Resistance check Terminal 22

[gbennn]

Hello there,

So I finally finished building my crack but I didn't pass the resistance check. Everything looks alright but the Terminal 22, I'm still writing all value just in case:

1. *
2. *
3. 1.3 Ohm
4. *
5. *
6. 1.3 Ohm
7. 2.93 KOhm
8. 1.3 Ohm
9. 2.94 KOhm
10. 1.3 Ohm
12. 1.3 Ohm
13. *
14. 1.3 Ohm
20. 1.3 Ohm
22.  NOTHING (like infinity resistancy, the meter displays the same thing as if nothing touches)
B3. 2.93 KOhm
B6. 2.92 KOhm
RCA Red Centrer Pin : 108.2 KOhm
RCA Black Center Pin: 103.7 KOhm
RCA Red Ground: 1.3 Ohm
RCA Black Ground: 1.3 Ohm

I saw similar questions about this terminal on other topics but I don't understand how the managed to get rid of that. And since nothing is connected on this terminal I just don't understand why I should get a 0 Ohm.

Some more informations:
- Ground seems ok, if I mesure between ground lug and T 22 I have 1.3 Ohm.
- I paint the transformer bell but ONLY the outside;
- I follow instructions from the Crack 1-1 Manual 09-20-16
- I wired the transformer for the "greater than 235V AC and less than 245V AC" voltage
- I wanted to add pictures of the build but for some reason I'm not allowed to post external links here (prob cause first post)

I would appreciate a little help, I can't wait to try it with my 650, they've been underpowered for faaaar too long.
Thanks;

[Paul Birkeland]

- Ground seems ok, if I mesure between ground lug and T 22 I have 1.3 Ohm.

The resistance checks are checking between ground and the terminals listed.  If you measure 1.3 Ohms between the ground lug at the IEC power entry module and terminal 22, then you have an inconsistency in your measurements that suggests a loose connection or improper measuring.

This is most commonly an issue with the junction where the black wires meet at the headphone jack, as this joint is often soldered incompletely and there's one loose wire in the bunch.

[gbennn]

A little update to keep you informed:
I tripled check everything last night focusing on the headphone jack, but it was quite clean.
So as you told me it might be a ground issue, I inspected it in detail.

Eventually I found what was the issue, the ground was indeed messed up.
At the safety ground lug there are a black wire connection and the bare buss wire going through. The solder was bad. There was solder all around the buss wire but not on it; it was really difficult to see it. Even with good eyes you need a bright light and a magnifying glass.
I re-heat the thing and that was it! It's impressive how a little and almost invisible mistake can affct the whole thing.

I passed the resistance check and voltage check and not there is actual sound coming out of it, that's really rewarding!

Just a last question: when I did the voltage check on 7. there was a spark and a little cracking noise, no smoke no weird smell.
Since this place is a bit hard to reach with the alligator clip I think it was just an electric arc when I was trying to attach the clip for measurement. I did it once again a moment later and nothing happend, the whole voltage check was good.
Can you please tell me if it's sound ok or if this spark is something I should worry about?
I don't have a lot of experience in electronic and I don't want to use an equipmeent that isn't safe.

Thanks.

[Paul Birkeland]

It sounds like you might have briefly touched 6 or 9 along with 7.

When doing voltage checks, you want to use an alligator clip to secure the ground connection, then you can just use the meter probe to touch the hot terminals.