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Service Calibrations

4-2 HP Designjet T 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. For instructions to enter the service calibrations menu, see

Entering

the Service Calibrations Menu on page 4-4.

1 Scan Axis Calibration. See

Scan Axis Calibration on page 4-4.

The purpose of this Service Calibration is to carry out a PWM check, and

calibrate the int

ensity of the Line Sensor.

2 S

ervice Station Calibration. See

Service Station Calibration on page 4-5.

The purpose of this Service Calibration is to calibrate the Drop Detector

(located

in the Service Station) in relation to the Carriage Assembly.

3 P

aper Advance Calibration. See

Paper Advance Calibration on page 4-6.

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 Dr

op Detector Calibration. See

Drop Detector Calibration on page 4-12.

The purpose of this Service Calibration is to calibrate the Drop Detector

(located

in the Service Station) in relation to the Carriage Assembly.

5 L

ine Sensor Calibration. See

Line Sensor Calibration on page 4-15.

The purpose of this Service Calibration is to c

alibrate 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 Ca

rriage PCA. See

Carriage PCA on page 4-18.

The purpose of this Service Calibration is to r

eset the ink short thresholds

after replacing the Carriage PCA.

If ALL the Calibrations need to be performed (for example,

when both the Formatter and the Print Mech PCA have been

replaced), you must perform them in the following order:

 Drop Detector/Service Station Calibration.

 Line Sensor/Scan Axis Calibration.

 Paper Advance Calibration.

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