HCD-G1 is the tuner, deck, CD and
amplifier section in LBT-G1/G1S.
Model Name Using Similar MechanismNEW
CD
SECTION
TAPE
DECK
SECTION
CD Mechanism TypeCX3
Base Unit TypeKSM-213BCM
Optical Pick-up TypeKSS-213B/S-N
Model Name Using Similar MechanismHCD-H100
Tape Transport
Mechanism Type
DECK-A
DECK-B
AEP Model
UK Model
E Model
TK20FX-SW943-800
TK20FX-SW943-800
SPECIFICATIONS
COMPACT DISC DECK RECEIVER
— Continued on next page —
MICROFILM
— 1 —
CAUTION
Use of controls or adjustments or performance of procedures
other than those specified herein may result in hazardous radiation exposure.
Notes on chip component replacement
• Never reuse a disconnected chip component.
• Notice that the minus side of a tantalum capacitor may be
damaged by heat.
Flexible Circuit Board Repairing
• Keep the temperature of soldering iron around 270˚C
during repairing.
• Do not touch the soldering iron on the same conductor of the
circuit board (within 3 times).
• Be careful not to apply force on the conductor when soldering
or unsoldering.
Laser component in this product is capable of emitting radiation
exceeding the limit for Class 1.
This appliance is classified as
a CLASS 1 LASER product.
The CLASS 1 LASER PRODUCT MARKING is located on
the rear exterior.
This caution
label is located
inside the unit.
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 PUBLISHED BY SONY.
— 2 —
SERVICING NOTE
TABLE OF CONTENTS
NOTES ON HANDLING THE OPTICAL PICK-UP BLOCK
OR BASE UNIT
The laser diode in the optical pick-up block may suffer electrostatic
break-down because of the potential difference generated by the
charged electrostatic load, etc. on clothing and the human body.
During repair, pay attention to electrostatic break-down and also
use the procedure in the printed matter which is included in the
repair parts.
The flexible board is easily damaged and should be handled with
care.
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 pickup block. Therefore, when checking the laser diode emission, observe from more than 30 cm away from the objective lens.
MODEL IDENTIFICATION
— AC POWER SUPPLY CODE —
AEP model
UK model
Mexican model (Without voltage selector)
E, Argentine model (With voltage selector)
• Abbreviation
AR : Argentine model
MX : Mexican model
2. Demagnetize the record/playback head with a head demagnetizer.
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
Torque
FWD
FWD
back tension
FF/REW
Torque meterMeter reading
CQ-102C
CQ-102C
CQ-201B
40 to 70 g • cm
(0.56 - 0.97 oz • inch)
1 to 5 g • cm
(0.01 - 0.07 oz • inch)
55 to 140 g • cm
(0.76 - 1.94 oz • inch)
DECK SECTION0 dB=0.775V
1. Demagnetize the record/playback head with a head damagnetizer .
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjusted.
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 adjustment
should be completed before performing recording circuit
adjustment.)
6. The adjustments should be performed for both L-CH and RCH.
Tape
P-4-A100
WS-48B
Record/Playback Head Azimuth Adjustment
(Deck A, Deck B)
Note: Perform this adjustments for both decks.
Procedure:
1. Mode : Playback
test tape
P-4-A100
(10kHz, –10dB)
Signal
10 kHz, –10 dB
3 kHz, 0 dB
SPEAKER
terminal
Used for
Azimuth Adjustment
Tape Speed Adjustment
level meter
set
+
–
— 9 —
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 2 dB of peak.
L-CH
peak
screw
position
R-CH
peak
output
level
within
2dB
L-CH
peak
R-CH
peak
within 2dB
screw
position
3. Mode: Playback
Tape Speed Adjustment (Deck A)
Procedure:
1. Mode: Playback
test tape
WS-48B
(3kHz, 0dB)
set
SPEAKER
terminal
frequency counter
+
–
2. Adjust the SFR201 so that the frequency counter reads 3,000
Hz ± 90 Hz.
Adjustment Location
[MAIN BOARD] — Component side —
test tape
P-4-A100
(10kHz, –10dB)
in phase
SPEAKER
terminal
(L-CH)
L
set
R
SPEAKER
terminal
(R-CH)
Waveform of oscilloscope
45˚
good
90˚
oscilloscope
135˚180˚
wrong
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
Adjustment Location:
CN205
CN301
SFR201
Tape Speed
Sample Value of Wow and flutter
W. RMS (JIS) within 0.3%
(test tape: WS-48B)
Adjustment screws
REC/PB head (deck A)
or PB head (deck B)
— 10 —
TUNER SECTION0 dB=1µV
Note:As a FM front end (U1) is difficult to repair if faulty, replace
it with new one. (AEP, UK models)
AM T uning Volta ge Adjustment
DC voltmeter
Tuner board
TP2
(VT)
Procedure:
1. Set the reception frequency of the unit to 530 kHz (10 kHz step)
or 531 kHz (9 kHz step).
2. Adjust L105 for 1.2 ± 0.05 V reading on the DC voltmeter.
3. Set the reception frequency of the unit to 1,710 kHz (10 kHz
step) or 1602 kHz (9 kHz step).
