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CBM-202PC-04 User's Manual
Print head up/down is detected by a head-up sensor built in the printer so that the printer will not be energized
on with the head up.
The circuit is "opened" when the print head is up, and "closed" when down.
When the print head is up, HEADUP (Pin 88) of the CPU is turned to "High," and if the printer is printing, it
will immediately stop printing and output an error.
It resumes printing when the print head is down.
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