22
0 V
AF oscillator
EXT signal
20 Hz
RSSI output
waveform
Adjust so that they
synchronize at 0 V.
RSSI Waveform
+
–
TP8 (TX VT)
digital voltmeter
TP18 (GND)
+
–
TP9 (RX VT)
TP18 (GND)
digital voltmeter
TP1
TP3 (RF GND)
FM RF
signal generator
TRUNK
LINE
TP101
TP102
600
Ω
+
–
level meter
PBX tester
Carrier frequency : 49.910 MHz
Modulation : 1 kHz
Deviation : FM 3 kHz
Output level : 60 dB
µ
V (1 mV) (EMF)
TP1
TP3 (RF GND)
+
–
+
–
+
–
+
–
TP10 (SIG OUT)
TP18 (GND)
AF oscillator
FM RF
signal generator
Output : 20 Hz
Carrier frequency : 49.910MHz
Modulation : 20 Hz (EXT)
Deviation : AM 50%
Output level : 2 dB
µ
V (1.4
µ
V) (EMF)
oscilloscope
(DC range)
CH1 CH2
SECTION 4
ELECTRICAL ADJUSTMENTS
BASE PHONE SECTION
Note:
• Apply 9V dc from regurated DC power supply.
• Perform the adjustment at T3CH (28CH : 49.910 MHz) as a rule.
• Set to base unit manual test mode. (Refer to page 17.)
• Switch position :
S301 (DIAL MODE) : P (pulse)
TX SECTION ADJUSTMENT
• The resistor (50
Ω
) connected TP1 to TP3 (GND). (Only TX
section adjustment)
TX VT Adjustment
Setting :
Procedure :
1. The digital voltmeter connected TP8 (TX VT) to TP18 (GND).
2. Adjust the L3 for 2.2 ± 0.1 V reading on the digital voltmeter.
RX VT Adjustment
Setting :
Procedure :
1. Adjust the FL4 for the maximam reading on the level meter.
RSSI Hi Adjustment
Note:
• Perform the adjustment at T3CH (28CH : 49.910 MHz) as a rule.
Setting :
Procedure :
1. The digital voltmeter connected TP9 (RX VT) to TP18 (GND).
2. Adjust the L4 for 2.8 ± 0.1 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 RV1
so that they are synchronized (duty is synchronized).
RX SECTION ADJUSTMENT
RX DISCRI Adjustment
Note:
• Perform the adjustment at T3CH (28CH : 49.910 MHz) as a rule.
Setting :
Adjustment Location : base main board (See page 23.)
