Brother International MFC 8890DW Service Manual - Page 151

■ Completely blank Step 1 2 3 Cause Check Result Remedy White level data malfunction Is the problem solved by Perform the acquisition of performing the acquisition of white level Yes white level data. (Function code 55) data. (Function code 55) CCD unit failure Is the problem solved by replacing the CCD unit. Yes Replace the CCD unit. Main PCB failure Is the problem solved by replacing the main PCB. Yes Replace the main PCB. ■ Vertical streaks - Check if the ADF glass or document glass is not stained. Step 1 2 Cause CCD unit failure ADF or document glass failure Check Result Remedy Is the problem solved by replacing the CCD unit. Yes Replace the CCD unit. Is the problem solved by Replace the scanner unit. replacing the scanner Yes unit. ■ White vertical streaks - Check if the ADF glass or document glass is not stained. Step 1 2 Cause CCD unit failure ADF or document glass failure Check Result Remedy Is the problem solved by replacing the CCD unit. Yes Replace the CCD unit. Is the problem solved by Replace the scanner unit. replacing the scanner Yes unit. 3-79 Confidential