Brother HL-4040CN Service Manual page 50

Error code C8
Out of Memory
Secure Print Data is full. Press Cancel and delete the previously
stored data.
RAM area for secure data full
User Check
- Delete the stored data.
Step
1 Main PCB failure
Error code CA
Unusable Device
Remove the Device. Turn the power off and back on again.
Excess current to USB device
User Check
- Remove the USB device from the USB direct interface and turn the power off. Turn it on
again after a while.
- Replace the USB memory with other one.
Step
1 Harness connection failure of
USB host relay PCB ASSY
2 USB host relay PCB failure
3 Main PCB failure
Error code CB
No Belt Unit
Open the Front Cover, pull out the Drum Unit completely and install
the Belt Unit.
Belt unit is not installed into the machine.
User Check
- Check if the belt unit is installed into the machine.
Step
1 Harness connection failure of
density sensor holder ASSY
2 Density sensor failure
3 Transfer HVPS PCB unit
failure
4 Engine PCB failure
Cause
Replace the Main PCB ASSY.
Cause
Check the harness connection of the USB host
relay PCB ASSY and reconnect it.
Replace the USB host relay PCB ASSY.
Replace the Main PCB ASSY.
Cause
Check the harness connection of the density
sensor holder ASSY and reconnect it.
Replace the density sensor holder ASSY.
Replace the transfer HVPS PCB unit.
Replace the engine PCB ASSY.
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Remedy
Remedy
Remedy
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