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 2.GQ Geiger Muller Counter
 GMC 500+ stops counting when plugged in

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T O P I C    R E V I E W
mvmaltese66 Posted - 07/13/2025 : 15:35:58
GMC 500+ has recently stopped counting when unit is plugged in and powered. It counts with battery power but not when externally powered. Tried 3 different cables, outlets and no change.

NOW it cannot shut off when power button is held down. Have to take battery out.

ALSO realized the clock is now running slow.

Current firmware: 1.12

Any advice?
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EmfDev Posted - 07/16/2025 : 13:22:07
that is weird. you may need to send it back for service.

also try increasing the tube voltage. or do a factory reset first.

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