HP LaserJet M9040/M9050 Service Manual - Page 395
Scanner controller PCA, and enter the PIN M9040 MFP: 04904008, M9050 MFP: 04905008
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Page 395 highlights
Table 7-11 All scan locations Blank page Defective scanner controller board. Defective copy processor. Replace scanner controller board. Replace the copy processor EIO. Vertical lines Defective scanner controller board. Defective copy processor. Replace scanner controller board. Replace the copy processor EIO. Horizontal lines Defective scanner controller board. Defective copy processor. Replace scanner controller board. Replace the copy processor EIO. Moire patter The default copy settings might not be optimal for some half-toned images. Copy using the Printed picture setting (use the control panel to open the Copy menu, and then touch Optimize Text/ Picture). Scanner controller PCA The product scan engine calibrations are stored on the scanner controller board (SCB). If the SCB needs to be replaced, back up the calibrations by copying the settings to the hard drive: 1. Touch Administration. 2. Touch Service, and enter the PIN (M9040 MFP: 04904008, M9050 MFP: 04905008) 3. Touch Scanner Settings. 4. Touch Save Settings. NOTE: Always back up the scanner settings before performing any scan engine calibration. Then you can restore the settings and start over if you encounter problems. NOTE: A service label is located inside the flatbed lower front cover to record the calibration values. If you enter new calibration values, download an new service label, record the new values, and place the new label over the old one. ENWW Image-formation troubleshooting 377
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