To Remove The Options Board And Install The Usb Board - NCR 7158 Owner's Manual

8-6 Chapter 8: Universal Serial Bus
7. Return DIP switch No.1 to the original Off (down) position.
8. When you're finished, plug the printer in again. The LED remains
on without blinking.
The printer is now operational. You can print out a diagnostics form to
verify that the boot and flash versions of the firmware have been
updated. (See Owners Manual for printing the diagnostic form.)

To remove the Options Board and install the USB Board:

You'll need a No.1 Phillips screwdriver to complete this task.
Warning: Electrostatic discharge could damage the USB Board.
Wear a grounded wrist strap and use a static mat or other ESD
protected work surface when handling electronic components.
1. Starting with the power cable, disconnect all cables from the
printer.
2. Turn the printer over onto its top.
3. Remove the two screws that secure the Top PCB Cover (Options
PCB Cage) and pull the cover up and off.