Mechanical Adjustments; Electrical Adjustments - Sony hcd-grx40av Service Manual

SECTION 5
QQ

MECHANICAL ADJUSTMENTS

3 7 63 1515 0
Precaution
1. Clean the following parts with a denatured alcohol-moistened
swab:
record/playback head
erase head
capstan
2. Demagnetize the record/playback head with a head
demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. After the adjustments, apply suitable locking compound to the
parts adjusted.
5. The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
Torque Measurement
Torque Torque meter
FWD CQ-102C
FWD
CQ-102C
back tension
FF/REW CQ-201B
TE
L 13942296513
www
.
14
http://www.xiaoyu163.com
pinch rollers
rubber belts
idlers
Meter reading
40 to 70 g • cm
(0.56 - 0.97 oz • inch)
1 to 5 g • cm
(0.01 - 0.07 oz • inch)
55 to 140 g • cm
(0.76 - 1.94 oz • inch)
x ao
y
i
http://www.xiaoyu163.com
SECTION 6

ELECTRICAL ADJUSTMENTS

8
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 adjusted.
4. The adjustments should be performed with the rated power
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 adjustment
should be completed before performing recording circuit
adjustment.)
6. The adjustments should be performed for both L-CH and R-
CH.
Tape
10 kHz, –10 dB
P-4-A100
WS-48B
Record/Playback Head Azimuth Adjustment
(Deck A, Deck B)
Note: Perform this adjustments for both decks.
Procedure:
1. Mode : Playback
test tape
P-4-A100
(10kHz, –10dB)
Q Q
3 6 7 1 3
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 2 dB of peak.
L-CH
output
peak
level
R-CH
peak
screw
position
u163
.
2 9 9 4 2 8
0 dB=0.775V
Signal Used for
Azimuth Adjustment
Tape Speed Adjustment
3 kHz, 0 dB
level meter
1 5 0 5 8 2 9 9 4
SPEAKER
terminal (JK401)
set
within
2dB
L-CH
R-CH
peak
peak
m
co
9 9
2 8 9 9
within 2dB
screw
position