Canon TS8251 - intermittent 5011 error

[Glomgold]

I got a 5011 error out of the blue. The error appears a few seconds after I power it on, the carriage doesn't move, sometimes it tries to move right before the error appears.

I have had it running normally 2-3 times, when it starts up normally it's nothing wrong, no strange sounds.

There was quite a bit of ink in the area around the pads, I've cleaned this up.

The encoder (?) strip is clean as far as I can see.

I cleaned a metal plate facing forwards, the carriage moves along the plate, it was full of ink.

No paper jams.

Nothing loose that I can see or hear when I tilt the printer to all sides.

I've had it disconnected from power for days etc.

I'm planning to remove some panels to get a better look at things, but I really don't know what I'm supposed to look for.

 

[PeterBJ]

There are no service manuals available for the TS8251, but service manuals for other AIO printers suggest a scanner error.

Druckerchannel.de has an article with lists of Canon error codes here. You can use Google translate or other translator if you don't read German.

Here is a clip translated to English:

 

[Glomgold]

Thank you.

The scanner moves ever so slightly when I turn it on. It's been standing in one place since new, I'll try an disconnect it.