SECTION 5
ELECTRICAL 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
so that outputs match within 1 dB of peak.
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
within
parts adjust.
L-CH1dB
4. The adjustments should be performed with the rated power sup-peak
within
ply voltage unless otherwise noted.Output
1dB
5. The adjustments should be performed in the order given in thislevel
service manual. (As a general rule, playback circuit adjustment
should be completed before performing recording circuit ad-
R-CH
justment.)
peak
6. The adjustments should be performed for both L-CH and R-ScrewScrew
positionposition
CH.L-CHR-CH
peakpeak
7. Switches and controls should be set as follows unless otherwise
specified.
3. Mode: Playback
Y Test Tape
test tape
P-4-A100
TapeSignalUsed foroscilloscope
(10 kHz, �10 dB)
pin qs
P-4-A10010 kHz, �10 dBAzimuth AdjustmentL-CH
WS-48B3 kHz, 0 dBTape Speed Adjustmentpin 0
MAIN
L
P-4-L300315 Hz, 0 dBLevel AdjustmentboardVH
CN301B
R
set
Record/Playback Head Azimuth AdjustmentR-CH
pin qa
DECK A/B
waveform of oscilloscope
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
in phase 45° 90° 135° 180°
goodwrong
test tapemain board
P-4-A100CN301B
(10 kHz, �10 dB)Pin qs (L-CH)
4. After the adjustments, apply suitable locking compound to the
Pin qa (R-CH)level meter
pats adjusted.
set
+Adjustment Location: Playback Head (Deck A).
� Record/Playback/Erase Head (Deck B).
main board
CN301B
Pin 0 (GND)
21 |
ACEC
SONY
