SONY STRW777
Manual de Servicio

SECTION 4 ELECTRICAL ADJUSTMENT
TUNER SECTION 0dB=1µV

Note 1: As a front-end (FE1) is difficult to repair if faulty, replace it with new one. Note 2: No adjustment is needed for a tuner pack except for AEP, UK, East European, CIS models. AM Tuned Level Adjustment (AEP, UK, East European, CIS model) Note: FM Tuned Level Adjustment should be performed after this AM Tuned Level Adjustment. Setting: Band: MW
loop antenna loop antenna (Supplied accessories)

AM RF SSG set

30% amplitude modulation by 400Hz signal Modulation: 999 kHz (at 9 kHz step) 1,050 kHz (at 10 kHz step)

60cm

AM antenna terminal (TM1)

Field strength dB (µV/m) = SSG output level dB (µV/m) �26dB.

Procedure: 1. Set the output of SSG so that the input level of the set becomes 55 dB. 2. Tune the set to 999 kHz or 1,050 kHz. 3. Adjust RV41 to the point (moment) when the TUNED indicator will change from going off to going on. Adjustment Location: TCB board FM Tuned Level Adjustment (AEP, UK, East European, CIS model) Note: This adjustment should be performed after the AM Tuned Level Adjustment. Setting: Band: FM
FM RF SSG 75 � coaxial

Adjustment Location [TCB BOARD] (Component Side)

TM1 RV41 AM Tuned Level

RV42 FM Tuned Level IC21 set

Carrier frequency: 98MHz Modulation: AUDIO 1kHz, 75kHz deviation (100%) Output level: 25dB (at 75 � open)

FM ANTENNA terminal (TM1)

Procedure: 1. Supply a 25 dB 98 MHz signal from the ANTENNA terminal. 2. Tune the set to 98 MHz. 3. Adjust RV42 to the point (moment) when the TUNED indicator will change from going off to going on. Adjustment Location: TCB board

� 10 