What a marathon. Did you ever get it running? I have a 2200 with blown left outputs, but no other signs of damage. I am hoping I can get it figured out. I do plan on a complete recap very soon once I figure out whether it will run or not. Do you know if I remove the PS cable from the left channel board, will the remainder power up if it is OK?
Thanks,
Mark
Thanks,
Mark
remove the cable from the left channel and see if the amp fires up and protection disengages.
Make sure you drain the main power caps before reinserting the power cable
Make sure you drain the main power caps before reinserting the power cable
Thanks for the reply! That is my course of action. Physically everything in this amp looks ok, but the outputs are shorted. I am in the process of checking backwards in the print to make sure everything else measures OK. Would you happen to know how to check the two adjustments on the board, once I do get it running? I will be using a DIM bulb setup to bring it back up.
Thanks,
Mark
Thanks,
Mark
the manual is on HiFi engine, the two adjustments are for bias (7.5mv) measure on the two vertical pins and DC measured on the speaker terminals (0mv)
shorted outputs can often take out drivers and diodes and zeners
shorted outputs can often take out drivers and diodes and zeners
So far, all outputs are shorted, and two of the transistors directly upstream are as well. All other devices are looking OK, but I will reserve judgement until I replace the popped parts and compare measurements to the opposite side.
Thanks again,
Mark
Thanks again,
Mark
check the resistors and caps around the shorted transistors and the emitter resistors as well- good luck!