Removal and Replacement of Blower Motor

11-6625-467-34

3-15. Removal and Replacement of Heat

jacks) that secure the capacitor mounting bracket to

Sinks in Blower Assembly

the front panel.

(fig. 3-27)

( 2 ) Remove the three screws from the rear

p a n e l that correspond in position to the screws

Perform the following procedures when removing

removed in (1) above.

or replacing the heat sinks in the blower assembly:

(3) Swing the capacitor mounting bracket

a. Removal.

OUT, making the capacitors and plastic retainers

(1) Remove the four machine screws (19) and

accessible.

four lockwashers (11) that secure the filter retainer

(4) Loosen (do not remove) the two screws in

(1) to the front panel (3).

the plastic retainer that hold the capacitor being

(2) Unsolder the leads from the emitter, base,

removed.

and collector of the transistor (4).

(5) Disconnect and identify the wires from the

(3) Remove the three machine screws (13),

capacitor screw terminals.

lockwashers (11), flat washers (12), and the in-

(6) Remove the capacitor.

sulated flanged spacers (8).

b. Replacement.

NOTE

(1) Place the capacitor into the plastic retainer

Three of the insulated flanged spacers (8)

and orient so that the positive terminal (red dot) is

are located between the heat sink and the

toward the bottom.

b l o w e r assembly and must be removed

(2) Tighten the two screws in the plastic re-

from inside the blower assembly.

tainer to secure the capacitor.

(4) Remove the heat sink (5) from the inside of

(3) Replace the wires on the capacitor screw

the blower assembly (10).

terminals.

b. Replacement.

(4) Swing the capacitor mounting bracket back

(1) Place three insulated flanged spacers (8) in-

to the original position.

to the holes from the inside of the blower assembly

( 5 ) Replace the six screws that secure the

(10).

capacitor mounting bracket in the front and rear

(2) Place the heat sink over the spacers and

panels.

align the holes.

(3) Place a lockwasher (11), flat washer (12),

and insulated flanged spacer (8) on a machine screw

3-14. Removal and Replacement of Blower

(13) and start the screw into the threaded hole in the

Motor

heat sink (5).

(fig. 3-27)

(4) Repeat the procedure in (3) above for the

remaining two screws.

The blower motor is mounted on the rear of the

(5) Insure that the recessed portion of the in-

blower assembly. Perform the following procedures

sulated flanged spacers (8) are seated in the blower

when removing and replacing the blower motor.

assembly holes. Tighten the three machine screws

a. Removal.

(13).

(1) Disconnect and identify the wires on the

(6) Solder the wires to the emitter, base, and

blower motor terminal strip.

collector terminals of the transistor (4).

(2) Loosen (do not remove) the three synchro

3-16. Removal and Replacement of Circuit

clamp (15) screws that secure the blower motor.

Card Connectors

(3) Turn the synchro clamps (15) so that the

flat edge faces the blower motor.

(fig. FO-4)

(4) Remove the blower motor (14) from the

Perform the following procedures when removing

rear; be careful not to damage parts or wiring.

or replacing circuit card connectors:

a. Removal.

b. Replacement.

(1) Remove the circuit cards from the card

(1) Fit the recessed end of the blower motor

cage.

(14) into the blower well assembly.

(2) Set the test set on the bench with the card

(2) Twist the synchro clamps (15) so that the

cage facing down.

flat side is away from the blower motor (14) and the

(3) Unsolder and identify the wires going to

round side is in the blower motor groove.

the receptacle connector (4) that is to be removed.

(3) Tighten the synchro clamp (15) screws.

(4) Remove the 15 machine screws (12) and the

(4) Replace the wires on the blower motor ter-

15 lockwashers (13) from the connector plate (3).

minal strip.

3-42