XDR-M1 - Sony Audio Service Manual (repair manual). Page 8

8

• FM RF Adjustment

The test land VT and GND on the MAIN board used for VT
check.

1. Press the POWER switch to turn on the radio.
2. Press the DAB/FM switch and set to 87.5 MHz.
3. Check that the test land VT voltage is at 2.4±0.5 (1.9 to 2.9)

Vdc using a digital voltmeter.

4. Set the signal generator frequency to 108.0 MHz.
5. Press the ENTER/SC switch and set to 108.0 MHz.
6. Check that the test land VT voltage is at 8.0±1.0 (7.0 to 9.0)

Vdc using a digital voltmeter.

7. Adjust CT1 so that the needle of digital voltmeter indicates the

maximum level. (RF MAX)

8. Set the signal generator frequency to 87.5 MHz.
9. Press the ENTER/SC switch and set to 87.5 MHz.
10. Adjust L301 so that the needle of digital voltmeter indicates the

maximum level. (RF MIN)

L301

VT

IC302

CT1

FM RF ADJUSTMENT

(RF MAX)

L301

FM RF ADJUSTMENT

(RF MIN)

– MAIN BOARD  (SIDE B) –

– MAIN BOARD  (SIDE A) –

GND

1

1

15

16

20

1

10

11

20

11

10

30

IC101

IC301

IC201

6

5

8

1