Sony HCD-GRX9000 User manual

MICROFILM
SERVICE MANUAL
MINI Hi-Fi COMPONENT SYSTEM
SPECIFICATIONS
HCD-GRX9000/RX900
Photo: HCD-RX900
Dolby noise reduction manufactured under license
from Dolby Laboratories Licensing Corporation.
“DOLBY” and the double-D symbol aare trade-
marks of Dolby Laboratories Licensing Corporation.
East European Model
CIS Model
HCD-RX900
E Model
HCD-GRX9000
Model Name Using Similar Mechanism HCD-H991AV
CD Mechanism Type CDM38LH-5BD29AL
Base Unit Type BU-5BD29AL
Optical Pick-up Type KSS-213D/Q-NP
Model Name Using Similar Mechanism HCD-GRX7/RX77S
Tape Transport Mechanism Type TCM-230AWR1/
230PWR1
HCD-GRX9000/RX900 are the Amplifier,
CD player, Tape Deck andTuner section
in MHC-GRX9000/RX900.
CD
Section
TAPE
DECK
Section
– Continued on next page –

– 2 –

– 3 –
1. SERVICING NOTES ............................................... 3
2. GENERAL
Location of Controls ....................................................... 6
Setting the Time .............................................................. 7
3. DISASSEMBLY ......................................................... 8
4. TEST MODE.............................................................. 11
5. MECHANICAL ADJUSTMENTS....................... 13
6. ELECTRICAL ADJUSTMENTS
DECK Section ................................................................. 13
TUNER Section .............................................................. 16
CD Section ...................................................................... 18
7. DIAGRAMS ................................................................. 20
7-1. Block Diagram – TUNER Section
(East European, CIS models only) – .............................. 21
7-2. Block Diagram – CD Section – ...................................... 23
7-3. Block Diagram – TAPE DECK Section – ...................... 25
7-4. Block Diagram – MAIN Section (1/2) – ........................ 27
7-5. Block Diagram – MAIN Section (2/2) – ........................ 29
7-6. Block Diagram – DISPLAY/KEY CONTROL/
POWER SUPPLY Section – ........................................... 31
7-7. Note for Printed Wiring Boards and
Schematic Diagrams ....................................................... 33
7-8. Printed Wiring Board – TUNER Section
(East European, CIS models only) – .............................. 34
7-9. Schematic Diagram – TUNER Section
(East European, CIS models only) – .............................. 35
7-10. Printed Wiring Board – CD Section – ........................... 37
7-11. Schematic Diagram – CD Section – ............................... 39
7-12. Printed Wiring Boards – CD MOTOR Section – .......... 41
7-13. Schematic Diagram – CD MOTOR Section – .............. 43
7-14. Printed Wiring Board – TAPE DECK Section – ........... 45
7-15. Schematic Diagram – TAPE DECK Section –.............. 47
7-16. Printed Wiring Board – LEAF SW Section – ...............49
7-17. Schematic Diagram – LEAF SW Section – .................. 49
7-18. Printed Wiring Board – MAIN Section – ...................... 51
7-19. Schematic Diagram – MAIN Section (1/4) –............... 53
7-20. Schematic Diagram – MAIN Section (2/4) –................ 55
7-21. Schematic Diagram – MAIN Section (3/4) –................ 57
7-22. Schematic Diagram – MAIN Section (4/4) –................ 59
7-23. Printed Wiring Board – PANEL Section – .................... 61
7-24. Schematic Diagram – PANEL Section – ....................... 63
7-25. Printed Wiring Board – CD-SW Section –.................... 65
7-26. Schematic Diagram – CD-SW Section – ...................... 65
7-27. Printed Wiring Board – HP Section – ........................... 67
7-28. Schematic Diagram – HP Section – .............................. 68
7-29. Printed Wiring Boards – POWER AMP Section – ....... 69
7-30. Schematic Diagram – POWER AMP Section – ............ 71
7-31. Printed Wiring Board
– TRANSFORMER Section – ........................................ 73
7-32. Schematic Diagram
– TRANSFORMER Section – ........................................ 74
7-33. IC Pin Function Description ........................................... 81
8. EXPLODED VIEWS ................................................ 86
9. ELECTRICAL PARTS LIST ............................... 95
TABLE OF CONTENTS
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.
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
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.
SECTION 1
SERVICING NOTES

