Before removing the processor board, check the following areas:
- Check 24V SA fuse
- Check terminal block to see if #1 wire is seated firmly in place
- Check connector and wire from J/P 145-1 to J/P 7-1
If that doesn’t work, try the following steps:
- Remove motherboard, and test J/P 7-1 to J/P 11-6 and J/P 11-5 to J/P 2-2B
- If D4 stays “open”, replace it (current suppressor 1.65A, RXE110)
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