Error
code
Description Action
84 Imaging unit—nearly low
84 Imaging unit—middle warning
84 Imaging unit—late warning
84 Imaging unit—end of life Replace the imaging unit.
88 Toner cartridge low Replace the toner cartridge.
Toner level sensing error check
Action Yes No
Step 1
Ensure that the toner cartridge is installed properly.
Is the toner cartridge properly installed?
Go to step 2. Reinstall the toner
cartridge properly.
Step 2
Remove the existing toner cartridge and install a different cartridge.
Does the error continue?
Go to step 3. Problem resolved.
Step 3
Ensure the cable for socket “JCTLS” on the controller board is properly
connected.
Is the above connection properly connected?
Go to step 4. Reseat the connection
or replace the cable.
Go to step 4.
Step 4
Ensure the toner low / imaging unit high voltage contact is free from
damage.
Is the toner low / imaging unit high voltage contact free from damage?
Go to step 5. Replace the toner low /
imaging unit high
voltage contact.
Step 5
Reset the machine.
Does the error continue?
Replace the controller
board. See “Controller
board removal” on
page 492.
Problem resolved.
4063
Diagnostic information
235
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