Crack works well! After upgraded speedball smoke [resolved]

paulusho · 1808

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Offline paulusho

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on: September 14, 2015, 03:58:22 PM
I received my Bottlehead Crack DIY kit and has no problem to put it together and loved it. But after I upgraded the speedball on the Crack and power on the AMP, I found out there is some smoke coming from a capacitor located at Terminal 14 - 15. May I ask how can I trouble shoot this issue. Any help is deeply appreciated.
« Last Edit: October 02, 2015, 10:07:30 AM by Caucasian Blackplate »


Offline fullheadofnothing

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Reply #1 on: September 14, 2015, 04:55:16 PM
Check the mounting of the TIP-50 transistors to the heatsinks.

Joshua Harris

I Write the Manuals That Make The Whole World Sing
Kit Packer Emeritus

Offline paulusho

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Reply #2 on: September 15, 2015, 09:02:00 AM
To: fullheadofnothing

WoW! You are really AWESOME!
I checked the mounting of the TIP-50 transistors to the heatsinks to confirm that I didn't slip the "FIBER WASHER" onto the bolt to cause a short (One of the "O" grounded on the large PC board) between the TIP-50 and heatsink.
After I followed the instruction to mount the transistor to the heatsink.
ISSUE GONE!
Previously, I slipped a metal washer (Came with the package) instead the fiber washer onto the bolt.   >:( >:( >:(

The Crack is running for 4 hours with the speedball and I didn't experience any issue.
:-)
 
One more question. Do I need to worry about the capacitor on T14-T15? Should I replace it or any other components on the Crack or speedball?
Because there was some smoke came from that capacitor.

BTW, I completed the resistance check and voltage check to confirm that all the values at terminals were good.


Offline paulusho

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Reply #3 on: September 15, 2015, 11:48:25 AM
Seeing new issue after the AMP ran another few hours.
I heard the left channel has humming noise when I set the volume to 25%. The right channel is working fine...
Is that related to the capacitor located at T14-T15???
Should I replace it or I need to perform more test to determine the issue?
Thanks again for any help and kind attention to this matter!


Offline Paul Birkeland

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Reply #4 on: September 16, 2015, 08:00:32 AM
It wasn't the capacitor that was smoking, it was one of the 270 Ohm resistors.

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man

Offline paulusho

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Reply #5 on: September 16, 2015, 01:47:19 PM
Hi Paul,

Thanks a lot for your advise.
I will replace both of the 270 ohm resistors to test it again and share my result with you ASAP!
 8) :D ;D ;) :)


Offline paulusho

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Reply #6 on: October 02, 2015, 09:18:44 AM
I replaced both of the 270 ohm resistors and the capacitor located at T14-T15.
After that the CRACK worked well with my HD650 for the passed two days.
No humming noise from the left channel.
Another HAPPY CRACK builder/owner. ::) ;D :D ;) :)


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