My onkyo tx-ds838 motor fan do not move - Onkyo TX-DS838 Receiver

That is an INRUSH rated so it is a slow acting fuse

Get a RCA cable and connect from your amp where it said Sub Woofer in the Pre Out box in the back of the amplifier top left hand side and take it to the "Sub In" located in the back of your Sub woofer bottom right hand (White round connector).
Good Luck!

Are they defined? How do they sound with test tones?

http://www.retrevo.com/support/Onkyo-TX-DS838-Receivers-manual/id/365ag203/t/2/

We can't assume that all has been followed in the manual.

Dit betekent dat de versterker een fout heeft opgemerkt.
een aantal oorzaken zijn als volgt:
- een te hoge temperatuur, dit zou na een half uur afkoelen zijn verholpen.
- interne software fout, deze zou na 5 min zonder spanning verholpen zijn.
- een kortsluiting in (een van) de luidsprekers, alle luidsprekers loskoppelen kan zekerheid bieden.
- een defecte stuur of eind trap.


helaas is in de praktijk het laatste de meest voorkomende oorzaak en dient de versterker te worden gerepareerd.

Not worth repairing until the root cause of the failure is proven.
The reason being is that you can have it happen again if caused by any of the devices attached to it, such as inefficient speakers.

http://safemanuals.com/user-guide-instructions-owner-manual/ONKYO/A-809-_E
Follow the link and you can download the manual for free.
thank you,
Lee

Go to http://www.retrevo.com/, regsiter for free and search for Onkyo TX-DS838. It will prompt you to download the manual (3.3MB).

I went back and found a loose cable/coax. Re-attached and now the receiver works as good as ever.

The problem here is that the output amplifier section has a problem. This is detected internally and the system shuts down in a "protect" mode. The output section really only kicks in when you attempt to bring up the volume. Another possibility is a problem in the "front end" where DC current is being passed to the amp section. Without takeing measurements, it is difficult to determine the exact cause. This should be a relatively stright-forward repair for a service shop and should cost about $20-$40 in parts plus the local labor charge.
Dan

Same problem here....took it to authorized onkyo repair and cost was $700+ for new board. Got the 707 from crutchfield instead.