Bottlehead Forum
Bottlehead Kits => BeePre => BeeQuiet attenuator => Topic started by: cacofonix on December 26, 2023, 01:38:24 PM
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Hi
When performing the voltage checks after assembling the C4S board I get the following readings
1=151.3
11=151
6=124.1
16=148.1
I've traced through the manual steps and re-flowed the chassis connections but it hasn't addressed the high voltage on 16
Any thoughts on what might be wrong and what I could do to diagnose and rectify?
Thanks
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I took a few more photos including of under the board, and the side with the voltage issue
Maybe it will help find the culprit
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Looks like you have D1 on B side of C4S board reversed.
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doh!
You're right @Kris - thanks for catching that.
I didn't see it even after looking at many times.
I can't wait to fix that mistake (but also scared of trying to remove and solder that diode with clipped leads)
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but also scared of trying to remove and solder that diode with clipped leads
Yeah, I wouldn't even try to reuse that LED. They are too fragile and most likely will not survive that amount heat.
Just contact Bottlehead and order replacement.
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I would also suggest a lot more heat and some more solder on the Q2 transistors and the R2 resistors on that board.
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Yeah, I wouldn't even try to reuse that LED. They are too fragile and most likely will not survive that amount heat.
Just contact Bottlehead and order replacement.
Thanks Kris. I ordered a pack of replacements
I would also suggest a lot more heat and some more solder on the Q2 transistors and the R2 resistors on that board.
Thanks Paul
I was definitely tentative with the heat and the solder on the board thinking that my ham-fistedness would either damage a component or I'd create a solder bridge or something. I will apply more solder to those and turn the heat up on my soldering iron
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You will really need your iron set at max heat to get a proper solder joint on the center leg of the MJE5731A transistors, as that is connected directly to the metal tab which is on a big heatsink.
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Just wanted to follow up and not leave this thread hanging.
I got my replacement leds and made the fix that Kris caught.
I also applied more heat and solder to the connections as Paul suggested.
My BeePre2 passed all voltage checks and is fully operational.
Thank you for your help