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OK- I cleaned and re-seated all socketed chips on main & auxiliary boards. Also resoldered the pins on the edge connectors and confirmed continuity on the interconnect cable- still no audio or video. I did check the voltages at connectors P18 & P20- Terminal 1 of P20 measured -0.17 volts but...

Will do- thanks for the help!

Ok, I set dip switches 7 & 8 on N13 to free play but no effect on the 1P & 2P buttons- they still remain steady on (no blink) and still no audio or video. Voltages check out OK on the main board at the test points. Next, I moved toggle switch behind coin door to the UP position but no change...

Just acquired a Tempest Upright- all lights are working and the red LED's on the main and video boards light, but no video or sound. Can anyone point me in right direction as to what the problem may be? Or know of a repair source in the San Francisco Bay area?