Sony HCD-GT22, Service Manual

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20
HCD-GT22/GT44/GT55
3. Mode: Playback
set
test tape
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)
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.
Screw
position
L-CH
peak
within
1dB
Output
level
L-CH
peak R-CH
peak
within
1dB
Screw
position
R-CH
peak
SECTION 6
ELECTRICAL ADJUSTMENTS
0 dB=0.775 V DECK SECTION
set
MIC board
PHONES jack
(J803)
+
–
level meter
test tape
P-4-A063
(6.3 kHz, –10 dB)
1. Demagnetize the record/playback head with a head
demagnetizer.
2. Do not use a magnetized screwdriver for the adjustments.
3. After the adjustments, apply suitable locking compound to the
parts adjust.
TEST TAPE
RECORD/PLAYBACK HEAD AZIMUTH ADJUSTMENT
Note:
Perform this adjustment for both decks.
Procedure:
1. Mode: Playback
Tape Signal Used for
P-4-A063 6.3 kHz, -10 dB Azimuth Adjustment
4. After the adjustments, apply suitable locking compound to
the pats adjusted.
Adjustment Location: Playback Head (DECK-A)
Record/Playback/Erase Head (DECK-B)