Repair logs are quick summaries of workshop and on-site repairs. If your machine needs a service, π¬ Contact Us to discuss how we can help!
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A service call on this Star Wars resulted in a few board repairs to get it up and running again! May the fix be with you! π
First issue: game did not appear to be booting. Voltages and fuses were all OK. But there was no display, no playfield lamps... nothing! A check of the LEDs on the CPU board confirmed that the game was, indeed, booting up. It just seemed to be getting stuck.
The problem here was the batteries on the CPU board. Totally flat. And with no battery backup power on a Data East CPU, the game will not finish its boot up sequence unless you open the coin door. Once I opened the door, the boot sequence finished. This took a little while to figure out because normally the display will show an "open the door!" message to indicate this exact scenario... but that doesn't happen when the display is dead too! π€ͺ
Now to fix the display. Voltages going to it were a little odd... the two high voltages are meant to be around ~110 and ~98 volts. On this display, they were both measuring ~98 volts. There should always be a potential of about 12-13 volts between these two rails. Hmm. Looks like a power supply issue, so out it came for closer inspection. There is one main component which controls this voltage potential, a 13v zener diode at D10. I measured it and it was shorted. That will certainly stop it from working correctly! This diode seems to fail a lot when the high voltage components become marginal. So, I rebuilt the whole high voltage section. New resistors, new diodes, new transistors, new caps. Display is nice and bright again. While I was at it, I also abated some corrosion on the power supply from leaking capacitors.
Next, some lamp issues to deal with. Specifically, backbox general illumination lamps not working. This is usually because of a failed connector on the power supply, and indeed it was in this case. Connector was replaced and the terminals were all re-crimped. This helped, but the backbox lamps were still a bit dicey. They flickered on and off sometimes. Further investigation needed!
Lamp power is also distributed to the playfield power board, fused, and then sent out to the rest of the machine. The flickering issue originated here. The original connector on the board had been destroyed, so somebody bypassed it with a larger Molex-style connector soldered to the back of the board. Not necessarily a bad hack, but the pins within the connector were failing, and were not staying in place in the housing. Time to fix this properly. I replaced the header pins on the board, as well as the pins and connector housing. Back to stock, and working as intended!
Couple of minor things to finish up. New rubbers on the slingshots and flippers. Replaced a few burned-out lamps. Gave the machine a check-over, and all seemed fine! I'm no Jedi but I'm pretty good at fixing stuff! π
