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Phaser 840/850/860/8200 Color Printer - Service Manual
Phaser 860 Power-Up Error Messages and
LED Codes
The Phaser 860 has two sets of tests that are run when the printer is first powered on:
Built-In Self Tests (BIST) and Power-On Self Tests (POST). BIST verifies basic main
board CPU operation and reports failures with rear panel LED blink codes (refer back to
the 840/850 Rear Panel LED Codes for greater detail on blink codes). POST checks
communication paths from the main board CPU to other parts of the main board and other
systems of the printer.
POST testing initializes the front panel and if an error occurs a POST error message will
be displayed on the front panel LCD. POST errors are also displayed using rear panel LED
patterns in case the communication path to the front panel has failed.
Some POST errors are "soft" errors which do not prevent the printer from powering up
completely. These errors are displayed on the front panel for 5 seconds and then the printer
continues through the remainder of POST. Because soft errors do not stop the printer from
powering up, there are no rear panel LED codes associated with them in normal mode.
Most soft errors will also cause the printer to print a Startup Page with the error message
on it. BIST and POST errors are not stored in the fault history logs.
The BIST (Built-In Self Test)
These tests occur immediately at power-up, before the front panel is initialized.
Table 2-2 BIST Rear Panel LED Codes
PS LED
PE LED
Description
1 Blink
and then
off
1 Blink
and then
off
The power supply could not remain regulated when the DC power
was applied so it was shut down. Follow the troubleshooting
procedures for electrical shorts and check the power supply fuses.
On Solid
On Solid
The printer is held in reset mode. Make sure the DIP switches are
all in the up position. This can be caused by a faulty or missing MIG
chip. (In early printers this chip is socketed rather than soldered
down. Make sure it wasn’t accidentally removed instead of the
Printer ID chip.) Try reseating the main board and all it’s
components and remove any unnecessary components (extra
RAM, Hard drive, ROM upgrade). Replace the main board if
required.
1
Rapid
blinking
CPU Bridge and/or PCI bus is not communicating. reseat and then
replace the main board.
2
Rapid
blinking
ROM not responding. Try reseating the main board and all of its
components, replace the Code ROM, if it is socketed and not
soldered down, and then replacing the main board.
3
Rapid
blinking
System hangs during code initialization. Reseat the main board
and all of its components. Replace the main board.
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