I have a denon dra-755 receiver that i have had since new in 1986 and for some reason it now only tunes to even numbers (104.4 instead of 104.3) does anyone know why?

SOURCE: right channel not working

check the pre out /main in jumper there should be a loop jumper for both left and right. if you are using a graphic EQ check the wires connecting to the receiver and the EQ. also is this happening on all sources?

SOURCE: MY DENON DRA-435 A RECEIVER

These recievers were infamous for the power transformers going bad(opening) if more than 2 speakers were hooked up and it was cranked up.Did it die while playing?Do you have 4 or more speakers hooked up?Was there a power surge?Let me know........

SOURCE: denon receiver (DRA 397) will not speak to iPod dock

IF YOUR NOT USING A DENON IPOD DOCKING STATION IT WILL NOT FUNCTION CORRECTLY.
YOU CAN CONNCET OTHER TYPES OF IPOD DOCKING STATIONS BUT YOU WILL NOT HAVE CONTROL THROUGH THE DENON AND ONLY CONNECT THE AUDIO FOR THAT DOCKING STATION TO THE DENON AS ANOTHER SOURCE INPUT

SOURCE: hooking in everthing to a Denon DRA-395 Receiver

TRY THIS

http://www.ca.denon.com/2403.asp?archivedModelSearch=true&clearCurrent=true&archivedCategory=Stereo&archivedModel=DRA-395&imageField.x=116&imageField.y=9

OR

http://www.ca.denon.com/DRA395_ownersmanual.pdf

SOURCE: Denon DRA-37 Receiver-Remote lock on. Need to unlock.

Refer to the "Initialization of the Microprocessor" section of the manual (page 16 of the PDF version of the manual).
1) Turn the unit OFF using the On/Off switch (not the standby switch).
2) Depress both the Speaker A and B switches, and turn the Power ON.
3) The entire display should flash at 1-second intervals. The microprocessor should be reset, and the remote should be unlocked.