20
HCD-GN77D
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
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
control inside motor
Tape Speed Adjustment
DECK B
Procedure:
Mode: Playback
w
w
w
.
x
i
a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
http://www.xiaoyu163.com
http://www.xiaoyu163.com
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