Arcade Collecting > Restorations & repair
TheShanMan's Defender restoration - New repro wiring harnesses!!!
TheShanMan:
Cool! I don't know how many you have, but unless you are low enough that you might run out, I'll wait until I can get my existing mech cleaned up and tested before I buy, so I know if I need 1 or 2.
I don't know if my mech is token or quarter, but I actually would want to convert to tokens. Can these be converted or would I have to buy other mechs? I checked the "convert coin mechs to tokens" thread and I don't think these mechs are there.
RetroACTIVE:
HOLY CRAP! This board is full of problems... :banghead:
The good news is that it now starts up... rug pattern is there... and it goes into the attract mode (at least you can tell by the smattering of pixels)... but it still is not completely up yet!
The bad 374s were the remaining problem holding up the start up sequence and keeping all 4 status leds on on the ROM board... :applaud:
Now I believe its the 165's (video shift register circuitry) that is screwing up the works....
This is with out a doubt the most messed up board I've dealt with in a while... its not obvious like massive corrosion or physical damage.. or typical easy failures... but many many parts are faulty on this bad boy...
... almost there
:cheers:
TheShanMan:
Oh my gosh. I would have been way over my head if I had persisted in trying to fix it myself! You're a God-send, Retro!
RetroACTIVE:
Well ALRIGHTY THEN! Its done!
- All inputs and sounds check out.
- CMOS passes CMOS test... (I've not yet put the battery in and saved a high score... )
- The last thing was the 74LS139 (1 of 4 decoder)... keep an eye out for failures where it looks like the rug pattern twinkles and the attract screen has very little data on it (I could barely see the bottom of the Defender text flashing)... this behavior is indicitive of the 139 failure.
I will put the battery in and see if it retains scores\coinage... I think it will be ok... I'm feeling good now!
I will run a full blown burn in (24 hrs) with entire ROM set before I say good to go back to TheShanMan!
TheShanMan:
I am very excited! I'm sure you'll be happy to be rid of it - you probably would have never guessed that you'd be in for all of this when you expressed willingness to work on it. I assume you don't have a tracking # for the 2 replacement roms, but I guess we should cross our fingers for them to arrive by the weekend. It would be too cool if I actually get to start playing 2 weekends from now!
I hate to keep saying this over and over, but thank you so much!!! :notworthy: I hope it won't be long before my abilities will be good enough that I can give back to the community in a similar way.
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