Mechanical Adjustment; Electrical Adjustment - Sony TCM-16 Service Manual

SECTION 3

MECHANICAL ADJUSTMENT

PRECAUTION
1. Clean the following parts with a denatured-alcohol-moistened
swab :
playback head
capstan
2. Demagnetize the playback head with a head demagnetizer.
3. Do not use a magnetized screwdriver for the adjustments.
4. The adjustments should be performed with the rated power
supply voltage (DC 3.0 V) unless otherwise noted.
Torque Measurement
Mode Torque Meter
FWD
CQ-102C
FWD
back tension
FF, REW CQ-201B
Adjustment Location : main board (conductor side)
RV601
pinch roller
rubber belt
Meter Reading
more than 1.96 mN • m
(more than 20 g • cm)
(more than 0.28 oz • inch)
0.05 – 0.29 mN • m
(0.5 – 3 g • cm)
(0.007 – 0.04 oz • inch)
more than 4.90 mN • m
(more than 50 g • cm)
(more than 0.69 oz • inch)

ELECTRICAL ADJUSTMENT

• Supplied voltage
• Switch and control position
VOL control
PAUSE switch : OFF
Test tape
Type
WS-48A 3 kHz, 0 dB
P-4-A063 6.3 kHz, - 10dB
REC/PB Head Azimuth Adjustment
Procedure :
1. Model : playback
test tape
P-4-A063
(6.3 kHz, -10 dB)
2. Turn the adjustment screw to obtain the maximum readig on
level meter.
Note : Several peaks may appear, but take the maximum.
Adjustment Location :
adjustment screw
Tape Speed Adjustment
Procedure :
test tape
WS-48A
(3 kHz, 0 dB)
1. Playback WS-48A (tape center part) in the FWD state and adjust
RV601 so that the frequency counter reading becomes
3,000 Hz.
Specification Value :
Digital frequency counter
2,970 to 3,030 Hz
2. Check that frequency counter reading is within 2% of reading
of step 1.
— 5 —
SECTION 4
PRECAUTION
: 3.0 V
: mechanical mid
Signal Used for
tape speed adjustment
head azimuth adjustment
level meter
10 kΩ
set
EAR jack (J102)
frequency counter
32 Ω
+
set
–
EAR jack (J102)
+
–