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HP PCL Commands
36 HP DeskJet 600, 700, 800, 900 & HP 2000 Series PCL Developer’s Guide
10.7 Printer Diagnostics
10.7.1 Self-Test
Esc z
Initiates printer self-test, which instructs the printer to perform the following actions:
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Process all data preceding the self-test.
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Perform Esc E reset (ejecting the page if printable data has been sent). Permanent down-
loaded fonts are not deleted.
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Move CAP to the top of form, if not already there.
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Perform the self-test.
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After self-test, move to the top of form, if not already there.
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Resume execution of the user data without data loss (programmable features need not be
saved).
This should be as complete a self-test as the product is capable of performing. If no error is
detected, the printer will remain on-line. If an error is detected, the printer will go to the off-line
state.
In general, this command should not be used in an application. It is intended as a diagnostic
tool for developers and support staff. The HP DeskJet 600/800/900 & HP 2000 Series printers
provide several diagnostic print outs that are user-accessible via the printer front panel.