Electrical Adjustments - Sony STR-W55 Service Manual

Precautions in Repairing
The adjustment should be performed in the publication.
Note. 1 :
(AM nFM)
Note. 2 : As a front-end (FE1) is difficult to repair if faulty, replace it
with new one.
AM SECTION
AM Tuned Indication Lighting Level
Setting :
Band :AM ( MW)
loop antenna A
AM RF signal
generator
Carrier frequency : 999kHz
Procedure :
1. Set loop antenna A so that the loop antenna B input level becomes
55dBµ/m (0.6mV/m).
2. Tune the set to 999kHz .
3. Adjust RV41 so that the TUNED indicator goes on.
FM SECTION
FM Tuned Indication Lighting Level
Note : Always make the tuning level adjustment first.
(Since it affects the FM tuning level.)
Setting :
Band : FM
FM RF stereo signal
FM ANTENNA terminal
generator
75 Ω coaxial
Carrier frequency : 98MHz
Modulation : OFF
:0.018mV (25dB µ )
Output level
Procedure :
1. Tune the set to 98MHz.
2. Adjust RV42 so that the TUNED indicator goes on.
Adjustment Location : TCB board
SECTION 3

ELECTRICAL ADJUSTMENTS

Adjustment Location :
[ TCB BOARD ] – Component side –
loop antenna B
set
set
– 5 –
RV41 : AM Tuned Indication Lighting Level
RV42 : FM Tuned Indication Lighting Level
FE1