Seiko Instruments SII Black-and-White Raster Plotter LP-1020 - Manual (Page 245)

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Chapter 14 Troubleshooting
Error log
Each time an error or warning occurs in the device, it is displayed on the
control panel and also the error log information is saved in the internal
memory.
The error log information saved in the internal memory includes
additionally the time when an error occurred, and therefore you can
confirm the error log using the “ERROR PRINT” on the function menu.
This error log information is saved even after the power was turned off.
Classification of Error/Warning
The type of error/warning is classified as follows:
(1) Classification: E (Service Call)
An unrecoverable error that needs the service person's
intervention.
(2) Classification: O (Operator Call)
An error that the operator can take actions to fix.
(3) Classification: W (Warning)
A warning, such as being low on consumables, or that
a data error occurred.
Format of Message
Each error/warning message to be logged if an error or warning occurs
classifies one character (+ space) at the top of the message as the error/
warning identifier.
The log message is composed of alphanumerics and thus it does not
necessarily match the message displayed on the control panel.
The error/warning message registered as log information is prepared in
the format mentioned below.