Sony HCD-GRX50 Service Manual page 15

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
3. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
L-CH
MAIN
board
CN301
set
R-CH
R-CH
waveform of oscilloscope
in phase 45
good
4. Repeat step 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).
forward
reverse
within
1dB
Screw
position
L-CH
R-CH
peak peak
main board
MD OUT jack (J101)
L-CH
oscilloscope
H
V
90 135 180
wrong
Tape Speed Adjustment
Mode: Playback
test tape
WS-48B
(3 kHz, 0 dB)
set
1. Insert the WS-48B into the deck B.
2. Press the ( button on the deck B.
[HI-DUB]
3. Press the
Then at HIGH speed mode.
4. Adjust RV1001 on the LEAF SW board do that frequency
counter reads 6,000 ± 180 Hz.
[HI-DUB]
5. Press the
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)
Playback level Adjustment
Procedure:
Mode: Playback
test tape
P-4-L300
(315 Hz, 0 dB)
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:
J101 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
– 15 –
DECK B
frequency counter
+
–
main board
MD OUT jack (J101)
L-CH, R-CH
button in playback mode.
button.
(WS-48B)
DECK A DECK B
level meter
+
set
–
main board
MD OUT jack (J101)
L-CH, R-CH