Personal Computer User Manual

When you continue the test, the program checks that the
printer is responding correctly. This test detects whether the
printer is offline or whether an interface error exists. If no errors
occur, the computer sends a repeating sequence of ASCII
characters and bit-image data to the printer until you press any
key. The pattern looks like this:
The text data includes all the characters commonly used by
programs that require foreign languages or graphic characters.
If your printer prints different characters than you see in the
illustration, you may need to be careful with certain software.
The bit-image data is sent to the printer using a command
(ESC K) compatible with Epson and IBM printers.
Note
Even if the test runs only for a short time, your printer may
store many characters in its buffer. To stop printing, set the
printer offline.
C-32
Performing System Diagnostics