLAY MODE)
1. To Enter The CD Test Mode
Procedure:
1. Press the I/1button to turn the power on.
2. Press the [FUNCTION] button to set the CD function.
3. Press three buttons of M > , [CD ], and [TUNER/BAND]
simultaneously.
4. The set enter the CD test mode (menu) and displays “dvt ERR
CODE”.
Note: If the triple button pressing failed to activate the CD test mode,
press the [CD ] button, and the [TUNER/BAND] button in this
order while pressing the M > button. Also, release the
[TUNER/BAND], [CD ], and M > buttons in this order, when
releasing the buttons.
If the consequence was diaplayed except “dvt ERR CODE”, press
the . m button to display “dvt ERR CODE”.
2. Display of Error Number
Procedure:
1. Press the [CD ] button to display as bellow.
(a) Number of mechanical error.
(b) Number of no disc error that occurred after chucking.
2. Press the x(CD) button and return to CD test mode menu
(“dvt ERR CODE”is displayed).
3. Display of Mechanical Error History
Procedure:
1. In the CD test mode menu, press the M > button to display
“dvt ECODE MEC”.
2. Press the [CD ] button to display as bellow.
(a) The number of mechanical error.
Latest one “00”to last ten “09”
(Press the . m or M > button to change the error
number)
(b) FF: Mechanical error, when normal operation.
Other display: Mechanical error, between mechanical initialize.
(c), (d), (e): Not used in servicing.
3. Press the x(CD) button and return to CD test mode menu
(“dvt ECODE MEC”is displayed).
Display
Emc=**Edc=**
(a) (b)
Z
Z
Z
Z
Display
E**M********00
(c)
(a) (b) (d) (e)
Z
4. Display of No Disc Error History
Procedure:
1. In the CD test mode menu, press the M > button to display
“dvt ECODE BU”.
2. Press the [CD ] button to display as bellow.
(a) The number of no disc error.
Latest one “00”to last ten “09”
(Press the . m or M > button to change the error
number)
(b) 01: Focus error
02: GFS error
03: Set up error
04: Focus error (not used in servicing)
(c) 00:No disc error (Did not chucking retry)
02: No disc error (Chucking retry to completion)
(d) The status, when determined no disc error.
2x: During setting up
3x: During reading TOC
4x: During accessing
5x: During playback
6x: During pause
7x: During manual search (during playback)
8x: During manual search (during pause)
3. Press the x(CD) button and return to CD test mode menu
(“dvt ECODE BU”is displayed).
4. To EraseThe Error History
When returning the unit to the customer after completing repairs,
perform this to erase the past error history.
Procedure:
1. In the CD test mode menu, press the M > button to display
“dvt ECNT0 MEC”. (When erase the mechanical error)
Or one more press the M > button to display “dvt ECNT0
BU”. (When erase the no disc error)
2. Press the [CD ] button to erase the error history (mechanical
error or no disc error) and display as bellow.
5. To ReleaseThe CDTest Mode
Press the I/1button to turn the power off.
Z
Display
E**D********
(c)
(a) (b) (d) (e)
Z
Display
Emc=00Edc=00

