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Operational Procedures
Page 30 100-88002 Rev B
Level 0 Diagnostics
Level 0 diagnostics are only run at power up, e.g. when power is first applied. These
diagnostics perform the following tasks:
Power On
1. Basic System Integrity
2. Vector Integrity
3. RAM Test
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.
7. Start Normal Firmware
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.
12. Cover Closed Check
13. Knife Home
14. Paper Present
15. Clear Paper Path.
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 Diagnostics button in the side of the
printer while the power is applied. The FAULT Indicator comes on, and the READY
indicator blinks. 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. If the load fails, reset the printer by removing
the power and restarting it, and then try again.
Note: In this download mode, the printer will only accept data on the serial port. A
second level loader, described in more detail in the command section of the
Epic
880
TM
OEM Integration Manual
, supports the USB interface.