– 4 –
SAFETY-RELATED COMPONENT WARNING!!
COMPONENTS IDENTIFIED BY MARK !OR DOTTED
LINE WITH MARK !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 PUB-
LISHED BY SONY.
PART No.
MODEL IDENTIFICATION
– Back Panel –
MODEL PART No.
E model 4-996-846-0π
Malaysia, Singapore models 4-996-846-1π
Saudi Arabia model 4-996-846-2π
East European, CIS models 4-996-846-5π

– 5 –
HOW TO OPEN THE DISC TRAY WHEN POWER SWITCH TURNS OFF.
NOTE FOR INSTALLATION (ROTARY ENCODER)
1 Remove the Case.
3 Pull-out the disc tray.
2 Turn the cam to the
direction of arrow.
BU cam
Groove Section A
Note:When attaching the Base unit, Insert th
e
section A into the groove of BU cam.
Note:When attaching the BU cam,
engage the Rotary encoder
switch as shown in the figure.

– 6 –
SECTION 2
GENERAL
LOCATION OF CONTROLS
1 2 3 4
!¶
!§
!∞
!ª
@º
@¡
@™
@£
5
6
7
8
9
!º
!¡
!™
!£
!¢
@¢
#º
#¡
#£
#¢
#¶
#•
#ª
@§
@¶
@•
@ª
$º $¡ $™ $£ $¢ $∞ $§
1I /u(Power) button
2DISC 1 to 3 buttons and indicators
3DISC SKIP/EX-CHANGE button
46(CD) button
5CD disc tray
6CD ^button and indicator
7TUNER, BAND button
8rREC button and indicator
9PPAUSE button and indicator
!º HI-DUB button
!¡ CD SYNC button
!™ EFFECT button and indicator
!£ SURROUND button
!¢ KARAOKE PON/MPX button
!∞ TAPE B 9and (buttons and indicators
!§ TAPE A 9and (buttons and indicators
!¶ FUNCTION button
!• MIC LEVEL knob
!ª MIX MIC jac
@º DISPLAY/DEMO button
@¡ CLOCK/TIMER SET button
@™ TIMER SELECT button
@£ pbutton
@¢ Fluorescent indicator tube
@∞ ENTER/NEXT button and indicator
@§ GROOVE button and indicator
@¶ VOLUME konb
@• PHONES jack
@ª DBFB button
#º Remote sensor
#¡ P FILE MEMORY button
#™ GEQ CONTROL button
#£ FILE SELECT button
#¢ LOOP button
#∞ NON-STOP button and indicator
#§ FLASH button
#¶ EDIT, DIRECTION button
#• PLAY MODE, DOLBY NR button
#ª REPEAT button
$º §button (deck A)
$¡ Tape deck A
$™ –, 0button and indicator
$£ JOG dial
$¢ +, )button and indicator
$∞ Tape deck B
$§ §button (deck B)
!•
@∞
#™
#§
#∞

– 7 –

– 8 –
Note: Follow the disassembly procedure in the numerical order given.
SECTION 3
DISASSEMBLY
FRONT PANEL SECTION
CASE
1 three screws
(BVTT3 × 8)
2 screw
(CASE3 TP2) (3 × 12)
3 two screws
(CASE3 TP2) (3 × 8)
6 case
2 screw
(CASE3 TP2) (3 × 12)
3 two screws
(CASE3 TP2) (3 × 8
)
4
4
5
3 two claws
4 loading panel
1 Turn the cam to the direction
of arrow
A .
A
9
screw
(BVTP3
× 10)
2 Pull-out the
disc tray.
0 three screws
(BVTT3
× 6)
8 connector
(CN109)
9 screw
(BVTP3
× 10)
6 wire (flat type) (13 core)
(23 cm) (CN201)
7 wire (flat type)
(17 core) (CN107)
5 wire (flat type)
(15 core) (33 cm)
(CN106)

