Sony HCD-MD1EX - System User manual

SERVICE MANUAL
CD Model Name Using Similar Mechanism HCD-MD333
Section Base Unit Name BU-22BD19
Optical Pick-up Name KSS-213B/K-N
MD Model Name Using Similar Mechanism HCD-MD333
Section Mechanism Name MDM-3J
Optical Pick-up Name KMS-260A/J1N
COMPACT Hi-Fi COMPONENT SYSTEM
US Model
Canadian Model
AEP Model
UK Model
E Model
SPECIFICATIONS
HCD-MD1EX
HCD-MD1EXistheAmplifier,CDplayer,
Mini disc Deck and Tuner section in
CMT-MD1.
– Continued on next page –
U.S. and foreign patents licensed form Dolby Laboratories
Licensing Corporation.
Ver 1.1 2001.02
9-922-950-12 Sony Corporation
2001B0500-1 Audio Entertainment Group
C2001.2 General Engineering Dept.

– 2 –

– 3 –
SELF-DIAGNOSIS FUNCTION
The self-diagnosis function consists of error codes for users 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 users, refer to the following box in the
instruction manual. For details on how to perform checks during servicing, refer to the following “Procedure for Using the Self-Diagnosis
Function (Error History Display Mode)”.
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 steps. Be careful
not to enter other modes by mistake. If other modes are set accidentally, press the ^(CD) button to exit that mode.
1. With the power off, press the =0 button while pressing the [VOLUME–] button.
2. Press the [VOLUME+/–] button to display “ERR DP MODE”.
3. Pressing the p(CD) button sets the error history mode and displays “total rec”.
4. Select the contents to be displayed or executed with pressing the [VOLUME+/–] button.
5. Pressing the 6(CD) button displays or executes the contents selected.
6. Pressing the 6(CD) button another time returns to step 4.
7. Pressing the ^(CD) button displays “ERR DP MODE” and exits the error history mode.
8. To exit the test mode, press the p(MD) button while pressing the [FUNCTION] button.
The unit sets into the STANDBY state, and the test mode ends.

– 4 –
Displays the recording time in the form of “rππππππh”.
The displayed time is the total number of hours the laser is high power, which is about one-fourth of the actual
recording time. The time is displayed in decimal digits between 0h to 65535h.
Displays the playback time in the form of “pππππππh”.
The displayed time is the total actual play time. The paused time is not counted. The time is displayed in
decimal digits between 0h to 65535h.
Displays the total number of retries during recording and retry errors during playback in the form of “rππpππ”.
“r” indicates the retries during recording while “p” indicates the retry errors during playback. The number of
retries is displayed in hexadecimal digits between 00 to FF.
Displays the total number of errors in the form of “total ππ”.
The number of errors is displayed in hexadecimal digits between 00 to FF.
Displays the 10 latest errors in the form of “0πE@@”.
The πindicates the history number. The smaller the number, the newer is the error. (00 is the latest error.)
The @@ indicates the error code. Refer to the following table for details. Press the [VOLUME+/–] button to
switch the error history.
Mode which erases all the error histories.
The error history serves as a reference for when to replace the optical pick-up. Perform this procedure when the
optical pick-up has been replaced in order to erase past error histories and not at other times. Press the p(CD)
button when “er refresh??” is displayed. The history will be erased and “Complete!” will be displayed momen-
tarily. Be sure to check the following when this mode has been executed.
• Check that the data has been erased.
• Perform recording and playback, and check that the mechanism operates normally.
ITEM OF ERROR HISTORY MODE ITEMS AND CONTENTS
Selecting theTest Mode
Display
total rec
total play
retry err
total err
err history
er refresh?
Details of History
No error
Disc error. Cannot read PTOC
(Disc is ejected out)
Disc error. UTOC error
(Disc is not ejected out)
Loading error
Cannot read address (Servo has deviated)
Table of Error Codes
Error Code
E00
E01
E02
E03
E04
E05
E06
E07
E08
E09
E0A
FOK has deviated
Unfocused (Servo has deviated)
Recording retry
Recording retry error
Play retry error
(Access error)
Playback retry error (C2 error)
Details of Error Error Code Details of Error

