(Topic ID: 227467)

F-14 Switch Matrix Help - Fixed again...I hope

By GLSP3022

5 years ago


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  • 18 posts
  • 4 Pinsiders participating
  • Latest reply 5 years ago by GLSP3022
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#4 5 years ago

First thing to check with J-8 and J-10 removed and power on, all pins (except the key pin) of J-10 should be high if using a probe or close to 5 volts if using a DMM. Then check with a probe all pins of J-8, they should be high with a low pulse.

Have you been working around the flippers with the power on? Could you have shorted the EOS switch to the lane change switch?

#14 5 years ago
Quoted from GLSP3022:

Not sure if U30 and U39 got toasted again or not.

Did you ever test the chips? The burn marks on SR-11 and SR-10 shows that the EOS switches have been shorted or are still shorting to the lane change switches. If you are smoking the Nand chips then the resistor packs are not the cause but an effect.

#17 5 years ago
Quoted from GLSP3022:

i am half tempted to follow your advice and check the last set of chips to see if they are indeed bad or if it was the resistor packs.

Even if the resistor packs were bad, there would not have been any damage to the chips. There only would have been crazy switch matrix issues.

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