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QQ
3 7 63 1515 0
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.
L-CH
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
TE
L 13942296513
in phase 45 °
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Playback Head (Deck A).
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.
forward
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within
1dB
within
1dB
Screw
position
L-CH
R-CH
peak
peak
oscilloscope
pin 1
pin 2
L
V
H
R
pin 3
waveform of oscilloscope
90 ° 135 ° 180 °
wrong
good
Record/Playback/Erase Head (Deck B).
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ao
u163
y
i
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2 9
8
REC BIAS ADJUSTMENT DECK B
Procedure:
In the MC test mode, the "REC memory mode" is convenient for
this adjustment. In the "REC memory mode" , when the REC starts
the input signal FUNCTION is switched to VIDEO automatically.
When the REC stops, the tape returns near to the recording start
position.
1. Press
MD (VIDEO)
necessary if the above test mode has already been set)
2. Insert a tape into deck B.
[REC PAUSE/START]
3. After press
START]
button, then recording start.
4. Mode: Record
MAIN board
MD/VIDEO (AUDIO) IN (J750)
1) 315 Hz
2) 10 kHz
AF OSC
attenuator
5. Mode: Playback
Q Q
3
6 7
1 3
recorded
1 5
portion
6. Confirm the playback signal recorded in step 3 becomes
adjustable level as follows.
If these levels are not adjustable level, adjust the RV304 (L-
CH) and RV354 (R-CH) on the MAIN board to repeat steps 4
and 5.
Adjustable level: Playback output of 315 Hz to playback output
Adjustment Location: MAIN board
co
.
HCD-GN700/GX8800
9 4
2 8
button to select VIDEO. (This step is not
button, press
50 mV (–23.8 dB)
600 Ω
set
MAIN board
CN301
0 5
8
2 9
9 4
2 8
level meter
Pin 1 (L-CH)
Pin 3 (R-CH)
+
set
–
MAIN board
CN301 Pin 2 (GND)
of 10 kHz: ±1.0 dB
m
9 9
[REC PAUSE/
blank tape
CN-123
9 9
21
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