Zen Amp Problem

vdi_nenna · 11th February 2004, 03:42 PM

Hi All,

I'm having a problem with my original zen amp. The left channel's output is really low, but not distorted. The right channel is ok. The night before, both channels worked fine.

With just my senses I can see no problems, nothing smells burned, the heat sinks are exibiting equal heat output by touch in both channels. I did hear a POP in the speakers when I turned it on. To be sure nothing else in the chain is the probelm, I hooked up the CD player outs directly to the Zen.

Could it be a blown MosFet even though the heat outout is the same? Maybe the gate of the Fet is gone because of the pop I heard at turn-on? I don't know.

I have an analog and digital meter for testing.

Any ideas where to look would be helpful!

Thanks,

Vince

Netlist · 11th February 2004, 04:00 PM

Zen V?

Hopefully not the six. There's only some preliminary info on it for the moment.

/Hugo

vdi_nenna · 11th February 2004, 05:49 PM

No, the orginal Zen, with 2 amp bias, no feedback, cap-coil-cap power supply.

I was thinking it might be the CCS, because the audio coming out is low and not distorted. Maybe something went wrong there?

Anyone? Anyone?

V~

Mad_K · 11th February 2004, 05:56 PM

you can start with measuring the voltages on G,D and S on both mosfets on both channels

vdi_nenna · 11th February 2004, 06:04 PM

Good thinking Mad_K! Now that's the brain power I need!

I'll try that tonight.

Thanks!

Vince

11th February 2004, 03:42 PM	#1
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA Blog Entries: 1	Zen Amp Problem Hi All, I'm having a problem with my original zen amp. The left channel's output is really low, but not distorted. The right channel is ok. The night before, both channels worked fine. With just my senses I can see no problems, nothing smells burned, the heat sinks are exibiting equal heat output by touch in both channels. I did hear a POP in the speakers when I turned it on. To be sure nothing else in the chain is the probelm, I hooked up the CD player outs directly to the Zen. Could it be a blown MosFet even though the heat outout is the same? Maybe the gate of the Fet is gone because of the pop I heard at turn-on? I don't know. I have an analog and digital meter for testing. Any ideas where to look would be helpful! Thanks, Vince

11th February 2004, 05:56 PM	#4
Mad_K diyAudio Member Join Date: Sep 2002 Location: Norway	you can start with measuring the voltages on G,D and S on both mosfets on both channels __________________ Mads K

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11th February 2004, 04:00 PM	#2
Netlist diyAudio Moderator Emeritus Join Date: Jan 2003	Zen V? Hopefully not the six. There's only some preliminary info on it for the moment. /Hugo

11th February 2004, 05:49 PM	#3
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA Blog Entries: 1	No, the orginal Zen, with 2 amp bias, no feedback, cap-coil-cap power supply. I was thinking it might be the CCS, because the audio coming out is low and not distorted. Maybe something went wrong there? Anyone? Anyone? V~

11th February 2004, 06:04 PM	#5
vdi_nenna diyAudio Member Join Date: Oct 2000 Location: PA, USA Blog Entries: 1	Good thinking Mad_K! Now that's the brain power I need! I'll try that tonight. Thanks! Vince