Sony HCD-RG88 Service Manual page 19

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.
within
L-CH
1dB
peak
Output
level
R-CH
peak
Screw
position
L-CH
peak
3. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
pin 1
L-CH
MAIN
L
board
CN301
R
set
R-CH
pin 3
waveform of oscilloscope
in phase 45 °
good
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
forward
within
1dB
Screw
position
R-CH
peak
oscilloscope
pin 2
V H
90 ° 135 ° 180 °
wrong
reverse
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 button to turn the set ON.
?/1
[ENTER]
2. Press three buttons ,
x
To release from the test mode, press the
Mode: Playback
MAIN board
test tape
CN301
WS-48B
(3 kHz, 0 dB) Pin 1 (L-CH)
Pin 3 (R-CH)
set
MAIN board
CN301 Pin 2 (GND)
1. Insert the WS-48B into the deck B.
2. Press the hH button on the deck B.
[CD SYNC HI-DUB]
3. Press the
Then at HIGH speed mode.
4. Adjust RV1001 on the SW board so that frequency counter reads
6,000 ± 180 Hz.
[CD SYNC HI-DUB]
5. Press the
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)
HCD-RG88
[DISC 3]
and simultaneously.
button.
?/1
frequency counter
+
–
button in playback mode.
button.
(WS-48B)
19