Before removing the processor board, check the following areas:
- Use input test 11 & 12 to verify problems
- Check for any obstruction in the ABC optics
- If the diverter paddle moves slowly, then clean and repair it
- Unplug the 10-pin plug at J/P 5O, to measure pins 1, 3, & 4 for 8 VDC and Vb at pin 8 (ground lead on chassis)
- Check pin 7 for ground (green wire)
- If the voltage is good, replace ABC optics
- If the voltage is missing, then check harness wiring and plugs
If that doesn’t work, try the following steps:
- Change the ABC optics, and test
- Replace the processor board, and test
- If the processor board seems bad, check eBay for replacement or repair service
- If the processor board is good, then replace the motherboard
- To repair the motherboard, use this diagram below to isolate the bad trace
- If the processor board and motherboard is good, then go to the machine and check the wire continuity using the wiring diagram provided on this page
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