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Maintenance and Service 89
6
888Xi Advanced Electronics Instruction Manual Section 5: Maintenance and Service
PN 51-6888Xi December 2012
6. Position the new front panel assembly in place and reinstall the hinge pin. Ensure the hinge
p
in is fully seated into the 6888Xi cover.
7. The keypad window on the new front panel may be supplied with interior and exterior pro-
tective membranes. Remove the protective membranes prior to final assembly and use of
the 6888Xi enclosure.
8. Reconnect the 10-pin ribbon cable from the I/O Board.
9. Reconnect the 14-pin ribbon cable from the Power Supply Board.
10. Swing the 6888Xi cover up in place and tighten the four screws.
11. If necessary, reconfigure the appearance of the main display. Refer to Section 3:
Configuration, Startup and Operation.
Replacing Front Panel Assembly without CPU Board
1. Loosen the four screws securing the 6888Xi cover. The screws are captive and do not need to
be completely removed.
2. Swing the 6888Xi cover down to expose the inner components.
3. Disconnect the 14-pin ribbon cable going to the Power Supply board. A new cable is sup-
plied in the replacement kit and should be used if the old one is damaged.
4. Disconnect the 10-pin ribbon cable(s) going to the I/O Board(s). One new cable is supplied
in the replacement kit and should be used if either of the ribbon cables are damaged.
5. Remove the wire hinge from the right side of the 6888Xi cover. A paper clip or similar device
can be inserted into the hole on the left side of the cover to push the hinge out of the cover.
A new hinge pin is supplied in the replacement kit and should be used if the old one is dam-
aged.
6. Place the front panel assembly on the bench. Remove the 4 screws securing the CPU board
to the front cover.
7. Lift the CPU board off of the front cover using care not to damage the board.
8. Disconnect the keypad overlay ribbon cable from the CPU board. Discard the used front
cover with the keypad overlay attached.
9. The keypad window on the new front panel may be supplied with interior and exterior pro-
tective membranes. Remove the protective membranes prior to final assembly and use of
the 6888Xi enclosure.
CAUTION
The new front panel assembly may be supplied with protective clear membranes over the interior
and exterior of the window. Failure to remove the exterior protective membrane may cause the
display to appear distorted. The membrane may be difficult or impossible to remove after extended
use at elevated temperatures.
NOTE
Prior to disassembly, observe the position of the plastic bumper with rubber insert as it is installed
over the CPU board. The two longer screws are used on the top edge of the CPU board passing
through the bumper.
WARNING
Installing and configuring an AC Relay Board for the Flame Status Interlock function will dedicate alarm
output 2 for this function. Once configured for Flame Status Interlock, the software will override any
previous alarm assignments for alarm output 2 and not allow it to be used for any other function.