Sony HCD-GN88D - Tape Speed Adjustment (Deck B)

20
HCD-GN88D
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).
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
oscilloscop
e
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45 ° 90 ° 135 ° 180 °
good
wrong
pin 2
pin 1
L
R
forward
reverse
set
MAIN board
AUDIO OUT jack (J730)
L-CH, R-CH
+
–
frequency counter
test tape
WS-48B
(3 kHz, 0 dB)
1. Insert the WS-48B into the deck B.
2. Press the H button on the deck B.
3. Adjust the tape speed adjustment control inside motor so that
frequency counter reads 3,000 ± 90Hz.
Sample value of wow and flutter W.RMS (JIS) less than 0.3%
WS-48B
Adjustment Location:
Tape speed Adjustment
Tape speed adjustmen
t
control inside motor
Tape Speed Adjustment
DECK B
Procedure:
Mode: Playback