A logical "jam" where the machine's internal controller cannot process data fast enough or at the correct timing.
Plug the power cable back in and turn on the main and sub-power switches.
The most common trigger for J-9903 is a defective drum unit, particularly the Black (K) drum. If a drum cannot hold a proper electrostatic charge or fails to lay down the calibration patterns correctly onto the transfer belt, the Image Density Control (IDC) sensors will fail to read it, prompting a 9903 system crash. konica minolta code 9903
: Review the level history for IDC sensors 1 and 2 in service mode to see if they are reading within normal parameters.
To permanently resolve a persistent Konica Minolta 9903 error, proceed through the following hardware and software diagnostic steps. A logical "jam" where the machine's internal controller
Switch the machine back on and allow it to attempt startup stabilization. Step 2: Check Physical Components
Before inspecting mechanical components, clear the volatile memory cache of your machine. If a drum cannot hold a proper electrostatic
Access the (usually by hitting Utility -> Counter -> Stop 00 Stop 01). Navigate to Imaging Process Adjustment .
Unplug the main power cable from the wall outlet and wait at least .