Problems with Crack

watonwak · 1171

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Offline watonwak

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on: November 17, 2019, 04:30:26 AM
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


Beyerdynamic DT 1990 Pros | Crack + Speedball + Alps Blue Velvet + Panasonic PP Output Caps

Offline Paul Birkeland

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Reply #1 on: November 17, 2019, 05:59:00 AM
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. 

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline watonwak

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Reply #2 on: November 17, 2019, 08:53:20 AM
I haven't checked the fuse yet. I'll have a look and reflow the joints when I get home and report back!

Beyerdynamic DT 1990 Pros | Crack + Speedball + Alps Blue Velvet + Panasonic PP Output Caps

Offline watonwak

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Reply #3 on: November 17, 2019, 09:45:03 AM
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.
« Last Edit: November 17, 2019, 09:47:19 AM by watonwak »

Beyerdynamic DT 1990 Pros | Crack + Speedball + Alps Blue Velvet + Panasonic PP Output Caps

Offline Paul Birkeland

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Reply #4 on: November 17, 2019, 10:02:50 AM
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. 

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline watonwak

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Reply #5 on: November 17, 2019, 10:31:28 AM
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

Beyerdynamic DT 1990 Pros | Crack + Speedball + Alps Blue Velvet + Panasonic PP Output Caps

Offline Paul Birkeland

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Reply #6 on: November 17, 2019, 10:50:28 AM
I would just reheat them all and add a tiny bit more solder. 

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline watonwak

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Reply #7 on: November 17, 2019, 10:57:15 AM
Okay, thanks. I will get on it tomorrow.

Cheers,

Euan

Beyerdynamic DT 1990 Pros | Crack + Speedball + Alps Blue Velvet + Panasonic PP Output Caps

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