In a previous post
http://www.copytechnet.com/forums/toshiba/25630-toshiba-e-studio-3511-check-color-toner-cartridge.html
it was mentioned about cleaning the color toner sensor due to an error after the toner was cleaned out.
I'm having the exact same problems after doing a thorough toner cleanout in a Toshiba estudio 4511.
Initially this machine was throwing an error saying "Check Color Toner Cartridge"
We vacuumed out the machine, removed the toner cartridges wiped them off, removed the developers, wiped them off, vacuumed out the bottom of the machine, removed the excess toner catch tray, cleaned it off, overall just a thorough cleaning of the machine.
put it back together, tried a test sheet and it is now throwing CF20 error
Dug out the service manual, it said to
It is saying the CF20 error is due to an abnormal toner density detection voltage, and that by
holding 0&8 + power on, enter code 824, it shows
Y is rated 1
M is rated 0
C is rated 0
So I went back to the service manual and it says
Displays “1” when the abnormal
toner density detection voltage is
detected. ([CF20] error)
0: Normal
1: Abnormality detected
So I guess that the yellow is out of voltage range.
From what I can tell, this refers back to a dirty color toner sensor.
In the service manual it says:
Color auto-toner sensor
The head of color auto-toner sensor is to be cleaned with a cotton swab or soft cloth withwith an air-spray type cleaner such as a blower brush or an air duster"
sufficient alcohol filled in. The reference plate is to be cleaned by blowing off the adhered toner
The sensor seems to be located in a difficult to access locaton. Should the toner sensor be removed for the cleaning procedure?
The sensor appears to be held in by some screws that are only accessable if the output tray is removed. I tried removing the output tray, but it seems like I have to tear down 1/2 of the machine just to remove the output tray.
Anyone have personal experience with these ES4511's
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