SONY TA-F448EB
Manual de Servicio

SECTION 3 ELECTRICAL ADJUSTMENT
BIAS ADJUSTMENT
Adjustment Procedure: 1. Rotate fully the bias adjusting semi-fixed resistors (RV301 (LCH), RV351 (R-CH)) to the minimum position (counterclockwise). 2. Connect a digital voltmeter to the CN406 (L-CH) and CN407 (R-CH).
pin 1 pin 3 CN406 (L-CH) CN407 (R-CH) � + + �

Connection and Adjustment Location:
[MAIN (A) BOARD] � Component side �

3. Set the slidack to 0 V AC, and press the POWER button (ON) on the set. 4. Raise gradually the slidack voltage up to the rated voltage (230 V AC). 5. At this time, confirm that the speaker relay is turned on (it will click). 6. Adjust the RV301 (L-CH) and RV351 (R-CH) so that a reading of digital voltmeter is from 10 mV to 20 mV. 7. Return the slidack to 0 V AC, and press the POWER button (OFF) on the set.

C372 C322

RV351 (R-CH) BIAS Adjustment

RV301 (L-CH)

[MAIN (B) BOARD] � Component side �

CN407 3 1

digital voltmeter C459
+ �

C409

1

3

CN406

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