Read Sony MHC-W55 / STR-W55 (serv.man2) Service Manual online
– 5 –
SECTION 3
ELECTRICAL ADJUSTMENTS
Precautions in Repairing
Note. 1 :
The adjustment should be performed in the publication.
(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)
Band :AM ( MW)
set
AM RF signal
generator
generator
Carrier frequency : 999kHz
loop antenna B
loop antenna A
Procedure :
1. Set loop antenna A so that the loop antenna B input level becomes
55dB
µ
/m (0.6mV/m).
2. Tune the set to 999kHz .
3. Adjust RV41 so that the TUNED indicator goes on.
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
Band : FM
set
FM RF stereo signal
generator
generator
FM ANTENNA terminal
Carrier frequency : 98MHz
Modulation
Modulation
: OFF
Output level
:0.018mV (25dB
µ
)
75
Ω
coaxial
Procedure :
1. Tune the set to 98MHz.
2. Adjust RV42 so that the TUNED indicator goes on.
2. Adjust RV42 so that the TUNED indicator goes on.
Adjustment Location : TCB board
Adjustment Location :
[ TCB BOARD ] – Component side –
RV42 : FM Tuned Indication Lighting Level
RV41 : AM Tuned Indication Lighting Level
FE1
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