Williams System 3–11 & Data East Switch Matrix Harness Tester

Description:

Track down a bad switch, a miswired harness, or a bent playfield contact on your pinball's switch matrix in seconds — no schematic, no multimeter, no guesswork. Plug this tester into the switch matrix harness (J10 for rows / J8 for columns on Williams, CN10/CN8 on Data East) in place of the MPU or driver board, and closing any playfield switch lights up the matching Row and Column LED. A printed matrix silkscreened right on the board (switches 1–64, laid out by row and column) lets you read off exactly which switch number just closed, instantly.

Unlike testers that plug into the MPU or driver board, this one tests the playfield itself — which means it works just as well with the playfield completely out of the cabinet. That's especially useful during a restoration: mount the playfield on a rotisserie, plug this in, and troubleshoot every switch while everything is still easily reachable, with no cabinet in the way and no driver board connected at all.

Fully passive — powered by a 9V battery (not included), nothing to configure, nothing to charge. Press a switch, read the LEDs, move on.

How to use it:

1. Disconnect the switch matrix harness (J10/J8 on Williams, CN10/CN8 on Data East) from the MPU or driver board.
2. Plug the Switch Matrix Harness Tester onto those same headers — works whether the playfield is in the cabinet or off it entirely.
3. Close a switch on the playfield (by hand, or by tilting/activating it normally). The matching Row and Column LEDs light up.
4. Cross-reference the lit Row/Column against the printed switch-number matrix on the board to identify exactly which switch (1–64) just closed.

Compatible with: Williams System 3, 4, 6, 7, 9, and 11 (Williams never produced a System 5, 8, or 10 — despite what the numbering might suggest); Data East

See it in action:  https://youtu.be/NmYAcus2Frs

SKU:  TBD