Outer Case Removal; Power Transformer Removal; High Voltage Components Removal(High Voltage Capacitor And High Volt- Age Rectifier Assembly); Magnetron Removal - Sharp R-307KW Service Manual

R307KW

[2] OUTER CASE REMOVAL

To remove the outer case, procedure as follows.
1. Disconnect the power supply cord.
2. Open the oven door and block it open.
3. Remove the two (2) screws from the lower portion of the rear cabi-
net using a T20H Torx type or GTXH20-100 screw driver.
4. Remove the remaining three (3) screws from rear and one (1)
screw along the right side of outer case.
5. Slide the entire outer case back out about 1 inch (3 cm) to free it
from retaining clips on the cavity face plate.
6. Lift entire outer case from the unit.
CAUTION: DISCONNECT OVEN FROM POWER SUPPLY BEFORE
REMOVING OUTER CASE.
DISCHARGE THE
BEFORE TOUCHING ANY OVEN COMPONENTS OR
WIRING.

[3] POWER TRANSFORMER REMOVAL

1. REMOVAL
1. Disconnect the power supply cord and remove outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect wire leads (primary) from power transformer and the fil-
ament leads and high voltage wire from the magnetron and capaci-
tor terminals.
5. Remove four (4) screws (two (2) screws from the upper side and
two (2) screws from bottom side) holding transformer to bottom
plate.
[4] HIGH VOLTAGE COMPONENTS REMOVAL(HIGH VOLTAGE CAPACITOR AND HIGH VOLT-
AGE RECTIFIER ASSEMBLY)
To remove the components, proceed as follows.
1. Disconnect the power supply cord and remove outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect the high voltage wire of the power transformer from the
high voltage capacitor.
5. Disconnect the high voltage wire of high voltage rectifier assembly
from the magnetron.
6. Disconnect the filament lead (short one) of the power transformer
from the high voltage capacitor.

[5] MAGNETRON REMOVAL

1. REMOVAL
1. Disconnect the power supply cord and then remove outer case.
2. Open the oven door and block it open.
3. Discharge high voltage capacitor.
4. Disconnect all wire leads from magnetron.
5. Remove the one (1) screw holding the chassis support to the mag-
netron.
HIGH VOLTAGE CAPACITOR
NOTE: When replacing the outer case, the 2 special Torx screws
must be reinstalled in the same locations.
Special screw
6. Remove transformer from bottom plate.
2. REINSTALLATION
1. Rest transformer on the bottom plate with its primary terminals
toward the oven face plate.
2. Secure transformer with four (4) screws (two (2) screws from the
upper side and two (2) screws from bottom side) to bottom plate.
3. Reconnect wire leads (primary) to power transformer and filament
leads and high voltage wire of transformer to magnetron and high
voltage capacitor. Refer to "PICTORIAL DIAGRAM".
4. Reinstall outer case and check that oven is operating properly.
7. Remove the one (1) screw holding capacitor holder to bottom plate.
8. Remove one (1) screw holding high voltage rectifier assembly to
capacitor holder.
9. Disconnect rectifier terminal from capacitor. High voltage rectifier
assembly is now free.
10.Remove capacitor holder. Capacitor is now free.
CAUTION: WHEN REPLACING HIGH VOLTAGE RECTIFIER AND
HIGH VOLTAGE CAPACITOR, GROUND SIDE TERMI-
NAL OF THE HIGH VOLTAGE RECTIFIER MUST BE
SECURED FIRMLY WITH A GROUNDING SCREW.
MAGNETRON REMOVAL
6. Release the chassis support from the hole of the oven cavity front
flange.
7. Remove the two (2) screws holding air duct to magnetron and oven
cavity top plate.
8. Remove the air duct from oven.
9. Carefully remove the four (4) screws holding magnetron to
waveguide flange.
10.Remove magnetron with care so that magnetron antenna is not hit
by any metal object around antenna.
11 – 2
Screw Driver
(Type: TORX T20 H or
GTXH20-100)