Self-Test Function Descriptions; Boot Block Program Verification; Control Program Verification; Font Module Verification - Intermec 6820 Series User Manual

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Chapter 7 Troubleshooting and Diagnostics

Self-Test Function Descriptions

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EEPROM Configuration Errors
Errors related to an invalid configuration block (diagnostic block) produce
13 beeps once, and then the printer suspends. It continues to produce this
symptom, until the configuration block error is corrected. No LEDs light.
This error may be caused by a flash write error or merely lack of proper
printer configuration. If the error cannot be corrected by a reset of the
printer, then the printer needs to be serviced by a qualified technician.
Self-test consists of the following functions.

Boot Block Program Verification

A CRC (Cyclic Redundancy Check) is performed on the bootblock pro-
gram. The calculated CRC is compared to the CRC embedded in the pro-
gram module.

Control Program Verification

A CRC is performed on the control program, which is loaded into writable
flash program memory. The calculated CRC is compared to the CRC em-
bedded in the program module. The results of this test are printed on the
self-test report.

Font Module Verification

A CRC is performed on the font modules, which are loaded into writable
flash font memory. The calculated CRC is compared to the CRC em-
bedded in the program module. The results of this test are printed on the
self-test report.

A2D Check

Current reading of the A2D sources are performed, and the results are
printed on the self-test report.

Nonvolatile Diagnostic Memory Verification

A CRC is performed on the area of the nonvolatile diagnostic memory
that has a CRC over it. The results of this test are printed on the self-test
report.

Nonvolatile Diagnostic Memory Update

The nonvolatile diagnostic memory is updated from the nonvolatile diag-
nostic memory data shadowed in memory.
6820 Series 80-Column Printer User's Manual