Electrical Adjustments - Sony HCD-RV2 Service Manual

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3 7 63 1515 0

3. ELECTRICAL ADJUSTMENTS

DECK SECTION
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 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 adjust-
ment.)
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
P-4-A100 10 kHz, –10 dB
WS-48B
P-4-L300 315 Hz, 0 dB
Record/Playback Head Azimuth Adjustment
DECK A DECK B
Note: Perform this adjustments for both decks
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Procedure:
L 13942296513
1. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
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0 dB=0.775 V
Signal Used for
Azimuth Adjustment
3 kHz, 0 dB Tape Speed Adjustment
Level Adjustment
main board
IC201
Pin 5 (PB OUT(R))
Pin wh (PB OUT(L))
level meter
set
+
–
main board
IC201
Pin eh (GND)
x ao
y
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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.
L-CH
peak
R-CH
peak
Screw
position
3. Mode: Playback
test tape
P-4-A100
(10 kHz, –10 dB)
Q Q
3 6 7 1 3
4. After the adjustments, apply suitable locking compound to the
pats adjusted.
Adjustment Location: Playback Head (Deck A).
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.
HCD-RV2/RV5/RV6
2 9 9 4 2 8
within
1dB
Output
level
L-CH R-CH
peak peak
oscilloscope
pin wh
L-CH
pin eh
MAIN
L
board
IC201
R
set
R-CH
pin 5
waveform of oscilloscope
1 5 0 5 8 2 9 9 4
in phase 45 ° 90 ° 135 ° 180 °
good wrong
Record/Playback/Erase Head (Deck B).
m
co
reverse
forward
9 9
within
1dB
Screw
position
V H
2 8 9 9
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