Hi, I'm new to this so I hope someone out there can help. I've recently dug out my old Harmon Kardon HK620 Amp that has been in storage. Now I may have damaged it when taking it out of the box but for some reason, the remote control won't turn the volume knob as it prevouisly did. The remote works for everything else. Is there a quick fix for this?

Any help would be much appreciated.

Thanks,

Dave.