HP DESIGNJET 3D, Service Manual

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-3
Overview
What happens when...
Powering up:
Power Switch turned to ON
Chamber lights (dim mode), display backlight
and fans turn on. Material bay drive homes.
Performs Power On Self Test (POST).
POST looks at voltages, checksum
and memory, etc.
Performs basic hardware setup such
as checks for number of material
bays and loads gantry parameters,
etc.
Once printer software is loaded to
RAM the controller runs the POST
test again.
Controller receives updated
parameters from SBC.
Power enabled to the XYZ motors, via
the XP command.
• Chamber lights on (full power)
• Load globals
• Door locks
• Performs “Calibrate” (home) sequence:
1. Moves Z stage down to Z EOT
sensor
2. Moves head to X home (BOT) sen-
sor
3. Moves head to Y home (BOT) sen-
sor
4. Moves head to Y EOT sensor
Head and chamber heaters begin to
heat up, via the th, tr and tx
commands
BIOS starts and loads the OS
(operating system) from the
hard drive to the SBC RAM.
OS boots - performs check
disk (chkdsk) and loads Linux
OS from hard drive to RAM.
Loads printer software from
hard drive to RAM. SBC send
second reset (in) command to
controller.
Loads parameters to controller
(Coldfire chip) (e.g. extrusion
parameters).
SBC enables power to XYZ
motors
“Calibrate” (home) by issuing
move commands to the
controller
After chkdsk is complete,
“Copyright” screen will
be displayed.
“Starting Up”
“Initializing” is
displayed.
“Starting Up”
“Calibrating” is
displayed
“Idle” is
displayed
Controller
SBC
Commands head and chamber to
heat to “Idle” temperature (sets
temperatures)