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: It cannot be written into Bootloader or the application
Fault
Phenomenon
Maintenance Method
Small signal board
Checkpoint
Inability to
burn or start up
the application
1. Check whether the 3.3V
power supply is normal
A1
2. Check whether the main
MCU pins are faultily welded
A2
3. Check whether the COMM
socket is connected with the
main MCU pin
A3
Pay attention to the damage of COMM socket, such as short
circuit, open circuit, etc. Measure whether the relevant leads from
A3 to A2 are connected through the on-off position of the
multimeter.