6
TABLE OF CONTENTS
SELF-DIAGNOSIS FUNCTION..................................... 2
1. SERVICING NOTES............................................... 8
2. GENERAL ................................................................... 19
3. DISASSEMBLY ......................................................... 23
4. TEST MODE ............................................................... 32
5. ELECTRICAL ADJUSTMENTS
MD Section ..................................................................... 37
CD Section ...................................................................... 48
6. DIAGRAMS
6-1. Block Diagram –MD SERVO Section –....................... 51
6-2. Block Diagram –D/A, A/D CONVERTER Section –... 52
6-3. Block Diagram –MAIN Section .................................... 53
6-4. Block Diagram
–DISPLAY, POWER SUPPLY Section –..................... 54
6-5. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 55
6-6. Printed Wiring Board –BD (CD) Board –..................... 56
6-7. Schematic Diagram –BD (CD) Board –........................ 57
6-8. Schematic Diagram –BD (MD) Board (1/2) –.............. 58
6-9. Schematic Diagram –BD (MD) Board (2/2) –.............. 59
6-10. Printed Wiring Board –BD (MD) Board –.................... 60
6-11. Schematic Diagram –MD DIGITAL Board (1/3) –...... 61
6-12. Schematic Diagram –MD DIGITAL Board (2/3) –...... 62
6-13. Schematic Diagram –MD DIGITAL Board (3/3) –...... 63
6-14. Printed Wiring Board
–MD DIGITAL Board (Component Side) –................. 64
6-15. Printed Wiring Boards
–MD DIGITAL (Conductor Side)/
LOADING Boards –....................................................... 65
6-16. Schematic Diagram
–MAIN (1/2)/RDS IC Boards –..................................... 66
6-17. Schematic Diagram –MAIN Board (2/2) –.................. 67
6-18. Printed Wiring Boards –MAIN/RDS IC Boards –...... 68
6-19. Printed Wiring Board –SP Board –.............................. 69
6-20. Schematic Diagram –SP Board –.................................. 69
6-21. Printed Wiring Board –AMP Board –.......................... 70
6-22. Schematic Diagram –AMP Board –............................. 71
6-23. Printed Wiring Boards –PANEL/BL Boards –............. 72
6-24. Schematic Diagram –PANEL/BL Boards –................ 73
6-25. Printed Wiring Board –POWER Board –..................... 74
6-26. Schematic Diagram –POWER Board –........................ 75
6-27. IC Pin Function Description ........................................... 81
7. EXPLODED VIEWS................................................ 93
8. ELECTRICAL PARTS LIST ............................... 99
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.
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK 0OR DOTTED
LINE WITH MARK 0ON 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 PUB-
LISHED BY SONY.
ATTENTION AU COMPOSANT AYANT RAPPORT
À LA SÉCURITÉ!
LES COMPOSANTS IDENTIFIÉS PAR UNE MARQUE 0
SUR LES DIAGRAMMES SCHÉMATIQUES ET LA LISTE
DES PIÈCES SONT CRITIQUES POUR LA SÉCURITÉ
DE FONCTIONNEMENT. NE REMPLACER CES COM-
POSANTS QUE PAR DES PIÈCES SONY DONT LES
NUMÉROS SONT DONNÉS DANS CE MANUEL OU
DANS LES SUPPLÉMENTS PUBLIÉS PAR SONY.

7
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k Ω 0.15 µF
AC
voltmete
r
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground
SAFETY CHECK-OUT
After correcting the original service problem, perform the follow-
ing safety check 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 TEST
TheAC 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”indica-
tion is 0.75 V, so analog meters must have an accurate low-
voltage scale. The Simpson 250 and Sanwa SH-63Trd are ex-
amples of a passive VOM that is suitable. Nearly all battery
operated digital multimeters that have a 2 V AC range are
suitable. (See Fig. A)
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.
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.
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.
Hävitäkäytetty paristo valmistajan ohjeiden mukaisesti.
ADVARSEL!
Lithiumbatteri-Eksplosionsfare ved fejlagtig håndtering.
Udskiftning måkun 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.
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous ra-
diation exposure.

8
SECTION 1
SERVICING NOTES
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.
For CD
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.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
Carry out the “S curve check” in “CD section adjustment” and
check that the S curve waveforms is output three times.
For MD
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.
CLEANING OBJECTIVE LENS OF OPTICAL PICK-UP
• In cleaning the objective lens of optical pick-up, be sure the
following below.
1. In cleaning the lens, do not apply an excessive force.
As the optical pick-up is vulnerable, application of excessive
force could damage the lens holder.
2. In cleaning, do not use a cleaner other than exclusive cleaning
liquid (KK-91 or isopropyl alcohol).
3. Wipe the objective lens spirally from center toward outside.
(See Figure A)
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
MODEL IDENTIFICATION
— Back panel —
(Figure A)
4. Eject the disk, if loaded.
5. Disconnect the power cord from the socket to shut off the power
supply.
6. When cleaning the objective lens of optical pick-up in CD,
refer to “HOLDER (BU) ASS’Y” on page 29 for removing
HOLDER (BU) ASS’Y.
PART No.
Model Part No.
AEP, UK and
North European models 4-228-095-1[]
US and Canadian models 4-228-095-2[]
Australian model 4-228-095-5[]
Malaysia, Singapore, Hong Kong
and Tourist models 4-228-111-3[]