– 9 –
TAPE MECHANISM DECK SECTION (TCM-230AWR1/TCM-230PWR1)
CD MECHANISM DECK SECTION (CDM38LH-5BD29AL)
1 Push the
cassette lids.
3 three screws
(BVTP3
× 8)
2 Open the
cassette lids.
4 two screws
(BVTP3
× 8 )
5 tape mechanism
deck section
(TCM-230AWR1/
TCM-230PWR1)
4 CD mechanism deck section
(CDM38LH-5BD29AL)
Note: The CD mechanism deck will
fall if two screws are removed.
Support it by hand, then remove
three screws.
3 two screws
(BVTP3
× 8)
2 wire (flat type) (19 core) (24 cm)
(CN105)
1 two connectors
(CN103, CN104)

– 10 –
MAIN BOARD
3 two screws
(BVTP3 × 8)
3 screw
(BVTP3 × 8)
2 wire (flat type) (13 core) (14 cm)
(CN102) (E, Thai)
wire (flat type) (15 core) (14 cm)
(CN102) (EXCEPT E, Thai)
6 MAIN boar
d
5 connector
(CN101)
7 connector
(CN110)
4 two screws
(BVTT3 × 6)
1 connector
(CN11)
3 screw
(BVTP3 × 8)

– 11 –
SECTION 4
TEST MODE
[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 three buttons p, [ENTER/NEXT], and I/usimulta-
neously.
2. The fluorescent indicator tube becomes blank instantaneously,
and the set is reset.
[CD Delivery Mode]
• This mode moves the pickup to the position durable to vibra-
tion. Use this mode when returning the set to the customer after
repair.
Procedure:
1. Press I/ubutton to turn the set ON.
2. Press [LOOP] button and I/ubutton simultaneously.
3. A message “LOCK” is displayed on the fluorescent indicator
tube, and the CD delivery mode is set.
[MC Hot Reset]
• This mode resets the set with the preset data kept stored in the
memory. The hot reset mode functions same as if the power
cord is plugged in and out.
Procedure:
1. Press three buttons p, [ENTER/NEXT], and [DISC1] si-
multaneously.
2. The fluorescent indicator tube becomes blank instantaneously,
and the set is reset.
[Sled Servo Mode]
• This mode can run the CD sled motor freely. Use this mode, for
instance, when cleaning the pickup.
Procedure:
1. Press I/ubutton to turn the set ON.
2. Select the function “CD”.
3. Press three buttons p, [ENTER/NEXT], and §simulta-
neously.
4. The Sled Servo mode is selected, if “CD” is blanking on the
fluorescent indicator tube.
5. With the CD in stop status, press )+ button to move the
pickup to outside track, or – 0button to inside track.
6. To exit from this mode, perform as follows:
1) Move the pickup to the most inside track.
2) Press three buttons in the same manner as step 3.
Note: • Always move the pickup to most inside track when exiting from
this mode. Otherwise, a disc will not be unloaded.
• Do not run the sled motor excessively, otherwise the gear can be
chipped.
[Change-over of FUNCTION Name]
• The FUNCTION name of external input terminal can be changed
over to “VIDEO” of “MD”.
Procedure:
1. Press I/ubutton to turn the set OFF.
2. Press I/ubutton together with [FUNCTION] button, and the
power is turned on, the display of fluorescent indicator tube
changes to “MD” of “VIDEO” instantaneously, and thus the
FUNCTION is changed over.
[Change-over of AM Tuner Step between 9 kHz and
10 kHz]
• A step ofAM channels can be changed over between 9 kHz and
10 kHz.
Procedure:
1. Press I/ubutton to turn the set ON.
2. Select the function “TUNER”, and press [TUNER/BAND]
button to select the BAND “AM”.
3. Press I/ubutton to turn the set OFF.
4. Press [ENTER/NEXT] and I/ubuttons simultaneously, and
the display of fluorescent indicator tube changes to “AM 9 k
STEP” or “AM 10 k 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 I/ubutton to turn the set ON.
2. Select the function “TUNER”, and press [TUNER/BAND]
button to select the BAND “LW”.
3. Press I/ubutton to turn the set OFF.
4. Press [ENTER/NEXT] and I/ubuttons simultaneously, and
the display of fluorescent indicator tube changes to “LW 1 k
STEP” or “LW 3 k STEP”, and thus the channel step is changed
over.
[LED and Fluorescent IndicatorTube All Lit, Key Check
Mode]
Procedure:
1. Press three buttons p, [ENTER/NEXT], and [DISC2] si-
multaneously.
2. LEDs and fluorescent indicator tube are all turned on.
Press [DISC2] button, and the key check mode is activated.
3. In the key check mode, the fluorescent indicator tube displays
“K 1 J0 V0”. Each time a button is pressed, “K” value in-
creases. However, once a button is pressed, it is no longer taken
into account.
“J” value increases like 1, 2, 3 ... if rotating [JOG] knob in “+”
direction, or it decreases like 0, 9, 8 ... if rotating in “–” direc-
tion.
“V” value increases like 1, 2, 3 ... if rotating [VOLUME] knob
in “+” direction, or it decreases like 0, 9, 8 ... if rotating in
“–” direction.
4. To exit from this mode, press three buttons in the same man-
ner as step 1, or disconnect the power cord.

