The volume control knob fell off can i buy a new one model htr 5860 yamaha

You really need to look in the manual. The individual channel levels (and other parameters) are adjusted in the initial setup. This isn't your grandpa's stereo that you just turn on and listen.

Register and download the manual for free at retrevo.com

http://www.retrevo.com/support/Yamaha-HTR-5860-Receivers-manual/id/394ci075/t/2/

Read this...

http://remotes.com/remotes/servlet/rs?a=Display&contents=help_deadremote&uuid=A12963989782821

The volume keys should be working by default, but you may have volume punch through turned on (meaning the remote is sending signals for TV or CABLE volume function no matter what mode you are actually on). To unlock volume control for AUX mode, do the following:
1. Press and release AUX
2. Press and hold SETUP until the remote blinks twice
3. Type 993
4. Press and release VOL-
The remote should blink four times to confirm unlock.

I assume you want to slave it to the receiver and drive some more speakers with it.

Connect some RCA cables from whichever channel pre-outs you want on the HTR-5860 to any input on the AX-596.

Set the AX volume to something sufficiently high, run through the HTR's speaker level setup and match the AX volume to match the channels on the receiver. Then leave the AX's volume alone.
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If you just want the AX to have access to program sources of the HTR, run the RCA cables to it from one of the VCR1 or 2 Out (but DO NOT select whichever one you use via the front panel). These are not affected by the HTR's volume controls.

Go to the company web site for the remote, there should be code there.

turntables require a special input... I'd check crutchfield to see if there is something they might have to make it work better...

If it doesn't have a jack made for plugging Mp3 players into it like the new car stereo's do than you just have to go buy an FM transmitter that is made for Mp3 players. It will play through one of your low FM frequency's on your receiver. You can generally pick one up for around $20

Yamaha av amplifiers have a high failure rate needs to be serviced

Kent, Unfortunately, it sounds as if the encoder is broken. The encoder is a digital input which takes the place of a traditional volume control, and is what holds the volume knob in place and spins. Since it works fine with the remote, that means everything else is ok, but you will have to replace, or have a tech replace, the encoder itself.

Are you nuts? You dont need EQ to this system.This is such a nice syetem,inbuilt EQ gives very good output.Don't try to connect EQ if you are not an engineer.It can be connected with external source