Read Sony DHC-MD7 / ST-M9 Service Manual online
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0DB=1
µ
V
Note: As a front-end (FE1) is difficult to repair if faulty, replace it
with new one.
AM SECTION
AM Tuned Level Adjustment
Note: FM Tuned Level adjustment should be performed after this
AM Tuned Level Adjustment.
Setting:
Band: AM
Procedure:
Band: AM
Procedure:
loop antenna
set
30% amplitude
modulation by
400Hz signal
modulation by
400Hz signal
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 1,000 kHz.
3. Adjust RV1 to the point (moment) when the TUNED indicator
3. Adjust RV1 to the point (moment) when the TUNED indicator
will change from going off to going on.
Adjustment Location: MAIN board
FM SECTION
FM Tuned Level Adjustment
Note: This adjustment should be performed after the AM Tuned
Level Adjustment.
Setting:
Band: FM
Procedure:
1. Supply a 26 dB 98 MHz signal from the ANTENNA terminal.
Band: FM
Procedure:
1. Supply a 26 dB 98 MHz signal from the ANTENNA terminal.
AM RF SSG
60cm
loop antenna
(Supplied accessories)
(Supplied accessories)
Modulation: 999 kHz (at 9 kHz step)
1,050 kHz (at 10 kHz step)
output level: 55 dB
Field strength dB (
µ
V/m) = SSG output level dB (
µ
V/m) –26dB.
AM antenna
terminal (TM1)
terminal (TM1)
TM1
FE1
RV2
FM TUNED Level
Adjustment
FM TUNED Level
Adjustment
RV1
AM TUNED Level
Adjustment
AM TUNED Level
Adjustment
SECTION 3
ELECTRICAL ADJUSTMENT
Carrier frequency:98MHz
Modulation:
Modulation:
AUDIO 1kHz, 75kHz
deviation (100%)
deviation (100%)
Output level:
26dB (at 75
Ω
open)
set
FM ANTENNA terminal
(TM1)
(TM1)
75
Ω
coaxial
FM RF SSG
2. Tune the set to 98 MHz.
3. Adjust RV2 to the point (moment) when the TUNED indicator
3. Adjust RV2 to the point (moment) when the TUNED indicator
will change from going off to going on.
Adjustment Location: MAIN board
Adjustment Location
[MAIN BOARD] – Component Side –
[MAIN BOARD] – Component Side –
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