Quick Reference Service Manual
1
HP DesignJet 430, 450C and 455CA Printers
Troubleshooting
Always Use the Latest Firmware Revision.
Always check which firmware revision the printer is using and if necessary update it. To
check the firmware revision, Print the Service Configuration Plot.
Perform a Service Test on the Failed Component/Assembly.
Always perform a Service Test on the component/assembly that you are about to replace, just
to make sure that is the component/assembly that has failed. If the test on that
component/assembly passes, you should NOT replace it.
Perform the Accuracy Calibration.
Perform the accuracy calibration whenever the:
D EEROM is erased.
D Electronics module is replaced.
D Drive roller is removed/replaced.
D Media (XĆaxis) motor is removed/replaced.
D DriveĆroller gear is removed/replaced.
D Cartridge carriage is replaced.
D Mark encoder is removed/replaced.
D Optical sensor is removed/replaced.
How to Solve PrintĆQuality Problems.
Whenever a PrintĆQuality problem appears, it is advisable to print the PrintĆQuality Plot to
help diagnose the problem. The PrintĆQuality Print will help you differentiate between
possible Cartridge errors and other problems such as incorrect frontĆpanel selection, driver or
RIP configuration or mechanical problems.
If Line Sensor has Problems Detecting Media.
Clean the driveĆroller. Perform accuracy calibration. Replace the Carriage Assembly.
If the Carriage is Noisy.
Dirty Carriage bushings. Remove dust particles from the Carriage bushings and from the
slider rod along which the Carriage moves. Apply lubricant to the slider rod. Make sure that
the belt is correctly positioned on the YĆaxis motor. Remove dust particles from the Back
Beam and, if necessary, apply grease. Perform Carriage Axis Test.
If the Carriage Assembly has problems parking in the Service
Station.
The trailing cable may be preventing the carriage from reaching the leftĆhand stop. Make
sure that the trailing cable is positioned under
the plastic tabs at the back of the carriage
cover, and not above them. Check and, if necessary, adjust the Carriage height. The Belt is
not correctly positioned over the idler pulley. Check for a faulty bail lever mechanism because
the Carriage may have trouble passing over it.
