Sony HCD-CP300, Руководство по обслуживанию, Страница: 15 / 56

15
HCD-CP300
SECTION 5
ELECTRICAL ADJUSTMENTS
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.
0 dB=0.775 V
DECK SECTION
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
demagnetizer.
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 adjustment
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 otherwise
specified.
• Test Tape
Record/Playback Head Azimuth Adjustment
Procedure:
1.
Mode: Playback
Tape Signal Used for
P-4-A63J 10 kHz, –10 dB Azimuth Adjustment
WS-48A 3 kHz, 0 dB Tape Speed Adjustment
P-4-L300 315 Hz, 0 dB Level Adjustment
set
MAIN board
SPEAKER terminals (SJ301)
L-CH, R-CH
+
–
level meter
test tape
P-4-A63J
(10 kHz, –10 dB)
Screw
position
L-CH
peak
within
1 dB
Output
level
L-CH
peak R-CH
peak
within
1 dB
Screw
position
R-CH
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:
set
test tape
P-4-A63J
(10 kHz, –10 dB)
R-CH
oscilloscope
L-CH
R-CH
V H
waveform of oscilloscope
in phase 45
°
90
°
135
°
180
°
good wrong
MAIN board
SPEAKER terminals (SJ301)
L-CH
Connect jig (extension cable J-2501-011-B)
to the MAIN board (CN304) and CD board (CN101).
MAIN board
CD board