Read Sony ST-SB920 Service Manual online
— 7 —
AM SECTION
AM Meter Level Adjustment
Setting:
BAND : LW
BAND : LW
Procedure:
1. Set AM RF signal generator so that the AM antenna input level
1. Set AM RF signal generator so that the AM antenna input level
becomes 74dBµ/m.
2. Adjust RV402 so that 1 to 10 indication bars light up on the
signal meter.
Adjustment Location
[TUNER BOARD] — Component Side —
AM RF SSG
loop antenna
set
loop antenna
(Supplied accessories)
(Supplied accessories)
60 cm
AM antenna
terminal (TM1)
terminal (TM1)
30% amplitude
modulation by
400 Hz signal
modulation by
400 Hz signal
Carrier frequency : 216kHz
Modulation : AUDIO 400Hz, 30% modulation
Modulation : AUDIO 400Hz, 30% modulation
Field strength dB (
µ
V/m) =SSG output level dB (
µ
V/m) –26 dB.
FE101
RV402
AM Meter Level
RV251
Stereo Level
RV221
FM Meter Level
RV231
Narrow Gain
Narrow Gain
IFT252
(NULL)
(NULL)
TP251 (NULL)
RV301
Stereo
Separation
IFT253
(THD)
IFT252, 253
FM Discriminator
CNP702
1
8
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