System Power-Up Sequence - Tektronix Phaser 550 Service Manual

Chapter
6

System power-up sequence

Troubleshooting
This chapter discusses troubleshooting the printer. Troubleshooting is discussed
with two approaches:
A step-by-step verification procedure that systematically confirms that
particular components of the printer are properly functioning until a
problem is found.
A symptom/cause scheme that lists particular printer failures and
error codes and their possible causes.
The following lists the chain of events that occur when you turn on the printer.
You can follow this list as one means of determining if the printer is operating
correctly.
When the power switch is turned on, these events occur:
The engine control board checks its RAM.
All the engine fans are turned on to ensure they work properly.
The fuser heater (a halogen lamp) is activated to heat up the heated
roller.
The position of each toner cartridge is checked to ensure they are in
their parked positions.
A print engine checks to see that the imaging unit and the paper
feeder are installed.
The engine motors are rotated to ensure that their rotation sensors are
detected.
The transparency film sensor is "tuned" for the amount of infrared
light it emits.
A check is made to determine if any paper is jammed in the printer.
The print engine checks the level of toner in each toner cartridge.
Service Manual 6-1