9
SERVICE POSITION
• In checking the MD mechanism deck section (MDM-7X2A), prepare two extension jigs (Part No. J-2501-100-A: 1.00 mm 27 core and
Part No. J-2501-198-A: 1.00 mm 17 core).
• In checking the CD mechanism deck section (CDM55A-21BD53), prepare extension jig (Part No. J-2501-075-A: 1.00 mm 21 core.)
MD mechanism deck section
(MDM-7X2A)
CN103
BD (MD) board
CD mechanism deck section
(CDM55A-21BD53)
Connect extension jig (J-2501-198-A) to the
BD (MD) board (CN103) and MD DIGITAL board (CN1004).
Connect extension jig (J-2501-100-A) to the
BD (MD) board (CN102) and MD DIGITAL board (CN1003).
CN1004
CN1003
CN101
BD (CD) board CN1005 CN1002
MD DIGITAL board
Connect extension jig (J-2501-075-A)
to the BD (CD) board (CN101) and
MD DIGITAL board (CN1002).
CN1005
Pin 2(GND)
Pin 3(OUTSW)
CN102
harness
Note on Checking CD Mechanism Deck Section
In performing the operation check with the CD mechanism deck section removed from the main unit, the CD disc loading will be disabled
if the connector cable between MD DIGITAL board (CN1005) and LOADING board (CN151) is disconnected. Accordingly, make
preparation through the following steps.
1. Insert the CD disc for test with the set assembled.
2. Unplug the AC power cord to turn the power off, and remove the CD mechanism deck section. (Disconnect the connector cable
between MD DIGITAL board (CN1005) and LOADING board (CN151), and also the connector cable between MD DIGITAL board
(CN1002) and BD (CD) board (CN101))
3. Connect the CN1005 pin 3(OUTSW) and pin 2(GND) on the MD DIGITAL board with a lead wire.
4. Connect the connectors between MD DIGITAL board (CN1002) and BD (CD) board (CN101) with the extension tool (part No.: J-
2501-075-A).
Note 1:Under this condition, the CD can be played but the disc loading operation is disabled.
Note 2:After checking, disconnect the lead wire connected in step 3.

10
MC COLD RESET
• The cold reset clears all data including preset data stored in the RAM to initial conditions. Execute this mode when returning the set to
the customer.
Procedure:
1. Press the I/1button to turn the power on.
2. Press three buttons of . m , [REC MODE], and x(CD) simultaneously.
3. The set is reset, and displays “COLD RESET”, then becomes standby status.
AMPTEST
Procedure:
1. Press the I/1button to turn the power on.
2. Press three buttons of M > , [REC MODE], and N X (MD) simultaneously.
3. Each buttons are pressed, it changes display as follows.
Button Display
x(CD) 7[TESTMIN]
REC MODE 8[TESTMID]
x(MD) 9[TESTMAX]
4. [VOLUME] knob is turned, it changes display as follows.
Turn Direction Display
clockwise VOLUME MIN
center VOLUME 21
counterclockwise VOLUME MAX
5. To release from this mode, press the I/1button to turn the power off and cold reset.
VERSION DISPLAY
Procedure:
1. Press the I/1button to turn the power on.
2. Press three buttons of M > , [REC MODE], and [TUNER/BAND] simultaneously.
3. Enter the version display mode and display STR version.
4. Each time the x(MD) button is pressed, it changes display STR version → CD version → MD version → STR version → ...
5. To release from this mode, press the I/1button to turn the power off.
LCD AND LEDTEST
Procedure:
1. Press the I/1button to turn the power on.
2. Press three buttons of M > , [REC MODE], and N X (CD) simultaneously.
3. Liquid crystal display and LEDs are all turned on.
4. Each time the x(MD) button is pressed, it changes display all turned on → all turned off → pattern 1 → pattern 2 → all turned on → ...
5. Each time the x(CD) button is pressed, it changes LED indication all turned on → all turned off →“I/1” → “REC”→ “N”(CD)
→ “X” (CD) → “N”(MD) → “X”(MD) → all turned on → ...
6. To release from this mode, press the I/1button to turn the power off.
KEYTEST
Procedure:
1. Press the I/1button to turn the power on.
2. Press three buttons of . m , [CD ], and [MD ] simultaneously.
3. Enter the key test mode and display “KEY00 VOL0”.
4. Each time a button is pressed, “KEY” value increases. However, once a button is pressed, it is no longer taken into account.
“VOL” value increases like 0, 1, 2 ... if turn the [VOLUME] knob clockwise, or it decreases like 9, 8, 7 ... if turn the [VOLUME] knob
counterclockwise.
5. To release from this mode, press three buttons in the same manner as step 2 , or disconnect the power cord.
ZZ

