Mechanical Adjustments; Electrical Adjustments - Sony XR-C340 Service Manual

SECTION 4

MECHANICAL ADJUSTMENTS

1. Clean the following parts with a denatured-alcohol-moistened
swab:
playback head pinch roller
rubber belt capstan
idlers
2. Demagnetize the 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 power supply
voltage unless otherwise noted.
• Torque Measurement
Mode Torqu Meter
Forward CQ-102C
Forward
CQ-102C
Back Tension
Reverse CQ-102RC
Reverse
CA-102RC
Back Tension
FF, REW CQ-201B
• Tape Tension Measurement
Mode Torqu Meter
Forward CQ-403A
Reverse CQ-403R
Tape Speed Adjustment
Procedure:
1. Put the set into the FWD PB mode.
Meter Reading
30–65 g•cm
(0.42–0.90 oz•inch)
Specification: Constant speed
0.5–4.5 g•cm
(0.01–0.06 oz•inch)
30–65 g•cm
(0.42–0.90 oz•inch)
Adjustment Location:
0.5–4.5 g•cm
(0.01–0.06 oz•inch)
60–200 g•cm
(0.83–2.78 oz•inch)
Meter Reading
more than 90 g
(more than 3.18 oz)
more than 90 g
(more than 3.18 oz)
– 15 –
SECTION 5

ELECTRICAL ADJUSTMENTS

TAPE DECK SECTION
test tape
WS-48A
(3 kHz, 0 dB)
set
speaker out terminal
Speed checker
–1.5 to +2.5%
– SET UPPER VIEW –
TAPE SPEED Adjustment
0 dB=0.775 V
speed checker
or
frequency counter
4 Ω
– +
Frequency counter
2,955 to 3,075 Hz