Tektronix Phaser 840, Quick Reference Manual

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Service Guide 37
Troubleshooting
System power-up sequence
The following lists the chain of events that occur when you turn on a printer. You
can follow this list as one means of determining if the printer is operating
correctly. The exact chain of events depends upon where the printer “believes”
the printhead is positioned. The printer records in NVRAM the last known
position of the printhead and the cap/wipe/purge assembly.
Power switch turned on:
1.
Low-level, power-on self-test (POST) diagnostics are performed. The
two status LEDs at the rear panel should be blinking and the front panel
LEDs are turned on.
2. If POST diagnostics pass, the front panel Error LED is turned off and
the LCD display is cleared.
3.
If the printhead is in either the Standby or Print position:
a.
If the printer is in its Standby mode, the cap/wipe/purge motor is
run to ensure that the cap/wipe/purge assembly activates its home
position sensor. If the printer is in Print mode, the printhead is
moved to its X-axis home position and then centered.
b. The process motor is rotated to tilt the printhead forward (if not
already forward), rotate all the rollers to their ready positions,
disengage the transfix roller, and lower the maintenance drawer
blade and wiper.