11
MD SECTION
JIG FOR CHECKING BD (MD) BOARD WAVEFORM
The special jig (J-2501-196-A) is useful for checking the waveform of the BD (MD) board. The names of terminals and the checking items
to be performed are shown as follows.
GND : Ground
I+3V : For measuring IOP (Check the deterioration of the optical pick-up laser)
IOP : For measuring IOP (Check the deterioration of the optical pick-up laser)
TE : Tracking error signal (Traverse adjustment)
VC : Reference level for checking the signal
RF : RF signal (Check jitter)
FE : Focus error signal
I+3V
CN105
IOP
TE
VC
GND
FE RF
I+3V
IOP
GND
TE
FE
VC
RF
I+3V
IOP
GND
TE
FE
VC
RF
1
7
for
MDM-7X2
A

12
Note 1:About “R”
As this unit has only a few buttons, some operations require the use of remote commander (RM-S5EN/provided with unit: 1-476-086-21)
buttons. These operations are indicated as “R” in this manual.
Example: MENU/NO “R” ... Press the [MENU/NO] button of the remote commander.
Note 2:Incorrect operations may be performed if the MD test mode is not entered properly.
In this case, press the I/1button to turn the power off, and retry to enter the MD test mode.
IOP DATA RECORDING AND DISPLAY WHEN OPTICAL PICK-UP AND NON-VOLATILE MEMORY (IC195 OF BD
(MD) BOARD) ARE REPLACED
The IOP value labeled on the optical pick-up can be recorded in the non-volatile memory. By recording the value, it will eliminate the need
to look at the value on the label of the optical pick-up. When replacing the optical pick-up or non-volatile memory (IC195 of BD (MD)
board), record the IOP value on the optical pick-up according to the following procedure.
Record Procedure:
1. Press the I/1button to turn the power on.
2. Press the [FUNCTION] button to set the MD function.
3. Press three buttons of M > , [PLAY MODE], and [MD ] simultaneously to enter the MD test mode and display “[Check]”.
4. Press the . m “R” or M > “R” button to display “[Service]”.
5. Press the ENTER/YES “R” button to display “AUTO CHECK”, and press the M > “R” button to display “Iop Write”.
6. Press the ENTER/YES “R” button.
7. The display becomes “Ref= @@@.@” (@ is an arbitrary number) and the numbers which can be changed will blink.
8. Input the IOP value written on the optical pick-up.
To select the number : Press the . m “R” or M > “R” button.
To select the digit : Press the [REC MODE] button.
9. When the ENTER/YES “R” button is pressed, the display becomes “Measu=@@@.@” (@ is an arbitrary number).
10. As the adjustment results are recorded for the step 9 value. Leave it as it is and press the ENTER/YES “R” button.
11. “Complete!” will be displayed momentarily. The value will be recorded in the non-volatile memory and the display will become “Iop
Write”.
12. Press the [REPEAT] button to complete. “Initialize” will be displayed and release the MD test mode.
Display Precedure:
1. Press the I/1button to turn the power on.
2. Press the [FUNCTION] button to set the MD function.
3. Press three buttons of M > , [PLAY MODE], and [MD ] simultaneously to enter the MD test mode and display “Check”.
4. Press the . m “R” or M > “R” button to display “Service”.
5. Press the ENTER/YES “R” button to display “AUTO CHECK”, and press the M > “R” button to display “Iop Read”.
6. Press the ENTER/YES “R” button.
7. “@@.@/##.#” is displayed and the recorded contents are displayed.
@@.@ : Indicates the Iop value labeled on the pick-up.
##.# : Indicates the Iop value after adjustment.
8. Press the [REPEAT] button to complete. “Initialize” will be displayed and release the MD test mode.
WHEN MEMORY NG IS DISPLAYED
If the nonvolatile memory data is abnormal, “E001 MEMORY NG” will be displayed so that the MD deck does not continue operations.
In this case, set the test mode promptly and perform the following procedure.
Procedure:
1. Enter the MD test mode (refer to page 32).
2. Normally a message for selecting the test mode will be displayed. However if the nonvolatile memory is abnormal, the following will be
displayed “INIT EEP?”.
3. Press the x(MD) and [MD ] buttons simultaneously.
4. Press the . m “R” or M > “R” button to display “MDM-7X2A”.
5. Press the ENTER/YES “R” button. If the nonvolatile memory is successfully overwritten, the normal MD test mode will be set and a
message to select the MD test mode will be displayed.
Z
Z
Z

