5-2
Service Calibrations
HP Designjet 4000/4020 Printer Series Service Manual
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 Carriage Setup ⇒ Page 5-23
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:
îš„ Vacuum Calibration.
îš„ Drop Detector/Service Station Calibration.
îš„ Line Sensor/Scan Axis Calibration.
îš„ Paper Advance Calibration.
îš„ Platen Blue Line Calibration.
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