NCR 7193, Руководство по обслуживанию

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Chapter 4: Troubleshooting 7193 Service Guide
August 1998 36
Problem Possible Causes What To Do
Knife Does Not Operate
Paper jam. Open the receipt cover, inspect the knife, and clear
any jammed paper.
Bad knife home sensor. Check knife sensor with an ohm meter at its
harness and test point.
Replace the knife home sensor.
Printer not configured for knife. Check the switch settings.
Knife motor sensor not plugged
in. Check connections to the PC Board.
Failure of the knife motor or
sensor. Check knife motor by testing Hex FETs on PC
board.
Replace the knife motor sensor.
Replace the knife motor.
Note: When the knife test fails, the printer continues to operate, but does not
cut paper.
Problem Possible Causes What To Do
Thermal Printhead
Over/Under Temperature
Operating printer in a room
where temperature is above
recommended temperature. Adjust the room temperature.
Move the printer to a cooler location.
Continuous printing of graphics
(regardless of room
temperature). Reduce the demand on the printer.
Operating printer in a room
where temperature is below
recommended temperature. Adjust the room temperature.
Move the printer to a warmer location.
Note: The printer will shut off when it is over or under temperature. See “Appendix
A: Specifications” for the recommended temperature range.