Samsung CLP-775ND Series Service Manual page 101

► Error Code
C9–3112
► Error message
Replace dust cleaning / Replace with new dust cleaning kit.
► Symptom
Dust cleaning kit is at the end of its life.
► Troubleshooting method
1) Open the front cover.
2) Remove the PTB unit.
3) Replace the dust cleaning kit with new one.(Refer to 3.3.4. Dust Cleaning Kit)
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4. Alignment and Troubleshooting
4-42