Oki C542 User Manual page 107

Wait a moment. Executing maintenance.
The programs on the machine are being updated.
Do not turn the machine off until the update completes.
The machine automatically restarts after the update completes.
Toner Low.
The toner indicated on the screen is low. Have a new toner cartridge ready.
Waste Toner Full Replace with new Toner Cartridge.
Waste toner is full. Replace the toner cartridge with a new one.
C: Cyan (blue), M: Magenta (red)
C Non Recommended Toner.
An optimum C (Cyan, blue) toner cartridge is not installed.
Use a toner cartridge that matches your machine.
M Non Recommended Toner.
An optimum M (Magenta, red) toner cartridge is not installed.
Use a toner cartridge that matches your machine.
Y Non Recommended Toner.
An optimum Y (Yellow) toner cartridge is not installed.
Use a toner cartridge that matches your machine.
K Non Recommended Toner.
An optimum K (Black) toner cartridge is not installed.
Use a toner cartridge that matches your machine.
Error Postscript
A postscript error has occurred.
Image Drum Near Life.
The image drum indicated on the screen is near life. Have a new image drum ready.
C: Cyan (blue), M: Magenta (red), Y: Yellow, K: Black
Fuser Near Life.
The fuser unit is near life. Have a new fuser unit ready.
Belt Unit Near Life.
The belt unit is near life. Have a new belt unit ready.
Fuser Unit Life. Install New Fuser Unit.
The fuser unit reaches its lifetime.
Replace the fuser unit with a new one.
Belt Unit Life. Install New Belt Unit.
The belt unit reaches its lifetime.
Replace the belt unit with a new one.
Toner empty. Replace with new Toner Cartridge.
The toner indicated on the screen is empty. Replace the empty toner cartridge with a new one.
C: Cyan (blue), M: Magenta (red), Y: Yellow, K: Black
Toner Cartridge Not Installed.
A color toner cartridge indicated on the screen is not installed.
Install the toner cartridge.
C: Cyan (blue), M: Magenta (red), Y: Yellow, K: Black
Image Drum Life. Please install new Image Drum Unit.
The image drum indicated on the screen reaches its lifetime.
Replace the image drum with a new one.
C: Cyan (blue), M: Magenta (red), Y: Yellow, K: Black
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6. Troubleshooting