– 12 –
[Aging Mode]
This mode can be used for operation check of CD section and tape
deck section.
• If an error occurred:
The aging operation stops and display status.
• If no error occurs:
The aging operation continues repeatedly.
1. Operating Method of Aging Mode
1) Set disc in DISC1 tray.
2) Load the tapes recording use into the decks A and B respec-
tively.
3) Press three buttons p, [ENTER/NEXT],
and [DISCSKIP/EX-CHANGE] simultaneously.
4) The aging mode is activated, if a CD roulette mark on the fluo-
rescent indicator tube is blinking.
5) To exit from the aging mode, press I/ubutton to turn the set
OFF.
2. Operation Sequence
• During the aging mode in the following sequence to below.
• Starting the CD section aging for function set “CD”, starting
the TAPE section (deckA) aging for function set “TAPE A” or
“TAPE B”. (Set another function is no work.)
CD (disc1) (12 minutes) →Deck A
↑↓(Maximum about
Deck B 12 minutes)
3. Aging mode in CD section
1) Display state
• No error occurs display
Note:
[*][*] : a letter “CD” and the remainder time (minute) alternately. (re-
mainder time start from 12 minute)
@@: track number in access.
• Error occurred
2) Operation during aging Mode
In the aging mode, the program is executed in the following se-
quence.
(1) The CD tray rotates and disc 1 is selected.
(2) Chucking is performed.
(3) TOC is read.
(4) Track 1 played back for 8 seconds.
(5) The CD tray opens and closes again.
(6) 1 to 5 is repeated.
(7) After 12 minutes of aging, aging is switched to the tape deck.



