Re: Got the V2000 HV blues...

After two months, I'm still fighting with this 15V2000. I've gone
through it and can't figure out the root cause of its issue.

It was up and running yesterday for at least 5 hours, sitting on the
floor next to the game. Today, I reinstalled it in the game, and it
kept working fine. Then, I installed the back door on the cabinet, and
30-45 minutes later, the monitor was dark. F102 was blown again.

Conjecture - with the door on, the temperature inside the cabinet rises,
and something on the HV board becomes unhappy. Any ideas? (other than
installing a cooling fan?)

I've replaced all the semiconductors with the exception of Q900 & Q903.
  I swapped in a different HVT. I replaced R905 HV adjust pot. I've
replaced all the caps with the exception of Q903, 908, 909, 910. That
leaves those few exceptions and the resistors. I've checked all the
resistors, but could one be heating up and only then going open or shorted?

I suppose that I can start replacing resistors... #sigh#
Does R900 (21 ohm, 15 watt wire wound) need to be non-inductive?

ARGH!

Thanks,

Alan

Total Impulse wrote:
>
> Trying to wrap up restoration of an Asteroids Deluxe mini, and the HV
> board in the 15V2000 is giving me fits. (When I bought this game, the
> monitor was kaput.)
>
> Went through monitor, installed cap kit and new deflection transistors.
> Replaced all header pins instead of just resoldering them. Monitor
> came up fine, adjusted it, had a great picture. Left the game running,
> came back after about an hour to find the monitor dark. Quick check, no
> high voltage, F102 on the deflection board was blown.
>
> Pulled the HV cage. Checked all the resistors (seemed fine, didn't
> replace any) Did a shotgun replace of Q901, D900, D901, D902, ZD900,
> ZD901, ZD902. (Caps C900, C901, C904, C907 replaced previously.) Pulled
> the HV diode, thoroughly cleaned up the connectors, installed a new
> diode with fresh dielectric grease.
>
> Powered up the monitor and checked the HV over 15+ minutes. Adjusted
> for 14.5kv.
>
> Powered up game, monitor worked and looked great. Left it running and
> within roughly an hour it had gone dark again. F102 blown. #sigh#
>
> I should replace the HV adjustment pot as it seemed a bit flaky, but I
> don't have an appropriate 5k pot on hand.
>
> Any ideas or recommendations?
>
> Thanks,
>
> Alan

-- 
Total Impulse - Just Having Fun!
Alan Estenson, totalimpulse@comcast.net
---------------------------------------------------------------------------
** Unsubscribe, subscribe, or view the archives at http://www.vectorlist.org
** Please direct other questions, comments, or problems to chris@westnet.com