Luxemburg, WI
I think it was a combo of the display eeprom, nvram, and factory reset
(Topic ID: 255840)
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Data East, 1991
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Try pulling out the ribbon cable a bit at the MPU to see if the ribbon cable makes better connection that way. If that doesn't work, try the same thing at the DMD ribbon cable connection. Maybe there is some corrosion on the board pins.
Quoted from V8haha:Also noticed one of my batteries is starting to go bad need to swap them out.
Quoted from PinballManiac40:Consider going NVRAM to rid of those batteries forever. 124 year retention rate.
https://www.pinitech.com/products/6264_nvram.php
Can you measure the voltages at the DMD power connector? Up till now, seems to have been a data issue.
So all your animations are working now you are saying?
Quoted from joelw23:fixed the skill shot issue, it was just a switch adjustment....
Shooter lane switch?
Quoted from joelw23:still not getting the race again/ball save to light up and work when you start a game...
Does it light up if you go into the lamp test? No others are out?
Swapped in a working bulb from another location? Lamp socket missing the diode or the solder tabs touching?
the "race again" lights up in the lamp test.. the lights twist in to a pcb board.
I'm just assuming "race again" is the ball save function....
it works sometimes, but was playing and it came on at the end of a long played ball...doesn't seem right.
My power supply is also not being used along with my DMD as the playfield is all torn apart. I would want to see about recapping the power supply though if I was to send it on your way.
As another mentioned, capacitors would be a huge benefit to keeping the game running. There are a couple of the smaller ones that do like to leak and eventually would cause loss of 5volts. Currently, I think you voltages at the DMD seem like they are in spec.
With power off, Can you paritally unplug the ribbon cable at the DMD and at the MPU board? If it helps, then I would scrub the male board pins with a clean toothbrush and alcohol.
could be.....
i just ordered a bridge rectifier to replace BR1...seemed to test bad.
was reading another thread and saw this......
"We are having issues with the dmd resetting during gameplay too. After installing a new LED display, a new DMD display rom, new ribbon cables, and a new power supply the dmd still resets randomly during gameplay and/or during the Star Trek preview, except it still keeps score.
From Clay's Repair Guide: This problem occurs because the +12 volts needed for the dot matrix display is generated by the 18 volt lamp matrix bridge and the capacitor / fuse bolted inside the back box (through connector CN5 on the power supply). The 12 volts generated by the power supply board (for the sound board which comes from connector CN6), does not provide this voltage to the dot matrix display. Hence, the power supply could be working perfectly, and this problem could still exist.
This sounds and looks exactly like what is happening. We have looked at this in Clay's Repair Guide and are doing all the reset suggestions, (i.e. replace diodes, bridge rectifiers, etc....)"
Does CN1 on the power supply have any discoloration on the white plastic housing at all? That will be a sign of burnt pins. I think the 100v for the display power comes in at the top corners of this 3x4 connector. May want to just reseat the connector even if it seems ok.
How does the CN1 look on the power supply? Is there discoloration around that pin? If so, that is an issue that needs to be checked as to whether that goes to the 100v on the schematic. Which pin is this one? I can't tell by the orientation of CN1 in your hand.
Post #80 you show the discoloration from the burnt pin that will get worse over time. So I am wondering if you remember when the animations got better at that time, do you remember reseating CN1 along the other things you mentioned?
Here are a list of parts to redo the wiring and male pins. The male pins are a challenge to get out of the board sometimes. Normally I see both mating ends of the CN1 damaged, not just one end.
https://www.marcospecialties.com/pinball-parts/CKWMS
2019-12-12 16_42_03-Data east checkpoint dmd_reset issues _ Tech_ Modern games _ Pinside.com - Inter (resized).png
Odd. I have been expecting a data issue. The flipper coil voltage is not even going to the DMD controller board at all so I don't see how the animations are being affected.
Do you have the two ground straps connected from the bottom of the backtox to the speaker panel? One of them should at least be connected to the ground of the DMD, possibly via from a speaker panel ground on one of the speakers.
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