Mechanical Adjustments; Electrical Adjustments; Test Mode - Sony XR-3750 Service Manual

SECTION 4

MECHANICAL ADJUSTMENTS

1. Clean the following parts with a denatured-alcohol-moistened
swab:
playback head pinch roller
erase head rubber belts
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
This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and AM (MW) Auto Scan/Stop Level adjustments
can be performed easier than it in ordinary procedure.
<Set the Test Mode>
1. Set the "OFF" mode.
2. Push the preset 4 button.
3. Push the preset 5 button.
4. Press the preset 1 button for more than two seconds.
5. Then the display indicates all lights, the test mode is set.
<Release the Test mode>
1. Push the "OFF" button.
Meter Reading
35–65 g•cm
(0.49–0.90 oz•inch)
0.5–5.0 g•cm
(0.01–0.07 oz•inch)
35–65 g•cm
(0.49–0.90 oz•inch)
0.5–5.0 g•cm
(0.01–0.07 oz•inch)
60–200 g•cm
(0.83–2.78 oz•inch)
Meter Reading
more than 60 g
(more than 2.12 oz)
– 18 –
SECTION 5

ELECTRICAL ADJUSTMENTS

TEST MODE