Centipede - no 5v?

dkblue

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Hi again,

I decided to give my Golden Tee monitor problem a rest for awhile and move on to other projects.

I looked around around the forum and saw some people having too high of voltage when they were supposed to have 5v, but I couldn't find anything about not getting anything where 5v was required. Is this also a symptom of the famous 7905?

Thanks...
 
Nope, the 7905 is the negative 5v regulator. The plus 5v missing would be the big LM305 regulator.
 
Nope, the 7905 is the negative 5v regulator. The plus 5v missing would be the big LM305 regulator.

I guess I should include that I'm not getting - or + 5v to the connector. Would that be an indication of something else gone kaput?

Thanks.
 
Hmmm, looks like it's showing about 0.26v. I measured the 12v on the other side and its just under 12v.


Well, fuse F3 is blown.....or the fuse holder is shot (or both). You might want to check the bridge under the transformer assembly. It might be blown...or have burnt leads.

And if -5VDC is (also) gone....check the 7905.

Edward
 
Well, fuse F3 is blown.....or the fuse holder is shot (or both). You might want to check the bridge under the transformer assembly. It might be blown...or have burnt leads.

And if -5VDC is (also) gone....check the 7905.

Edward


Well, I check out everything suggest with the exception of the 7905. Not sure how to test that.

I added an external 5v just to see what happens and got a picture... somewhat. So I guess 2 things:

#1 Are these ar boards worth trying to fix or is it less of a hassle to find a "tested" one on, sya ebay.
#2 Any idea what is up with the picture? Sync? It looks like everything's connected but maybe I have something backwards. (sorry for the flash)
 

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Looks like the horiz hold is off. Double-triple check your connection between the board and monitor. Also check the adjustment on the monitor too.
 
Looks like the horiz hold is off. Double-triple check your connection between the board and monitor. Also check the adjustment on the monitor too.

As it turns out, the screwed up screen came from providing my external +-5v too late in the power on process.

I have a fully functioning game (well, except for the coin mechs for some reason) for the most part. I just need to figure out the 5v problem. At least I have a workaround if worse comes to worse.
 
Update:

I must have missed the suggestion to check the bridge rectifier initially. I checked it a few weeks ago, it's shot. I order a new one and the game fires up with no problem. And it only took me 3 years! Now I just need to restore the cabinet.

It's a little late, but thanks for all the help.
 
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