XR-2750, XR-2753 - Sony Car Audio Service Manual (repair manual). Page 17

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This set have the test mode function. In the test mode, FM Auto
Scan/Stop Level and 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.

1. Clean the following parts with a denatured-alcohol-moistened

swab:

playback head

pinch roller

rubber belt

capstan

idler

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 power supply

voltage (14.4 V) unless otherwise noted.

•

Forward

CQ-403A

more than 60 g

Reverse

CQ-403R

(more than 2.12 oz)

•

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

CQ-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)