Interconnect board from another game fitted: the values Jokerz needs

System 11 interconnect boards were built with game-specific resistors and jumpers for the flasher circuits, and a board from another title (here one set up for Riverboat Gambler) can make flashers far too bright. For Jokerz, R13 is 1.5K ohm and R14 and R15 are 3.3K ohm (5 W, 10%), with jumpers W1 to W12 fitted. After correcting the board in this game, several flasher drive transistors, a gate chip and pre-drivers that had been damaged had to be replaced before the flashers all worked.

Systems

• Williams System 11C

Games

• Jokerz!

Related tips

• The interconnect board (Banzai Run and later)
• Roulette wheel not working: worn J15 connector on the interconnect board
• GI out on Banzai Run and later: burnt interconnect connector 2J6
• Right flipper dead after a coil cooked: burnt trace on the interconnect board
• No drop target switches register: 12 V feed lost at a loose connector
• Repairing a burnt GI connector properly
• Lane change not working on Taxi and later System 11 games
• Interconnect board and flipper power board fuses

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