Friday, October 5, 2012

ARP 2600 Repair: Blown Tantalum CAPACITOR, dead 15v rail!

This nice instrument came to me completely dead. One of the trimmers on the PS board was cracked... but even when replaced one of the rails (-15v) was dead.
The 2600 is actually fairly easy to troubleshoot...the issue boiled down to a shorted tantalum capacitor, visible in the second photo.
Tantalum caps are easily burnt out... I am not sure if the broken trimmer caused a spike which burnt out the capacitor, or if the shorted cap caused the trimmer to heat up and crack.

The burnt out cap is shown below.

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