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7-4 Adjustments/Calibrations

ACCURACY CALIBRATION

Performance of these accuracy procedures allow you to either restore the plotter to the facto-

ry accuracy settings or to recalibrate the plotter to the current environment. Accuracy calibra-

tion constants are stored in the plotter EEROM. When performing the accuracy calibration

from the ªService Testº menu, the factory correction value will be recalculated. This will be

the new factory default calibration value. The calibration performed from the ªUtilitiesº

menu will calculate a new user calibration value. This value will override the factory value

until the plotter is reset from the ªResetsº submenu. Once reset, the plotter will use the factory

default until another user calibration is run.

Check the accuracy calibration whenever the:

Before performing an accuracy calibration, run a configuration plot. An accuracy calibration

is needed if the distance between the centers of the ªXº marks on the configuration plot is not

500 mm (20 in.) 1 mm (0.04 in.) under normal environmental conditions. Media expansion

and thickness can affect endpoint accuracy. The plotter endpoint accuracy is specified on ink-

jet polyester film only, at 0.2% of the specified vector length.

If the measured accuracy, media thickness, or environmental conditions vary greatly from

the factory standards, recalibrate the plotter using the following procedure.

To perform the accuracy calibration, use the following steps:

Note

‘User’ and ‘service’ accuracy calibration procedures are similar. Follow the

appropriate ‘user’ or ‘service’ noted paths in the steps.

1. Place a sheet of media over the top of the plotter for 10 minutes to let it stabilize to the

environmental conditions. Use a sheet approximately 24 x 36 inches (61 x 91 cm).

Roll media may also be used. Use polyester film when performing the Accuracy

Calibration from the ªServiceº menu. If using inkjet polyester film, load the film

with the matte (dull) side down.

2. Load the media. If using D-size media, load the short edge as the leading edge in

C2858A plotters and the long edge as the leading edge for C2859A plotters. The

C2859A can also use E-size media. Both plotters can use polyester film roll media

for this procedure.

HP 650C User Manual

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