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0 dB = 0.775 V
DECK SECTION
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 sup-
ply 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 ad-
justment.)
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-A100
10 kHz, –10 dB
WS-48B
3 kHz, 0 dB
P-4-L300
315 Hz, 0 dB
Record/Playback Head Azimuth Adjustment
DECK A/B
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
set
SECTION 5
ELECTRICAL ADJUSTMENTS
Used for
Azimuth Adjustment
Tape Speed Adjustment
Level Adjustment
main board
CN301B
Pin qs (L-CH)
Pin qa (R-CH)
level meter
+
–
main board
CN301B
Pin 0 (GND)
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 1 dB of peak.
within
L-CH
1dB
peak
Output
level
R-CH
peak
Screw
position
3. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
L-CH
MAIN
board
CN301B
set
R-CH
pin qa
waveform of oscilloscope
in phase 45°
good
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Playback Head (Deck A).
Record/Playback/Erase Head (Deck B).
within
1dB
Screw
position
L-CH
R-CH
peak
peak
oscilloscope
pin qs
pin 0
L
V
H
R
90° 135° 180°
wrong
21
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