NCR 7800, User Manual, Page: 86 / 112

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During operation, the following functions are continuously
monitored.
•
Motor speed
•
Laser presence or absence, as appropriate
•
Stepper motion
A real-time diagnostics error forces a power cycle in order to
determine if the failure is permanent. Power-up diagnostics
then occur automatically.
The following tests are performed after the Diagnostic Mode
tag is scanned. A good read tone (three beeps) confirms each
tag read, and the status LED flashes during the tests. Quit the
Extended Diagnostics Mode by scanning the Abort tag or
power cycling the unit.
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Hex 2 EIA-232-D communication test. See EIA-232-D Turnaround Instructions.
Hex 3 EIA-232-D communication option. Displays until you power cycle, reset, or
scan another tag.
Hex 4 All dots in each character position are
displayed one at a time.
Hex 5 Firmware part number (U7 on Combo board).
Hex 6 EEPROM version number programmable.
Hex 7
Power-up message.
Hex 8
"Display Controller Part # n"
Hex 9
All characters, one at a time, in every
character position. Repeats until you power cycle, reset, or
scan another tag.
Real-time Diagnostics
Extended Diagnostics