Brother International MFC 8890DW Service Manual - Page 149
SCANNING IMAGE DEFECT TROUBLESHOOTING, 12.1 Image Defect Examples
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12. SCANNING IMAGE DEFECT TROUBLESHOOTING 12.1 Image Defect Examples Light Faulty registration Dark Completely blank Vertical streaks Fig. 3-11 White vertical streaks 12.2 Troubleshooting Image Defect Image defect related problems are end user recoverable if following the User Check items. If the same problem occurs, follow each procedure in the order of the number described in the Step column in the tables below. ■ Light on the page - Check whether the setting of the contrast does not become light. 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. 3-77 Confidential