13
CHECKS PRIORTO PARTS REPLACEMENT AND ADJUSTMENTS IN MD
Before performing repairs, perform the following checks to determine the faulty locations up to a certain extent.
Details of the procedures are described in “5 Electrical Adjustments”.
• 0.9 mW power
Specified value : 0.84 to 0.92 mW
• 7.0 mW power
Specified value : 6.8 to 7.2 mW
Iop (at 8.4mW)
• Labeled on the optical pick-up
Iop value ± 10mA
• Traverse waveform
Specified value : Below 10% offset
• Error rate check
Specified value : For points A and B
C1 error : About 200
AD error : below 2
For point C
C1 error: 20
AD error: below 2
• Error rate check
Specified value:
a. When using test disc (MDW-74/GA-1)
C1 error : Below 20
AD error : 00
b. When using check disc (TDYS-1)
C1 error : Below 20
• CPLAY error rate check
Specified value:
C1 error : Below 20
AD error : Below 2
• Unsatisfactory if displayed as T=@@ (##) [NG]”
NG
(@@, ## are both arbitrary numbers)
Laser power check
(6-2 : See page 40)
Traverse check
(6-6 : See page 41)
Focus bias check
(6-7 : See page 42)
C PLAY check
(6-8 : See page 42)
Self-recording/playback
check
(6-9 : See page 42)
Temperature
compensation
offset check
(6-1 : See page 40)
Criteria for Determination
(Unsatisfactory if specified value is not satisfied)
• Clean the optical pick-up
• Adjust again
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
• Replace the optical pick-up
If always unsatisfactory:
• Replace the overwrite head
• Check for disconnection of the circuits around the
overwrite head
If occasionally unsatisfactory:
• Check if the overwrite head is distorted
• Check the mechanism around the sled
• Check for disconnection of the circuits around
D101 (BD (MD) board)
• Check the signals around IC101, IC151, CN102,
CN103 (BD (MD) board)
Measure if unsatisfactory
Note:
The criteria for determination above is intended merely to determine if satisfactory or not, and does not serve as the specified value for adjustments.
When performing adjustments, use the specified values for adjustments.

