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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.
Summary of Contents for Phaser 840
Page 46: ...36 Phaser 840 Color Printer ...
Page 95: ...Service Guide 85 Clearing PostScript NVRAM menu item ...
Page 96: ...86 Phaser 840 Color Printer ...
Page 121: ...Service Guide 111 Figure 1 Cabinet FRUs 7 5 6 8 1 2 4 0388 21 3 ...
Page 125: ...Service Guide 115 Figure 3 Paper path FRUs 0388 16 2 1 5 11 10 9 12 6 4 3 7 13 8 ...
Page 127: ...Service Guide 117 Figure 4 Motors and fans FRUs 0388 14 7 4 3 5 6 2 1 ...
Page 129: ...Service Guide 119 Figure 5 Circuit boards FRUs 4 3 5 2 1 9 7 6 8 10 11 13 0388 13 12 ...
Page 131: ...Service Guide 121 Figure 6 Solenoids and clutches FRUs 4 5 3 2 1 0388 23 ...
Page 137: ...Service Guide 127 Figure 9 High capacity PaperTray 0388 65a 1 2 ...
Page 142: ...132 Phaser 840 Color Printer ...
Page 154: ...144 Phaser 840 Color Printer ...