XIEGU
Product Maintenance Manual G90/G90S Portable Short-Wave Transceiver
XIEGU All Rights Reserved Version No.: 1.0 2022-07 Page
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Fault phenomenon: The horn is silent
Maintenance methods:
The instrument settings are as follows:
Name
Setting Parameters
Parameter 1
Parameter 2
Parameter
3
Signal Source
Frequency:
14.271MHz
Amplitude:
-40dBm
/
Oscilloscope
Time base: 1ms
Y-axis:
200mV
X10 gear
After PRE is turned on, the measured data at each checkpoint shall be
as follows:
Checkpoint
Voltage V
Name
A34
8.9
Audio power amplifier
working voltage
Checkpoint
Frequency
Amplitude
mVpp
Name
A33
1kHz
50
Audio signal
voltage
A35
1kHz
680
Audio signal
voltage
Check the welding of the following points:
Fault
Phenomenon
Maintenance Method
Small signal board
Checkpoint
The horn is silent
Check whether there is any false
welding
Horn socket
Horn socket
