Pioneer SX1010 popping noise

There seems to be a problem with the tone controls, specifically 'high
cut', 'low cut' &
'-20 db' switches also the 'tone on/off' switch. Whenever one of these
is activated, even
at 0 volume, a loud pop is heard and of the spkr relay kicks off
momentarily. There must be
a coupling cap somewhere that's not surpressing the transition noise
that directly affects
the mains output. Can someone shed some light on this. All other
controls operate normally,
no crackling of the volume pot or scratchy bass & treble controls. I'm
stumped!
Cheers, Steve

.

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