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teetdogs
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« on: February 03, 2015, 11:03:58 pm » |
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Just picked this gem up but it has one slight issue. Some of the graphics are super blocky. The board has been tested with no problems. I'm thinking possibly power supply issue. It's got the original power supply but it's been rebuilt. Any thoughts?  |
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iankellogg
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« Reply #1 on: February 04, 2015, 08:16:39 am » |
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As stated in the shoutbox, try turning the service switch on that is inside the coindoor. That will put it in selftest mode and should report any rom or ram errors. I am somewhat expecting a ram error on the video board but if that isn't the case there might be some mux error or something on the output circuit.
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teetdogs
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« Reply #2 on: February 04, 2015, 09:29:41 am » |
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I did go and put the system in test mode, and no RAM error.. The guy I bought it from had sent the board off to be checked and repaired. The guy he sent it to was able to run the board just fine in his cab which is why I was suspecting a power supply issue.
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iankellogg
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« Reply #3 on: February 04, 2015, 10:13:08 am » |
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My only other guess is going to be an issue with the monitor adjustment.
Either way you should check the voltages on the PCB. you can use a test point for that, they are all over the boards. 4.4V to 5.5V would be fine for a voltage check.
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teetdogs
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« Reply #4 on: February 04, 2015, 10:51:11 am » |
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Just gotta figure out where the voltages come out of the power supply. I did notice a burnt resistor but it's in the audio board however the audio is perfect.
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iankellogg
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« Reply #5 on: February 04, 2015, 10:54:16 am » |
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the audio board is the power board. check the voltages on the PCB. There are labeled +5v and GND test points on both the video board and CPU board.
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VertexGuy
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« Reply #6 on: February 04, 2015, 08:55:21 pm » |
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Just gotta figure out where the voltages come out of the power supply. I did notice a burnt resistor but it's in the audio board however the audio is perfect.
an ARII can work and still fuck up. |
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teetdogs
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« Reply #7 on: February 04, 2015, 09:12:04 pm » |
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My thinking is a new ARII board, this one seems pretty much shot.
Anyone know where one for sale is?
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John's Arcade
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« Reply #8 on: February 04, 2015, 09:58:14 pm » |
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My thinking is a new ARII board, this one seems pretty much shot.
Anyone know where one for sale is?
Rebuild it. It's not hard. Bob Roberts sells ARII rebuild kits. Pole Position is all about power power power. Good ARIIs and good connections at the boards. I have had blocky graphic/sprites before. I resat chips to fix. Try pushing on all chips and reseating the edge connector too. Inspect that edge connector also. Is it burnt up? |
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VertexGuy
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« Reply #9 on: February 04, 2015, 10:09:02 pm » |
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My thinking is a new ARII board, this one seems pretty much shot.
Anyone know where one for sale is?
I have 4 extra |
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teetdogs
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« Reply #10 on: February 05, 2015, 10:16:37 am » |
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Are they the correct ones for a pole position? If so how much do you want for one?
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teetdogs
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« Reply #11 on: February 05, 2015, 10:20:18 am » |
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My thinking is a new ARII board, this one seems pretty much shot.
Anyone know where one for sale is?
Rebuild it. It's not hard. Bob Roberts sells ARII rebuild kits. Pole Position is all about power power power. Good ARIIs and good connections at the boards. I have had blocky graphic/sprites before. I resat chips to fix. Try pushing on all chips and reseating the edge connector too. Inspect that edge connector also. Is it burnt up? Edge connector is good, and all chips have been reseated. The reason I'm thinking the board is beyond just rebuilding is this:  This actually doesn't do it justice the burn is really really deep and bad. |
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John's Arcade
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« Reply #12 on: February 05, 2015, 10:26:51 am » |
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You can fix that! If the traces are hosed just use jumper wire.
Don't let it discourage you!
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teetdogs
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« Reply #13 on: February 05, 2015, 10:30:10 am » |
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Thanks for the encouragement John! I think 34K might help me with the soldering. Unless Colorado Game Exchange happens to have one on the cheap.
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VertexGuy
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« Reply #14 on: February 05, 2015, 04:27:07 pm » |
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