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We continue repairing our very broken HP 5245L, and hit some really subtle bugs in this amazing all-transistor machine. Opening the Nixie decoder to reveal its many neons and photo-resistor tree is a special treat.
5245L Repair-a-thon Playlist: • HP 5245L Repair-a-thon
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00:00 Summary of previous episode
01:16 Board A21 gate signal repair
04:10 Why is it still not counting?
06:31 Board A17 fast counter repair
11:19 Still not counting right
12:28 Board A15 counter/display explanation
14:20 Taking apart the Nixie decoder
16:25 Board A15 counter neon bulb debug
19:22 Reset issue discovery
20:48 Nixie decoder reassembly and test
21:56 Board A23 reset debug
23:39 Reset fault cured
25:48 Repaired!