– 5 –
TABLE OF CONTENTS
SELF-DIAGNOSIS FUNCTION ................................... 3
1. SERVICING NOTES .............................................. 6
2. GENERAL .................................................................. 9
3. DISASSEMBLY ......................................................... 12
4. SERVICE MODE...................................................... 19
5. TEST MODE.............................................................. 20
6. ELECTRICAL ADJUSTMENTS
MD Section ..................................................................... 26
CD Section ...................................................................... 31
7. DIAGRAMS
7-1. Block Diagram – CD Section – ..................................... 33
7-2. Block Diagram – MD Section – .................................... 35
7-3. Block Diagram – MAIN Section – ................................ 37
7-4. Block Diagram
– DISPLAY/POWER SUPPLY Section – ..................... 39
7-5 Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 42
7-6. Printed Wiring Board – BD (CD) Section –.................. 43
7-7. Schematic Diagram – BD (CD) Section –...................... 45
7-8. Printed Wiring Board – BD (MD) Section –................. 47
7-9. Schematic Diagram – BD (MD) Section (1/3) –............ 49
7-10. Schematic Diagram – BD (MD) Section (2/3) –............ 51
7-11. Schematic Diagram – BD (MD) Section (3/3) –............ 53
7-12. Printed Wiring Board – MAIN Board (side A) – .......... 55
7-13. Printed Wiring Board – MAIN Board (side B) – .......... 57
7-14. Schematic Diagram – MAIN Section (1/2) –................ 59
7-15. Schematic Diagram – MAIN Section (2/2) –................ 61
7-16. Printed Wiring Boards – PANEL Section – .................. 63
7-17. Schematic Diagram – PANEL Section –........................ 65
7-18. Printed Wiring Boards
– AMP/TRANSFORMER Section – .............................. 67
7-19. Schematic Diagram
– AMP/TRANSFORMER Section – .............................. 69
7-20. Printed Wiring Board – POWER Section –................... 71
7-21. Schematic Diagram – POWER Section – ...................... 73
7-22. Printed Wiring Boards – MOTOR/SW Section – ......... 75
7-23. Schematic Diagram – MOTOR/SW Section – ............... 76
7-24. IC Pin Function Description ........................................... 86
8. EXPLODED VIEWS................................................ 96
9. ELECTRICAL PARTS LIST .............................103

– 6 –
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.
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.
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.
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.
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.
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.
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.
NOTES ON HANDLING THE OPTICAL PICK-UP
BLOCK OR BASE UNIT
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY A !MARK ONTHE SCHEMATIC
DIAGRAMS, EXPLODED VIEWS AND INTHE PARTS LIST ARE
CRITICAL TO SAFE OPERATION. REPLACE THESE COMPO-
NENTSWITH SONY PARTS WHOSE PART NUMBERS APPEAR
AS SHOWN IN THIS MANUAL OR IN SUPPLEMENTS PUB-
LISHED BY SONY.
ATTENTION AUX COMPOSANTS RELATIFS ÀLA
SÉCURITÉ!
LES COMPOSANTS IDENTIFÉS PAR UNE MARQUE !SUR LES
SCHÉMAS DE PRINCIPE, LES VUES EXPLOSÉES ET LES
LISTES DE PIECES
SONT D'UNE IMPORTANCE CRITIQUE POUR LA SÉCURITÉ DU
FONCTIONNEMENT. NE LES REMPLACER QUE PAR DES
COMPOSANTS SONY DONT LE NUMÉRO DE PIÉCE EST
INDIQUÉ DANS LE PRÉSENT MANUEL OU DANS LES
SUPPLÉMENTS PUBLIÉS PAR SONY.
Note:
Be sure to connect all wires (including FFC) in the MD
section before applying power or ICs may be damaged.
SECTION 1
SERVICING NOTES

