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C. Lower the PCB through its slot on the rear
panel (Figure 6,Item 3).
D. Secure the PCB to the panel with 2 11/32" hex
nuts (Figure 6,Item 12).
NOTE: If connectors P1 through P4 were
unhooked,re-connect them.
E. If no further troubleshooting is required,re-
install the panel assembly (Procedure 6),junction
box cover (Procedure 4),and mounting hardware
(Procedure 2).
15. Power Transformer (T2) Removal
NOTE: Refer to Figure 4 for Procedures 15
and 16 unless otherwise specified.
A. Remove the mounting hardware (Procedure
1),junction box cover (Procedure 3),and panel
assembly (Procedure 5).
B. Remove 4 5/16" hex nuts (15) and washers
(16) that secure the power transformer (14) to the
rear panel (Figure 6,Item 3).
C. Unhook the transformer primary connector
J402 and the transformer secondary connector
J403 from the Main PCB Assembly (Figure
6,Item13).
D. Lift the transformer carefully up from the
panel.
16. Power Transformer (T2) Replacement
A.Position the transformer (14) in its original
location.
B. Secure the transformer to the rear panel
(Figure 6,Item 3) with 4 5/16" hex nuts (15) and
4 washers (16).
C. Re-connect the transformer primary connector
J402 and the transformer secondary connector
J403 to the Main PCB Assembly (Figure 6,Item
13).
D. If no further troubleshooting is required,re-
install the panel assembly (Procedure 6),junction
box cover (Procedure 4),and mounting hardware
(Procedure 2).
17. "Keep Alive" Transformer (T1) Removal
NOTE: Refer to Figure 6 for Procedures 17 and
18 unless otherwise specified.
A. Remove the mounting hardware (Procedure
1),junction box cover (Procedure 3),and panel
assembly (Procedure 5).
B. Remove 2 1/4" nuts (9) which secure the
transformer (8) to the rear panel (3).
C. The transformer primary and secondary wires
are hardwired to the Main PCB Assembly
(13).Make a note of the wire locations and
desolder all connections.
D. Lift the transformer away from the panel.
18. "Keep Alive" Transformer (T1) Replacement
A. Secure the transformer (8) to the rear panel
(3) with 2 1/4" nuts (9).
B. Re-connect the primary side and secondary
side connections to the Main PCB Assembly (13)
as follows:
• Solder the red primary wire to T404.
• Solder the black primary wire to T403.
• Solder the blue secondary wire to T405.
• Solder the white secondary wires (2) to T402
and T401 (order is irrelevant).
C. If no further troubleshooting is required,re-
install the panel assembly (Procedure 6),junction
box cover (Procedure 4), and mounting
hardware (Procedure 2).
16
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