HCD-GX8000, HCD-RG77 - Sony Audio Service Manual (repair manual). Page 19

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19
HCD-GX8000/RG77
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
4. 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
[CD SYNC HI-DUB] 
button.

Procedure:
1. Press
?/1
button to turn the set ON.
2. Press three buttons
x
, 
[ENTER]
 and 
[DISC 3]
 simultaneously.
To release from the test mode, press the
?/1
button.
Mode:  Playback
1. Insert the WS-48B into the deck B.
2. Press the hH button on the deck B.
3. Press the 
[CD SYNC HI-DUB]
 button in playback mode.
Then at HIGH speed mode.
4. Adjust RV1001 on the SW board so that frequency counter reads
6,000 
±
 180 Hz.
5. Press the 
[CD SYNC HI-DUB]
 button.
Then back to NORMAL speed mode.
6. Adjust RV1002 on the SW board so that frequency counter reads
3,000 
±
 90 Hz.

Adjustment Location: SW board

Sample Value of Wow and Flutter: 0.3% or less W. RMS (JIS)
(WS-48B)
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
MAIN
board
CN301
set
test tape
P-4-A100
(10 kHz, –10 dB)
pin 
3
oscilloscope
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
pin 
2
pin 
1
L
R
+
–
set
test tape
WS-48B 
(3 kHz, 0 dB)
MAIN board
CN301 Pin 
2
 (GND)
MAIN board
CN301
Pin 
1
 (L-CH)
Pin 
3
 (R-CH)
frequency counter
forward
reverse

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