The centre house ramp opto, a key switch in play, is unreliable. The receiver's red indicator LED only lights when the pair are within about 1.5 inches of each other, but the ramp is about 2 inches wide.

Centre ramp opto unreliable: weak Spike 2 opto pair only works at close range

Cause: A weak opto pair: these small board optos can fail with a weakened beam even with correct voltage.

Checks

• Take the pair out of the ramp and test the range in free air using the receiver's LED on the back of the board.
• Check the supply voltage to both boards.

Fix

• Replace the transmitter and receiver pair; a good pair works over more than 3 inches.

Systems

• Spike 2

Games

• Elvira's House of Horrors (Premium)

Source: Pinball Repair help group!! (Facebook group)