NCR 7193, Руководство по обслуживанию

Страница: 55 / 84

7193 Service Guide Chapter 5: Disassembling and Reassembling the Printer
August 1998 49
Replacing the Printhead
The mechanism should be facing you with the printhead area toward you.
Note: Take note of the letter (A-H for early models; A-D, 3-0 for later models) printed on
the heat sink (the part of the printhead which faces the front of the printer). This letter
indicates the printhead resistance and should match the letter printed on the print test. If
these letters do not match, changes in the EEROM need to be made. See “Setting Printhead
Resistance” in the “Diagnostics” chapter for the procedure to change the printhead
resistance.
1. Carefully roll the flat flex cable so that it can be slid into place without tearing.
2. Slide the cable back down through the slot in the right bottom of the mechanism.
3. Place the pin on the left side of the heat sink into its slot in the left side of the frame.
4. Slide the right-hand pin down into its slot.
5. Replace the left support by screwing in the two screws.
6. Snap the printhead into place and check to make sure it is fully seated.
7. Push the flat printhead spring back into position, realigning the snaps on either side.
8. Check that the assembly is free to pivot and that it is centered in position.
9. Replace the knife motor it you removed it earlier.
Removing the Knife Motor
1. Remove the two screws holding the knife motor.
2. Pull the knife motor off of the print mechanism.
Note: The knife motor needs to be removed from the print mechanism to remove the
paper out switch.