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The rotary switch is probably not broken because turning it the mark v's foot pedal's fx light will come on or off. It is estimated that the circuit that broke the effect loop internally or a component failed. But this is beyond the scope of what I can repair, so I can only do this for the time...

Yes . I've tried bypass mode. In this mode, the fx loop effect is gone. It would be really weird if the fx loop effect is still there in this mode，haha.

I found that the fx light above the power switch never light up. Whether it's adjusting the knob on the back or using a foot switch. Because it wasn't bright, I didn't notice there was a light there before. But the effect of fx loop is always there.

I tried just about everything ,including tapping the knob, disconnecting the footswitch, rotating the control many times with the amp powered up, and vacuuming. . . . I gave up. haha, just use the pedal to turn it off.

I also think the switch is stuck due to not being used for too long. I turned the loop control knob on the back repeatedly, and just two cables inserted in the send/return with nothing connected, the cabinet make a little sound. Before there was no sound at all. I will try tapping on the relay...

My mark v is the 90w version, I also forgot that it has 25 watt and 30 watt versions. . . . .Sorry for not making it clear before.

Thank you very much for your answer. I'll try to fix it, and if it doesn't work, I'll find someone to fix it. Thank you again!

yes. I tried just two cables inserted in the SEND/RETURN with nothing connected, the cabinet makes no sound. If I unplug the send/retuen line, or connect a Pedal, there will be sound. I only connected the original mark v pedals。

hi，everyone。 I bought the mark v for a while and almost never used the loop. Recently, I connected the loop and found that I couldn't turn it off. Neither the knob behind the mark v nor the Fx switch on the foot pedal could turn it off. When I turn the rear knob to ft sw and press the...