Bottlehead Forum
Bottlehead Kits => Crack => Topic started by: watonwak on November 17, 2019, 04:30:26 AM
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Hi,
I just built a Crack as my first electronics project.
It was all going pretty well, passed as resistance and voltage checks, i plugged it in and all was well. That was yesterday.
Today i noticed a slight hum in the right channel that went away temporally if i tapped the top metal plate, but the hum would return after a few mins.
After reading through the forums I decided to re-flow some of the joints, mainly around the volume pot. they all look good now (to me anyway) and i checked the resistances again and all good.
Then I tried to check voltages. I got fluctuating low values on 1 and 2, and when i checked 3 there was a spark and now I can see some black marks on the right side 10W 3K resistor and am reading 0V on terminals 1-10
Any advice would be great.
Euan
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You may have just blown a fuse, have you checked that?
I would reflow all of your joints, not just the ones on the volume pot. I can see a few that look like they could use some more heat.
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I haven't checked the fuse yet. I'll have a look and reflow the joints when I get home and report back!
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So I have checked the fuse and that is not the problem. Any idea why I am not getting any voltage readings now?
I forgot to mention, the 2 LED's and the tubes still light up.
I don't have time tonight to reflow all the joints so I will do that tomorrow evening.
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If the LEDs light up, then your DC voltages are not zero. You may have accidentally set your meter to AC volts for your readings.
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Ah, I was being stupid and my meter was on AC!
All the voltages are now fine!
Are there any joints in the pictures that look okay and what I should be aiming for or any that particularly need reflowing?
Many thanks,
Euan
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I would just reheat them all and add a tiny bit more solder.
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Okay, thanks. I will get on it tomorrow.
Cheers,
Euan