NO. Display Main factor
1 NO DISC ERR Not set disc in DISC1
2 FOCUS1 ERR Focus does not work
3 FOCUS2 ERR Focus does not work after the disc rotate as usual
4 GFS ERR GFS error
5 FBIAS ERR Error in to the focus bias adjustment
6 SENSOR ERR Disc sensor sens DISC1 is no disc
7 TABLE ERR CD tray lotate does not work
8 TRAY ERR Tray (include BD) move does not work
4. Aging mode in Tape Deck section
1) Display state
• No error occurs
Display action now
• Error occurred
Display action last time
2) Operation duringAging Mode
In the aging mode, the program is executed in the following se-
quence.
(1) The tape in deck A is rewound to the head.
(2) The FWD side is played back for 2 minutes.
(3) The tape is fast forwarded (FF) for 20 seconds. The follow-
ing procedure is performed when the tape end is reached
before the 20 seconds.
(4) The REV side is played back for 2 minutes.
(5) The tape is rewound to the head (REW).
(6) The tape in deck B is rewound to the head.
(7) The FWD side is played back for 2 minutes.
(8) The tape is fast forwarded (FF) for 20 seconds. The follow-
ing procedure is performed when the tape end is reached
before the 20 seconds.
(9) The REV side is played back for 2 minutes.
(10) The tape is rewound to the head (REW).
(11) Aging is switched to the CD player.
NO. Display action Action contents Final timing
1 TAPE AAG-1 Rewind the TAPE A The top of tape
2 TAPE AAG-2 FWD play the TAPE A 2 minutes playing
3 TAPE A AG-3 F.F. the TAPE A First either 20 seconds
or the end of tape
4 TAPE AAG-4 REV play the TAPE A 2 minutes playing
5 TAPE AAG-5 Rewind the TAPE A The top of tape
6 TAPE B AG-1 Rewind the TAPE B The top of tape
7 TAPE B AG-2 FWD play the TAPE B 2 minutes playing
8 TAPE B AG-3 F.F. the TAPE B First either 20 seconds
or the end of tape
9 TAPE B AG-4 REV play the TAPE B 2 minutes playing
10 TAPE B AG-5 Rewind the TAPE B The top of tape
[*][*] 1 – @ @

– 13 –
DECK SECTION 0 dB=0.775 V
SECTION 6
ELECTRICAL ADJUSTMENTS
Tape Signal Used for
P-4-A100 10 kHz, –10 dB Azimuth Adjustment
WS-48B 3 kHz, 0 dB Tape Speed Adjustment
P-4-L300 315 Hz, 0 dB Level Adjustment
DECK A DECK B
1. Demagnetize the record/playback head with a head demagne-
tizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in
this service manual. (As a general rule, playback circuit ad-
justment should be completed before performing recording
circuit adjustment.)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless other-
wise specified.
• Test Tape
Record/Playback Head Azimuth Adjustment
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback (FWD)
set
MAIN board
CN301
Pin
3 (L-CH)
Pin
1 (R-CH)
MAIN board
CN301
Pin
2 (GND)
+
–
level meter
test tape
P-4-A100
(10 kHz, –10 dB)
SECTION 5
MECHANICAL ADJUSTMENTS
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback heads pinch rollers
erase head rubber belts
capstan idlers
2. Demagnetize the record/playback head with a head demagne-
tizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
Mode Torque meter Meter reading
FWD CQ-102C 31 to 71 g • cm
(0.43 – 0.98 oz • inch)
FWD CQ-102C 2 to 6 g • cm
back tension (0.03 – 0.08 oz • inch)
REV CQ-102RC 31 to 71 g • cm
(0.43 – 0.98 oz • inch)
REV CQ-102RC 2 to 6 g • cm
back tension (0.03 – 0.08 oz • inch)
FF/REW CQ-201B 71 to 143 g • cm
(0.99 – 1.99 oz • inch)
FWD tension CQ-403A 100 g or more
(3.53 oz or more)
REV tension CQ-403R 100 g or more
(3.53 oz or more)

