HP 1055CMHP - Manual (Page 140)

Service Calibrations
5-24
HP DesignJets 1050C and 1055CM Printers Service Manual
Carriage Height Calibration
The purpose of this Service Calibration is to adjust the distance
between the Carriage Assembly and the Center Platen. This
calibration is necessary in order to prevent problems like Printhead
crashes.
Perform the Carriage Height Calibration whenever:
n Carriage is disassembled or replaced.
n Center Platen is disassembled or replaced.
n Continuous Printhead Crashes.
Perform the Carriage Height Calibration as follows:
NOTE The procedure should be carried out using the Carriage Height
Tool (See Figure 1 below) that came with the new Carriage
Assembly or Center Platen Assembly.
Figure 1
Carriage
Height
Tool