Beomaster 5000 fault

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michaelmaurice Posted: Wed, Jul 1 2015 8:58 AM

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I've been asked to repair a Beomaster 5000 where the volume was at maximum and couldn't be altered.

I removed the back up battery, at first it came on and you could select certain functions.

unplugged unit, fitted a new 3V lithium cell battery.

Upon switching on front display started counting till it reached 2:4 then stays on that. The loudness light is also lit.

Any ideas as to whats happened and how it can be fixed?

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Dillen replied on Wed, Jul 1 2015 5:05 PM

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There is a handful of small capacitors near the voltage regulators, 10uF and 22uF. I've seen them cause the strangest faults.
You do your work in a safe ESD-environment, right ?

Martin

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michaelmaurice replied on Sun, Jul 5 2015 9:29 AM

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I think you are thinking of the Beomaster  5500.  There are no 10uF and 22uF capacitors near the regulators, instead there was a single 1uF which had blown its top.  I replaced it but I still get the same fault.

The display reads 2:8

I've disconnected the back up battery, left if a few minutes then reconnected it but the problem remains,

Michael