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PM790 Radio Maintenance Manual
42
6.10 No Sound (Speaker) Failure
No Sound
(Speaker) failure
Is the volume
setting normal?
No
Reset the
volume
Yes
Replace the
main PCB
Is the RX LED
indicator on?
No
Yes
Check whether
the speaker is
normal
7 Check After Maintenance
7.1 Check Latest Firmware Version and Device Information
Please refer to 2.2 Check Firmware Version and Device Information.
7.2 Function Check
After the radio maintenance, check if every function is available. Follow the steps:
1. After assemble the radio, check if all screws and components are installed, there should be no
extra screws.
2. Check if the volume/channel knob and channel knob can operate normally.
3. Install the power supply and power on the radio to check that radio can power on normally and
LED indicator is normal.
Summary of Contents for PM790
Page 1: ...1 PM790 Radio MAINTENANCE MANUAL Level1 V1 0...
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