– 14 –
2. Turn the adjustment screw and check output peaks. If the peaks
do not match for L-CH and R-CH, turn the adjustment screw
so that outputs match within 1dB of peak.
3. Mode: Playback (FWD)
4. Repeat setps 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location:Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
Tape Speed Adjustment DECK B
Note: Start the Tape Speed adjustment as below after setting to the test
mode.
In the test mode, the tape speed is high during pressing the
[HI-DUB] button.
Procedure:
1. Turn the power switch on.
2. Press the pbutton,[ENTER/NEXT] button and [DISC3] button
simultaneously.
(The “VOLUME” on the fluorescent indicator tube will blink
while in the test mode.)
To exit from the test mode, press the I/ubutton.
Mode: Playback
1. Insert the WS-48B into the deck B.
2. Press the ·button on the deck B.
3. Press the [HI-DUB] button in playback mode.
Then at HIGH speed mode.
4. Adjust RV1001 on the LEAF SW board do that frequency
counter reads 6,000 ± 180 Hz.
5. Press the [HI-DUB] button.
Then back to NORMAL speed mode.
6. Adjust RV1002 on the LEAF SW board so that frequency
counter reads 3,000 ± 90 Hz.
Adjustment Location: LEAF SW board
Sample value of Wow and Flutter: 0.3% or less W.RMS (JIS)
(WS-48B)
Playback level Adjustment DECK A DECK B
Procedure:
Mode: Playback
Deck A is RV311 (L-CH) and RV411 (R-CH), Deck B is RV301
(L-CH) and RV401 (R-CH) so that adjustment within adjustment
level as follows.
Adjustment Level:
CN301 PB level: 301.5 to 338.3 mV (–8.2 to –7.2 dB) level
difference between the channels: within ± 0.5 dB
Adjustment Location: AUDIO board
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak R-CH
peak
within
1dB
Screw
position
R-CH
peak
set
test tape
P-4-A100
(10 kHz, –10 dB)
(pin
1 : R-CH)
oscilloscope
VH
waveform of oscilloscope
in phase 45 ° 90 ° 135 ° 180 °
good wrong
(pin 2 : GND)
(pin
3 : L-CH)
MAIN board
CN301
+
–
set
test tape
WS-48B
(3 kHz, 0 dB)
MAIN board
CN301 (Pin
3 : L-CH)
(
Pin 1 : R-CH
)
frequency counter
+
–
set
test tape
P-4-L300
(315 Hz, 0 dB)
MAIN board
CN301 (Pin
3 : L-CH)
(Pin
1 : R-CH)
level meter
forward reverse

– 15 –
REC Bias Adjustment DECK B
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This “REC memory mode” is convenient for performing this ad-
justment. During recording, the input signal FUNCTION will au-
tomatically switch to VIDEO.
(After recording, press the – 0button without stopping will
return to the position where recording was started.)
1. Press [FUNCTION] button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
3. After press [REC] button, press Pbutton, then recording
start.
4. Mode: Record
5. Mode: Playback
6. Confirm playback the signal recorded in step 3 become ad-
justable level as follows.
If these levels do not adjustable level, adjustment the RV341
(L-CH) and RV441 (R-CH) on the AUDIO board to repeat
steps 4 and 5.
Adjustable level: Playback output of 315 Hz to playback output
of 10 kHz: ± 1.0 dB
Adjustment Location: AUDIO board
REC Level Adjustment DECK B
Procedure:
INTRODUCTION
When set to the test mode performed in Tape Speed Adjustment,
when the tape is rewound after recording, the “REC memory mode”
which rewinds only the recorded portion and playback is set.
This “REC memory mode” is convenient for performing this ad-
justment. During recording, the input signal FUNCTION will au-
tomatically switch to VIDEO.
(After recording, press the – 0button without stopping will
return to the position where recording was started.)
1. Press [FUNCTION] button to select VIDEO. (This step is not
necessary if the above test mode has already been set.)
2. Insert a tape into deck B.
3. After press [REC] button, press Pbutton, then recording
start.
4. Mode: Record
5. Mode: Playback
6. Confirm playback the signal recorded in step 3 become ad-
justable level as follows.
If these levels do not adjustable level, adjustment the RV301
(L-CH) and RV351 (R-CH) on the MAIN board to repeat steps
4 and 5.
Adjustable level:
CN301 PB level: 47.2 to 53.0 mV (–24.3 to –23.3 dB)
Adjustment Location: MAIN board
Adjustment Location:
[MAIN BOARD] (Component Side)
[AUDIO BOARD] (Component Side)
[LEAF SW BOARD] (Component Side)
r
r
attenuator
set
MD/VIDEO (AUDIO) IN
1) 315 Hz
2) 10 kHz 50 mV (–23.8 dB)



