AVR-1801 5.1 Channels Receiver schematic

These only means one thing... repair.

The manual... http://www.retrevo.com/support/Denon-AVR-2310CI-Receivers-manual/id/23452bh638/t/2/

I'm pretty sure you mean "LFE + Main".

You need to identify the speakers to the receiver as Large or Small regarding their bass-handling capacity more than their actual size.

"LFE" removes the possibly overloading bass in a given speaker channel containing 'small' speakers and sends it to the subwoofer.

"LFE + Main" is sort of explained on page 29 "Bass Setting". The intent of LFE+Main is to task your subwoofer with the bass that ALSO exists on all other speaker channels regardless of their ability to handle it all by themselves. As you can imagine, this might make the subwoofer respond to sonic events that are actually supposed to be directional from, say, the rear channel(s). In that case the event might seem to come from wherever the sub is located instead of the intended direction; or at the very least it might seem to come from both places which is probably not what the sound engineers intended when they recorded the piece.

Having full-range speakers 360-degrees around PLUS a subwoofer, I don't subscribe to the 'bass-is-non-directional' school of thought. If you've ever felt the concussion from and subconsciously glanced toward one of the speakers after, say, a huge explosion, the system is working.

Generally speaking, an amp attempts to protect itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on.

Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.

You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.

If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.

If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Here's the link to search Denon manuals past and present.
http://usa.denon.com/us/downloads/pages/instructionmanual.aspx
I hope this helps you.
Bobya.

A Denon AVR 889 is not a sub so we don't know anything about the sub in question.

Maybe the existence of the sub is no longer set in the AVR. Look at the speaker definitions first before going to wild.

Try another cable to the sub.

OR, run the sub's signal supply cable to one of the Tape Outs on the receiver and tune in something on FM. If that works a) it will be loud, and b) go back to the SUB settings on the AVR.

Crack the sub open and access the terminals on the speaker itself. Disconnect them from internal components and run one of your amp channels directly to it. If it works, the amp or signal path are dead. If it doesn't work, it's a dead driver.

hello there could be number of things if i was repairing it i do visual check first with a good light 1 check for burn't parts resistor cracked transistor bulging capacitors if seems ok then i check underneath the board for a dry joints these can cause a lot of problems . if that seem ok then i try and find a bit more info i'e schematic diagram this when you will need to test the components and voltages .i hope you get somethink sorted good luck

regards
shaun

optical cables will only go in one way. dont force it and break something. good luck

Two resistor are open circuit(R141,R142). Replace them

F101 is 8 amp / 250 volt slow blow
F103 is 315 mA / 250 volt slow blow