Sony SPP-Q123, Руководство по обслуживанию

Страница: 14 / 30

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HANDSET SECTION
Note:
•
Apply 4V dc from regurated DC power supply.
•
Perform the adjustment at T1CH (26CH : 43.780MHz) as a rule.
•
Set to handset machine test mode. (Refer to page 10.)
TX SECTION ADJUSTMENT
TX VT Adjustment
Setting :
Procedure :
1. The digital voltmeter connected TP6 (TX VT) to TP3 (GND).
2. Adjust the L52 for 1.2 ± 0.05V reading on the digital voltmeter.
RX VT Adjustment
Setting :
Procedure :
1. The digital voltmeter connected TP5 (RX VT) to TP3 (GND).
2. Adjust the L102 for 0.8 ± 0.05V reading on the digital voltme-
ter.
RX SECTION ADJUSTMENT
RX Level Adjustment
Note:
•
Perform the adjustment at T1CH (26CH : 43.780MHz) as a rule.
Setting :
Procedure :
1. Adjust the FL101 for the maximam reading on the level meter.
Also check that the output level is the specified values.
Specified Value : –8.6 to –16.6dBV
RSSI(H) Sensitivity Adjustment
Note:
•
Perform the adjustment at T1CH (26CH : 43.780MHz) as a rule.
Setting :
Procedure :
1. Use the osclloscope to confirm the FM RF signal generator in-
put (AF) signal waveform and RSSI signal, and use the RV101
so that they are synchronized (duty is synchronized).
Adjustment Location :
+
–
digital voltmeter
TP6 (TX VT)
TP3 (GND)
+
–
digital voltmeter
TP5 (RX VT)
TP3 (GND)
FM RF
signal generator
Carrier frequency: 43.780 MHz
Modulation: 1 kHz
Deviation: 3 kHz
Output level: 60 dB
µ
V (1 mV) (EMF)
TP2
TP3 (GND)
+
–
level meter
TP27 (SP)
TP26 (SP)
FM RF
signal generator
Carrier frequency: 43.780 MHz
Modulation: 20 Hz (EXT)
Deviation: AM 50%
Output level: 2 dB
µ
V (1.259
µ
V) (EMF)
TP2
TP3 (GND)
AF oscllator
Output: 20 Hz
+
–
osclloscope
(DC range)
TP9 (SIG IN)
TP3 (GND)
0V
Adjust so that they
synchronize at 0V.
RSSI output waveform RF signal EXT
signal 20Hz
RSSI WAVEFORM
– hand main board (component side) –
RV101
FL101
L52
L102
TP26 (SP)
TP9 (SIG IN)
– hand main board (conductor side) –
TP6 (TX VT) TP5 (RX VT)
TP3 (GND)
TP2
TP27 (SP)
IC101
IC501