4-34 Phaser 6180 Color Laser Printer Service Manual
General Troubleshooting
CRU Sensor C (Cyan Toner Cartridge Sensor)
Caution
When performing this procedure, remove and cover the Print Cartridges 
to avoid exposure to light.
1. Enter the Service Diagnostic menu (page 4-5).
2. Open the Front Cover.
3. Remove the Transfer Unit (page 8-7).
4. Remove the Print Cartridges (page 8-9).
5. Perform the CRU Sensor C test: Engine Diag > Sensor Test > CRU 
Sensor C.
6. Install and remove the Cyan Print Cartridge while checking the 
information on the Control Panel display. The Low and High values 
change from 0 up to 99.
7. Press the Cancel button to stop the CRU Sensor C test.
CRU Sensor C 
L-0
CRU Sensor C 
H-0
Control Panel
Normal
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