HP Designjet 4000 Service Manual - Page 144
Service Calibrations, IF AN ASSEMBLY HAS BEEN DISASSEMBLED TO GAIN ACCESS - edge not detected
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Service Calibrations Service Calibrations The Printer has several calibration procedures that must be performed under certain conditions. REMEMBER THAT CERTAIN CALIBRATIONS ARE REQUIRED EVEN IF AN ASSEMBLY HAS BEEN DISASSEMBLED TO GAIN ACCESS TO ANOTHER ASSEMBLY OR COMPONENT. The following is a list of all internal service calibrations available in the Printers. Instructions for entering the service calibrations menu are given on Page 5-3. 1 Scan Axis Calibration ⇒ Page 5-4 The purpose of this Service Calibration is to carry out a PWM check, and calibrate the intensity of the Line Sensor. 2 Service Station Calibration ⇒ Page 5-8 The purpose of this Service Calibration is to calibrate the Drop Detector (located in the Service Station) in relation to the Carriage Assembly. 3 Paper Advance Calibration ⇒ Page 5-9 The purpose of this Service Calibration is to calibrate the nominal advance of the media. This calibration is necessary to control the exact movement of the media in order to avoid print quality problems like banding. 4 Drop Detector Calibration ⇒ Page 5-15 The purpose of this Service Calibration is to calibrate the Drop Detector (located in the Service Station) in relation to the Carriage Assembly. 5 Line Sensor Calibration ⇒ Page 5-16 The purpose of this Service Calibration is to calibrate the intensity of the Line Sensor. An incorrect calibration can result in edge-detection failures during media loading and incorrect reading of prints that are used for alignment or calibration. 6 Platen Blue Line Calibration ⇒ Page 5-20 The purpose of this Service Calibration is to calibrate the blue line which is marked on the Print Platen. 7 Vacuum Calibration ⇒ Page 5-22 The purpose of this Service Calibration is to set the default nominal and real values of the Vacuum Fan. 8 Vacuum Calibration ⇒ Page 5-22 The purpose of this Service Calibration is to reset the ink short thresholds after replacing the Carriage PCA. If ALL the Calibrations need to be performed (for example, when both the HDD and the ISS PCA have been replaced), you must perform them in the following order: Vacuum Calibration. Drop Detector/Service Station Calibration. Line Sensor/Scan Axis Calibration. Paper Advance Calibration. Platen Blue Line Calibration. 5-2 hp designjet 4000 series printer service manual