(Topic ID: 214384)

Tales From the Crypt left slingshot won't fire

By swirvin

5 years ago



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  • 8 posts
  • 3 Pinsiders participating
  • Latest reply 5 years ago by swirvin
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#6 5 years ago
Quoted from swirvin:

The left slingshot on my TFTC will not fire in game play or test.The coil is good and will fire when the collector is grounded...

Are you grounding the Tip122 collector or the pre-drive transistor collector or ? If it works grounding the pre-drive collector, then I would go back to the logic signals. Have you checked the logic levels with a scope or logic probe starting with the PIA while in Diagnostics->Coil Test? Is the PIA socketed?

#7 5 years ago
Quoted from classicgamefan:

Are you grounding the Tip122 collector or the pre-drive transistor collector or ? If it works grounding the pre-drive collector, then I would go back to the logic signals. Have you checked the logic levels with a scope or logic probe starting with the PIA while in Diagnostics->Coil Test? Is the PIA socketed?

I know you've run this down already, but just a quick double-check: By my reading of the schematics, the PIA output driving the left sling is 11D pin 39 going to the 7407 at 11D pin 5 with output on pin 6 then through the resistor array going to the 7402 at 12A input pin 2 output pin 1 then to Q4 then to Q10.

I think it would be uncommon for it to go bad, but one thing you didn't mention is checking continuity across the 4700 ohm resistor in the resistor array.

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