{"product_id":"williams-system-3-11-data-east-sega-lamp-matrix-harness-tester-rotary-switch-lamp-diagnostic-tool","title":"Williams System 3–11, Data East \u0026 Sega Lamp Matrix Harness Tester — Rotary Switch Lamp Diagnostic Tool","description":"\u003cp\u003eA lamp that won't light on your playfield could be the bulb, the socket, the matrix wiring, or the driver board — and you can't tell which without pulling things apart or chasing continuity with a meter. This Lamp Matrix Harness Tester plugs directly into the playfield's lamp matrix harness and lets you power any single row\/column position on demand: dial in a Row and a Column with the two 8-position rotary switches, and that one lamp lights up if the matrix wiring and socket are good — independent of the driver board entirely.\u003c\/p\u003e\n\u003cp\u003eLike the rest of our harness-tester line (Switch Matrix and Coil\/Flasher), it works just as well on a playfield that's off the cabinet — on a restoration rotisserie, say — as it does fully installed.\u003c\/p\u003e\n\u003cp\u003eAccepts a wide 9–25V DC input (9V battery, 12V adapter, or anything in between), so you can power it however's convenient on the bench or in the cabinet.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eHow to use it:\u003c\/strong\u003e\u003c\/p\u003e\n\u003col\u003e\n\u003cli\u003eConnect to the lamp matrix harness headers: J7 (columns) and J6 (rows) on Williams, CN7 and CN6 on Data East. Note the pins are labeled as the connector actually numbers them — Rows 1, 2, 3, 5, 6, 7, 8, 9 and Columns 7-1 through 7-4, 7-6 through 7-9 — so a missing \"Row 4\" or \"7-5\" on the silkscreen is correct, not an error.\u003c\/li\u003e\n\u003cli\u003ePower the board via a 9V battery or a 12V adapter.\u003c\/li\u003e\n\u003cli\u003eSet the Row and Column rotary switches to the position you want to test.\u003c\/li\u003e\n\u003cli\u003eThe corresponding lamp should light; if it doesn't, the fault is in that lamp, its socket, or the harness between the tester and the lamp — not the driver board.\u003c\/li\u003e\n\u003c\/ol\u003e\n\u003cp\u003e\u003cstrong\u003eCompatible with:\u003c\/strong\u003e Williams System 3, 4, 6, 7, 9, and 11 (11A, 11B, 11C) — Williams never produced a System 5, 8, or 10; Data East; Sega.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCompletes the harness-tester set\u003c\/strong\u003e alongside our \u003ca href=\"https:\/\/thatoldpinball.com\/products\/williams-system-3-11-data-east-switch-matrix-harness-tester\" title=\"Switch Matrix Harness Tester\"\u003eSwitch Matrix Harness Tester\u003c\/a\u003e and\u003ca href=\"https:\/\/thatoldpinball.com\/products\/williams-system-3-11-coil-flasher-harness-tester-coming-soon-williams-data-east-sega\" title=\"Coil \/ Flasher Harness Tester\"\u003e Coil \/ Flasher Harness Tester.\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eNot to be confused with our older \u003ca href=\"https:\/\/thatoldpinball.com\/products\/lampmatrixboard\" title=\"Lamp Matrix Test board\"\u003eLamp Matrix Test board\u003c\/a\u003e, which simulates the lamp matrix to test the CPU\/Driver board from the MPU side — this tester checks the playfield's lamp wiring and sockets directly, independent of the driver board.\u003c\/p\u003e\n\u003cp\u003eSee it in action: \u003ca href=\"https:\/\/youtu.be\/cNi8HlfSx7I\"\u003ehttps:\/\/youtu.be\/cNi8HlfSx7I\u003c\/a\u003e\u003c\/p\u003e","brand":"That Old Pinball","offers":[{"title":"Default Title","offer_id":68164024697128,"sku":"LMT-SYS311","price":40.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0861\/0037\/7896\/files\/LMDB1.jpg?v=1794445512","url":"https:\/\/thatoldpinball.com\/products\/williams-system-3-11-data-east-sega-lamp-matrix-harness-tester-rotary-switch-lamp-diagnostic-tool","provider":"That Old Pinball","version":"1.0","type":"link"}