Daewoo DPL-400, Operation Manual

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(7) Self-Test function.
DPL-400 has the self-Test function. So you can inspect the function of a printer by
practicing this function before connecting with computer.
Self-Test function has 3 types as follows.
1. When you turn on the power pressing the color select switch, printer
examines the function of a printer and sufficiency of ink of a pen by drawing 4
rectangulars in each color.
2. When you turn on the power pressing the Line feed switch, the printer
contains self-Test routine by printing the characters as follows.
3. When you turn on the power pressing the color select switch and the Line
feed switch simultaneously, printer examines above two functions together.
The result is as follows.