600 Ω
blank tape
CN-123
AF OSC
+
–
++
––
+
–
set
recorded
portion
MAIN board
CN301 (Pin
3 : L-CH)
(Pin
1 : R-CH)
level meter
set
MD/VIDEO (AUDIO) IN
315 Hz, 50 mV (–23.8 dB) blank tape
CS-123
600
Ω
attenuator
AF OSC
+–
++
––
+
–
set
recorded
portion
MAIN board
CN301 (Pin
3 : L-CH)
(Pin
1 : R-CH)
level meter
REC LEVEL
13
RV301
L
RV351
R
CN106
CN301
CN107








RV401
RV301 RV341 RV311 RV411
IC602 CN601
LRRL
     
RV441
PB LEVEL
– DECK B –
REC BIAS
LR
  
PB LEVEL
– DECK A –
TAPE SPEED
RV1002 RV1001
(NORMAL) (HIGH)
CN1001
         

– 16 –
TUNER SECTION 0 dB=1 µV
(East European, CIS models only)
Note: As a front-end (FE1) is difficult to repair if faulty, replace it with
new one.
MW Section Adjustment
Note: FM Tuned Level Adjustment should be performed after this MW
Tuned Level Adjustment.
Setting:
MWTuned Level Adjustment
Band: MW
Procedure:
1. Set the output of SSG so that the input level of the set be-
comes 55 dB.
2. Tune the set to 1,050 kHz.
3. Adjust RV41 to the point (moment) when the TUNED indica-
tor will change from going off to going on.
Adjustment Location : TCB board
FM Section Adjustment
Note: This adjustment should be performed after the MW Tuned Level
Adjustment due to the same adjustment element.
Setting:
FMTuned Level Adjustment
Band: FM
Procedure:
1. Supply a 25 dBµ 98 MHz signal from the ANTENNA termi-
nal.
2. Tune the set to 98 MHz.
3. If the TUNED indicator does not light, adjust RV42 to the
point (moment) when the TUNED indicator will change from
going off to going on.
Adjustment Location: TCB board
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kHz, 75 kHz
deviation (100%) FM ANTENNA termina
l
(TM1) (75 Ω open)
75
Ω coaxial
set
FM RF stereo signal
generator
AM RF SSG
loop antenna
set
loop antenna
(Supplied accessories)
60 cm MW ANTENNA
terminal (TM1)
30% amplitude
modulation by
400 Hz signal
Field strength dB (
µ V/m) =SSG output level dB ( µ V/m) –26 dB.

– 17 –
FM Polar Adjustment
Connection 1:
Connection 2:
Adjustment Location :
[TCB BOARD] (Component Side)
Procedure :
1. Set the modulation of FM RF SSG to AUDIO 1 kHz, 10 kHz
deviation according to “Connection 1”.
2. Tune the set to 69 MHz.
3. Adjust the RV1702 so that the reading of frequency counter
connected to TP1702 becomes within 31.25 kHz ± 0.05 kHz.
(VCO Adjustment)
4. Then record the reading of the level meter connected toTP1701
5. Set the modulation of FM RF SSG to AUDIO 31.25 kHz, 10
kHz deviation according to “Connection 2”.
6. Tune the set to 69 MHz.
7. Set the CT1701 to be mechanical center.
8. Adjust the L1701 so that the reading of the level meter con-
nected to TP1701 become maximum.
Then adjust the CT1701 so that the reading of the level meter
connected to TP1701 becomes maximum. (SUB CARRIER
PEAK Adjustment)
9. Adjust the RV1701 so that the level at the moment becomes
14dB higher value than the level recorded in step 4. (SUB CAR-
RIER LEVEL Adjustment)
[TCB BOARD] (Conductor Side)
FM ANTENNA termina
l
(75 Ω )
75
Ω coaxial
set
FM RF SSG
Carrier frequency: 69 MHz
Output level : 1mV (60dB
µ ) (at 75 Ω open)
Modulation : AUDIO 1 kHz, 10kHz deviation
FM ANTENNA terminal
(75 Ω )
75 Ω coaxial
set
FM RF SSG
AF OSC
Audio 31.25 kHz external
modulation
terminal
Carrier frequency: 69 MHz
Output level : 1mV (60 dB µ ) (at 75 Ω open)
Modulation : AUDIO 31.25 kHz, 10 kHz deviation
(
EXTERNAL MODULATION
)
TM1
IFT41
IC41
CN1
RV42
FM Tuned Level
Adjustment
RV41
MW Tuned Level
Adjustment
L1701
Sub Carrier Pea
k
Adjustment
RV1701
Sub Carrier Level
Adjustment
CT1701
Sub Carrier Peak
Adjustment
RV1702
VCO Adjustment
frequency
counter
+
–
+
–
level meter
Q1701
Q1702
Q1703
TP1701
(FILTER)
TP1702
(VCO)

