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Service mode functions
Service menu
The SERVICE menu is PIN-protected for added security. Only authorized service people have access
to the SERVICE menu. When you select SERVICE from the list of menus, the product prompts you to
enter an eight-digit PIN number. The PINs for the HP Color LaserJet Enterprise CP4020-CP4520 Series
are 11402509 and 11452509.
1. Press the Home
button.
2. Press the down arrow
to highlight SERVICE, and then press the OK button.
3. Enter the eight-digit PIN using the alphanumeric keypad.
4. Press the OK button to enter the PIN and open the SERVICE menu.
The following menu items appear in the SERVICE menu:
CLEAR EVENT LOG This menu item allows you to clear the event log.
CLEAR BOOTLOADER PASSWORD This menu item allows you to clear the bootloader password if
it has been lost.
TOTAL PAGE COUNT The page count stored in NVRAM and displayed on the
configuration page represents the number of pages that the
formatter has formatted (engine test prints are not included in
this number). If it becomes necessary to repair a product by
installing a DC controller PCA, you must set the page count so
that it represents the age of the print engine rather than the age
of the DC controller PCA. When you press either the up arrow
or down arrow to change the value of the first digit, the
prompts are changed to indicate an acceptable range and the
appropriate value.
MONO CYCLE COUNT After replacing the formatter, use this item to reset the mono
page count so that the figure continues to represent the page
count for the product engine. The page count that is stored in
NVRAM and printed on the configuration page represents the
number of pages that the formatter has formatted (not
including engine-test prints). If you install a new formatter when
repairing a product, use this menu item to reset the page count
to the previous value. In this way, the page count reflects the
number of pages that the engine has printed rather than
restarting the count for the new formatter. The page count is in
two categories: total mono pages and total color pages.
COLOR CYCLE COUNT After replacing the formatter, use this item to reset the color
page count so that the figure continues to represent the page
count for the product engine. The page count that is stored in
NVRAM and printed on the configuration page represents the
number of pages that the formatter has formatted (not
including engine-test prints). If you install a new formatter when
repairing a product, use this menu item to reset the page count
to the previous value. In this way, the page count reflects the
number of pages that the engine has printed rather than
restarting the count for the new formatter. The page count is in
two categories: total mono pages and total color pages.
420 Chapter 3 Solve problems ENWW