XR-3750, XR-3758, XR-3759, XR-7750, XR-C350, XRS-888 - Sony Car Audio Service Manual (repair manual). Page 18

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SECTION  5
ELECTRICAL  ADJUSTMENTS
TEST  MODE
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.
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
Meter Reading
Forward
CQ-102C
35–65 g•cm
(0.49–0.90 oz•inch)
Forward
CQ-102C
0.5–5.0 g•cm
Back Tension
(0.01–0.07 oz•inch)
Reverse
CQ-102RC
35–65 g•cm
(0.49–0.90 oz•inch)
Reverse
CA-102RC
0.5–5.0 g•cm
Back Tension
(0.01–0.07 oz•inch)
FF, REW
CQ-201B
60–200 g•cm
(0.83–2.78 oz•inch)
Mode
Torqu Meter
Meter Reading
Forward
CQ-403A
more than 60 g
Reverse
CQ-403R
(more than 2.12 oz)
•
 Tape Tension Measurement

Display

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