14
RETRY CAUSE DISPLAY MODE IN MD
• In this test mode, the causes for retry of the unit during recording can be displayed on the liquid crystal display. 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.
Precedure:
1. Load a recordable disc whose contents can be erased into the unit.
2. Press the MENU/NO “R” button. When “Edit Menu” is displayed on the liquid crystal display, press the . m “R” or
M > “R” button to display “All Erase?”.
3. Press the ENTER/YES “R” button.
4. When “All Erase??” is displayed on the liquid crystal display, the music calendar number blinks.
5. Press the ENTER/YES “R” button to display “Complete!”.
6. Press the [REC/REC IT] button to start recording. Then press the N X (MD) button and start recording. If recording cannot be
performed, press the [FUNCTION] button and set a different function.
7. Press three buttons of . m , [PLAY MODE] and N X (MD) simultaneously to enter the retry cause display mode.
8. To check the “track mode”, press the N X (MD) button to start playback.
9. To release this mode, press the I/1button to turn the power off. When “TOC” goes off, disconnect the power plug from the outlet.
If the test mode cannot be released, refer to “MC COLD RESET” on page 10.
Fig. 1 Reading theTest Mode Display
(During recording and stop)
RTs@@c##e**
Liquid crystal display
@@ : Cause of retry
## : Number of retries
** : Number of retry errors
Fig. 2 Reading theTest Mode Display
(During playback)
@@ ###** $$
Liquid crystal display
@@ : Parts No. (name of area named on TOC)
## : Cluster
** : Sector
$$ : Track mode (Track information such as copy-
right information of each part)
Reading the Retry Cause Display
84218421
b7 b6 b5 b4 b3 b2 b1 b0
00000001
00000010
00000100
00001000
00010000
00100000
01000000
10000000
Hexa-
decimal Cause of Retry
01
02
04
08
10
20
40
80
Higher Bits Lower Bits
Hexadecimal
Bit
Binary shock
ader5
Discontinuous address
DIN unlock
FCS incorrect
IVR rec error
CLV unlock
Access fault
Occurring conditions
When track jump (shock) is detected
When ADER was counted more than five times
continuously
When ADIP address is not continuous
When DIN unlock is detected
When not in focus
WhenABCD signal level exceeds the specified range
When CLV is unlocked
When access operation is not performed normally
Reading the Display:
Convert the hexadecimal display into binary display. If more than two causes, they will be added.
Example
When 42 is displayed:
Higher bit: 4 = 0100 tb6
Lower bit : 2 = 0010 tb1
In this case, the retry cause is combined of “CLV unlock” and “ader5”.
When A2 is displayed:
Higher bit: A = 1010 tb7 + b5
Lower bit : 2 = 0010 tb1
The retry cause in this case is combined of “Access fault”, “IVR rec error”, and “ader5”.


Address

15
Reading the Retry Cause Display
84218421
b7 b6 b5 b4 b3 b2 b1 b0
00000001
00000010
00000100
00001000
00010000
00100000
01000000
10000000
Hexa-
decimal Details
01
02
04
08
10
20
40
80
Higher Bits Lower Bits
Hexadecimal
Bit
Binary When 0
Emphasis OFF
Monaural
This is 2-bit display. Normally 01.
01:Normal audio. Others:Invalid
Audio (Normal)
Original
Copyright
Write prohibited
When 1
Emphasis ON
Stereo
Invalid
Digital copy
No copyright
Write allowed
Reading the Display:
Convert the hexadecimal display into binary display. If more than two causes, they will be added.
Example When 84 is displayed:
Higher bit: 8 = 1000 tb7
Lower bit : 4 = 0100 tb2
In this case, as b2 and b7 are 1 and others are 0, it can be determined that the retry cause is combined of “Emphasis OFF”, “Monaural”,
“Original”, “Copyright”, and “Write allowed”.
Example When 07 is displayed:
Higher bit: 0 = 0000 tAll 0
Lower bit : 7 = 0111 tb0 + b1 + b2
In this case, as b0, b1, and b2 are 1 and others are 0, it can be determined that the retry cause is combined of “Emphasis ON”, “Stereo”,
“Original”, “Copyright”, and “Write prohibited”.
Hexadecimal t Binary ConversionTable
Hexadecimal Binary Hexadecimal Binary
0 0000 8 1000
1 0001 9 1001
2 0010 A 1010
3 0011 B 1011
4 0100 C 1100
5 0101 D 1101
6 0110 E 1110
7 0111 F 1111

