Troubleshooting; System Power-Up Sequence - Tektronix Phaser 740 Service Manual

This topic 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.

System power-up sequence

The following lists the chain of events that occur when you turn on the printer. 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.
The 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.
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.
After the fuser reaches its idle temperature the printer is placed on line in its
READY state.
The print engine is initialized. If the startup page feature has not been disabled and no
error occurred with the printer, the printer prints a startup page.

Troubleshooting

Service Guide
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