Arcade Collecting > Pinball
Playmatic Chance MPU Problem
DarkSide:
Hi guys.
Got a few old playmatic pinball machines, and im trying to get at least
one of them working, but so far not much luck.
When turning on the machine the display on the front counts to 7, and
stops, checking the manual says http://edesigns.dk/pins/7.jpg
I did some probing around with my dmm, but nothing seems to stand out.
Any advice ?
Could it be the CD4023BE(34) or maybe the CD4042BE(24) ?
Regards
Ronni
ChadTower:
If the chips are socketed I would start by replacing those. Bad sockets often do that. Next check for cracked solder joints, discontinued traces, and last replace the chips.
TopJimmyCooks:
PBJ: does yours have the hard plastic playfield? If so, how is it? wavy, super fast? just interested and curious.
DarkSide:
--- Quote from: ChadTower on September 02, 2011, 09:25:51 am ---
If the chips are socketed I would start by replacing those. Bad sockets often do that. Next check for cracked solder joints, discontinued traces, and last replace the chips.
--- End quote ---
Unfortunately they are soldered directly to the board, only chips in socket are the Rom and Ram chips.
I did lift the chips out to inspect the sockets and they look good, and connections was checked both the data lines, and all the others, nothing looks broken, or shorted out.
Im not sure if a faulty Rom chip can make that kind of trouble, its very hard finding any information about those machines, and the manual is not for much help.
DarkSide:
Its ALIVE :)
Swapped the decoder board with a spare from another machine, the Chance counted to 7 on the display, and sprung to life :)
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