Troubleshooting; System Power-Up Sequence - Tektronix Phaser 480 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:
1. The front panel LEDs are lighted and remain on until the image
processor board completes its self-tests. The POWER LED remains on
all the time since it is wired to +5 VDC.
2.
The thermal head raised into its standby position if it is out of
position.
3. The transfer roll feed motor energizes and advances the transfer roll
until a yellow band is detected by the transfer roll mark sensors if the
yellow band is not detected at power-up.
4.
The timing belts rotate to bring the paper clamp bar to the paper load
position.
5. The thermal head fans are turned on.
6. The READY LED then blinks while the image processor initializes.
Following initialization, the READY LED is on.
The print engine is initialized. The engine fan and thermal head fans runs
continuously while the printer is on.
Service Manual 6-1