– 7 –
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.
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 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” 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 2VAC range are suit-
able. (See Fig. A)
Fig. A. Using an AC voltmeter to check AC leakage.
1.5 k Ω 0.15 µ FAC
voltmeter
(0.75 V)
To Exposed Metal
Parts on Set
Earth Ground

– 8 –
HOW TO OPEN THE CD LID
1. Remove Side panel (L), (R). (Refer to page 12)
2. Rotate the Worm gear ass’y to direction of the arrow A.
LASER DIODE AND FOCUS SEARCH OPERATION
CHECK
1. Open the CD lid.
2. Turn on S104 and S916 as following figure.
3. Confirm that the laser diode emission while observing the ob-
jecting lens. When there is no emission, Auto Power Control
circuit or Optical Pick-up is broken.
Objective lens moves up and down once for the focus search.
CD lid
Worm gear ass’y
A
Insert a precision
screwdriver and
push S916.
S104: ON
MODEL IDENTIFICATION
— Bottom view —
Front Panel
PART No.
MODEL PART No.
AEP and UK models 4-212-516-0π
Singapore and Hong Kong models 4-212-516-1π
US and Canadian models 4-212-516-3π

– 9 –
!∞
SECTION 2
GENERAL
LOCATION OF CONTROLS
• Front view
1CD lid
26(CD) button
3Display window
4Remote sensor
5MD ^button and indicator
6MD pbutton
7VOLUME +/– buttons
86(MD) button
9CD pbutton
0CD ^button and indicator
!¡ 1/u button
!™ FUNCTION button
!£ TUNER/BAND button
!¢ PHONES jack
!∞ =0 button
!§ )+ button
!¶ MD disc slot
!• CD-MD SYNC button
!ª REC button and indicator
1TAPE OUT jacks
2TAPE IN jacks
3SPEAKER terminals
4VOLTAGE SELECTOR switch
(Singapore and Hong Kong models)
5FM ANTENNA terminal
6AM ANTENNA terminals
!¢
!£
!• !ª!¶!§
!™
!¡
!º
9
8
7
6
5
4
3
1(Upperpanel)
2(Upperpanel)
1 2
5
63
4
• Rear view

– 10 –
• REMOTE CONTROLLER
1FUNCTION button
2SLEEP button
3CD, OPEN/CLOSE button
41/u button
5MODE, PLAY/TUNING button
6REPEAT, STEREO/MONO button
7VOL +/– buttons
8DBFB button
9BAND, TUNER button
0–, PRESET button
!¡ +, PRESET button
!™ MD (button
!£ MD Pbutton
!¢ MD pbutton
!∞ MD =button
!§ MD +button
!¶ MD SCROLL button
!• CD (button
!ª CD Pbutton
@º CD pbutton
@¡ CD =button
@™ CD +button
@£ DISPLAY, CHARACTER button
@¢ EDIT button
@∞ – button
@§ + button
@¶ SELECT, CLOCK/TIMER button
@• N, CURSOR button
@ª n, CURSOR button
#º SET, CLOCK/TIMER button
#¡ YES, ENTER button
#™ NO, CANCEL button
#£ MUSIC MENU button
12 3 4
#º #¡ #™ #£
8
6
5
7
9 !º !¡
!™ !£ !¢
!∞ !§ !¶
!• !ª @º
@¶ @• @ª
@¢ @∞ @§
@¡ @™ @£

– 11 –
This section is extracted from
instruction manual.

– 12 –
PANEL, COVER
CD SECTION
Note: Follow the disassembly procedure in the numerical order given.
SECTION 3
DISASSEMBLY
1 two screws
(case 3 TP2)
1 two screws
(case 3 TP2)
1 two screws
(case 3 TP2
)
7 six screws
(BVTT 3
× 6)
1 two screws
(case 3 TP2)
5 two claws
6 rear cover
4 two claws
3 side panel (L)
3 side panel (R)
8 bottom cover
2 two screws
2 two screws
8 connector
(CN902)
4 CD section
2 two screws
(BVTP 3
× 8)
1 Open the CD lid.
6 Remove the reinfocement (L
)
to direction of arrow C – D .
5 Remove the reinfocement (R)
to direction of arrow
A – B .
3 two claws
2 three screws
(BVTP 3
× 8)
8 two connectors
(CN702, 707)
7 flat wire (19 core)
(CN102)
C
D
A
B

