Rev 3: Socket #5 not working

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2 months 3 weeks ago #10462 by Ty_Eeberfest
R7?? Did you mean to type "R3" or am I missing something?

Assuming you were referring to R3, here is what I would do next:

Turn off the power.

Read resistance from Pin 1 of OK2 to Pin 6 ("anode 2") of the MEGA. It would be best to probe from the top side of the board, i.e. probes touching the pins of the ICs themselves, not the solder joints where the IC sockets are soldered to the back of the board.

If you read ~1K ohms then I am stumped for the moment. But if you read something approximating an open circuit then you need to find the bad connection. You have basically 4 choices:

1 - Solder joint of MEGA socket Pin 6
2 & 3 - solder joints both ends of R3
4 - Solder joint of OK2 socket Pin 1

Also while you are at it verify that OK2 Pin 2 has continuity to ground.

If those all check out, make sure R3 is not physically broken or something. Also there is a SLIGHT possibility that something is wrong with one of the IC sockets. Probe the IC pin of interest on the front side of the board and probe the solder joint of the corresponding socket pin on the back - confirm continuity.

That's all I can think of for now. Let me know what happens.

Look into it later when the dust is clearing off the crater.

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2 months 3 weeks ago #10463 by rmcrae
Replied by rmcrae on topic Rev 3: Socket #5 not working
Before I get into all of that, we probably need to clarify something.

I definitely meant to type R7, or am I mis-reading the Anode Control schematic for Anode_2

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2 months 3 weeks ago - 2 months 3 weeks ago #10464 by Phil_Mod3
Please compare to the actual layout of your board and also to the most recent schematic.
I think there were some errors in previous versions.
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Last edit: 2 months 3 weeks ago by Phil_Mod3.
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2 months 3 weeks ago #10465 by rmcrae
Replied by rmcrae on topic Rev 3: Socket #5 not working
I am working on a Rev 3 board from 09-Mar- 2017. Do I need to be referencing a different dimensions/components layout and schematic PDF?

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2 months 3 weeks ago - 2 months 3 weeks ago #10466 by Phil_Mod3
You are working on a Modular Nixie Clock Rev3 and not on an All-in-One Rev3.
Maybe that caused the confusion?
Last edit: 2 months 3 weeks ago by Phil_Mod3. Reason: Typo
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2 months 3 weeks ago #10467 by Ty_Eeberfest
Yea, looks like you're using an All-In-One Kit manual, but you have a Modular.

Use this manual: www.nixieclock.biz/Downloads/ModularNixi...uctionManualRev3.pdf

Here is the relevant part:


Look into it later when the dust is clearing off the crater.
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