Adventures of Rocky and Bullwinkle and Friends, The
Data East, 1993You're currently viewing posts by Pinsider Sliderpoint.
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Well, if you have worked backwards from the coil to the logic board and replaced the transistors and resistors in the circuit, next in line would be an IC chip. I had a similar issue with a slingshot coil, replaced the IC chip and problem was solved.
-Mike
That is a good question. I was not actually able to figure that out myself, the two 7402's share traces which lead to my confusion, so I bought two just in case. I can't remember exactly where I found the instructions on testing an IC chip with a multimeter (maybe someone has a link?) but I started with that process and found the the upper one not testing 100% accurate. So I replaced that one first. It solved my issue with the slingshot coil.
I would just verify you have tested the transistors, diode and resistors on the Q13 circuit at the CN19 connector on the CPU board. If they are good/have been replaced. Then I'd move on to the two 7402's.
-Mike
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Spokane Valley, WA