– 13 –
CD LID OPEN/CLOSE MOTOR
FRONT PANEL SECTION
3 CD lid open/close
motor
1 belt
2 two screws
(B 2.6
× 3)
1 connector
(CN104)
3 connector
(CN705)
4 front panel section
2 two screws
(BV/ring)

– 14 –
CD BASE UNIT
TUNER, MAIN BOARD
5 two screws
(PTPWHM 2.6)
5 two screws
(PTPWHM 2.6
)
1 two screws
(BVTP 2.6)
1 two screws
(BVTP 2.6)
2 Remove the CD base unit
section to direction of
the arrow
A .
6 CD base unit
3 screw
(PTT 2.6
× 5)
4 earth lug
A
3 flat wire (31 core)
(CN706)
3 flat wire (25 core)
(CN704)
3 flat wire (15 core)
(CN703)
4 two screws
(BVTP 3
× 8)
1 two screws
(BVTP 3
× 8)
5 Remove the MAIN board
to direction of the arrow
B .
2 Remove the tuner to
direction of the arrow
A .
B
A

– 15 –
POWER BOARD
MD MECHANISM DECK
2 screw
(BVTT 3
× 6
)
3 two screws
(BVTP 3
× 8)
1 connector
(CN501)
5 connector
(CN503)
1 connector
(CN501)
4 PC board holder
6 Remove the POWER board
to direction of the arrow
A .
A
2 two screws
(BVTT 3
× 6)
2 two screws
(BVTT 3
× 6)
4 two screws
(BVTT 2
× 3)
4 two screws
(BVTT 2
× 3)
1 two screws
(BVTP 3
× 8)
5 MD mechanism deck
3 Remove the MD mechanism
deck section to direction
of the arrow
A .
A

– 16 –
BD BOARD
SUB CHASSIS
1 flat wire (25 core)
(CN107)
1 flat wire (25 core
)
(CN106)
5 BD (MD) board
4 two claws
2 flexible board
(CN104)
2 flexible board
(CN101)
3 screw
(BVTT 2
× 4)
1 two step screws
2 insulator
1 two step screws
2 insulator
part
A
part A
part A
OK
NG
Take care so that the part
A
may be right position when installing.
3 sub chassis

– 17 –
1 stopper washer
2 shaft (shutter) A
shaft (shutter) A
shaft (shutter) B
3 shutter ass’y
shutter ass’y
hole B
hole A
When installing, install the shaft (shutter) A
into the hole as show in the figune before
installing the shaft (shutter) B into the hole B.
OVER WRITE HEAD
SHUTTER ASS’Y
1 screw (P 1.7 × 6)
2 over write head

– 18 –
SLIDER COMPLETE ASS’Y
NOTE FOR INSTALLATION
•SLIDER COMPLETE ASS’Y
claw
claw
4 Remove the slider complete ass’y
in the direction of arrow with putting
out of two claws.
1 special screw
(M 1.7
× 1.4)
2 retainer (gear)
3 Set the shaft of gear (LB) to be at the
position in the figure.
slider ass’y
Install the part A of lever (head up)
to pass over the slider complete ass’y.
part A
Take care no to damage
the detective switch.
OK
NG

