Mechanical Adjustments; Electrical Adjustments; Tape Deck Section; Tuner Section - Sony XR-C5090 Service Manual

SECTION 4

MECHANICAL ADJUSTMENTS

1. Clean the following parts with a denatured-alcohol-moistened
swab:
playback head
rubber belt
idler
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 Torque Meter
Forward CQ-102C
Forward
CQ-102C
Back Tension
Reverse CQ-102RC
Reverse
CQ-102RC
Back Tension
FF, REW CQ-201B
• Tape Tension Measurement
Mode Tension Meter
Forward CQ-403A
Reverse CQ-403R
pinch roller
capstan
Meter Reading
30 - 65 g•cm
(0.42 - 0.90 oz•inch)
0.5 - 4.5g•cm
(0.01 - 0.06 oz•inch)
30 - 65 g•cm
(0.42 - 0.90 oz•inch)
0.5 - 4.5g•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)

ELECTRICAL ADJUSTMENTS

TAPE DECK SECTION

Tape Speed Adjustment
Setting:
test tape
WS-48A
(3 kHz, 0 dB)
Procedure:
1. Put the set into the FWD PB mode.
2. Adjust adjustment resistor for inside capstan motor so that the
reading on the speed checker or frequency counter becomes in
specification.
Specification: Constant speed
Speed checker
–1.5 to +2.5%
Adjustment Location:
– SET UPPER VIEW –

TUNER SECTION

Tuner section is no adjustment.
– 14 –
SECTION 5
0 dB=0.775 V
speed checker
or
frequency counter
4 Ω
set
– +
speaker out terminal
Frequency counter
2,955 to 3,075 Hz
Tape Speed Adjustment