General Troubleshooting - Xerox Phaser 8860 Service Manual

Table 51 Printhead Clearance Nominal Values
R# Characteristic Typical Value
1 Tilt To Right Contact Dis- N/A
tance (min)
Transfix Gap Test
This test does not clean the Drum before lowering the Transfix Roller. To prevent contamination
of the Transfix Roller, check that the Drum is clean before running this test.
This tests exercises the Transfix Roller and reports the results. The Transfix Gap test lowers
the Transfix Roller at a lower velocity than the Transfix Drive test to more accurately determine
of the gap between the Transfix Roller and Drum.
Table 52 Transfix Gap Nominal Values
R# Characteristic Typical Value
0 Time to first contact (sec) N/A
1 Loaded average Y-axis fol- N/A
lowing error (mpts)
2 Loaded Y-axis following error N/A
ripple (mpts)
3 Time to last contact (sec) N/A
Diagnostics
Print Engine Check Menu Tests, General Trouble-
Result
Reports the approximate clearance
between the right side of the Printhead
and the chassis.
CAUTION
Result
Reports the time from the load command
to the engine until the drum indicates
pressure roller contact.
Reports the average Y-axis following
error during the Roll With Transfix Roller
Down interval.
Reports the difference between the max
and the min Y-axis following error during
the Roll With Transfix Roller Down inter-
val.
Reports the time from the unload com-
mand to the engine until the drum indi-
cates no further contact.

General Troubleshooting

This section provides troubleshooting procedures for system problems not associated with a
error message or code. For troubleshooting problems associated with an error code or mes-
sage, and information on how to use the troubleshooting procedure tables, see Section 2.
Troubleshooting procedures attempt to isolate a problem to a specific component or subas-
sembly, in some cases including the wiring harness. If you go through a troubleshooting proce-
dure and still are unable to solve the problem, re-read the Theory of Operations for the problem
area and ensure that you understand how that section of the system is supposed to function.
Service Diagnostics provides several tools useful for troubleshooting non-specific problems.
Three of these are especially useful:
• Sub-system Status Reports
• Component Checks
• Diagnostic Fault History
The following overview describes the function and proper application of the each tool.
Sub-system Status
Located in the Exit Path, Scanner, and Doc Handler menus, Report Status reports on the con-
dition of each sub-system. Report Status lists the current sub-system status as reported by.
that sub-system's firmware. Status listings are not stored. If the system reaches Ready, the list
is cleared.
Some applications of status are:
• Provides an initial condition from boot to begin troubleshooting.
• Captures static or dynamic events.
• Confirms diagnostic test results and subsequent repairs.
Component Checks
Located under the Print Engine -> Exercise menu of Service Diagnostics is an extensive suite
of component-level tests that exercise individual electromechanical, thermal, and optical com-
ponents. Use these tests as the primary tool for testing system components.
Occasionally, a troubleshooting procedure refers to a test located in the Print Engine -> Check
menu. The Check Menu contains tests that perform measurements on system components
and report measured values to the Control Panel. These tests are typically used to verify sys-
tem 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 compo-
nents. Use these tests when directed to do so from a troubleshooting procedure.
Diagnostic Fault History
The Diagnostic Fault History utility records a list of engine-generated error events, warnings
are not captured, that occur during diagnostic testing. Use this utility to record error events that
occur while executing tests in Diagnostic Mode. The Diagnostic Fault History utility captures
asynchronous (transient) events only. For static (continuous), or pre-existing events, rely on the
Status utility.
09/2007
6-34
Initial Issue
Phaser 8860/8860MFP Service Manual