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Old 9th October 2012, 04:42 PM   #11
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I was preparing to install the outputs but wanted to make sure the regulators were behaving 1st. The voltage measurement was done to ensure I had bled the caps. I said the measurement was taken before removing B+, what I meant was after. I normally attach a meter while bleeding a power supply to ensure it's truly discharged. I just thought it was odd to see such a discrepancy between the two sides. I'll proceed with one channel and see how it goes.

Thanks
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Old 19th October 2012, 07:20 PM   #12
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Finally found some time to work on this again. Installed the outputs for one channel (Grey/Green), powered the amp up and all looked fine. injecting a 1k sine wave produced a nice clean output. I moved on to the second channel (White/Blue) and had good results as well. The third and forth (orange/black and yellow/brown) produce no audio output. idle current is at ~2.5 amps. Where should I be looking next?
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Old 19th October 2012, 08:09 PM   #13
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Do you have both positive and negative rail voltage on the output transistors for those channels?
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Old 19th October 2012, 08:29 PM   #14
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Yes I have -40.9 and 40.7 present for all outputs.
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Old 19th October 2012, 08:51 PM   #15
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Are you sure that you're sending signal to the correct inputs on the amp?

Is the input selector switch in the correct position?
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Old 19th October 2012, 09:01 PM   #16
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I wondered the same and cleaned / verified the selector switch and ohm'd out the inputs on the DIN input. I do get a sinewave output from the two channels but it's ~1v P-P and at a fixed 1.5 MHz.
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Old 20th October 2012, 02:25 PM   #17
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Perry - you nailed it. The selector switch has a third position that is normally locked out with the cover installed. I was going past the second position by mistake. I'm going to let it burn in for a while and re-check before closing it up, but so far it looks good. Any other areas on this amp that I should look out for before it goes back in service?

Thanks again for the help Perry & Sean.
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