Category: Pinball

Pinball Non Volatile Ram

Replacing Ramtron FM16W08SG 28 pin soic replaces 6264 Note FM1808 (256 Kbit) replaces 62256 directly with no jumper changes needed Just to add a note about the clock… there is a jumper on WPC MPUs to allow the RAM to connect directly to the +5V rail so when I install RAM adapters in WPC games […]

WPC GI Dimming

General Illumination (GI): contains five separate strings of up to 18 bulbs per string, with a maximum of 90 bulbs. Each string is controlled by a Triac, which is controlled by the microprocessor. The microprocessor has control of the triaces through through a latch that it uses to store control signals. The GI circuit can […]


Sample patent: Patent tips

Pinball: The Getaway II

2014? Not looked at until 20180221 Right slingshot: broken link, replaced Top flipper sticking replaced coil sleeve & spring Right pop bumper not firing, adjusted leaf switch Main fuse blowing: replaced inrush limitor, spike arrestor, EMI filter (Had to use Jaycar part), note it was the EMI filter that was blowing the fuse! Gone to […]

Pinball: STTNG Star Trek The Next Generation

Bought 2016 sometime Observations: The cleanest best condition machine I’ve ever seen, immaculate under the glass ColorDMD display Power driver board is a Rottendog replacement (full size, all through hole), laid out like original except BR’s are separate diodes.   It seems pretty nice Firmware = LX-7 MCU board: J120 has supplementary PCB: KAHR.US Circuits Looks […]

Williams WPC Power Driver Board

Power Driver Board LM323K WPC-S and Earlier Driver Board: BR1 to C6 & C7 (15,000 mfd @ 25v) to F114: +18 volts used for lamp driver columns. Then the 18 volts goes through voltage regulator Q2 (LM7812) and F115, and is converted to 12 volts (regulated) for the switch matrix. BR2 to C5 (15,000 mfd @ 25v) […]

Pinball: Twilight Zone

Purchased Nov 2017 Initial observations Playfield in great condition Cab in good condition Some GI out Issue: TZ-20180119 Resetting sometimes when both flippers pressed Replaced all Rectifiers & large capacitors Power Driver PCB Observations On removal notice GI socket (cable side) has been replaced and shows signs of heat damage Q64 and upstream Q75 have […]

Pinball Replacing gates

Piano Wire  This is very stiff and durable steel wire. Excellent for forming replacements for ball gates, spinners, and linkages. It is bendable with pliers but will stay as formed. Stands up well to ball impact. Comes in two sizes, the thin is .047″ and the thick is .063″