tech: Super Pacman

[RobWalmsley]

[ukvac] tech: Super Pacman
Hi

I came by an untested Super Pacman (guess where from)
and tried to rig it up to my Jamma cab.

I only wired 5v, gnd, rgb and sync; the monitor was
just warming up and I could see some red text
appearing (which was quite a surprise really) when the
whole thing went dead.

I assumed than something on the board had popped in
protest at being woken up after 20 years.

After a bit of fishing around I realised my 2 month
old switcher was outputing 2.65v on the 5v and 6.7v on
the 12v, very odd. Turning the 5v didn't effect the
output voltage.

CPC rather nicely replaced my dud switcher, they
omitted to ask if I had wired it upto a 20 year old
Super Pacman and I failed to mention it.

So what now, was it a faulty switcher waiting to
break, or a switcher breaking Super Pacman?

What do I need to check on the Super Pacman to make
sure it is ok before I wire it up again.

Would fusing the 5v & 12v lines be a good idea as the
fuse in the switcher didn't save it.

Thanks

Rob
(Hey look I didn't mention BBC software once)

__________________________________
Do you Yahoo!?
The New Yahoo! Shopping - with improved product search
http://shopping.yahoo.com

 

[John Bennett]

Re: [ukvac] tech: Super Pacman
You could measure the resistance from 5v to GND and 12v to GND to check if there's a short or near short. Most arcade switchers should have short circuit protection anyway, but I've had a couple of <1 year old Happ Controls PSU's go pop even without a short.

Message date : Oct 02 2003, 03:49 PM
From : Rob Walmsley
To : ukvac@yahoogroups.com
Copy to :
Subject : [ukvac] tech: Super Pacman
Hi

I came by an untested Super Pacman (guess where from)
and tried to rig it up to my Jamma cab.

I only wired 5v, gnd, rgb and sync; the monitor was
just warming up and I could see some red text
appearing (which was quite a surprise really) when the
whole thing went dead.

I assumed than something on the board had popped in
protest at being woken up after 20 years.

After a bit of fishing around I realised my 2 month
old switcher was outputing 2.65v on the 5v and 6.7v on
the 12v, very odd. Turning the 5v didn't effect the
output voltage.

CPC rather nicely replaced my dud switcher, they
omitted to ask if I had wired it upto a 20 year old
Super Pacman and I failed to mention it.

So what now, was it a faulty switcher waiting to
break, or a switcher breaking Super Pacman?

What do I need to check on the Super Pacman to make
sure it is ok before I wire it up again.

Would fusing the 5v & 12v lines be a good idea as the
fuse in the switcher didn't save it.

Thanks

Rob
(Hey look I didn't mention BBC software once)

__________________________________
Do you Yahoo!?
The New Yahoo! Shopping - with improved product search
http://shopping.yahoo.com



DATA Imported from archives: originally posted by (steve@coule.freeserve.co.uk)

 

[eggwheatis]

Re: [ukvac] tech: Super Pacman
Yeh I've had a super pac linear psu killed by some
kind of short on the +5. It measures 20ohms between
ground an +5 on the board. Funny as the said board
works fine on my test rig without shutting down the
switcher.

My spare worker measures 500ohms which I guess is what
it should be..

Cheers, Phil.

--- steve@coule.freeserve.co.uk wrote: > You could
measure the resistance from 5v to GND and
> 12v to GND to check if there's a short or near
> short. Most arcade switchers should have short
> circuit protection anyway, but I've had a couple of
> <1 year old Happ Controls PSU's go pop even without
> a short.
>
> Message date : Oct 02 2003, 03:49 PM
> From : Rob Walmsley
> To : ukvac@yahoogroups.com
> Copy to :
> Subject : [ukvac] tech: Super Pacman
> Hi
>
> I came by an untested Super Pacman (guess where
> from)
> and tried to rig it up to my Jamma cab.
>
> I only wired 5v, gnd, rgb and sync; the monitor was
> just warming up and I could see some red text
> appearing (which was quite a surprise really) when
> the
> whole thing went dead.
>
> I assumed than something on the board had popped in
> protest at being woken up after 20 years.
>
> After a bit of fishing around I realised my 2 month
> old switcher was outputing 2.65v on the 5v and 6.7v
> on
> the 12v, very odd. Turning the 5v didn't effect the
> output voltage.
>
> CPC rather nicely replaced my dud switcher, they
> omitted to ask if I had wired it upto a 20 year old
> Super Pacman and I failed to mention it.
>
> So what now, was it a faulty switcher waiting to
> break, or a switcher breaking Super Pacman?
>
> What do I need to check on the Super Pacman to make
> sure it is ok before I wire it up again.
>
> Would fusing the 5v & 12v lines be a good idea as
> the
> fuse in the switcher didn't save it.
>
> Thanks
>
> Rob
> (Hey look I didn't mention BBC software once)
>
> __________________________________
> Do you Yahoo!?
> The New Yahoo! Shopping - with improved product
> search
> http://shopping.yahoo.com
>
>