Technics SU-V7

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Dear Friends,

I am trying to help fix an old Technics SU-V7 amp belonging to a cousin of mine. Everything is working fine, except the loudness circuit. On or Off makes no difference. Bass, Treble and filter switches are working fine. I notice that the Volume pot is a standard rotary 3 pin instead of a usual 4 pin pot used in loudness circuits. I checked the pot with a meter and it is fine. Can someone please some clues on what could be wrong.

Thank you in anticipation.

Rajoo
 
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Check the switch operation with a meter and just trace the switch back...

This has to either physical, as in intermitent/faulty switch, or cracked print somewhere.

Without looking at a circuit I assume a 3 pin pot is correct and that it's not been swapped.

Both channels faulty ? Suspicious if so.
 
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