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PM790 Radio Maintenance Manual
36
Power on failure and
current is over 1A
Is the power
cord reversed?
Yes
Reconnect the
power cord
No
Replace the
main PCB
6.5Power On Failure and Current Below 1A
Power on failure and
current is below 1A
Can the radio
display the logo
screen?
Yes
Re-install
the
correct firmware
No
Replace the
main PCB
6.6Power On OK and USB Failure
Power on is OK but
can’t connect USB
Is the USB cable
normal?
Yes
No
Replace the
USB cable
Can the radio reboot
normally when USB
cable connected?
No
Replace the
main PCB
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