Sony SPP-114, Руководство по обслуживанию

Страница: 14 / 32

14
0 V
Adjust so that they
synchronize at 0 V.
RSSI output waveform AF oscillator
EXT signal
20 Hz
RSSI WAVEFORM
+
–
oscilloscope
(DC range)
TP9 (SIG IN)
TP3 (RX GND)
FM RF
signal generator
TP2
TP3 (RX GND)
AF oscillator
Output: 20 Hz
+
–
level meter
TP26 (SP)
TP27 (SP)
FM RF
signal generator
TP2
TP3 (RX GND)
+
–
digital voltmeter
TP5 (RX VT)
TP3 (RX GND)
+
–
digital voltmeter
TP6 (TX VT)
TP30 (TX GND)
HANDSET SECTION
Note:
• Apply 3.6 V dc from regurated DC power supply.
• Perform the adjustment at T1CH (26CH : 43.780 MHz) as a rule.
• Set to handset manual test mode. (Refer to page 9.)
TX SECTION ADJUSTMENT
TX VT Adjustment
Setting :
Procedure :
1. The digital voltmeter connected TP6 (TX VT) to TP30
(TX GND).
2. Adjust the L52 for 0.9 ± 0.05 V reading on the digital
voltmeter.
RX VT Adjustment
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 : –9.5 to –15.5 dBV
RSSI Hi Adjustment
Note:
• Perform the adjustment at T1CH (26CH : 43.780 MHz) as a rule.
Setting :
Procedure :
1. The digital voltmeter connected TP5 (RX VT) to TP3
(RX GND).
2. Adjust the L102 for 3.0 ± 0.05 V reading on the digital
voltmeter.
Procedure :
1. Use the oscilloscope to confirm the FM RF signal generator
input (AF) signal waveform and RSSI signal, and use the
RV101 so that they are synchronized (duty is synchronized).
Carrier frequency : 43.780 MHz
Modulation
: 1 kHz
Deviation : FM 3 kHz
Output level : 60 dBµV (1 mV) (EMF)
RX SECTION ADJUSTMENT
RX LEVEL Adjustment
Note:
• Perform the adjustment at T1CH (26CH : 43.780 MHz) as a rule.
Setting :
VOL switch : M
Carrier frequency : 43.780 MHz
Modulation
: 20 Hz (EXT)
Deviation : AM 50%
Output level : 5.5 dBµV (1.88 µV) (EMF)
Adjustment Location : hand main board (See page 15.)