Help! Mistakes were made...Assembly of Crack Amp Kit [resolved]

zaramon · 3677

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Offline zaramon

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Reply #30 on: October 05, 2022, 05:22:50 AM
Ok, just to make sure I understand the procedure, I'm going to connect one lead to one of the flat prongs on the power cord and touch the other lead to the hot pin and take a resistance measurement and then switch this lead to the other cold pin and take a measurement. Then, repeat the process using the other flat prong on the power cord for a total of 4 measurements? Let me know if I've got anything wrong and I'll try to take some pictures of the results to share.



Offline Paul Birkeland

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Reply #31 on: October 05, 2022, 05:29:34 AM
What I would recommend is clipping one of your meter leads to the ground post on the IEC jack (the third terminal that wires to the chassis plate), then measure AC voltage between there and the N terminal, the little nib that goes to the L connection of the power cord, and the little nib that goes to the fuse holder. 

There may be some other measurements to take beyond that, but that's a good start.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline zaramon

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Reply #32 on: October 05, 2022, 06:56:32 AM
Ok, I added three pictures of measuring AC voltage with one lead on the ground post (E) and the other lead touching post (N) followed by the lead touching post (L). Lastly, the lead touching the little nib that goes to the fuse holder (which gave me a reading finally of around 117V). Does this provide some useful information?



Offline Paul Birkeland

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Reply #33 on: October 05, 2022, 07:33:13 AM
OK, this is getting close to the root of the problem.  Can you now repeat that measurement that gave you 117V but instead of the red probe to the nib, touch it to the bar that connects the incoming L to the fuse holder?

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline zaramon

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Reply #34 on: October 05, 2022, 08:17:53 AM
Can you confirm if the bar that connects the incoming L to the fuse holder is labled as 1 or 2 in this picture or if it is located elsewhere?



Offline Paul Birkeland

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Reply #35 on: October 05, 2022, 08:21:42 AM
1

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline zaramon

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Reply #36 on: October 05, 2022, 08:46:44 AM
That test gives me the same 118V reading.



Offline Paul Birkeland

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Reply #37 on: October 05, 2022, 09:10:38 AM
Now perform this same test with the probe clamped to G but measure the voltage where the black wire attaches to the IEC power entry module.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline zaramon

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Reply #38 on: October 05, 2022, 09:17:43 AM
Where is "G" located? I don't see that letter on my cheat sheet, is that short for "Ground" or something? Maybe if you could mark it on the picture it would be most helpful for me.



Offline Paul Birkeland

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Reply #39 on: October 05, 2022, 09:50:50 AM
Yes, the ground terminal, where one probe has remained clamped for all these tests.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline zaramon

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Reply #40 on: October 05, 2022, 09:56:04 AM
Ok, I measured the voltage between the ground and the black wire connecting to (L) as shown in the picture (I circled it) and got a reading of < 1V.



Offline Paul Birkeland

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Reply #41 on: October 05, 2022, 11:28:24 AM
Your fuse is blown or not installed correctly.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline zaramon

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Reply #42 on: October 05, 2022, 12:32:21 PM
Excellent! I'll start looking at that. Thank you for taking the time to work with me on this. Your time is very much appreciated!



Offline zaramon

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Reply #43 on: October 05, 2022, 01:11:48 PM
Thank you, Paul. The fuse does not have continuity. I couldn't see any breaks through the glass, but obviously it's not making a connection. Thanks again for helping me out!



Offline Paul Birkeland

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Reply #44 on: October 05, 2022, 01:12:17 PM
Do report back when you have a fresh fuse to let us know that all is well.

-PB

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man