XIEGU
Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver
XIEGU All Rights Reserved Version No.: 1.0 2022-07 Page
40
of
48
Fault phenomenon: no power
Maintenance methods:
1. Adopt the stage-by-stage signal inspection method to troubleshoot
such faults. The signal measurement at each check point shall be as
follows:
Name
Setting Parameters
Parameter 1
Parameter 2
Parameter
3
Oscilloscope
Time base: 50ns
Y-axis:
0.2
～
20V
X10 gear
Connect the transmitting small signal line, connect the test hand
microphone, and switch the test tooling to the transmitting state
Checkpoint
Frequency
MHz
Amplitude
Vpp
Name
B18
14.27
0.62
Power amplifier
input signal
B19
14.27
2.4
Preamp output
B20
14.27
1.84
Three-wire
transformer output
B21
14.27
10.2
RD06 output
B22
14.27
17
～
18.5
RD16 input
B23
14.27
118
Power amplifier
transformer output
B24
14.27
98
～
100
Antenna port
output
2. When the amplitude of a certain stage is significantly different from
the above standard amplitude, it should be re-detected and positioned.
3. When no signal is detected at B18 checkpoint, it is necessary to
consider whether the IPX signal line is damaged.
