HP Color LaserJet 8500/8550_Service Mode & Adjustments
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SERVICE MODE MENU
The Service Mode Menu can be entered only by pressing the
left side of the ITEM and the VALUE keys at the same time.
NVRAM SETTING (nonvolatile random-access memory setting) menu
is provided to replace values that might be lost when a formatter board or
control board is replaced in the field.
FORMATTER DIAGNOSTICS menu is provided for manufacturing and
field service personnel to perform specific diagnostic tests on the formatter
board and its related components.
* Service personnel can pinpoint problem areas on the
formatter board for replacement or for tracking defects.
* The operator can choose which tests are enabled and
disabled during execution, whether the tests run once or continuously, and
whether the test sequence stops upon failure or continues despite failure.
* A fault log is implemented within formatter diagnostics to
record errors for review.
* Because many of the formatter diagnostic tests are
destructive memory tests, a special key sequence is used to enter the mode. A
message warns service personnel that the printer is about to perform
destructive memory tests.
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