Electrical Adjustments - Sony ST-EX880 Service Manual

QQ
3 7 63 1515 0
0 dB=1 µV
Note: As a front-end (FE1) is difficult to repair if faulty, replace it with
new one.
AM Section Adjustment
Setting:
loop antenna
AM RF SSG
30% amplitude
modulation by
400 Hz signal
Carrier frequency : 999 kHz (at 9 k step)
1,000 kHz (at 10 k step)
Output level : 25 dB
AM Tuned Level Adjustment
Band: AM or MW
Procedure:
1. Set the output of SSG so that the input level of the set be-
comes 55 dBµ/m.
2. Tune the set to 999 kHz or 1,000 kHz.
3. Adjust RV1 to the point (moment) when the TUNED indica-
tor will change from going off to going on.
Adjustment Location : MAIN board
FM Section Adjustment
TE
L 13942296513
Note: This adjustment should be performed after the AM Tuned Level
Adjustment due to the same adjustment element.
Setting:
FM RF stereo signal
generator
Carrier frequency : 98 MHz
Modulation : AUDIO 1 kH, 75 kHz
deviation (100%)
µ
Output level : 26 dB (17.8
FM Tuned Level Adjustment
Band: FM
Procedure:
1. Supply a 26 dBµ 98 MHz signal from the ANTENNA termi-
nal.
2. Tune the set to 98 MHz.
3. If the TUNED indicator does not light, adjust RV2 to the point
(moment) when the TUNED indicator will change from going
off to going on.
Adjustment Location: MAIN board
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SECTION 4

ELECTRICAL ADJUSTMENTS

loop antenna
(Supplied accessories)
60 cm
Field strength dB (
75 Ω coaxial
set
FM ANTENNA terminal
(75 Ω open)
µ
V)
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2 9
8
set
AM ANTENNA
terminal
µ
V/m) =SSG output level dB (
Adjustment Location:
[MAIN BOARD] (Component Side)
Q Q
3 6 7 1 3
.
– 6 –
9 4 2 8
µ
V/m) –26 dB.
1 5 0 5 8 2 9 9 4
RV1
IC1
FE1
RV2
m
co
9 9
2 8 9 9