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HANDSET SECTION
Note:
• Apply 4V dc from regurated DC power supply.
• Perform the adjustment at T1CH (26CH : 43.780 MHz) as a rule.
• Set to handset machine test mode. (Refer to page 14.)
TX SECTION ADJUSTMENT
TX VT Adjustment
Setting :
digital voltmeter
+
TP103 (TX VT)
–
TP4 (GND)
Procedure :
1. The digital voltmeter connected TP103 (TX VT) to TP4 (GND).
2. Adjust the L101 for 1.0 ± 0.1V reading on the digital voltmeter.
RX VT Adjustment
Setting :
digital voltmeter
+
TP8 (RX VT)
–
TP4 (GND)
Procedure :
1. The digital voltmeter connected TP8 (RX VT) to TP4 (GND).
2. Adjust the L3 for 3.2 ± 0.1 V reading on the digital voltmeter.
RX SECTION ADJUSTMENT
Power Level Adjustment
Note:
• Connect a resistor of 50 Ω between TP1 and TP4 on Hand main
board before adjustment.
After adjustment, remove the resistor.
Setting:
modulation
analyzer
+
TP1
–
TP4 (GND)
Procedure:
1. The modulation analyzer connected TP1 to TP4 (GND).
2. Adjust the RV101 for 2.0 ± 0.5 mW reading on the modulation
analyzer.
RX DISCRI Adjustment
Note:
• Perform the adjustment at T1CH (26CH : 43.780 MHz) as a rule.
Setting :
FM RF
signal generator
TP1
TP4 (GND)
Carrier frequency : 43.780 MHz
Modulation
: 1 kHz
Deviation
: FM 3 kHz
: 60 dB µ V (1 mV) (EMF)
Output level
level meter
+
TP23 (SP)
–
TP22 (SP)
Procedure :
1. Adjust the L4 for the maximam reading on the level meter.
Also check that the output level is the specified values.
Specified Value : –8.6 to –16.6 dBV
RSSI Hi Adjustment
Note:
• Perform the adjustment at T1CH (26CH : 43.780 MHz) as a rule.
Setting :
FM RF
AF oscillator
signal generator
TP1
TP4 (GND)
Output: 20 Hz
Carrier frequency : 43.780 MHz
Modulation
: 20 Hz (EXT)
Deviation
: AM 50%
: 0 dB µ V (1 µ V) (EMF)
Output level
oscilloscope
(DC range)
+
TP27 (SIG IN)
–
TP4 (GND)
Procedure :
1. Use the oscilloscope to confirm the FM RF signal generator
input (AF) signal waveform and RSSI signal, and use the RV1
so that they are synchronized (duty is synchronized).
RSSI output waveform
RF signal EXT
signal 20 Hz
0 V
Adjust so that they
synchronize at 0 V.
RSSI WAVEFORM
Adjustment Location : hand main board (See page 20).
– 19 –
Adjustment Location :
– hand main board (side A) –
RV101
L101
– hand main board (side B) –
TP23
TP1
TP4
TP22
50 Ω
TP103
L3
L4
RV1
TP8
TP36
TP27
– 20 –
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