The A/C relay clicks in the A/C select test but the C side reports an error; at start-up the relay clicks on and off over and over, and none of the coils on the 25 V circuit fire. The fault follows the aux power board into another game.
A/C relay C-side error, dead 25 V coils: burnt zero-ohm jumper W6 on aux board
Cause: The zero-ohm jumper W6 on the aux power board (in the 25 V feed through the relay) had burnt open. It still passed voltage with no load but collapsed as soon as the coils were connected. The game detects the C side through an opto on the interconnect board fed by the same 25 V, so the missing voltage also shows as the C-side error.
Checks
- Put the game in the A/C relay test with the relay on the C side and measure J11-1: about 25-38 V unloaded is normal.
- Plug J11 back in and measure again; if the voltage falls to a few volts, the feed is open on the board side.
- Measure along the 25 V path from the bridge rectifier through the relay; look for a scorched zero-ohm jumper (W6).
Fix
- Bridge W6 with a jumper wire (or a clip lead to test first) and confirm the C-side coils fire and the error clears.
- Then fit a permanent wire link in place of W6.
Games
Related tips
Source: Pinball Repair help group!! (Facebook group)