After cleaning and restoration the game will not finish its reset: the score reels and player unit reset, but the Game Over relay pulses with each turn of the reset wheel and the AX reset relay never pulls in. The game also comes up in Game Over.

Game keeps cycling the reset and starts in Game Over: dirty P5A switch and shorted wires

Cause: The endless reset came from a dirty P5A switch; the Game Over problem was a shorted pair of wires going to switches on the 1A and 1B relays.

Checks

• Put all score reels on 1 and try a reset to confirm they reach zero.
• Check every zero-position and reset switch in the reset circuit on the schematic, including the score motor switch stacks.
• Look for chafed or shorted wires on relay switch stacks.

Fix

• Clean and adjust the P5A switch contacts.
• Repair the shorted wires to the 1A and 1B switches.

Parts of an EM game carry line voltage; unplug the game before working near the transformer, line cord and switch.

Systems

• Electro-mechanical

Games

• Royal Flush

Related tips

• Wrong player comes up on ball 2 and scores won't reset: stuck P relay switch
• Start sequence keeps cycling after storage: clean the switch contacts and plungers
• Game resets but the outhole relay never fires: feed wire hanging by a strand
• Game starts but flippers are dead and nothing scores: dirty relay switches
• Game won't start though credits and reels reset: bad joint on the latch coil
• Score motor keeps running at start and the game never starts: clean the ball count unit
• Player 1 'up' lights stay off during play: clean the coin unit contacts
• Won't start a game or reset the score reels: burnt game-over relay coil

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