User's Manual Part 3

Chapter 6 — Troubleshooting
104 6822 Series 80-Column Printer User’s Manual
3 Press the Reset button to start the POST. When the POST starts,
green Power LED will come on followed by a single beep indicating
that the printer is active.
The printer emits beeps and flashes the LEDs to indicate the cause of any
POST errors. POST error codes are described in the following table.
Fatal Errors
There are two types of fatal errors, flash write errors and EEPROM
configuration block errors. These errors are extremely rare, but measures
are built into the printer diagnostics to track possible occurrences.
Flash Write Errors
Errors related to writing or erasing flash are critical errors. These errors
cause the printer to stop all processing and produce an LED code and a
sequence of beeps. The LED code indicates the address of the segment
where the error occurred in octal notation.
Note: After the test is completed, all LEDs turn off and the
printhead moves to the home position. Only runtime errors or
fatal errors are reported until the next time the printer is reset
and POST is performed.
POST Error Codes
Long
Beep
Short
Beep
Paper
Out
Head
Jam
Low
Batt
Power Meaning
0 1 Off Off Off On Operational
0 0 Off Off Off Off No Power
0 0 Off Off Off On Control program Initial Program Load (IPL)
successful
1 1 Off On Off On Invalid CRC on boot block
1 2 Off On On On Invalid CRC on control program or program not
found
1 4 Off Off Off On Upper 192K RAM failure
1 4 Off Off On On Upper 64K RAM failure
0 0 On Off Off On Diagnostic mode command check
1 5 On Off On On Diagnostic flash memory check failed or is not
initialized
1 5 On On Off On Diagnostic memory write failure
0 0 OnOnOnOnControl program IPL