Service Manual

27
lock voltage is within
the required range.
Rotate to
CH3.
Check
≥2.3V
Wide
Rotate to
CH1, CH2
and CH3
respectively.
Press PTT
to transmit.
Adjust VR200 with a
ceramic alignment
screwdriver to limit
the deviation to the
specified range.
3.7-4.3KHz
Max.
Deviation
Narrow
Rotate to
CH4, CH5
and CH6
respectively.
Press PTT
to transmit.
Radio
communication
test set
LPF: 15kHz
AF:1kHz
150mV
VR200
Check
1.7-2.2KHz
Wide
Rotate to
CH1, CH2
and CH3
respectively.
Press PTT
to transmit.
Adjust the audio
output signal of the
radio communication
test set to get the
deviation to 3.0KHz.
10-20mV
Modulation
Sensitivity
Narrow
Rotate to
CH4, CH5
and CH6
respectively.
Press PTT
to transmit.
Radio
communication
test set
BPF: 0.3-3KHz
AF: 1KHz
Antenna
Earpiece
jack
Adjust the audio
output signal of the
radio communication
test set to get the
deviation to 1.5KHz.
10-20mV
Adjustments in the adjustment mode
Note: The antenna or load must be connected before adjusting.
Measurement Adjustment
Adjustment Item Condition
Test Equipment
Test
Point
Parts Method
Specifications/
Remarks
Rotate to CH4.
Press PTT to
enable the
function.
Low frequency
Tx Power
High
Short press
PTT to switch
frequencies
periodically
(refer to the
adjustment list)
Radio
communication test
set
Ammeter
Antenna
port
SK1
SK2
Press SK1/SK2 to
increase/decrease the
output power and
rotate the channel
selector knob to save.
4.5-5W
I≤1.7A