XR-3753, XR-C353 - Sony Car Audio Service Manual (repair manual). Page 14

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

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.

•

Forward

CQ-102C

30 – 65 g•cm

(0.42 – 0.90 oz•inch)

Forward

CQ-102C

0.5 – 4.5 g•cm

Back Tension

(0.01 – 0.06 oz•inch)

Reverse

CQ-102RC

30 – 65 g•cm

(0.42 – 0.90 oz•inch)

Reverse

CA-102RC

0.5 – 4.5 g•cm

Back Tension

(0.01 – 0.06 oz•inch)

FF, REW

CQ-201B

60 – 200 g•cm

(0.83 – 2.78 oz•inch)

Forward

CQ-403A

more than 90 g

(more than 3.18 oz)

Reverse

CQ-403R

more than 90 g

(more than 3.18 oz)

•

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 “power select” switch (S501) is “A” position.
2. Turn ON the regulated power supply. (All LEDs on the set

lights up, and the clock is displayed.)
Note: Press the  OFF  button, if the clock is not displayed.

3. Push the preset 4 button.
4. Push the preset 5 button.
5. Press the preset 1 button for more than two seconds.
6. Then the display indicates all lights, the test mode is set.

<Release the Test mode>
1. Push the  OFF  button.
2. Return the “power select” switch (S501) to initially aet posi-

tion.

See the adjustment location from on page 17 for the
adjustment.

Procedure:
1. Put the set into the FWD PB mode.

–1.5 to +2.5%

2,955 to 3,075 Hz

Specification: Constant speed

Adjustment Location: See page 17.

set

+

–

test tape
WS-48A
(3 kHz, 0 dB)

speaker out terminal

4 

Ω

speed checker

or

frequency counter