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Matt Hoy

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Since: Mar 31, 2005
Posts: 16



(Msg. 1) Posted: Wed Aug 02, 2006 7:31 am
Post subject: Centipede vertical hold problem
Archived from groups: rec>games>video>arcade>collecting (more info?)
I got a centipede mini yesterday with a dead monitor. Swapped in a
freshly capped GO7 and am having the following problem.

Game boots and plays fine, but the vertical hold on the monitor won't
stay put. The best I can do is a slowly rolling picture. I searched
here and found the info about using pin 12 as a composite sync signal.
I tried that and am still having the problem. Does anybody have any
suggestions? I've tried fiddling with the B+ voltage and all the other
controls on the monitor. Has anybody else had this problem? Could it
be a bad pot on the vertical hold?

thanks
Matt Hoy

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Ken Layton

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Since: Jun 17, 2005
Posts: 281



(Msg. 2) Posted: Wed Aug 02, 2006 8:30 am
Post subject: Re: Centipede vertical hold problem [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
I've seen some problems from a low +5 volts on the gameboard.

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"Wish-Bringer

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Since: May 05, 2006
Posts: 164



(Msg. 3) Posted: Wed Aug 02, 2006 10:36 am
Post subject: Re: Centipede vertical hold problem [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Shouldn't you tie the composite sync onto 2 pins on the g07 board?
Should be j1& j2.
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Matt Hoy

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Since: Mar 31, 2005
Posts: 16



(Msg. 4) Posted: Wed Aug 02, 2006 2:11 pm
Post subject: Re: Centipede vertical hold problem [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
Wish-Bringer (Chad Entringer) wrote:
> Shouldn't you tie the composite sync onto 2 pins on the g07 board?
> Should be j1& j2.


After doing some more reading I think I've got it figured out.

Go7 has 2 input connectors: a six pin and a 3 pin. the 6 pin has RGB,
ground, and H+ and V+ sync. 3 pin connector has H- v- and ground pins.
I've been trying to use the H+ and V+ sync pins, when centpiece is a
NEGATIVE sync game. I'm going to try to use the composite sync off pin
12 of the game edge connector and tie it to both the H - and the V -
pins. Does that sound like it will work?
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Matt Hoy

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Since: Mar 31, 2005
Posts: 16



(Msg. 5) Posted: Wed Aug 02, 2006 6:48 pm
Post subject: Re: Centipede vertical hold problem [Login to view extended thread Info.]
Archived from groups: per prev. post (more info?)
For the archive. This is what fixed the problem. connect pin 12 of
the lower edge connector to the H- and V- snyc connectors.


Matt Hoy wrote:
> Wish-Bringer (Chad Entringer) wrote:
> > Shouldn't you tie the composite sync onto 2 pins on the g07 board?
> > Should be j1& j2.
>
>
> After doing some more reading I think I've got it figured out.
>
> Go7 has 2 input connectors: a six pin and a 3 pin. the 6 pin has RGB,
> ground, and H+ and V+ sync. 3 pin connector has H- v- and ground pins.
> I've been trying to use the H+ and V+ sync pins, when centpiece is a
> NEGATIVE sync game. I'm going to try to use the composite sync off pin
> 12 of the game edge connector and tie it to both the H - and the V -
> pins. Does that sound like it will work?
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