Brother International MFC 8890DW Service Manual - Page 122
All black, Is the FG harness ASSY
UPC - 012502622673
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■ All black Step 1 2 3 4 5 6 7 Cause Check Result Remedy Corona wire failure Are the electrodes on the drum unit and machine body dirty? Clean both electrodes. Yes (Refer to Fig. 3-2, Fig. 3-3.) Is the corona wire damaged? Yes Replace the drum unit. Scanner harness of the laser unit connection failure Is the scanner harness of the laser unit connected securely? Reconnect the scanner No harness of the laser unit. FG harness ASSY connection failure Is the FG harness ASSY between the laser unit and main PCB ASSY connected securely? Reconnect the FG harness No ASSY between the laser unit and main PCB ASSY securely. HVPS PCB failure Is the problem solved after replacing the HVPS PCB ASSY? Replace the HVPS PCB Yes ASSY. Main PCB failure Is the problem solved after replacing the main PCB ASSY? Replace the main PCB Yes ASSY. Laser unit failure Is the problem solved after replacing the laser unit? Replace the laser unit. Yes 3-50 Confidential