Re: Fixing the C900 power supply

From: Michal Pleban <*lists_at_michau.name*> Date: Sat, 03 Jan 2015 21:43:19 +0100 Message-ID: <4220bdf28587dad039e1a38e0e41bd7c@michau.name> · lists_at_michau.name

Hello!

W dniu 2015-01-02 19:30, Gerrit Heitsch napisał(a):

> Well, there are a few things that would be good to know.
> - What are they using as the primary switching transistor?

There is someting that looks ike a big transistor which reads "BUV47A".

> - What are the ICs on the vertical board?

They are a 4006 and a LM339N.

> Also, all capacitors with an 'ROE' logo should be regarded as suspect
> and at least checked if not replaced. They tend to mutate into a short
> circuit internally. I see a few of them on the righthand side.

There are some labeled "ROE" and some labeled "FRAKO". I tested with an 
ohmometer without unsoldering them, and it indicated a short circuit 
everywhere but I am not sure whether is is from a bad capacitor, or from 
some other circuitry in the PSU?

Regards,
Michau.

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