Sometimes the error persists in memory even after the paper is removed.
Open the right-side door and use a can of compressed air or a soft cloth to clean the sensors along the paper path, specifically the Registration Sensor Check Paper Quality:
Contact an authorized Konica Minolta technician to get the latest firmware version for your specific Bizhub model. konica minolta code 9903
With machine unplugged:
Code 9903 occurs when the Main Controller sends a signal to the Video board, and the Video board fails to respond within a strict time window (usually 5 seconds). The system interprets this as a "deadlock" or "freeze" and halts all operations to prevent data corruption or hardware damage. Sometimes the error persists in memory even after
cycle from the machine's Utility menu to clear any temporary processing hangs. Hard Reset
A standard reboot via the sub-power button often fails to clear network stack freezes. Turn off the sub-power switch on the operation panel. Open the front door and turn off the main power switch. Unplug the power cable from the wall outlet. Disconnect the network (Ethernet) cable. The system interprets this as a "deadlock" or
If the laser path is obstructed by loose toner or paper dust, the machine cannot write calibration lines accurately onto the transfer belt.
Imagine you are in a rush to print a presentation. You hit "Print," but instead of the whirring of rollers, the screen flashes . This isn't just a simple paper scrap caught in a gear; it’s a signal that the printer’s "brain" (the controller) and its "eyes" (the sensors) aren't on the same page regarding the image it's about to create. Common Culprits:
: In some cases, the error may persist after stabilization due to outdated firmware. Recommended Solutions