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6
888Xi Advanced Electronics Instruction Manual Section 5: Maintenance and Service
PN 51-6888Xi December 2012
Maintenance and Service 87
board is correctly aligned within the slots in the enclosure. See Figure 5-8 for the correct
location of the AC Relay Board.
8. Connect two wires approxmately 6" long each between the "HTR COM" and the "HTR NC"
connections on the I/O Board and the "RELAY IN"connections on the AC Relay Board; observe
polarity. See Figure 5-7 for wiring details.
9. Connect the flame status indicator contact to the "DI+" and "DI-" on the AC Relay Board. See
Figure 5-7 for wiring details.
10. Connect the AC input and output wiring to the Transmitter. See Figure 5-7 for wiring details.
11. Slide the AC Relay Board completely into the 6888Xi enclosure.
12. Swing the cover up in place and tighten the four screws.
5.5.3 Power Supply Board Replacement
Use the procedure that follows to replace the Power Supply board in the 6888Xi. Use this proce-
dure to replace an original Linear Power Supply board or the current configuration Switching
Power Supply 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. Refer to the wiring diagram in Figure 5-9. Unplug the AC input wiring plug from the Power
Supply board. A new plug is supplied in the replacement kit and should be used if the
6888Xi plug is damaged.
4. Disconnect the 14-pin ribbon cable from the Power Supply board.
5. Remove the two long screws that secure the bracket (9, Figure 5-1) to the 6888Xi enclosure.
6. Hold the AC input wiring to the right and slide the Power Supply board out of the 6888Xi
enclosure.
7. Install the new mounting bracket (9, Figure 5-1) on the new Power Supply board (10, Figure
5-1). A new bracket and mounting screws are provided in the replacement kit.
WARNING
Disconnect and lock out power before working on any electrical components.
FIGURE 5-8. I/O and AC Relay Board Position in 6888Xi Enclosure