Reassembly Test; Replacement Of Fuse & H.v.trans Fuse; Replacement Of Drive Motor - Samsung SMH7178STE Service Manual

4-3-4 Reassembly Test

After replacement of the defective component parts of the door, reassemble it and follow the instruc-
tions below for proper installation and adjustment so as to prevent an excessive microwave leakage.
1. When mounting the door to the oven, be sure to adjust the door parallel to the bottom line of the oven face
plate by moving the upper hinge and lower hinge in the direction necessary for proper alignment.
2. Adjust so that the door has no play between the inner door surface and oven front surface. If the door assem-
bly is not mounted properly, microwave energy may leak from the space between the door and oven.
3. Do the microwave leakage test.
4-4 Replacement of Main Fuse & H. V. Trans Fuse
The fuse is located behind the control panel mounted
to the installation bracket.
1. Disconnect power and remove grille.
2. Remove a screw that secure the installation
bracket.
MAIN FUSE
1. When 20A fuse blows out by the operation of
interlock monitor switch failure, replace the
primary interlock switch, door sensing switch,
interlock monitor switch and power relay.
2. When the above 3 switches operate properly,
check if any other part such as the control
circuit board, blower motor or high voltage
transformer is defective.
1. When 20 Amp. fuse is blown due to operation of the H. V. Trans fall mode, the H. V. Trans Fuse must be
replaced.

4-5 Replacement of Drive Motor

1. Disconnect power.
2. Remove the three screws at the assy base bottom.
3. Remove the plastic cover (fixed with a screw) that
covers the motor.
4. Remove all of the wires connected.
5. Remove a screw from the motor.
6. Turn the motor to the right and remove it.
7. After replacing the motor, you should re-install it on
the accurate position of the coupler.
8. Assembling is in the reverse order to disassebling.
H. V. TRANS FUSE
BASE PLATE
- 11 -
MAIN FUSE
H. V. Trans
FUSE
Screw(1)
DRIVE MOTOR