BugTrap logic comparator repair

parism

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Donor 10 years: 2014-2015, 2017-2021, 2023-2025
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The BugTrap has developed an issue where upon inserting an IC led 6 comes on

BugTrap 10.21.25.jpeg
I quickly tested the 2N5061 thyristor, switch and associated capacitor for the LED pin in circuit and all appeared good. I did find two resistors out of spec;

1761622223453.png
These should be measuring about 850 (lower) and about 1k (higher). Instead they measured 340 and 170 respectively. However, both were correct spec out of circuit.

I took the 2n5061 out and it passed, I then checked the associated LS86 and found two pins floating, pin 11 and 13.

Bad out of circuit
BugTrap 10.21.25.jpeg

Replaced and we are good to go, no more led lighting upon IC insertion.

BugTrap 10.21.25_1.jpeg

Pro tip: remove the top of the ZIF to put the case back together (or take off the case)

BugTrap 10.21.25_2.jpeg
Case back together

BugTrap 10.21.25_3.jpeg

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