adcom gfa 545 II doesn't work

Mattyo5 · 13th February 2004, 10:46 PM

Ok, I just had my adcom amplifiers fixed. I sent the boards and the heatsinks w/o ps or case off to be fixed. I seem to be back to square one however..... I'm still getting - 54v on the speaker outputs and -6v on the other output. I'm thinking that I hooked up something poorly, but there are literally only 5 wires to hook up + indicator LED's. per channel. Its not like I haven't built amps and power supplys before. None of the output transistors leads are shorted to ground, and supposedly all the outputs were changed (not cheap). If I take the rail fuses out of the amp, the voltage on the outputs goes away (like I'd expect...but just in case I REALLY wired something wrong...had to check that) any ideas other than completely replace all the transistors again?

-Matthew K. Olson

Nelson Pass · 14th February 2004, 12:39 AM

You don't know that you have any broken transistors.
Find a thread here about checking for blown devices.

13th February 2004, 10:46 PM	#1
Mattyo5 diyAudio Member Join Date: Aug 2002 Location: Farmington, CT	adcom gfa 545 II doesn't work Ok, I just had my adcom amplifiers fixed. I sent the boards and the heatsinks w/o ps or case off to be fixed. I seem to be back to square one however..... I'm still getting - 54v on the speaker outputs and -6v on the other output. I'm thinking that I hooked up something poorly, but there are literally only 5 wires to hook up + indicator LED's. per channel. Its not like I haven't built amps and power supplys before. None of the output transistors leads are shorted to ground, and supposedly all the outputs were changed (not cheap). If I take the rail fuses out of the amp, the voltage on the outputs goes away (like I'd expect...but just in case I REALLY wired something wrong...had to check that) any ideas other than completely replace all the transistors again? -Matthew K. Olson

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14th February 2004, 12:39 AM	#2
Nelson Pass The one and only Join Date: Mar 2001	You don't know that you have any broken transistors. Find a thread here about checking for blown devices.