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Old 10-08-2017, 02:50 PM   #23
R_J
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Join Date: Jun 2012
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Default Re: Philips FR-740 working but no audio output

I think +4.4 for the amp protect line is for normal operation, I suspect a low would tell the amp to be in protect?
If the amp lr line is not high (+5 volts) then the amp on circuit will not be told to turn on, I can't see what conditions need to be met for the micro to say turn on the [amp lr] line?
It looks like the voltages marked on the schematic are for normal operation (bottom right of page 80)
Do you have the remote? can you turn the Mute on and off?

It sure looks like something in the menu somewhere has turned the amp off

Last edited by R_J; 10-08-2017 at 03:22 PM..
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