4. Confirm that the voltage reading on the DC voltmeter is within
8.0 ± 0.5 V.
Adjustment Location: TUNER board
AM T racking Adjustment
+
–
loop antenna
loop antenna
(Supplied accessories)
AM RF SSG
30% amplitude
modulation by
400Hz signal
60cm
Field strength dB (µV/m) = SSG output level dB (µV/m) –26dB.
Procedure:
1. Tune the set to 600 kHz (10 kHz step) or 603 kHz (9 kHz step).
2. Set the output of AM RF SSG so that the input level of the set
will become 60 dB (µV/m).
3. Adjust L104 so that when the waveform on the oscilloscope is
maximum, no noise appears.
4. Tune the set to 1,400 kHz (10 kHz step) or 1404 kHz (9 kHz
step).
FM T uning Voltage Adjustment
(EXCEPT AEP, UK models)
DC voltmeter
Tuner board
TP2
(VT)
+
–
set
AM antenna
terminal (JK101)
5. Adjust TC102 so that when the waveform on the oscilloscope is
maximum, no noise appears.
• Repeat the procedures in each adjustment several times, and the
tracking adjustment should be finally done by the trimmer
capacitors.
Adjustment Location: TUNER board
Procedure :
1. Set the reception frequency of the unit to 87.5 MHz.
2. Adjust L103 for 1.2 ± 0.05V reading on the DC voltmeter.
3. Set the reception frequency of the unit to 108 MHz.
4. Confirm that the voltage reading on the DC voltmeter is within
7.8 ± 0.5V.
Adjustment Location: TUNER board
— 11 —
FM T racking Adjustment
(EXCEPT AEP, UK models)
FM RF SSG
oscilloscope
FM Tuned Level Adjustment
FM RF SSG
75
Ω
coaxial
set
Ω
open)
SPEAKER terminal
FM ANTENNA terminal (JK101)
Carrier frequency : 90 MHz, 106 MHz
Modulation: AUDIO 1kHz, 75kHz deviation (100%)
Output level: 20 dB (at 75
+
–
Procedure:
1. Tune the set to 90 MHz.
2. Adjust L102 so that when the waveform on the oscilloscope is
maximum, no noise appears.
3. Tune the set to 106 MHz.
4. Adjust TC101 so that when the waveform on the oscilloscope is
maximum, no noise appears.
• Repeat the procedures in each adjustment several times, and the
tracking adjustment should be finally done by the trimmer
capacitors.
1. Supply a 28 dB 98 MHz signal from the ANTENNA terminal.
2. Tune the set to 98 MHz.
3. Adjust SFR101 to the point (moment) when the TUNED indicator will change from going off to going on.
Adjustment Location: TUNER board
EXCEPT AEP, UK models
[TUNER BOARD] — Component side —
FM T uning V oltage
JK101
TP2 (VT)
L104
TC102
L103
TC101
L102
L105
AM T racking
FM T racking
AM T uning Voltage
FM T uned Level
SFR101
CN101
AEP, UK models
[TUNER BOARD] — Component side —
FM T uned Level
JK101
L104
U1
TP2 (VT)
AM T rac king
TC102
L105
AM T uning Voltage
SFR101
T101
— 12 —
CD SECTION
Note:
1. CD Block is basically constructed to operate without adjustment.
Therefore, check each item in order given.
2. Use YEDS-18 disc (3-702-101-01) unless otherwise indicated.
3. Use an oscilloscope with more than 10MΩ impedance.
4. Clean the object lens by an applicator with neutral detergent
when the signal level is low than specified value with the following checks.
5. Adjust the focus bias adjustment when optical block is replaced.
Focus Bias Adjustment
CD DECODER
board
CN12
FEO
VC
Procedure:
1. Connect DC voltmeter to test point CN12 (FEO), (VC) on CD
DECODER board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and stop.
4. Adjust VR01 so that the DC voitmeter reading is 0 ± 20 mV.
Adjustment Location: CD DECODER board
DC voltmeter
+
–
RF Level Check
CD DECODER
board
TP (RF)
CN12 (VC)
Procedure :
1. Connect oscilloscope to test point TP (RF) on CD DECODER
board.
2. Turned Power switch on.
3. Put disc (YEDS-18) in and playback.
4. Confirm that oscilloscope waveform is clear and check RF signal level is correct or not.
Note: Clear RF signal waveform means that the shape “◊” can be
clearly distinguished at the center of the waveform.
oscilloscope
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
+0.3
level: 1.0 Vp-p
–0.2
Adjustment Location: CD DECODER board
5-1. CIRCUIT BOARDS LOCATION
DISC LED board
PANEL board
SENSOR board
R/P SWITCH board
MAIN Board
SECTION 5
DIAGRAMS
O/C board
TUNER board
AC SUPPLY board
(E, Argentine, Mexican)
AC POWER SUPPLY board (AEP, UK)
VOL SELECT board (E, Argentine)
Focus Gain Adjustment (VR02)
This gain has a margin, so even if it is slightly off.
There is no problem.
Therfore, do not perform this adjusment.
Please note that it should be fixed to mechanical center position
when you moved and do not know original position.