– 18 –
Note:
1. CD Block is basically designed to operate without adjustment. There-
fore, check each item in order given.
2. UseYEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10 MΩimpedance.
4. Clean the object lens by an applicator with neutral detergent when the
signal level is low than specified value with the following checks.
S Curve Check
Procedure:
1. Connect oscilloscope to test point TP (FEO).
2. Connect between test point TP (FOK) and GND by lead wire.
3. Turn Power switch on.
4. Put disc (YEDS-18) in and turned Power switch on again and
actuate the focus search. (Actuate the focus search when disc
table is moving in and out.)
5. Check the oscilloscope waveform (S-curve) is symmetrical
between A and B. And confirm peak to peak level within 3±1
Vp-p.
S-curve waveform
6. After check, remove the lead wire connected in step 2.
Note: • Try to measure several times to make sure than the ratio ofA : B
or B : A is more than 10 : 7.
• Take sweep time as long as possible and light up the brightness
to obtain best waveform.
RF Level Check
Procedure:
1. Connect oscilloscope to test point TP (RF) on BD board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF sig-
nal level is correct or not.
Note: Clear RF signal waveform means that the shape “≈” can be clearly
distinguished at the center of the waveform.
• FR signal
E-F Balance (Traverse) check
(Without remote commander)
Procedure:
1. Connect oscilloscope to test point TP (TEO) on BD board.
2. Turned Power switch on. Press [FUNCTION] button to select
CD.
3. Put disc (YEDS-18) in to play the number five track.
4. Press the pbutton, [ENTER/NEXT] button and ^but-
ton simultaneously several times to fluorescent indicator tube
display “SHUFFLE” is blink. (The sledding servo is turned
OFF.)
5. Check the level B of the oscilloscope’s waveform and the A
(DC voltage) of the center of the Traverse waveform.
Confirm the following:
Traverse waveform
6. Press the pbutton, [ENTER/NEXT] button and ^button
simultaneously several times to fluorescent indicator tube dis-
play “SHUFFLE” is OFF. (The sleding servo is turned ON.)
Confirm the C (DC voltage) is almost equal to theA (DC volt-
age) is step 5.
Traverse waveform
CD SECTION
A ×100 = less than ±7 (%)
B
A
B
symmetry
within 3
± 1 Vp-p
+
–
BD board
TP (RF)
TP (VC)
oscilloscope
VOLT/DIV: 200 m
V
TIME/DIV: 500 ns
level:
1.3
± 0.3 Vp-p
+
–
BD board
TP (FEO)
TP (VC)
oscilloscope
+
–
BD board
TP (TEO)
TP (VC)
oscilloscope
A (DC
voltage)
B
0 V
level: 500
± 100 mVp-p symmetry
Center of the waveform
C (DC
voltage
)
0 V
Sled servo ONSled servo OFF

– 19 –
Adjustment Location:
[BD BOARD] (Conductor Side)
IC103
CNU102
IC101 IC
I02
RF
FOK VC
FEO
TEO
GND
CNU101

– 20 –
SECTION 7
DIAGRAMS
• Circuit Boards Location
TRANSFORMER board
CD-SW board
PANEL board
HP board AMP (L) board
MAIN board
TCB board
(East European, CIS)
TUNER (FM / AM)
(E, Saudi Arabia, Singapore, Malaysia)
AMP (R) board
SENSOR board MOTOR (TURN) board
MOTOR (SLIDE) board
BD board
LEAF SW board
AUDIO board
CONNECTOR board