Archived from groups: rec.games.video.arcade.collecting (
More info?)
If you're going that distance, you may as well install a switching power
supply as long as you don't mind not being original. Bob Roberts has a nice
adapter arrangement so you don't have to hack your cabinet and can restore
it back to the original transformer arrangement although I wouldn't
understand why you'd want to do that. You will be rid of the wavy lines
forever and can unsolder that ugly yellow strap.
If you decide to stay with the original transformer and fuse block
arrangement, you MUST change the molex connector pins (on the power contacts
at least) when you replace the fuse block. As the original contacts weaken
and and make poorer and poorer contact with the board, the contact starts
acting like a resistor and heats up. How many poor pac boards have you seen
with the A B/1 2 wide contact charred? I've repaired so many I've lost
count. If you use the switcher, it is more forgiving of the higher
resistance of the contacts as you are delivering less current to the board
through the contacts to begin with and won't have the heat buildup.
Best Regards,
Bill
"thrushguy" <garons@comcast.net> wrote in message
news:F9idndJ_QNzYuGzfRVn-2g@comcast.com...
> I find that it's usually not the edge connector on the board itself, but
the
> black molex. The pins wear down over time and don't have the spring they
> used to and they tend to corrode much like anything else. It's a pain in
> the ass to swap them out but it's well worth the trouble. If you decide
to
> swap it just do it one pin at a time, don't sever the whole old one and
then
> try to use the color coding on it, it can be troublesome. Bob Roberts
sells
> a little kit with a new Molex and the fuse holders in one baggie.
>
> Scott
>
> www.agelessarcade.com
>
>
> "Matthew DeSantis" <md4l@andrew.cmu.edu> wrote in message
> news:dcr705$c63$1@usenet02.sei.cmu.edu...
> > Mike wrote:
> >> Hi all,
> >>
> >> Trying to resolve that "wavy problem"
> >> so I want to nail down all the grounds.
> >>
> >
> > Some people recommend replacing the fuse block / fuses. But I have found
> > that bad edge connector contact comes up at least as often if not more
> > as the cause of the hum. Sometimes the contacts within the connector
> > get loose and do not make good contact with the board. Other times the
> > contacts are slightly misaligned by a few mm and they interfere with
> > adjacent contacts.
> >
> > Matt
>
>