– 19 –
Change-over of AM (MW)Tuner Step between 9 kHz and 10 kHz
• A step of AM (MW) channels can be changed over between 9 kHz and 10 kHz.
Procedure:
1. Press 1/ubutton to turn the set ON.
2. Select the function “TUNER”, and press [TUNER/BAND] button to select the BAND “AM (MW)”.
3. Press 1/ubutton to turn the set OFF.
4. Press [FUNCTION] and 1/ubuttons simultaneously, and the display of fluorescent indicator tube changes to “AM (MW) 9 kHz
STEP” or “AM (MW) 10 kHz STEP”, and thus the channel step is changed over.
Change-over of LW Tuner Step between 1 kHz and 3 kHz
• A step of LW channels can be changed over between 1 kHz and 3 kHz.
Procedure:
1. Press 1/ubutton to turn the set ON.
2. Select the function “TUNER”, and press [TUNER/BAND] button to select the BAND “LW”.
3. Press 1/ubutton to turn the set OFF.
4. Press [FUNCTION] and 1/ubuttons simultaneously, and the display of fluorescent indicator tube changes to “LW 1 kHz STEP” or
“LW 3 kHz STEP”, and thus the channel step is changed over.
ATT Change-over ofTAPE input
Procedure:
1. Press 1/ubutton to turn the set ON.
2. Select the function “TAPE”.
3. Press 1/ubutton to turn the set OFF.
4. Press 1/ubutton while pressing [FUNCTION] button. The power is turned on and the display of fluorescent indicator tube changes
to “Attenuator ON” or “Attenuator OFF”, then ATT change-over of TAPE input is completed.
CD tracking balance display
Procedure:
1. Press 1/ubutton to turn the set ON.
2. Select the function “CD”.
3. Press [TUNER/BAND] button while pressing p(CD) button.
4. The display of fluorescent indicator tube shows you the following message.
CD TR. BAL. ππ
LED and Fluorescent IndicatorTube All Lit, Key Check Mode
Procedure:
1. Press two buttons [VOLUME–] and [TUNER/BAND] simultaneously.
2. LEDs and fluorescent indicator tube are all turned on.
3. When the [FUNCTION] button is pressed, the fluorescent indicator tube lights up in the order of; partial lighting 1 npartial lighting
2 nall lit npartial lighting 1 n.
When the [VOLUME+/–] button is pressed, the LED lighting pattern changes.
To end without switching to the key check mode, press the 1/ubutton to turn off the power.
4. Press p(CD) button, and the key check mode is activated.
5. In the key check mode, the fluorescent indicator tube displays “KEY=0 JOG=0”. Each time a button is pressed, “KEY=” value
increases. However, once a button is pressed, it is no longer taken into account.
“JOG=” Value increases like 1, 2, 3 ... if press [VOLUME+] button, or it decreases like 99, 98, 97 ... if press [VOLUME–] button.
6. To exit from this mode, press order all buttons (13 buttons), and press any button, or disconnect the power cord.
SUB CLOCK CHECK
Procedure:
1. Connect an oscilloscope to IC707 pin (¡ and ground of the MAIN board.
2. Press two buttons [VOLUME–] and [REC] simultaneously, and the fluorescent indicator tube displays “32.768 kHz (91)”.
3. To check the signal on oscilloscope becomes 32 kHz square wave.
4. Press 1/ubutton to exit.
SECTION 4
SERVICE MODE

– 20 –
SECTION 5
TEST MODE
5-1. PRECAUTIONS FOR USE OF TEST MODE
Recording Laser Emission Mode
• Continuous recording mode (CREC MODE)
• Traverse adjustment mode (EFBAL ADJUST)
• Laser power adjustment mode (LDPWRADJUST)
• Laser power check mode (LDPWR CHECK)
• Traverse (MO) check (EF MO CHECK)
• Traverse (MO) adjustment (EF MO ADJUST)
5-2. SETTING THE TEST MODE
With the power off, press the =0 button while pressing the [VOLUME–] button.
5-3. EXITING THE TEST MODE
Press the p(MD) button while pressing the [FUNCTION] button. The STANDBY state will be set and the test mode will be cleared.
5-4. BASIC OPERATIONS OF THE TEST MODE
All operations are performed using the [VOLUME+/–] button, p(CD) button, and ^(CD) button.
The functions of these buttons are as follows.
Function name
VOLUME +/– button
p(CD) button
^(CD) button
Function
Changes parameters and modes
Proceeds onto the next step. Finalizes input.
Returns to previous step. Stops operations.