Electrical Adjustments - Sony CMT-CP300 Service Manual

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
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
Tape Signal
P-4-A63J 10 kHz, –10 dB
WS-48A 3 kHz, 0 dB
P-4-L300 315 Hz, 0 dB
Record/Playback Head Azimuth Adjustment
Procedure:
1. Mode: Playback
test tape
MAIN board
P-4-A63J
SPEAKER terminals (SJ301)
(10 kHz, –10 dB)
L-CH, R-CH
set
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
1 dB
peak
Output
level
R-CH
peak
Screw
position
SECTION 5

ELECTRICAL ADJUSTMENTS

Used for
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
level meter
+
–
within
1 dB
Screw
position
L-CH
R-CH
peak peak
3. Mode: Playback
MAIN board
SPEAKER terminals (SJ301)
test tape
L-CH
P-4-A63J
(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:
MAIN board
Connect jig (extension cable J-2501-011-B)
to the MAIN board (CN304) and CD board (CN101).
HCD-CP300
oscilloscope
H
V
90 ° 135 ° 180 °
wrong
CD board
15