Sharp R-4H56, Service Manual

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28
R-4H56
DOOR REPLACEMENT
1. CARRY OUT 3D CHECKS.
2. Remove two (2) screws holding the lower oven hinge to
the oven cavity. The lower oven hinge is now free.
3. Release the door assembly from the upper oven hinge.
4. Remove door assembly.
5. Door assembly is now free.
6. Re-install upper oven hinge to the new door assembly.
7. On re-installing new door assembly, secure the lower
oven hinges with the two (2) mounting screws to the oven
cavity. Make sure the door is parallel with bottom line of
the oven face plate and the latch heads pass through the
latch holes correctly.
8. CARRY OUT 4R CHECKS.
Note: After any service to the door, an approved microwave
survey meter should be used to assure compliance
with proper microwave radiation standards. (Refer
to Microwave Measurement Procedure.)
DOOR ADJUSTMENT
When removing and/or loosening hinges such as in door
replacement, the following adjustment criteria are taken.
Door is adjusted to meet the following three conditions by
keeping screws of hinge loose.
1. Adjust door latch heads at a position where they smoothly
catch the latch hook through the latch holes. Refer to
latch switch adjustments.
2. Deviation of the door alignment from horizontal line of
cavity face. The plate is to be less than 1.0mm.
3. The door is positioned with its face depressed toward the
cavity face plate.
4. Reinstall outer case and check for microwave leakage
around the door with an approved microwave survey
meter. (Refer to Microwave Measure ment Procedure.)
LATCH
HEADS
LOWER
OVEN
HINGE
DOOR
ASSEMBLY
UPPER
OVEN
HINGE
OUTER
CASE
CABINET
RE-INSTALL
Figure C-6 Door Assembly Replacement and Adjustment
CHOKE COVER REMOVAL
1. Insert an iron plate (thickness of about 0.5mm) or flat
type screw driver to the gap between the choke cover
and door panel as shown in the figure to free the
engaging part.
2. Lift up the choke cover, now cover is free.
FLAT TYPE
SCREW-DRIVER
PROTECT BY TAPE
FLAT TYPE
SCREW-DRIVER
CHOKE
COVER
DOOR
PANEL
DOOR PARTS REMOVAL
Remove the door assembly, referring to from item 1 through
item 5 of “DOOR REPLACEMENT”.
1. Place the door assembly on a soft cloth with latch heads
facing up.
2. Remove the choke cover, referring to “CHOKE COVER
REMOVAL”.
LATCH HEAD REMOVAL
3. Lift up the latch head towards the direction that the arrow
shows in the figure C-7, and release the latch head from
the holes in the door panel.
4. Release the latch spring with the latch head from the tabs
of the door panel.
5. Release the latch spring from the latch head.
6. Now, the latch head is free.
LATCH HEAD RE-INSTALL
1. Pick up the latch spring and catch the one ring of the latch
spring on the tab of the door panel as shown in Figure C-
7.
2. Catch the other ring of the latch spring on the tab of the
latch head.
3. Install the latch head to the holes in the door panel.
Tab of the
latch head
Ring
Latch spring
Ring
Tab of the door panel
Door
Panel
Latch
head
1
2
Figure C-7. Latch head removal and re-install
DOOR REPLACEMENT AND ADJUSTMENT