Bias Adjustment on Bose 1800 Amplifier - diyAudio
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Old 18th December 2011, 02:45 PM   #1
diyAudio Member
Join Date: Sep 2010
Default Bias Adjustment on Bose 1800 Amplifier

So I'm trying to set the bias according to the manual and I seem to be unable to see any current. Every time I adjust the pot the current spikes up then drops back down to 0 or .001mA. I assume I'm supposed to be monitoring DC current...

Here's the procedure:
Click the image to open in full size.

Here's how I have it setup:
I removed the -85 lines and zip-tied the eyes together, then connected an alligator clip around them for the meter. I made a simple wire and attached the other alligator lead to the - terminal on the capacitor.

Click the image to open in full size.

Same results for the other amp board.

I must be performing this procedure incorrectly. If anyone can let me know what I'm doing wrong, I'd appreciate it

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