Mechanical Adjustments; Electrical Adjustments; Tape Section - Sony MDS-SE9 Service Manual

MDS-SE9
SECTION 5

MECHANICAL ADJUSTMENTS

PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab:
record/playback head pinch roller
erase head rubber belts
capstan
2. Demagnetize the record/playback head with a head demagne-
tizer.
(Do not bring the head demagnetizer close to the erase head.)
3. Do not use a magnetized screwdriver for the adjustments.
4. 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
REV CQ- 102RC
REV CQ-102RC
back tension
FF,REW CQ- 201B
FWD CQ-403A
tension
REV CQ-403R
tension
28
1.
2.
3.
4.
5.
6.
Meter Reading
2.94 to 7.74mN •m
(30 to 79g •cm)
0.20 to 0.59mN •m
(2 to 6g •cm)
2.94 to 7.74mN •m
(30 to 79g •cm)
Record/Playback Head Azimuth Adjustment
0.20 to 0.59mN •m
(2 to 6g •cm)
Procedure:
6.86 to 17.64mN •m 1.
(70 to 179g •cm)
9.80mN •m or more
(100g •cm or more)
9.80mN •m or more
(100g •cm or more)
2.
L-CH peak
screw position
SECTION 6

ELECTRICAL ADJUSTMENTS

TAPE SECTION

0 dB=0.775V
Demagnetize the record/playback head with a head demagne-
tizer.
Do not use a magnetized screwdriver for the adjustments.
The adjustments should be performed with the rated power
supply voltage unless otherwise noted.
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 ad-
justment.)
The adjustments should be performed for both L-CH and R-
CH.
Switches and controls should be set as follows unless other-
wise specified.
Tape Signal
P-4-A100 10 kHz, –10 dB
WS-48B 3 kHz, 0 dB
Mode : Playback
test tape
P-4-A100
MD/TAPE OUT (J401)
(10kHz, –10dB)
set
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 1 dB of peak.
output
within
level
1 dB
R-CH peak
L-CH peak
tape mechanism deck adjustment screw
Used for
Azimuth Adjustment
Tape Speed Adjustment
level meter
+
–
within 1dB
screw position
R-CH peak