4-2
Diagnostic Tests and Utilities
HP Designjet 4000/4020 Printer Series Service Manual
Introduction
This chapter explains how to use the Diagnostics Tests and Service Utilities
and what to do if any of the tests fail.
If possible, always perform a Diagnostics Test on the
component that you are about to replace, just to make sure
that is the component that has failed. If the test on that
component passes, there is no need to replace it.
Diagnostics - Self Test
Initialization Sequences
Whenever the Printer is switched ON, it automatically performs a series of
internal self tests and mechanical initialization sequences. If any of the parts
fail, a system error will appear and you should consult Chapter 2 - System
Error Codes.
Phone Support
In certain circumstances, a Call Agent can try and troubleshoot
the Printer by requesting the Customer to perform a
Diagnostics Test via the phone. Using this process, it can be
determined whether the Printer requires any on-site
maintenance.
Remember that the Key combination for the Customer to Enter
the Diagnostics Tests and Utilities is different from the one that
the Customer Engineer will use.
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