Troubleshooting; System Power-Up Sequence - Tektronix Phaser 380 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 a 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 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 by
both the print engine (68K) and PostScript (29K) processors. The two
status LEDs at the rear panel should be blinking.
2.
If POST diagnostics pass, the front panel Power and Error LEDs are
turned on.
3. Front panel Error LED is turned off and the LCD display is cleared.
4.
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 cap/wipe/purge is not detected in its
home position, then the printer assumes it is "frozen" to the
printhead. In this case, an 8 to 10 minute warming cycle occurs to
thaw the cap/wipe/purge assembly and printhead. The
cap/wipe/purge assembly is then moved home.
If the printer is in Print mode, the printhead is moved to its X-axis
home-position and then centered.
Service Manual 6-1