18
HCD-GP7
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. Repeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Record/Playback/Erase Head.
[Rec Bias Adjustment]
Procedure:
In the common test mode, the “Tape test mode” is convenient for
this adjustment. In the “Tape test mode”, when the REC starts the
input signal FUNCTION is switched to MD automatically.
When the REC stops, the tape returns near to the recording start
position.
1. Press MD (VIDEO) button to select MD. (This step is not
necessary if the above test mode has already been set)
2. Insert a tape into deck B.
3. After press z REC PAUSE/START button, press z REC
PAUSE/START button, then recording start.
4. Mode: Record
5. Mode: Playback
6. Confirm the playback signal recorded in step 3 becomes
adjustable level as follows.
If these levels are not adjustable level, adjust the RV653 (L-CH)
and RV603 (R-CH) on the TC board to repeat steps 4 and 5.
Adjustable level: Playback output of 315 Hz to playback output
of 10 kHz: ±1.0 dB
Adjustment Location: TC board & MAIN board
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak
R-CH
peak
within
1dB
Screw
position
R-CH
peak
MAIN
board
CN302
set
test tape
P-4-A100
(10 kHz, –10 dB)
pin
6
oscilloscop
L-CH
R-CH
V
H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good
wrong
pin
2
pin
4
L
R
+
–
set
recorded
portion
MAIN board
CN302 Pin
2
(GND)
MAIN board
CN302
Pin
4
(L-CH)
Pin
6
(R-CH)
level mete
forward reverse
attenuator
set
MAIN board
MD (VIDEO)(J301)
1) 315 Hz
2) 10 kHz
50 mV (–23.8 dB)
600
Ω
blank tap
CN-123
AF OSC
w
w
w
.
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i
a
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y
u
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1
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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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