Mechanical Adjustments; Electrical Adjustments - Sony M-730V Service Manual

SECTION 3

MECHANICAL ADJUSTMENTS

PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
record/playback/erase head
rubber belts
2. Demagnetize the record/playback/erase head with a head de-
magnetizer. (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 sup-
ply voltage unless otherwise noted.
Power supply voltage : 3 Vdc
TAPE SPEED switch : 2.4cm
Torque Measurement
Mode Torque Meter
Forward CQ-102M
Reverse CQ-102MR
Fast Forward CQ-201M
Rewind CQ-201M
Tape Tension Measurement
Mode Tension Meter
Forward CQ-403M
Reverse CQ-403MR
pinch roller
capstan
Meter Reading
5 to 10 g • cm
(0.07 to 0.140 oz • inch)
5 to 10 g • cm
(0.07 to 0.140 oz • inch)
more than 30 g • cm
(more than 0.42 oz • inch)
more than 30 g • cm
(more than 0.42 oz • inch)
Meter Reading
more than 25 g
(more than 0.35 oz)
more than 25 g
(more than 0.35 oz)
– 8 –
SECTION 4

ELECTRICAL ADJUSTMENTS

Test Tape
Type Signal
S-2-A030A 3 kHz, – 20 dB Head Azimuth Adjustment
WS-24 3 kHz, – 10 dB Tape Speed Adjustment
Record/Playback/Erase Head Azimuth Adjustment
Setting:
VOL control : mechanical mid
TAPE SPEED switch : 2.4cm/s
VOR switch : OFF
FAST PB switch : OFF
Procedure:
1. Mode : Playback
test tape
S-2-A030A
(3 kHz, –20 dB)
set
2. Turn the adjustment screw to obtain the maximum reading on
level meter.
Note: Several peaks may appear, but the maximum.
Adjustment Location :
First remove the cover (AZ).
Remove the cover (AZ)
Tape Speed
Used for
(cm/s)
2.4
1.2/2.4
level meter
16 Ω
EAR jack (J101)
Head azimuth
adjustment screw
(FWD)
(REV)