Fairbanks PTR-3950 Instruction Manual - page 16
Fuse Replacement
To replace the fuse:
• Remove AC power to the printer and open the printer as described above.
• The fuse is located on the power supply board. Remove the old fuse.
• Install a new fuse and reassemble the printer.
• Perform a self-test to verify operation and settings.
Replace the power supply board
To replace the power supply board:
• Remove AC power to the printer and open the printer as described above.
• Disconnect the cable from the AC power switch to the power supply board.
• Disconnect the cable from the power supply board to the PC Board.
• Remove the 4 screws that secure the power supply board to the base of the
printer.
• Replace the power supply board and secure with the 4 screws.
• Replace all of the cables and close the printer.
• Perform a self-test to verify operation and settings.
Replace the AC power switch
To replace the AC power switch:
• Turn off power to the printer and open the printer as described above.
• Remove the wire from the back of the switch. Note the color and position of
each wire on the switch.
• Press the lock tabs on the top and bottom of the switch and slide the switch
out the back of the enclosure.
• Slide the new switch into the enclosure from the back. Press it into place until
the locking tabs snap onto the enclosure.
• Reconnect the wires to the back of the switch.
• Close the printer.
• Perform a self-test to verify operation and settings.
Replace the power connector/line filter
To replace the power cord connector/line filter:
• Turn off power to the printer and open the printer as described above.
• Remove the wire connectors on the back of the line filter. Note the color and
position of each of the wires.
• Remove the 2 screws holding the line filter in place. These are removed from
the back of the printer.
• Remove the old filter and replace with a new one.
• Secure the new filter with the two screws and reconnect the wires.
• Close the printer.
• Perform a self-test to verify operation and settings.
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50203 / SJ4780 Issue #4