Re: Amplifone HV problem

Sorry, Dan, this sounds exactly like the failing of the high voltage
transformer...

John :-#(#

At 03:52 AM 9/29/1999 +0000, you wrote:
>I've got a few Amplifone HV boards and I'm trying to get one up and running.
>Originally the HV was working. After two days it died.
>
>I found the BU406D was bad. Replaced it and had a picture for a short time.
>
> It started smoking and I found the resister across the + 24 regulator was
>smoking.
>
>I replaced the reg and the board seemed to work fine although the pic was a
>little dim. The brightness may have been turned down, but I didn't have
>time to
>tell.
>
>I turned it off and went to eat. I came back turned it on and had a picture. I
>pulled out the HV probe and found the voltage to be at 18K. I started to
>dial up
>the voltage and got to 19.5. A few seconds later it started making a hissing
>noise and the picture went out. I turned it off and then back on and the
>hissing
>noise remained. I checked the HV and it is about 8K and is adjustable from 6 -
>10KV.
>
>I rechecked the regulator and it is only putting out 12 volts. The -24 is
>OK and
>the -/+ 30 is OK coming in.
>
>I have a Red HVT in there. Does this sound like a bad HVT. I'm just
>wondering if
>I should go out and get a 24v regulator or can the reg be good and
>something is
>pulling down the volts?
>
>Thanks for any help.
>
>Dan

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Received on Tue Sep 28 23:51:13 1999