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Are all speaker relays removable? One receiver with two relays?

Hi there, I mean if all speaker relay COVERS are removable. I have a Yamaha AX-730 and suspect it needs some cleaning. I tried to use two nails as levers to lift the black plastic cover but it seems it can’t be removed. Not sure if I should apply more force, being afraid I may have in fact loosened the solder. Do some speaker relays have fixed covers so they have to be desoldered for cleaning? Or by cutting a hole on the cover for cleaning?

I also find a black box of the same size and shape above the relay (please see the photo) but without any identification on it. What is that?
jp2020

Showing 2 responses by atmasphere

atmasphere's avatar
atmasphere
12,099 posts
 
I'd go with that. If you cleaned front panel switches, one trouble-maker is the 'tape monitor' switch which is notorious for knocking out one channel mysteriously. You might have already sorted that out.
atmasphere's avatar
atmasphere
12,099 posts
 
I've removed the covers to relays like that before. They aren't really intended to be removed, so its likely they will not snap back in place very well once you've cleaned the relay contacts.

IME cleaning relay contacts is problematic. When the contacts have got to the point that they are able to corrode, the relay is on borrowed time and you will find that the contacts will need service again, sooner rather than later. If you can find a replacement you are better off replacing the relay itself. IOW only clean the contacts when you have no other choice.
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