XR-4950X, XR-4954X - Sony Car Audio Service Manual (repair manual). Page 17

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

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.

•

Mode

Tension Meter

Meter Reading

more than 0.88N

Forward

CQ-403A

more than 90 g

(more than 3.18 oz)

more than 0.88N

Reverse

CQ-403R

more than 90 g

(more than 3.18 oz)

•

Mode

Torque Meter

Meter Reading

2.95 – 6.37 N•m

Forward

CQ-102C

30 – 65 g•cm

(0.42 – 0.90 oz•inch)

Forward

0.05 – 0.44 N•m

Back Tension

CQ-102C

0.5 – 4.5 g•cm

(0.01 – 0.06 oz•inch)

2.95 – 6.37 N•m

Reverse

CQ-102RC

30 – 65 g•cm

(0.42 – 0.90 oz•inch)

Reverse

0.05 – 0.044 N•m

Back Tension

CQ-102RC

0.5 – 4.5 g•cm

(0.01 - 0.06 oz•inch)

5.89 – 19.61N•m

FF, REW

CQ-201B

60 – 200 g•cm

(0.83 – 2.78 oz•inch)

<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.

0 dB=0.775 V

Speed checker

Frequency counter

–1.5 to +2.5%

2,955 to 3,075 Hz

Ω

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

 0 dB=1 µV

The tuner section has no adjustment.

– SET UPPER VIEW –