Electrical Confirmations And Adjustments; Deck Section - Sony HCD-VP1 Service Manual

ELECTRICAL CONFIRMATIONS AND ADJUSTMENTS

DECK SECTION

0 dB=0.775 V
Note: Confirm each contents of this section first of all. If the results are
not satisfied, do the adjustment.
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
parts adjust.
4. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
5. The adjustments should be performed in the order given in
this service manual. (As a general rule, playback circuit ad-
justment should be completed before performing recording
circuit adjustment)
6. The adjustments should be performed for both L-CH and R-
CH.
7. Switches and controls should be set as follows unless other-
wise specified.
• Test Tape
Tape Signal
P-4-A100 10 kHz, –10 dB
P-4-L300 315 Hz, 0 dB
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
set
SECTION 4
Used for
Azimuth Adjustment
Level Adjustment
MAIN board
LINE OUT jack (PJ301)
L-CH, R-CH
level meter
+
–
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.
within
L-CH
1dB
peak
Output
level
R-CH
peak
Screw
position
3. Mode: Playback
MAIN board
LINE OUT jack (PJ301)
test tape
L-CH
P-4-A100
(10 kHz, –10 dB)
L-CH
set
R-CH
R-CH
waveform of oscilloscope
in phase 45 °
good
4. Repeat step 1 to 3 in playback (REV) mode.
5. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location:
reverse
forward
within
1dB
Screw
position
L-CH R-CH
peak peak
oscilloscope
V H
90 ° 135 ° 180 °
wrong
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