Re: WG6100 focus problem

Geez, all the suggestions so far sound expensive, let's try something
way less expensive. It could be ZD902, the 150 volt, 1 watt, 5% zener
diode. I had one of these go once and it did about the same thing.

An SK150V or NTE5100A will do the job or something like a DigiKey
2EZ150D5MSCT-ND at $.75 each (this is a 2 watt part, not really a bad
thing). Mouser lists both the NTE and SK parts but has no stock on either.

Danny Pearson wrote:

> Hi all, apologies if you've read this already on RGVAC. Basically my
> Tempest's WG6100 has a real annoying problem - it's losing focus and
> brightness after about 10 minutes. To date I've re-capped it,
> reflowed ALL the solder on the HV and Neck boards, I've added tension
> to the neck board connectors, replaced ZD902, and swapped in known
> good MPSA06 transistors into Q901 and Q902 all with no change :(
> Can anyone explain what can cause a failure like this after 10 minutes
> or so? I'm assuming something is getting warm and ceasing to
> function correctly. Another observation I have made is that I can
> get the picture back for a short time if I fiddle with the brightness
> and focus pots - i.e if I turn them both up full and then readjust for
> normal viewing.
>
> As this stage I'm pretty much stumped. If anyone can offer any
> help/suggestions I'd greatly appreciate it. Alternativley if anyone
> has a working HV box for sale (I'm assuming that's where my problem
> is) or indeed a fully working 6100/Amplifone please let me know!
>
> Cheers
>
> Danny.
>
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Received on Sun Aug 25 21:47:23 2002