Arcade Collecting > Pinball
Playmatic Chance MPU Problem
DarkSide:
--- Quote from: pinballjim on September 03, 2011, 12:28:07 am ---I know this is kinda Pinball Repair 101... but....
First - check your voltages.
See if it'll boot up without anything hooked up to the MPU besides the power supply.
Then, with the power off, plug something back in, and turn the power back on. See if you can identify something dragging your power down or sending a shorted connection to the MPU. In my experience, it's been displays, driver board, or a playfield connector.
I've owned ~40 machines and never once had a bad ROM unless the legs were physically falling off the chip.
--- End quote ---
Well i need Pinball repair 101, this is my first machine :)
Problem is the power for the mpu board is coming from the decoder board, did try without anything connected, and the machine does finish the boot up sequence, or atleast thats what it looks like.
The display on the front counts to 7, and then goes to 0, and thats when the flashing lights turns on, or more right it was when they did work, right now the machine turns on, counts to 7, goes to 0, and nothing more happens, something burned out is my guess.
Test mode still works, or sorta works, it gets stuck at test 1.
DarkSide:
Okay, could not sleep so made a few tests.
Manual says check voltage on memories rom, thats spot on at 10.7 volt, check pin 3 on the cpu with the test light, also okay, checked ic 23, pin 10 and 11, manual says 2 volts, im getting 5.
But the manual makes little to no sense at all, pretty bad english :(
Edit: Good news is the flashing lights are back and working, there is a lot of bad connections in that machine.
DarkSide:
Those old pinball machines can sure take up a lot of time.
Was probing around on the board today and found a dead SC158 transistor, i think it can be replaced with a BC158, will need to order a bunch of parts.
DarkSide:
Parts are finally ordered, i just hope that i got the right replacements for those transistors.
DarkSide:
Not sure if anybody is reading, but will still post my progress.
The machine now coins up, and its possible to start at game, half of the playfield is dead, but the flippers work, and the bumpers in the bottom, there is a few broken wires i need to resolder, and a bad connection to a relay, but its progress. ! :)
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