16
CD SECTION
CD AGING MODE
Procedure:
1. Press the I/1button to turn the power on.
2. Press the [FUNCTION] button to set the CD function, and press the [CD ] button to insert a disc.
3. Press three buttons of M > , [CD ], and x(MD) simultaneously.
4. The set displays “AGING SEL=00”. Between it is displayed, press the [CD ] button to start CD aging mode.
5. The sequence during the CD aging mode is following as below.
Note: If the triple button pressing failed to activate the CD test mode, press the [CD ] button, and the x(MD) button in this order while pressing the
M > button. Also, release the x(MD), [CD ], and M > buttons in this order, when releasing the buttons.
If the consequence was that display “AGING SEL=01”, press the . m button to display “AGING SEL=00”. “AGING SEL=01” is not used in
servicing.
CD aging mode sequence:
6. To release from this mode, press the I/1button to turn the power off.
Note: Refer to “Error History Display Mode” (page 5) for display at an error occurred.
CD disk tray open
CD disc tray close
TOC read
Playback track 1
Playback last track
Display aging number
Z
Z
Z
Z
Z

17
CD-TEXTTEST DISC
This unit is able to display the test data (character information) written in the CD on its fluorescent indicator tube.
The CD-TEXT TEST DISC (TGCS-313:4-989-366-01) is used for checking the display.
To check, perform the following procedure.
Checking Method:
1. Press the I/1button to turn the power on, set the disc to the disc table with the “test disc” label facing up, and chuck the disc.
2. Press the N X (CD) button and playback the disc.
3. The following will be displayed on the liquid crystal display.
Display : 1kHz/0db/L&R
4. Pressing the . m or M > button, select the track. The text data of each track will be displayed.
For details of the displayed contents for each track, refer to “Table 1 : CD-TEXT TEST DISC TEXT Data Contents” and “Table 2 : CD-
TEXT TEST DISC Recorded Contents and Display”.
Restrictions in CD-TEXT Display
In this unit, some special characters will not be displayed properly. These will be displayed as a space or a character resembling it. For
details, refer to “Table 2 : CD-TEXT DISC Recorded Contents and Display”.
Table 1 : CD-TEXTTEST DISCTEXT Data Contents (TRACKS No. 1 to 41:Normal Characters)
1 1kHz/0dB/L&R 22 1kHz/–90dB/L&R
2 20Hz/0dB/L&R 23 Infinity Zero w/o emphasis//L&R
3 40Hz/0dB/L&R 24 Infinity Zero with emphasis//L&R
4 100Hz/0dB/L&R 25 400Hz+7kHz(4:1)/0dB/L&R
5 200Hz/0dB/L&R 26 400Hz+7kHz(4:1)/–10dB/L&R
6 500Hz/0dB/L&R 27 19kHz+20kHz(1:1)/0dB/L&R
7 1kHz/0dB/L&R 28 19kHz+20kHz(1:1)/–10dB/L&R
8 5kHz/0dB/L&R 29 100Hz/0dB/L*
9 7kHz/0dB/L&R 30 1kHz/0dB/L*
10 10kHz/0dB/L&R 31 10kHz/0dB/L*
11 16kHz/0dB/L&R 32 20kHz/0dB/L*
12 18kHz/0dB/L&R 33 100Hz/0dB/R*
13 20kHz/0dB/L&R 34 1kHz/0dB/R*
14 1kHz/0dB/L&R 35 10kHz/0dB/R*
15 1kHz/–1dB/L&R 36 20kHz/0dB/R*
16 1kHz/–3dB/L&R 37 100Hz Squer Wave//L&R
17 1kHz/–6dB/L&R 38 1kHz Squer Wave//L&R
18 1kHz/–10dB/L&R 39 1kHz w/emphasis/–0.37dB/L&R
19 1kHz/–20dB/L&R 40 5kHz w/emphasis/–4.53dB/L&R
20 1kHz/–60dB/L&R 41 16kHz w/emphasis/–9.04dB/L&R
21 1kHz/–80dB/L&R
TRACK
No. Displayed Contents
Note: The contents of Track No. 1 to 41 are the same as those of the current TEST DISC-their titles are displayed.
TRACK
No. Displayed Contents

