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 1dB of peak.
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
within
parts adjust.
L-CH1dB
4. The adjustments should be performed with the rated powerpeak
within
supply 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
R-CH
adjustment.)
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 3
P-4-A10010 kHz, �10 dBAzimuth AdjustmentL-CH
WS-48B3 kHz, 0 dBTape Speed Adjustmentpin 2
MAIN
L
P-4-L300315 Hz, 0 dBLevel AdjustmentboardVH
CN301
R
set
Record/Playback Head Azimuth AdjustmentR-CH
pin 1
DECK A DECK B
waveform of oscilloscope
Note: Perform this adjustments for both decks
Procedure:
1. Mode: Playback
in phase45° 90° 135° 180°
goodwrong
test tapemain board
P-4-A100CN301
(10 kHz, �10 dB) Pin 3 (L-CH)
4. After the adjustments, apply suitable locking compound to the
Pin 1 (R-CH)level meter
pats adjusted.
set
+Adjustment Location:Playback Head (Deck A).
� Record/Playback/Erase Head (Deck B).
main board
CN301
Pin 2 (GND)
N 21 N |
ACEC
SONY
