TM 10-4610-232-34
b. Disconnect connector plug (27) from the circuit board.
c. Remove bushing (28), preformed packing (29), lock ring (26) and sensor body (1O).
d. Refer to Figure 2-61, sheet 3 and replace main circuit board (43) as follows:
(1)
(2)
(3)
(4)
(5)
(6)
(7)
Remove four screws (30), Iockwashers (31) and washers (32). Alarm set board (33) will now be free.
Disconnect ribbon cable (34) from LED board (35).
Remove four capscrews (36). LED board (35) will now be free.
Disconnect wiring harness (44) from LED board (35).
Remove reset button (6) by removing jam nut (37) and washer (38).
Remove alarm horn (39) by removing nut (40) and lift the horn out of CO monitor,
CAUTION
When removing circuit board, be careful not to break wiring from reset button to
alarm horn. It is small and fragile.
Remove three screws (41) and one extension (42), Circuit board (43) will now be free.
REPAIR.
a. Replace damaged ring tongue connector (para. 4-10, TM 10-4610-232-12),
b. Replace missing or defective components.
c. Repair damaged cable (para. 2-7).
REASSEMBLY.
CAUTION
When installing main circuit board, take care not to break wiring to reset button or
alarm horn,
a. Install circuit board (43) and secure with three screws (41) and extension (42),
b. Install alarm horn (39) and secure with nut (40).
c. Install reset button (6) and secure with nut (37) and washer (38).
d. Connect wiring harness (44) to LED board (35),
e. Mount LED board (35) with capscrews (36).
f. Connect ribbon cable (34) to LED board (35),
g. Mount alarm set board (33) on screws (36) with screws (30), Iockwashers (31) and washers (32).
h. Install sensor body (1 O, sheet 2), lock ring (26), preformed packing (29) and bushing (28).
i. Tighten lock ring (26).
j. Connect plug (27) to circuit board,
a. Refer to Figure 2-61, sheet 2 and install the CO monitor. Secure with washers (25), Iockwashers (24) and
capscrews (23).
b. Install cable connectors (20) and secure with gasket (22) and connector nuts (21).
c. Connect power leads (18) on terminal board (19) as tagged.
d. Close CO monitor box door and turn coin slot 1/4 turn counterclockwise to lock the door.
e. Turn on electrical power to ROWPU (AC and DC),
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