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 device head cannot communicate with the host, and the screen displays
COMM LOST
Fault phenomenon: The starting-up speed is too fast, and it enters the main interface as soon as it
flashes/ cannot enter the flashing state
Fault
Phenomenon
Maintenance Method
Display
Checkpoint
No
communication
between the
device head
and the host
Check whether the MCU pins
are faultily welded and whether
the chip is damaged
B
Check whether the ESD diode
is broken down
G
In addition, note to check whether the DB9 connection board is
faultily welded.
Fault
Phenomenon
Maintenance Method
Display
Checkpoint
Fast starting-up
speed/ failure
to enter the
flashing state
Check whether the two pins of
all buttons are short-circuited by
themselves
Button
Check whether there is
grounding short circuit of all
encoder pins
Encoder
Encoder
Button
Encoder
Button
