HP deskjet 600 User Manual

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.