1
Amplifier Discussion / Sun Coliseum Problem
« on: May 01, 2012, 11:10:29 PM »
Hi,
I recently had my coliseum short out so I did a bunch of tests which lead me to a short somewhere in the output section where there is DC voltage being output on the speaker cable.
I found a shorted transistor and a zener diode and replaced both. I also replaced the IC just for good measure. I still get a semi bright light with the light bulb limiter when everything is hooked up and a dim one when the output section is taken out. I've checked all the caps, resistors, diodes, and transistors and can't find anything shorted.
When plugging it into the wall it smoked R47. I haven't touched the bias pot. Any ideas?
I recently had my coliseum short out so I did a bunch of tests which lead me to a short somewhere in the output section where there is DC voltage being output on the speaker cable.
I found a shorted transistor and a zener diode and replaced both. I also replaced the IC just for good measure. I still get a semi bright light with the light bulb limiter when everything is hooked up and a dim one when the output section is taken out. I've checked all the caps, resistors, diodes, and transistors and can't find anything shorted.
When plugging it into the wall it smoked R47. I haven't touched the bias pot. Any ideas?
