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HCD-GT220/GT440/GT660
20
SECTION 6
ELECTRICAL ADJUSTMENTS
DECK SECTION
0 dB = 0.775V
1. Demagnetize the record/playback head with a head demagne-
tizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
3. After the adjustments, apply suitable locking compound to the
parts adjust.
TEST TAPE
Tape
Signal
Used for
P-4-A063
6.3 kHz, –10 dB
Azimuth Adjustment
RECORD/PLAYBACK HEAD AZIMUTH
ADJUSTMENT
ADJUSTMENT
Note: Perform this adjustment for both decks.
Procedure:
1. Mode:
1. Mode:
Playback
set
MIC board
PHONES jack
(J803)
PHONES jack
(J803)
+
–
–
level meter
test tape
P-4-A063
(6.3 kHz,
P-4-A063
(6.3 kHz,
−
10 dB)
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.
so that outputs match within 1dB of peak.
Screw
position
position
L-CH
peak
peak
within
1dB
1dB
Output
level
level
L-CH
peak
peak
R-CH
peak
peak
within
1dB
1dB
Screw
position
position
R-CH
peak
peak
3. Mode:
Playback
set
test tape
P-4-A063
(6.3 kHz,
P-4-A063
(6.3 kHz,
−
10 dB)
oscilloscope
V
H
waveform of oscilloscope
0°
+45°
−
45°
+90° +135° +180°
good
wrong
MIC board
PHONES jack
(J803)
PHONES jack
(J803)
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Playback Head (DECK-A)
Record/Playback/Erase
Record/Playback/Erase
Head
(DECK-B)
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