Hi everybody, i have an issue with my American Pro Concert C4800 power amplifier. Channel 2 burns out the two MUR1560 diodes as soon as i turn it on. I replaced them and replaced as well some burnt out components, but i still can't get it working. Power supply is OK, channel 1 works and sounds good. Channel 2 has some sort of short circuit somewhere. I noticed that output transistors have 24ohms between their pins, is that ok?
I post here the schematic for this amplifier: C4800_Schematic
Thanks in advance!
I post here the schematic for this amplifier: C4800_Schematic
Thanks in advance!
so you think i should replace all output transistors? did i mention that i have 24 ohms between 2sc5200 pins?
If you are reading 24 Ohms between the base/emitter you are probably reading R213/4 which are 20 Ohm resistors.
Craig
Craig
One more thing, i have 7ohm on base-collector for the 2SA1943, is that normal? i don't have it on the other channel, which is working fine. Thanks
All of them, but i just discovered two units of 2SA1943 totally blown (short between pins) and one 2SC5200 as well. I will replace them and try again
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