The machine started making noise after I cleaned the scanner mirror but I've reset the sensor to its normal position but yet its still bring C3100 pls how do I clear it

The scanner lock button on the Kyocera TASKalfa 4012i is located on the left-hand side of the machine, towards the back of the scanner unit. It is a small lever that can be turned to lock or unlock the scanner unit.
To solve the C3100 error on the Kyocera TASKalfa 4012i, you should first check to make sure that the scanner lock is in the unlocked position. If the scanner lock is already unlocked, the issue may be related to the scanner motor or the scanner home position sensor.
In this case, it is recommended that you contact Kyocera technical support or a certified Kyocera service technician for assistance in resolving the issue.

Error
C3100

Description

Scanner carriage problem The home position is not correct when the power is turned on or at the start of copying using the table.

Causes

Poor contact in the connector terminals. Defective scanner PWB. Defective scanner home position switch. Defective scanner motor. The mirror frame, exposure lamp, or scanner wire is defective.
Also clean well the optics with wet cloth you can be helped

C3100 Scanner carriage problem
The home position is not correct when
the power is turned on or at the start of
copying using the table.
Poor contact in the
connector terminals.
Check the connection of connector YC4 on
the scanner PWB and the connector on the
scanner home position switch, and the continuity
across the connector terminals. Repair
or replace if necessary.
Defective scanner
PWB.
Replace the scanner PWB and check for
correct operation.
Defective scanner
home position
switch.
Replace the scanner home position switch.
Defective scanner
motor.
Replace the scanner motor.
The mirror frame,
exposure lamp, or
scanner wire is
defective.
Check if the mirror flames and exposure
lamp are on the rail. And check the scanner
wire winds correctly.
took this from a diffirent kyocera copier but it will be the same scanner related code

C3100 Scanner carriage problem
The home position is not correct when
the power is turned on or at the start of
copying using the table.
Poor contact in the
connector terminals.
Check the connection of connector YC4 on
the scanner PWB and the connector on the
scanner home position switch, and the continuity
across the connector terminals. Repair
or replace if necessary.
Defective scanner
PWB.
Replace the scanner PWB and check for
correct operation.
Defective scanner
home position
switch.
Replace the scanner home position switch.
Defective scanner
motor.
Replace the scanner motor.
The mirror frame,
exposure lamp, or
scanner wire is
defective.
Check if the mirror flames and exposure
lamp are on the rail. And check the scanner
wire winds correctly.

C3100 is a scanner carriage problem... The error code indicates that the "home signal" is not reaching the main board in the required time; The problem could be a bad board, bad motor or something mechanical...

Keeping it simple: look through the copy glass; there are two main parts or carriages. The first part is the assembly with the lamp and single mirror. The second part is the assembly with two mirrors. Both of these *ssemblies ride on rails and are connected to each other by a system of cables and pulleys. When unboxed, the KM3035 has 3 yellow screws on the upper left cover that lock the scanner assembly to prevent damage during transit... were these screws removed? Does the scanner assembly move at all when you power the machine on? Look through the copy glass: the scanner cables should be seen connected to the carriages and going around the pulleys; the cables should not be loose or laying on the deck. The home sensor might not be visible to you if the both carriages are in the way, but it is a small black object with two projections. A flag on the carriage slides between the gap created by the projections (this is the home position). Looking through the glass, the sensor is located at the left rear corner and it should not be hanging or tilted.

This code means machine's scanner home possition error. Try to check scanner home possition sensor if fixed in its possition. if not try to check scanner lamp unit movement .

its related to Scanner.. check home position sensor.. clean sensor.. reinsert connectors.. also check cable..

check if the scanner cables in the scanning section are out of position if not clean the mirrors and the scanner lamp.

C3100 Scanner carriage problem
The home position is not correct when
the power is turned on or at the start of
copying using the table.
Poor contact in the
connector terminals.
Check the connection of connector YC4 on
the scanner PWB and the connector on the
scanner home position switch, and the continuity
across the connector terminals. Repair
or replace if necessary.
Defective scanner
PWB.
Replace the scanner PWB and check for
correct operation.
Defective scanner
home position
switch.
Replace the scanner home position switch.
Defective scanner
motor.
Replace the scanner motor.
The mirror frame,
exposure lamp, or
scanner wire is
defective.
Check if the mirror flames and exposure
lamp are on the rail. And check the scanner
wire winds correctly.

took this from a diffirent kyocera copier but it will be the same scanner related code

Directly from service manual: Exposure Lamp Error: Insufficient white level detected when scanning the white plate. Possible cause: ? Exposure lamp defective ? SBU harness defective ? Bad connection ? Defect in optics system (dirty scanner mirror, mirror out of position, etc.) ? Lamp stabilizer board (or connector) defective ? Incorrect start position or length for white plate scanning (☛ SP4-015) ? Scanner HP sensor out of position