crown ce 2000 with no output and no fault LEDs, Power and signal LEDs present. Repair suggestions.

Thread Starter

nicoro

Joined Dec 2, 2016
5
Hello:
I have a Crown UT2020 = CE2000 that has no output on both channels but no fault LEDS on, amp cycles to turn on power LED and with signal applied signal LED turn on and blinks. Actually on channel 2 can barely hear some output not affected by volume pot. Board PWA 137557-3. Date of production 0055=5 of 2005? Any suggestions on repair.

Thanks in advance

Nicolas
 

Thread Starter

nicoro

Joined Dec 2, 2016
5
Finally obtained the correct schematic for board PWA 137557-3 from bmamps.com...look under TECH tremendous listing of schematics there...look for Crown CE2000A. So started to look at the amp no obvious external or internal damage. Got the cover off and turned it on. It cycles normally without fault lights but after a while the heat sink for output transistors Q114 to Q119 heated up and current could be felt on touching it. Full output voltage of 91 VDC was measured between that heat sink and chassis! No voltage to chassis from the other heat sinks Yet no output from both channels. Will pull out main board and continue.
 
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