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Repair
Replacing the Barrier Board
NOTICE
To avoid damaging the circuit boards when
servicing the control box, wear Part No. 112190
grounding strap on your wrist and ground
appropriately.
To avoid electrical component damage, remove all
system power before plugging any connectors.
1. Follow the steps in Before Servicing, page 34.
2. Loosen the screws (124) and remove the
enclosure cover (117).
3. Loosen the screws (125) and remove the barrier
cover (107), leaving the isolation board (111)
attached to the cover.
4. Note the position of the barrier
board input and output cables. See
Electrical Schematics, page 27. Disconnect the
cables from the barrier board (106).
5. Remove the two screws (108), and the three
screws (109), spacers (105), and lockwashers
(104). Remove the barrier board (106).
6. Install the new barrier board, using the screws,
spacers, and lockwashers.
7. Reconnect the cables to the barrier board, as
noted above.
8. Install the barrier cover (1
07) and isolation board
(111).
9. Turn on power at the main circuit breaker.
10. Turn on the control box power switch. Check that
the system is operating.
NOTE: The two green LEDs (D4, D5) on the
barrier board will light if the board has power.
11. Reinstal
l the cover (117) and tighten the screws
(124).
Figure 25 Replacing the Barrier Board
40 332709B