Need Marantz 2230 Bias Procedure

mvarney · 10th November 2006, 08:35 PM

Hi everyone,

I recently acquired a Marantz 2230 receiver that seems to be working OK, but I'd like to check the biasing to be certain. I don't think it's been adjusted in the past 20 years, based on what the original owner said, so I'm certain the bias current and DC offset (internal) have drifted.

Anyone here have the procedure for checking and setting bias current and DC offset (I think both of these are settable in this amp--there are two pots per power amp)? I already have the schematics, but that doesn't do me much good in itself.

Thanks,
Matt

gni · 1st March 2007, 04:58 AM

post the schematic. . .then we can see about adjusting the amp. . .
a service manual will tell you the bias current (via voltage across two
points--usually the output resistor).

10th November 2006, 08:35 PM	#1
mvarney diyAudio Member Join Date: Sep 2006	Need Marantz 2230 Bias Procedure Hi everyone, I recently acquired a Marantz 2230 receiver that seems to be working OK, but I'd like to check the biasing to be certain. I don't think it's been adjusted in the past 20 years, based on what the original owner said, so I'm certain the bias current and DC offset (internal) have drifted. Anyone here have the procedure for checking and setting bias current and DC offset (I think both of these are settable in this amp--there are two pots per power amp)? I already have the schematics, but that doesn't do me much good in itself. Thanks, Matt

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1st March 2007, 04:58 AM	#2
gni diyAudio Member Join Date: Sep 2006	post the schematic. . .then we can see about adjusting the amp. . . a service manual will tell you the bias current (via voltage across two points--usually the output resistor).

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