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R_J 06-12-2019 10:29 AM

Re: Harman Kardon AVR 270
Are you sure about those pin numbers? Pin 1 is the 5 volt supply voltage, Pin 2 is ground, pin 3 is the output
But heating never did turn on the fans? It does seem odd that neither fans runs, FAN1_ON and FAN2_ON commands come from ic2103 and should output around 3v to D980 & D970 Fan1 (heatsink) also needs audio at the speakers to turn on the heatsink fan.
Have you tried a processor reset (page49)

playman 06-12-2019 11:01 AM

Re: Harman Kardon AVR 270
My apologies, pin 3 gave me +5v and pin 1 gave me +2v.
Nope fans never turned on, just went straight into shutdown.
Yes I did a processor reset when I fixed the FR channel the first time.
It seems to be running colder after the bias adjustment.

playman 06-12-2019 11:11 AM

Re: Harman Kardon AVR 270
1 Attachment(s)
The current heat after 10 minutes running on medium(ish) volume.

R_J 06-12-2019 11:16 AM

Re: Harman Kardon AVR 270
There are two test points near ic2103 (TP59, TP60) you could check the voltage on them, they should be around 3 volts for fan ON, 0 would be fan OFF

playman 06-12-2019 11:47 AM

Re: Harman Kardon AVR 270
They both gave me 0 voltage, even with the fan test shorted (if that matters)

R_J 06-12-2019 11:57 AM

Re: Harman Kardon AVR 270
The fan test would have no effect, these two test points are direct from the processor, so for some reason the microprocessor is not outputing the fan on command.

playman 06-12-2019 12:11 PM

Re: Harman Kardon AVR 270
So I guess the only way to fix it is to replace the processor?

R_J 06-12-2019 01:27 PM

Re: Harman Kardon AVR 270
I don't know if that would fix it, You may need to crank it up for a while to see if they will come on, I really can't be sure.

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