Heh, well, it's really in fair to good shape, and I have a few with actual structural work that needs to be done before a makeover on this one. Plus, it's all still all a learning process, digging through the forum archives, asking confusing questions..
the cabinet is a bit um..loose, about a 1/8 gap between the control panel sides, so it wouldn't hurt to get that a bit tighter. I am committing to doing the control panel overlay, which gives me back that nice and new look.
I would be more willing to strip and replace the artwork if the stuff was in bad shape.. or true reproductions.. that 'NOS' cpo kinda burnt me on that. I also have spare glass bezels, one of which is in better shape, but saving that for when I'm done pulling parts in/out.
So yeah, at this point I'm kinda using my budget on electronics before artwork. I have a spare complete Galaga power supply/harness, and may go for restoring that to working order and get rid of the modern switching supply, so I consider that a 'restoration' as well..
I have access to a complete workshop to fabricate anything I need cabinet-wise. And I do, at times. But my house is on a hill, and one really needs a well ventilated area for a good stripping/sanding/painting process. No garage,or even a paved driveway for that matter.
I know there's some who are 'restore the cabinet, then fix the game'. My specialty is electronics, so I tend to lean towards game first.
I would like to figure out how to restore that marquee.. the white areas have thinned out somewhat, but I'll practice on a broken marquee I have first. Tricky, that..
As far as the repair.. sorry, I thought I had posted the epic before. The wrong z-80 was from when I was trying my varied spares
to get things going, since my logic probing showed a stop around 1/2 way through the test cycle. Gotta know when you're beat,
though, and refer servicing to qualified service personnel.
Here's what I found on your Galaga board set:
Stops at RAM OK
There were two reasons for this:
1) The Z-80 chip at location 4E was not a Z-80 CPU chip, it was a Z-80 PIO
chip - replaced with correct part.
2) The Custom Namco "06" chip at location 2L was blazing hot - chip was no
good - replaced with known good part.
Now, board almost completes boot-up, but gets to grid pattern and stops,
then resets, and does this process over and over again.
This problem caused by a failed Custom Namco chip "51" at location 4H.
Replaced 51 chip and board boots up all the way.
Next problem:
Board boots up, and coins up - start a game, and it goes for about 20-30
seconds, and freezes, then resets.
While examining the main program, testing device finds intermittent
failure while reading program chip 3M. Replaced all 4 main program chips
with last revision Galaga code. (3K, 3L, 3M and 3N)
Now the board plays without resetting - but the sound / music is not
exactly right - some tones are missing/distorted - this problem caused by
failed sound prom at location 1D - replaced, and the music is correct
again.
Board is ready to run for the 3-day burn-in.
Left running on a Friday, Came into shop on Monday, and the video has
lines in it - this problem caused by failing Custom Namco chip "02" at
location 4H on video board - replaced - video is good again.
Board is ready to run for the 3-day burn-in, for try #2
Board set runs fine for about 2 days, and starts resetting at random -
found a failed 74LS367 chip at location 1M - replaced, board runs fine
again.
Board is ready to run for the 3-day burn-in, for try #3
This time, the board runs for 3 days, and all is still OK.
As he put it, "sometimes it's a simple fix, sometimes not". That, and he's got about 10 more in the shop. Busy guy.
And I have a few to fix to working status before I start over again, going over the detailis and cleaning up/fixing cosmetics.
The Gravitar just needs a back door and fixing the back corner base that's kinda shredded/rotted.. um, besides fixing the vector chassis.
The Asteroids Deluxe- well, let's just say it's been converted into jamma oblivion as well as the panels glued over the original art.
The Centipede.. well, that's the first one I got and that's been an effort to get to something resembling original.
And that doesn't include the cocktail that needs custom controll panels due to a Trivia Whiz conversion. Not easy fitting controls
to Galaxian panels with 5 extra holes.. But that's all reversible once I end up with the proper parts.