Trouble code c0204 on km c250i

[Esron Thomas]

I usually test MFUs in the following order:

Step 1. Take a working sensor from tray 1 and install it in tray 2.

• If the issue moves to tray 1, then...
• If everything stays the same, proceed to Step 2.

(You can check its functionality from the Service Menu under "Sensor Check." Open position = 0, closed position = 1. I think that’s how it works. In this mode, you can see whether the sensor responds when the tray is closed or lifted.)
This is what my working sensors look like when the second tray is closed (with no paper loaded):
photo_2025-07-15_15-56-14.jpg
photo_2025-07-15_15-56-23.jpg

Step 2. Take a working lift motor from tray 1 and install it in tray 2 .

• If the issue moves to tray 1, then...
• If nothing changes, move on to Step 3 ))

Step 3. Check the wires connected to the sensor and the motor.

PS. Make sure the paper lift mechanism (inside the tray itself) is functioning properly.

PPS. If none of the above helps, move on to the CPU board (CPUB) and software-related troubleshooting.

Beyond this, I don’t know how else to assist with your diagnostics. I think many engineers would agree with me.

Thank you I'll try that out

[femaster]

Check the lift motor and see if the drive cog popped of the shaft of the motor. I haven't seen that happen on an i-series yet, but it used to happen pretty frequently on older models. They use 3 flimsy little plastic tabs to hold it in place, and if the customer liked to slam the drawer shut, they would eventually break off and the cog would go flying off since it's spring loaded.