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takeman

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Since: Jun 14, 2005
Posts: 175



(Msg. 1) Posted: Tue May 02, 2006 2:55 am
Post subject: TECH: Qbert Power Supply
Archived from groups: rec>games>video>arcade>collecting, others (more info?)
Hi,
I have been rebuilding a Qbert PS that blows fuse F21 immediately upon
turning the game on. I have all the other voltages except the 30v.
Lots of new parts in that section, including caps (polarity double
checked), new 27v 5w zener at D26, diodes D21-24, 2n3055, power
resistors at R21-22. I checked all solder joints.

I have another working PS that I put in the game and everything works
fine. Sound and all. I have definately isolated the problem to the
power supply.

Anybody have any ideas? I have run out.

I searched Google and could not find any info that helped.

Thanks in advance!

Troy

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Matt J. McCullar

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Since: Mar 06, 2005
Posts: 130



(Msg. 2) Posted: Tue May 02, 2006 8:55 pm
Post subject: Re: Qbert Power Supply [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
I don't have the schematics before me, but is an insulator required between
the 2N3055 transistor and the heat sink?

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Chuk

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Since: Feb 13, 2005
Posts: 431



(Msg. 3) Posted: Tue May 02, 2006 9:09 pm
Post subject: Re: Qbert Power Supply [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
yes

"Matt J. McCullar" <mccullar DeleteThis @flash.net> wrote in message
news:cMS5g.713$zR3.709@newssvr33.news.prodigy.com...
>I don't have the schematics before me, but is an insulator required between
> the 2N3055 transistor and the heat sink?
>
>
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takeman

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Since: Jun 14, 2005
Posts: 175



(Msg. 4) Posted: Wed May 03, 2006 1:07 am
Post subject: Re: Qbert Power Supply [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Matt,
I even put in a new one. I am at a loss here...I am gonna retest every
component...again Sad I know I am overlooking something dumb.

Troy
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