Service manual

Troubleshooting
Samsung Electronics 4-9
4-4-5 MAINTENANCE
CLEAN DRUM
Use this feature to get rid of the toner remained in the development unit, so you can get a clean printout.
Perform this feature if stains or specks appear on the printing materials and print quality falls.
Perform this feature several times until a clean printing material appears.
The machine automatically pulls in a sheet of paper,and prints out.The toner particles on the OPC drum sur-
face is fixed to the paper.
FLASH UPGRADE
It is Firmware Upgrade function and has two methods, Local and Remote.
More information can be found in the firmware upgrade items.
ADJUST SHADING
The function is to control to get the optimum scan quality by the specific character of the CCD(Charge Cou-
pled Device). If the copy image quality is unsatisfied, perform the function to check the condition of the print
out for checking whether or not having CCD trouble.
< Method >
1. Select the [ADJUST SHADING] at the TECH MODE.
2. Push the SET UP button then an image will be scanned.
3. After the scan, CCD SHADING PROFILE will be print out.
4. If the printed image is different to the image, the CCD is defect.
NOTICE : When you test CCD, make sure
that the cover is closed.
ANSWER ON CNG
The function is to control the CNG TONE cognition times for entering receiving mode from the AUTO MODE
or ANS/FAX MODE