Update some of my research result:
1.The sensor header voltage low:
http://canonipf.wikispaces.com/share/view/60042376
2.PCB fail:
http://canonipf.wikispaces.com/share/view/60075672
Good Morning @The Hat .
I try to enter Service Mode by follow the procedures in Chapter 7 (Page 330) by "Feeder Selection + Information" buttons holds during power on.
But it still stop at the "Close Upper Cover" error.
I also try the next Mode which is download firmware mode, which can...
Thank you so much for your input @PeterBJ.
I checked the "light blocking sensor arm", it seems alright.
Also try to use a small metal scale insert into the sensor slot to block the light.
No luck yet.
Next I have to disassembly the top, see what I can find over the sensors.
Much Appreciate!
1) When Power on the printer shows Error: "Close Upper Cover", the Cover is closed for sure. Not able to do anything after that, even not able to power off. Has to unplug the power cord.
Attached please find the photo I took about the Error.
(2) Before this, the printer showing Error:"Call...