CDX-2160, EXCD-206 - Sony Car Audio Service Manual (repair manual). Page 14

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Procedure :

Adjust for following value reading on digital voltmeter.

Frequency Display

87.5 MHz

107.9 MHz

Reading on Digital voltmeter

1.42 ± 0.05 V

7.2 ± 0.5 V

Adjustment Part

T4

(confirmation)

Adjustment Location : See page 18.

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

When the tuner unit is defective, replace it by a new one because
its internal block is difficult to repair.

FM VT Voltage Adjustment
Setting :

FM/AM button

: FM

Frequency Select switch (E model) : FM 200k

+

–

FM Center Adjustment
Setting :

FM/AM button

: FM

Frequency Select switch (E model) : FM 200k

50 Ω

50 Ω

50 Ω

50 Ω

+

–

IC2 pin !¶

IC2 pin !£

Procedure :
1. Adjust T5 on TU1 so that the reading on the digital voltmeter

becomes in 0 ± 50 mV.

2. Output an Fcenter 10 dB signal output from FM RF signal

generator so that the LINE OUT REAR jack is –20 dBs.

3. Change the FM RF signal generator frequency and check the

deviation of the frequency on + side and – side when the LINE
OUT REAR jack drops 3 dB. (Both + side and – side is approx.
50 kHz.)

4. Re-adjust T5 on TU1 when the difference deviation of the

frequency does more than 10 kHz.

Adjustment Location : See page 18