F2 error code toner - Sharp AR-M160 Laser Printer

SOURCE: F2-02 error on Sharp AR-M237

on this code you may have to clean out the developing unit and start with fresh developer. Make sure the developer unit is not leaking from one of the bearings. You may need a tech for this one...

SOURCE: Sharp AR-150N displaying F2 Error code.

Hello sir; I can't find this error code in my manu please check your code again.

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SOURCE: SHARP AR-287 F2-00 error code

Although this appears to be an ATC (automatic toner control) problem and it may list as such in service manual which gives brief description of error code it is often something else.
There is a sponge roller at bottom of toner that wears down considerably and when the hopper is very low or out of toner the otner light will come on(triangle of dots). The customer puts the new toner in and the sudden surge of a large amount of toner cascading into the hopper causes an excessive amount of toner to go past the sponge roller and directly into the developer unit which is directly under toner hopper.
The ATC sensor is on the bottom of developing unit and "reads" the density of the developer /toner ratio and with a very overtoned situation as the one created above you would get an F2-00 code.
What is normally done is to either dump toner out of hopper and replace sponge roller and seals or replace toner hoppers as a whole which is quicker and costs almost rh same as cahnging the sponge roller and seals is more labor intensive.
Also the developer is now contaminated with an excessive amount of toner and the recommende solutin is to replace the developer and calibrate theu service program.
This is hardley recommended by a service man unfamiliar with this mode let alone the customer. I ahve been in the Bay Ridge area for years and as a matter of fact bought an investment property thru Petses Realty. Frank

SOURCE: ar405 error code f2-31. how

Content Process control trouble (OPC drum
surface reflection rate abnormality)
Detail Usually the sensor gain is adjusted so
that the output is a certain value, by
reading the drum base surface with the
image density sensor before starting
process control.
However, a certain output is not obtained
by adjusting the sensor gain.
Cause Image density sensor defective
Check Check process control sensor output with
SIM44-2. (Do not adjust)
and
remedy If the result is far different from the
specified value, it suggests the sensor is
defective. Check the sensor and harness.

If the deviation is relatively small, check
the sensor and drum surface for
contamination.