Xerox Phaser 8860 Service Manual page 233

Print Engine Function Menu
This submenu contains a group of functions that either perform higher-level exercise functions
involving multiple print engine subsystems, or special purpose functions requiring software
support, such as working with NVRAM.
Table 6 Print Engine Function Menu
Function Description
Initialize Mechanism Performs a simplified version of the power-up mechanical
initialization sequence.
Print DMU Blot Raises the DM unit up against the drum, then does a Chase
sequence. The result is an oil print of the contact of the DM
unit with the drum (about 2/3 down the page).
Display Fault History Displays the contents of the Fault History NVRAM store.
Access PE NVRAM Parameters A restricted function that provides read/write access to
selected PE NVRAM parameters.
Clear Fault History A restricted function that clears the Fault History NVRAM
store.
Clear PS NVRAM A restricted function that clears the PS NVRAM to be rebuilt
with defaults at the next power-up.
Clear PE NVRAM A restricted function that clears the PE NVRAM to be rebuilt
with defaults at the next power-up.
Set PE NVRAM to Defaults A restricted function that sets the PE NVRAM parameters to
the default values.
Print Engine Check Menu
This submenu contains a group of tests that perform specific measurements on portions of the
print engine and report measured values to the Control Panel. These tests are typically used to
verify system operation during manufacture. Details of the function and output of these tests is
provided in the Print Engine Check Menu Tests
Table 7 Print Engine Check Menu
Test Menu
• Check All
• Activators Menu
• Shafts Menu
• Fans Menu
• Heaters Menu
• Paper Path Menu
• Drive Menu
• Drum Menu
• Motors Menu
• Misc. Menu
Initial Issue
Phaser 8860/8860MFP Service Manual
discussion.
Description
Each of the tests listed under the submenus
contained in the Check Menu are described in
detail in Print Engine Check Menu Tests.
Print Engine Check Menu Tests
This submenu within Service Diagnostics contains a group of tests that perform measurements
on print engine components and report measured values to the Control Panel. These tests are
typically used to verify system operation during manufacture. However, in some instances, the
values returned by these tests can help to locate system malfunctions or indicate excessive
wear in selected components. To access the Check Menu tests, enter Service Diagnostics, go
to the Print Engine Menu, and select Check Menu.
When referred to one of these tests from a troubleshooting procedure, locate the table associ-
ated with the test for typical values. In many of these tests, baseline data was not available at
the time of publication. Therefore, these tests are included for reference and typical values are
shown as not available (N/A). As data becomes available, periodic updates to this manual will
incorporate the new data. All measurements from tests that move paper through the printer
were collected using 24 lb. bond paper.
NOTE: Collecting 2 or 3 samples of the test data is recommended before deciding on a course
of action. Many of the tests rely on mechanical positions and slight changes can effect the
results. Ensure that media is loaded, and adequate ink and maintenance kit life remain. The
diagnostics routines are not designed to address all of these conditions consistently. If a test
result differs significantly from the typical values defined in the following tables, check the entire
subsystem containing the problem component.
Each test included within the submenus listed below is described in detail in the following sec-
tions.
• Check All, manufacturing use only.
• Activators Menu
• Shafts Menu
• Fans Menu
• Heaters Menu
• Paper Path Menu
• Drive Menu
• Drum Menu
• Motors Menu
• Misc. Menu
NOTE: The Check All selection runs all check tests, taking 1.5 hours to complete and is not for
use by field technicians.
Activators Menu
Check Menu Activator tests measure DC (i.e. steady state), parameters and do not provide
information on transient phenomenon, such as rise/fall times, inductive overshoot, change in
inductance due to core/clapper pull in, etc.). The parameters measured do not verify mechani-
cal function. An audible noise generated by most activator tests is one indication of mechanical
activity. Observable motion is another. Tests the selected component and reports the value of
the characteristic defined in the following tables.
09/2007
Service Diagnostics, Print Engine Check Menu
6-13
Diagnostics