Service Manual

29
Low frequency
Press PTT to
switch other
frequencies
(medium-low,
medium,
medium-high
and high)
Wide
Rotate to
CH6, CH7 and
CH8
respectively
and CTCSS is
set to low,
medium and
high. Press
PTT to enable
this function.
Wide band
Short press
PTT to switch
frequencies on
each channel.
Adjust VR601 with a
ceramic alignment
screwdriver and check
each frequency.
Adjust finely with SK1
and SK2 to limit the
CTCSS deviation to
the required range if
necessary.
500-800Hz
CTCSS
Deviation
Narrow
Long press
PTT (≥1.5s) to
enter narrow
band on CH6,
CH7 and CH8
and short press
PTT to switch
frequencies.
Radio
communication test
set
LPF:0.3KHz
Antenna
VR601
SK1
SK2
Check 300-500Hz
Low Tx Voltage
Threshold
Digital voltmeter
Power
supply
port
Power
supply
Adjust the output
voltage of the power
supply and check the
alarm level
6.2V-7.0V(≤7.0V:
LED flashes;
≤6.2V: the alarm
tone sounds and
transmission
suspended)
Low voltage
Power-Off Level
Digital voltmeter
Power
supply
port
Power
supply
Adjust the output
voltage of the power
supply and check the
power-off level
<5.80V