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Fred McKenzie Fred McKenzie is offline
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Default Bearcat BC855XLT Looses it's Memory Occasionally

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My Bearcat BC855XLT looses it's memory once in a great
while. Note: I am a service technician.

I did NOT find (Google search) a schematic for this scanner.

This scanner has a "unique capacitor type memory back-up".

I would like to modify this scanner and use a battery back-up because
it is a HASSLE to reprogram the 50 channels.

Does anyone know where I can find (willing to buy it) schematic?


Does anyone know where I can find the modification I want to make
to maintain memory?


I have a Radio Shack HTX-10 transceiver with that problem. When
disconnected from any power source, memory contents were maintained by
the charge on a 220 Microfarad capacitor. Over a month, memory contents
were lost due to leakage.

I installed a 3.6 Volt Lithium battery, isolated by a 1N4004 diode,
across the capacitor. This approach may work for you if the operating
memory voltage is higher than 3.6 Volts.

Last time I checked, memory contents were still good after ten years!