kemper input...doesn't work

welcome to the forums @WhyD
sorry for stupid question, but is the guitar plugged into the INPUT (the one on the right)? it isn't uncommon to plug guitar into the HEADPHONE, even for pros
isn't the volume of guitar turned down all the way?

Welcome! Hopefully it is something simple. What @skoczy suggested, happens to many on accident.

Welcome WhyD! Have you read the manuals? There is also a great info by @viabcroce

Take good care of the souls of those tube amps you lure into the studio and vampire!

Quote from WhyD

@skoczy
It correctly connected to the input terminal
guitar volume is also not zero
Even if the volume of the pedal to zero should the tuner is activated.

Can you try another guitar cable?
What do you mean by "Even if the volume of the pedal to zero should the tuner is activated". Tuner is activated by switching the ckichen knob to relevant position. Do you mean that while switching to tuner, you don't see the tuner's bubble?
If you're using volume pedal, please remove it from the signal chain and check again.

Checking the correct input was a sensible suggestion...been there.....

Suggest you unplug everything such a volume pedal.

Are you getting input either on the tuner or input level ?

I am now experiencing this same thing: no input or INPUT LED activity.

I lost INPUT LED activity after changing CLEAN SENS on several rigs, re-booted system and INPUT LED activity returned, however, no strobe tuner. Bubble tuner will show, however, no input = no tuner activity.

EDIT -
Redownloaded the 4.0.4 and attempted to boot from USB (holding both PAGE buttons at chicken-head knob switch on) and received error message:
"booting & burning from USB device
ERROR: unable to locate firmware file on USB"

Turned system off (took a few seconds before it actually shut off) and tried same process again to same message. Instead of turning off, I turned to browser mode and got nothing, turned system off, turned back on and now it's working, including strobe tuner, as normal. ?!?

?Ticket?

Quote from skoczy

What do you mean by "Even if the volume of the pedal to zero should the tuner is activated"

In Vers 4.x the strobo type tuner don't show anything if there is no input signal.
Otherwise you would have a very nervous screen like with the bubble type.

Generally is to say that the issue is a case for support.
No remote diagnosis seems to be possible.

Quote from brianiac5150

I am now experiencing this same thing: no input or INPUT LED activity.

I lost INPUT LED activity after changing CLEAN SENS on several rigs, re-booted system and INPUT LED activity returned, however, no strobe tuner. Bubble tuner will show, however, no input = no tuner activity.

A lot of misconception here.
You need to select the strobe tuner from the tuner menu. Also the automatic tuner is only available if a connected volume pedal is set to -5 in the pedal range menu.

Quote from brianiac5150

Redownloaded the 4.0.4 and attempted to boot from USB (holding both PAGE buttons at chicken-head knob switch on) and received error message:
"booting & burning from USB device
ERROR: unable to locate firmware file on USB"

Turned system off (took a few seconds before it actually shut off) and tried same process again to same message. Instead of turning off, I turned to browser mode and got nothing, turned system off, turned back on and now it's working, including strobe tuner, as normal. ?!?

Dude, you are confusing everything here.
When you want to boot from USB you need to put the kaos file in the root directory of the USB.
But why would you want to do this in your case3 here is beyond me.

Quote from Ingolf

A lot of misconception here.
You need to select the strobe tuner from the tuner menu. Also the automatic tuner is only available if a connected volume pedal is set to -5 in the pedal range menu.

Dude, you are confusing everything here.
When you want to boot from USB you need to put the kaos file in the root directory of the USB.
But why would you want to do this in your case3 here is beyond me.

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Ingolf…thanks for your response.

I do have a Boss FV-500H connected to Remote's 5 (and one to 6), cables are properly connected and good, with strobe selected. There simply was no input, therefore, it registered nothing and was a block in the displays. Very much as Sharry alludes to above. Typical function is I move volume pedal to zero and tuner displays (KPA and Remote), which was not happening, along with the fact that I was not getting any input signal - sound or LED.

The confusion here is likely a result of me jumping across a couple threads in trying to figure this out. I did have an error message after v4.0.4 install – which I initiated in an effort to resolve this input issue; therefore, was hopeful a complete re-install of v4.0.4 could be the solution. On a side note; I was not aware the OS needed to be on the ROOT, as opposed to OS UPDATE directory, which likely attributed to the error message.

Somehow I did resolve my issue and my KPA/Remote seem to be back in working order or I definitely would’ve pursued the above suggested support ticket route. Fact remains that (with v4.0.3) while playing and switching between rigs, changing settings and all the usual Kemper affair, I lost INPUT LED signal and pedal 5 no longer activated the strobe tuner when at zero. Only difference between OP and my experience is that I did have sound...until I attempted v4.0.4 update.

You should also check the noise gate knob on the left of the KPA...maybe its turned all the way...