Power On Self Tests - Xerox Phaser 8860 Service Manual

Power On Self Tests

This section covers the start-up, Power On Self Test (POST), Service Diagnostics, and power
supply operations of the system to aid in troubleshooting problems not associated with a
reported error. For problems associated with an error message or code, see
Troubleshooting. Troubleshooting tips are available at: www.xerox.com/support.
Check the main menu for current data and historical error data.
• Status Page
• Usage Profile
• Fault History
• Diagnostic History
Power-Up Error Messages and LED Codes
The system has three sets of tests that are run when first powered on:
• Built-In Self Tests (BIST)
• Power On Self Tests (POST)
• Print Engine Self Tests (PEST)
NOTE: BIST and POST errors are not stored in the fault history logs.
In addition to the numeric error codes appearing on the Control Panel display, the system uses
the Control Panel, PS, and PE LEDs to communicate errors.
and PE LEDs on the Electronics Module.
Figure 1 PS and PE LED Locations
Initial Issue
Phaser 8860/8860MFP Service Manual
BIST Error Reporting
BIST verifies basic Electronics Module CPU operation and reports failures using PS and PE
LEDs. These LEDs are located on the Electronics Module directly above the Scanner Assem-
bly connection. BIST tests occur immediately at power-up, before POST tests are run or the
Error Message
Control Panel is initialized.
The following table defines the blink patterns associated with a failure:
PE LED
Off or 1 blink,
then Off
On solid (dim) On solid (dim)
Off
1
Figure 1 shows location of the PS
2
3
POST Error Reporting
POST checks the communication paths within the Electronics Module and to other various sys-
tem components
POST testing initializes the Control Panel, and in most cases if an error occurs, a text message
is displayed on the Control Panel along with an LED blink code flashing on all three LEDs
(Control Panel LED, PS LED and PE LED). If initialization of the Control Panel fails, POST
errors will still report using the LED blink patterns. The sum of the flashes equal the error code.
If the code has more than 5 flashes, there is a brief pause between each set of 5 flashes to
make them easier to count. After all flashes occur within the code, there is a long pause and
then the flash pattern repeats.
"Soft" POST errors, that do not prevent the system from powering up completely, are displayed
on the Control Panel for 5 seconds, and then the system continues through the remainder of
POST. There are no rear panel LED codes associated with soft errors. Most soft errors will
cause the system to print a Startup Page with the error message on it.
09/2007
2-3
Table 1 BIST Blink Pattern Error Reporting
PS LED Description
Off or 1 blink, The power supply could not remain regulated when DC
then Off power was applied so it shut down. Follow the troubleshoot-
ing procedures for electrical shorts (see
shooting) and check the power supply fuses.
Initialization failure. The system is held in reset mode. This
can be caused by an Electronics Module fault or a +3.3 V
power supply failure. See
PS and Control Boot loader memory test failure. Ensure the systems RAM is
Panel blink at 1/ properly seated and that the correct RAM type is installed.
2 sec. intervals
Rapid Blinking The CPU and/or PCI bus is not communicating. Reboot the
system. If the error persists, replace the Electronics Module
(REP 5.0.5).
Rapid Blinking ROM not responding. Reboot the system, if the error still
occurs, replace the Electronics Module
Rapid Blinking System hangs during initialization
1. Unplug all connections to the Electronics Module.
2. Plug in the Power Cable.
3. Power on the system.
4. If the problem persists, reseat the RAM Modules.
5. Replace the Electronic Module
Electrical Trouble-
Electrical Troubleshooting.
(REP 5.0.5).
(REP 5.0.5).
Error Messages and Codes
Power On Self Tests