Samsung SL-X704LX Manual De Usuario

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10. Troubleshooting
Replacing the imaging unit
X703 series uses four colors and has a imaging unit for each one: yellow(Y), 
magenta(M), cyan(C), and black(K).
K703 series uses one color and has a imaging unit for black(K).
When the life of the imaging unit expires totally
The status LED turns red on and the display screen shows the error message 
for replacing imaging unit. 
Check the type of the imaging unit for your machine.(see "Consumables and 
At this stage, the imaging unit needs to be replaced.