Volume control stopped working - NR1607
I have a 6 year old Marantz NR1607 that suddenly is experiencing a strange volume issue. Hoping anyone can give some tips on possible causes/solutions.
Without any pre-indications of issues, the AVR recently started up with volume set to 0 even though settings are to start on 35.
At first, attempts to increase volume with AVR volume knob saw the volume indicator going up a little bit when turning (to around 10) but immediately down to zero again. After a complete restart and turning the volume both ways a number of times (saw it as a tip), increasing volume with AVR volume knob got past 10 but volume would randomly both increase and decrease even when just turning it up.
Then, the more scary one (if speakers and source had been connected), one short press on volume-up on the AppleTV remote (used for AVR volume control) caused the AVR to automatically increase volume all the way to max volume (!), and one press on volume-down decrease it all the way to zero again.
Have tried turning off all connected devices to rule out any CEC-related issues and remove batteries from all remote controls to rule out it getting erroneous volume signals somehow. Also tried disconnecting power for some minutes.
Anyone got any ideas what to try?