Operational Procedures
43-06955 - Rev Q Page 25
Level 0 Diagnostics
Level 0 diagnostics are only and always run at power up, e.g. when power is
first applied. These diagnostics perform the following tasks:
Power On
1. Basic System Integrity
4. Flash Boot Loader Integrity
5. Flash Firmware Integrity (NOTE: If the firmware is corrupted, the printer will remain in boot load.)
6. USB Controller Diagnostics and verify.
8. Verify Configuration Integrity
9. Interface Configuration
10. File System Integrity
11. Start Kernel, Verify Multitasking, Start Tasks
Once the kernel is running, the following tests must pass to allow operation. However, if any
test fails (except the knife home test), the remaining tests will generate recoverable faults and
normal operation will start as soon as the fault is cleared. These tests are also run when
operation is resumed from OFF.
16. Place Printer On-line, Start Normal Operation
The first phase of testing consists of step 1-5, and determines that the boot
loader is accurate and the printer firmware is correct. Tests 1 through 4
produce non-recoverable errors if they fail, in which case the power must be
removed from the printer and the printer returned for service. If the boot loader
is intact, but the main firmware is corrupted, the printer automatically enters
boot loader mode, where the firmware can then be reloaded into the printer.
Boot Loader Mode
The boot loader may be entered during normal operation through special
commands. Normal boot load operation is by manually starting boot load
mode. Boot loader mode can be entered in one of three ways: (1) when Level
0 Diagnostics finds that the firmware check (also known as a cyclical
redundancy check, or CRC) is bad, (2) manually, or (3) through the use of a
special boot load command.
To manually enter the boot loader, hold the Test button in the side of the
printer while applying the power. The Fault LED will come on, and the READY
LED will blink. At this time, the firmware boot program is operating and the
boot load file may be sent to the printer. When the printer receives the boot
load file, the printer will automatically restart if the firmware load was
successful. If the load fails, the printer will remain in boot load mode and
should be reset by removing the power and reapplying it. The user should
then reattempt to load the boot load file.
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