Sony MDX-C7900, Service Manual

Page: 19 / 62

RDS S-Meter Adjustment (MDX-C7900R)
Setting:
[SOURCE]
button: FM
Procedure:
1. Set to the test mode. (See page 18.)
2. Push the
[SOURCE]
button and set to FM.
Display
3. Push the preset
[10]
button.
4. Adjust RV1 on MAIN board so that the display indication is
“15.8”.
Display
Specification: Display indication : 15.6 to 16.4
Adjustment Location: See page 20.
AM (MW) Auto Scan/Stop Level Adjustment
Setting:
[SOURCE]
button (MDX-C7900): AM
[SOURCE]
button (MDX-C7900R): MW
Procedure:
1. Set to the test mode. (See page 18.)
2. Push the
[SOURCE]
button and set to FM.
3. Push the
[MODE]
button and set to AM (MDX-C7900) or MW
(MDX-C7900R).
Display
4. Adjust with the volume RV1 on TU1 so that the “AM” or “MW”
indication turns to “AM0” or “MW0” indication on the dis-
play window.
But, in case of already indicated “AM0” or “MW0”, turn the
RV1 so that put out light “0” indication and adjustment.
Display
*2: MDX-C7900R is indicates “MW”.
*3: MDX-C7900R is indicates “999”.
Adjustment Location: See page 20.
– 19 – – 20 –
AM RF signal
generator
Carrier frequency: 1000 kHz (MDX-C7900)
999 kHz (MDX-C7900R)
30% amplitude
modulation by
1 kHz signal
Output level
: 33 dB (44.7
µ
V)
set
AM dummy antenna
(50
Ω
)
30
Ω
15 pF
65 pF
antenna jack (J1)
SHUF
REG
*3
*2
TP
SHUF
REG
*3
*2
TP
FM RF signal
generator
Carrier frequency: 98.0 MHz
Output level
: 35 dB (56.2
µ
V)
Mode : mono
Modulation : no modulation
0.01
µ
F
set
antenna jack (J1)
SHUF
REG
SHUF
REG
Adjustment Location:
– SET UPPER VIEW –
RV1 RDS S-METER Adjustment
TU1
RV1 AM (MW) AUTO SCAN/STOP LEVEL Adjustment
RV2 FM AUTO SCAN/STOP LEVEL Adjustment
RV4 FM STEREO SEPARATION Adjustment