Arcade Collecting > Restorations & repair

Galaga Machine project - It's now ALIVE!

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Cyberflexx:
I just picked up a Galaga from a guy for $100 but ended up spending $98.50 since there was some coins in the bottom.  I just brought it home and started to tinker with it.  When it powers up, you hear a high pitched squeal and there is zeros and red 6's on the screen.  Anyone know how to fix this?  See pictures for the error screen.

There is a chip in the front panel, near the coindoor.  I can fill that in with bondo or something and sand it and paint.  There are some scratches in the sideart, that I can deal with until I get new artwork purchased ( after i get it working).  The monitor has some burn in, the marquee is very nice.  It also came with 20 years of dust inside.. whoo hoo!


Anyone know how to fix this error?

Thanks!

Mauzy:
Nice find! Does the high pitched squeal sound like a single note tone being held? If so, thats part of the normal start up. It should squeal for a while then you'll hear the BOOM when it goes into attract mode.

As for the 0s and 6s, check your voltages and check the legs on your custom chips (2L, 2J, 2H, 2E, etc) for corrosion.

RayB:
Nice. Your side art stickers are all intact! Lucky you.

Cyberflexx:

--- Quote from: Mauzy on October 26, 2008, 11:09:10 am ---Nice find! Does the high pitched squeal sound like a single note tone being held? If so, thats part of the normal start up. It should squeal for a while then you'll hear the BOOM when it goes into attract mode.

As for the 0s and 6s, check your voltages and check the legs on your custom chips (2L, 2J, 2H, 2E, etc) for corrosion.

--- End quote ---

Thanks Mauzy for the advice.  I'll try to check that today or tomorrow.   The squeal is really high pitched, a single tone the same pitch.  I let it run for 5 min. and it never did a Boom and stayed with the 000 and 6666 on the screen. 

I did notice on the power supply that I think it's J1 molex connector, the pin 1 and 2 look to have been scorched.  I cleaned the pins thinking corrosion might have made them loose.  I noticed with I jiggle the 2 wires in the socket, it will stop working, and start again.  I will have to re-pin that connector.  i am going to put a switching powersupply in it but I am a little unsure on doing that.


Anyone have a tutorial with pictures on how to put a switching powersupply in a classic cabinet?

channelmaniac:
Try cleaning the legs 06xx chip on the CPU board and the 04xx chips on the Video board.

If that's not it, then replace the 2114 SRAMs one by one until you find the bad one.

RJ

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