SECTION 4
ELECTRICAL CONFIRMATIONS AND ADJUSTMENTS
2. Turn the adjustment screw and check output peaks. If the peaks
DECK SECTION0 dB=0.775 V
do not match for L-CH and R-CH, turn the adjustment screw
Note:Confirm each contents of this section first of all. If the results areso that outputs match within 1dB of peak.
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.within
3. After the adjustments, apply suitable locking compound to theL-CH1dB
peak
parts adjust.within
Output
4. The adjustments should be performed with the rated power1dB
level
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-R-CH
justment should be completed before performing recordingpeak
ScrewScrew
circuit adjustment)positionL-CHR-CHposition
6. The adjustments should be performed for both L-CH and R-peakpeak
CH.
7. Switches and controls should be set as follo3.ws unless otherMode: Playback-
wise specified.MAIN board
test tapeLINE OUT jack (PJ301)
P-4-A100L-CH
Y Test Tape(10 kHz, �10 dB)oscilloscope
TapeSignalUsed forL-CH
P-4-A10010 kHz, �10 dBAzimuth Adjustment
P-4-L300315 Hz, 0 dBLevel AdjustmentVH
set
Record/Playback Head Azimuth Adjustment
R-CH
Procedure:
R-CH
1. Mode: Playback
test tapeMAIN boardwaveform of oscilloscope
P-4-A100LINE OUT jack (PJ301)
(10 kHz, �10 dB) L-CH, R-CH
level meterin phase45° 90° 135° 180°
goodwrong
set
+
�
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
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ACEC