18
Table 2: CD-TEXTTEST DISC Recorded Contents and Display
(In this unit, some special characters cannot be displayed. This is not a fault)
TAll the same
TAll the same
TAll the same
TAll the same
TAll the same
TAll the same
TAll the same
TAll the same
TAll the same
TAll the same
TAll the same
TAll the same (A0h to A7h) 8859-1
(A8h to AFh)
(B0h to B7h)
(B8h to BFh)
AAAAAA C (C0h to C7h)
E E E E I I I I (C8h to CFh)
DNOOOOO (D0h to D7h)
O UU U U Y (D8h to DFh)
a a a a a a c (E0h to E7h)
eeeeiiii (E8h to EFh)
dnooooo (F0h to F7h)
o u u u u y y (F8h to FFh)
TAll the same
TAll the same
to
TAll the same
TRACK
No. Recorded contents
´
′
*
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
to
99
! ” # $ %& ´ (21h to 27h)1kHz 0dB L&R
( ) + , – . / (28h to 2Fh)
01234567 (30h to 37h)
8 9 : ; < = > ? (38h to 3Fh)
@A B C D E F G (40h to 47h)
H I J K L MNO (48h to 4Fh)
P QR S T U VW (50h to 57h)
X Y Z [ ¥ ] ^ _ (58h to 5Fh)
a b c d e f g (60h to 67h)
h i j k l m n o (68h to 6Fh)
p q r s t u v w (70h to 77h)
xyz{I } (78h to 7Fh)
i¢£¤¥ § (A0h to A7h) 8859-1
Cª¬PR–(A8h to AFh)
•±23 µ¶ • (B0h to B7h)
†1º¿ (B8h to BFh)
ÀÁÂÃÄÅÆÇ (C0h to C7h)
ÈÉÊËÌÍÎÏ (C8h to CFh)
DÑÒÓÔÕÖ (D0h to D7h)
ØÙÚÛÜY ß (D8h to DFh)
àáâãäåæç (E0h to E7h)
èéêëìíîï (E8h to FFh)
∂ñòóôõö÷(F0h to F7h)
øùúûüy ÿ (F8h to FFh)
No.66
No.67
to
No.99
˙
~
′
1
41 23 4
Display

19
SECTION 2
GENERAL
LOCATION OF CONTROLS
• Front View
1I/1 button and indicator
2Remote sensor
3MD disc slot
4MD Zbutton
5NX(MD) button and indicator
6x(MD) button
7CD disc tray
8CD Zbutton
9NX(CD) button and indicator
0x(CD) button
12 3 465
789 0
qsqa qdqf
qh qj
qg
qkqlw;wa wswd
qa ANALOG IN jack
qs Liquid crystal display
qd .m/M>(MD/CD), TUNING +/– buttons
qf TUNER/BAND button
qg VOLUME knob
qh PHONES jack
qj FUNCTION button
qk PLAY MODE, TUNING MODE button
ql REPEAT, STEREO/MONO button
w; REC MODE button
wa REC/REC IT button
ws CD-MD SYNC NORMAL button
wd CD-MD SYNC HIGH button

20
• Rear View
8796
12 5 43
1PC LINK jack
2TAPE IN/OUT jacks
3SPEAKER IMPEDANCE USE 6-16 Ωterminals
4Cooling fan
5AM ANTENNA terminals
6TAPE CONTROL jack
7DIGITAL OPTICAL IN jack
8FM 75 Ωjack
9Power cord
• Liquid Crystal Display
1243 56
7 8 90
1CD/MD, Sound level indicators
2TOC, TEXT, DBFB indicators
3Tuner mode indicators
4CD/MD play mode indicators
5, 6Text information (clock, disc name, play time, etc.) indicator
7S.F EDIT indicator
8REC indicators
9REC mode indicators
0Timer indicators