Re: Amplifone HV

I hate to blow my own horn, but this sounds like a job for my Flyback test
kit. The unit will test HV transformers in circuit and let you know
instantly if the transformer is shorted, open or OK. All you do is hook one
lead to the collector of the output transistor and the common lead to
Common/ground of the circuit. There are a row of LEDs and you just look at
the colour of the LEDs, red is bad, yellow means compare with a good
transformer, and green is good. The kit is inexpensive and a boon to
repairing monitors, along with the ESR kit for checking electrolytic
capacitors in-circuit...very reasonably priced...

Flyback/LOPT kit: http://www.flippers.com/fbt-main.html

ESR meter kit: http://www.flippers.com/esrktmtr.html

I was reluctant to post this but on the other hand folks are selling other
items to help the Vector community so why not these great tools. We use
them in our shop all the time...

John :-#)#

At 09:50 AM 09/04/2002 -0400, Curtis H. Wilbar Jr. wrote:

>I have three amlifone HV boards (1 blue, 1 green, 1 beige, all with
>resistors and diodes at the regs). With the BU406D removed on each they
>all have about the same waveform (one has a bit higher frequency, but all
>the same shape) at BU406D's base.
>
>Only 1 has HV... another makes a quite squealy kind of noise, gets the BU406D
>hot (but doesn't blow it), and produces no HV. The last one produces no
>HV, makes no noise, doesn't blow BU406D and doesn't produce HV.
>
>I'm guessing I have 1 good red, and 2 dead red hv transformers. Before I
>presume that, is there any last things I should check knowing the BU406D
>transistors are fine, with good waveform, but no HV ?
>
>Thanks,
>
>-- Curt
>
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Received on Tue Apr 9 07:56:28 2002