Arcade Collecting > Restorations & repair
I don't believe it, another classic added => Centipede ! FINISHED !!!!
Level42:
Mmmmm.....the wire brush worked really well but........
I went to my optician yesterday for my regular eye/lens check. I wear soft (monthly) contact lenses. So when he was checking my eyes, he asked if had travelled by train a lot lately.....
I almost never travel by public transport (company car eh) so I said no and asked why he asked me. He told me there were metal particles in my lenses !!!!!! :o :o :o
I am always very careful with working, power tools, safety etc. but I didn't think the wire brush was much of a risk for the eyes.....so another lesson learned: WEAR PROTECTIVE GLASSES WHEN DOING THIS KIND OF WORK. I felt SO stupid ! Luckely my contacts saved me this time......................
About the cab: Picked up a used Daewoo 51 cm TV two days ago. I made pictures but my card got screwed up in some weird way, so not pictures :banghead:
Anyway, I mounted the CRT in the G07 frame, a perfect fit. The CRT is (as expected) a little darker than the G07. But there's no screen burn, and the picture was very nice when I tried it with a DVD player.
The PCB was a little larger than the G07's but I could fix it in a good way.
The TV survived the conversion. So I got a SCART cable, cut of one connector and soldered all the connections, colors, ground. The sync, +5V and +12V I soldered temporarily to the PCB (will move them to the connectors a bit later).
So, expecting to finaly be able to play the game in full-size, I turned everything on and.......one black screen. I could see a little bit reddish raster, but nothing else.....!?!?!
So I took my test monitor (14" Philips CM8524, I incidently picked up another for €10,- that night as well, will be an excellent monitor for my Pleiads cocktail :) and almost as cheap as a cap-kit :) ) and hooked it up: Perfect Picture !!!!
So I double checked the +12V and +5V lines: OK. The picture was perfect on the Philips so colors, sync and ground are correct as well. I tried selecting sources on the TV (which should NOT be neccesary)....didn't help....
Then I got my DVD player again (which puts out it's signal in RGB) and it works great on the Daewoo !!!
This is VERY VERY VERY weird !!!
The only thing different I can still think of are the RGB levels. These are at about 4V from the PCB and SCART expects 1V. That didn't matter much for the TV I used in my Galaxian, or the Philips test monitor, but maybe the Daewoo has some "overload protection" ?
So I will add some resistors today and report back......please let it work :-\ :-\
Level42:
Just found the TV schematics. Turns out the Daewoo is a Hitachi CP375........and it's built in France :D
Anyway, the RGB inputs are protected with Zener diodes, UZ-5.1BM. AFAIK a zener clamps a (input) voltage to a certain level......I don't remember seeing Zener diodes on the RGB input side of the SCART on the Philips. So this could be the problem.....
shilmover:
--- Quote from: Level42 on December 23, 2007, 04:46:13 am ---Mmmmm.....the wire brush worked really well but........
I went to my optician yesterday for my regular eye/lens check. I wear soft (monthly) contact lenses. So when he was checking my eyes, he asked if had travelled by train a lot lately.....
I almost never travel by public transport (company car eh) so I said no and asked why he asked me. He told me there were metal particles in my lenses !!!!!! :o :o :o
I am always very careful with working, power tools, safety etc. but I didn't think the wire brush was much of a risk for the eyes.....so another lesson learned: WEAR PROTECTIVE GLASSES WHEN DOING THIS KIND OF WORK. I felt SO stupid ! Luckely my contacts saved me this time......................
--- End quote ---
Yeah! I used a wire brush with my Dremel and felt something hit my cheek. thought nothing of it until a couple of hours later, my wife asked me what was sticking out of my face!! It was a 1/2" (just over a 1 cm) piece of wire from the brush! :o
Level42:
Wow, glad that thing didn't end up in your eye !
Back to the Daewoo. This is one big annoying mystery !!!
I've tried the resistors, 75 Ohms in serie with the RGB lines. Still black screen.
So, I figures, let me try that Daewoo on the Galaxian cab: PEFFECT PICTURE !!!!! :dizzy: :dizzy: :dizzy:
I'm going nuts. I can't explain this. Unless the Centipede has very much higher output levels on the video....
So.......gonna try the Philips that I installed in my Galaxian on my Centipede now. If it works, that means it will be swapping time !
Level42:
Ok, Philips works GREAT on Centipede........
:dizzy: :dizzy: :dizzy: :dizzy: :dizzy: :dizzy: :dizzy: :dizzy: :dizzy: :dizzy: :dizzy: :dizzy: :dizzy:
Not going to loose any more time: Centipede is getting the Philips, Galaxian the Daewoo.....everyone happy :D
This means swapping the frames but that's less time than more puzzling.....
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