1. Remove the I/F cover [A].
  2. Remove the rear cover [A].
  3. Remove the controller box cover [A].
    Red circle: remove
    Blue circle: loosen
  4. Remove the "LINE2" [A] and "LINE3" [B] covers using a screwdriver.
  5. Remove the CCU I/F board and SG3 board [A] from the SG3 interface unit.
    Repeat the same procedure for the second SG3 interface unit.
  6. Remove the SG3 board [A] from one of the CCU I/F and SG3 board assemblies removed in step 5.
  7. Attach the SG3 board removed in step 6 to the other CCU I/F and SG3 board assembly [B].
  8. Attach the boards (CCU I/F board and two SG3 boards) to the SG3 interface unit bracket.
    • Use two screws from the six screws removed in step 5.
  9. Connect the FFC [A] to the FCU.
    • The FFC should be connected at this point (because it is difficult to connect the FFC after installing the G3 interface unit).
    • Connect the FCC in the direction as the photo below.
    • Release the connector lock [A] and connect the FFC, and then lock the FFC.
  10. Insert the tab [A] of the bracket into the.cutout, and attach the G3 interface unit [B].
  11. Attach the screws.
  12. Take the FFC [A] out and connect the CCU interface board connector [B].
  13. Insert the tab [A] and attach the partition board [B].
  14. Reinstall the controller box cover, rear cover and I/F cover.
  15. Make two loops with the telephone cord for each telephone line (LINE2, LINE3). Attach the ferrite core [A] to each telephone line.
  16. Connect the telephone cords to the "LINE2" and "LINE3" jacks.
  17. Attach the clamp [A] as shown in the picture below, and put the cable in the narrow space [B].
  18. Insert the power plug into the outlet. Turn ON the main power of the machine.
  19. Enter the service mode. Set Bit 1 of Communication Switch 16 to "1" (SP1-104-023).
  20. Set Bit 3 of Communication Switch 16 to "1" (SP1-104-023).
  21. Exit the service mode.
  22. Turn ON then OFF the main power.
  23. Print out the system parameter list. Check that "G3" is displayed as an option.
  24. Set up and program the items required for PSTN-2 communications.