Fuji Xerox Phaser 5500, Service Manual

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A-24 Phaser 5500 Printer Service Manual
Mode Select Port
The Mode Select Port, accessible from the Rear Panel, is a 6-pin header used to place
the printer in one of five operational modes or to reset the Image Processor Board.
These modes are set by connecting one or more pins to ground. The six pins are
arranged in numeric order with Pin 1 at the top of the connector. Pins 1 and 6 are tied
to a common ground with the Rear Panel. Pins 2 through 5, when grounded, set the
printer to the mode indicated in the following table.
Caution
To reset the I/P Board, momentarily ground pin 5, then immediately re-open the
connection. Grounding pin 5 for more than a few seconds could damage the
processor.
■ Reset is a hardware reset of the Image Processor Board.
■
Customer Mode is the normal mode for printing. The Serial Debug Port is
receiving PostScript back channel information.
■
Service Mode inhibits printing of the Startup page and causes POST to treat all
errors as Hard Faults. See "Power On Self Test (POST)" on page 3-4. Service
mode also switches the Serial Debug Port from PostScript back channel
information to the printer’s operating system console.
■ Disaster Recovery mode instructs the printer to load only its operating system
bypassing the networking and PostScript code. The Serial Debug Port is
receiving PostScript back channel information.
■
Developer mode inhibits the execution of POST and allows for the introduction
of startup scripts. Not typically used for servicing procedures.
■
Customer Debug mode instructs the printer to boot normally but switches the
Serial Debug Port from PostScript back channel information to the printer’s
operating system console.
Mode Select Port Settings
Mode 1 2 3 4 5 6
Printer Reset GND GND GND
Customer GND GND
Service GND GND GND GND
Disaster Recovery GND GND GND GND
Developer GND GND GND GND GND
Customer Debug GND GND GND