Sony SPP-800 Service Manual page 19

2. RSSI (H) Sensitivity Adjustment
• Perform the adjustment at T1CH (26CH : 43.780MHz) as a rule.
Setting :
[HAND MAIN BOARD]
(Conductor side)
TP3
TP2
C113
R117
FM rf signal
AF oscillator
generator
output : 20Hz
[HAND MAIN BOARD]
(Component side)
Procedure :
1 FM rf signal generator condition :
Carrier frequency
Modulation frequency : 20Hz (EXT)
Deviation
Output level
2 Use the oscilloscope to confirm the FM rf signal generator in-
put (AF) signal waveform and RSSI signal, and use the RV101
so that they are synchronized matched (duty is synchronized).
TP2
TP3
: 43.780MHz
: AM 50%
: 2dBµV (1.259µV) (EMF)
TP9
R506
oscilloscope
TP9
(TP3)
RV101
RSSI output waveform
0V
Adjust so that they
synchronize at 0V.
– 19 –
IC501
+
-
RSSI WAVEFORM
RF signal EXT
signal 20Hz