Sharp R-212B Service Manual page 58

R-212B
1ST. LATCH SWITCH, 2ND. INTERLOCK RELAY CONTROL SWITCH AND MONITOR SWITCH REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect wire leads from all switches.
3. Remove the control panel assembly and switch lever
from the oven cavity front flange, referring to chapter
"CONTROL PANEL ASSEMBLY AND SWITCH LE-
VER REMOVAL"
4. Remove two (2) screws holding latch hook to oven
flange.
5. Remove latch hook assembly from oven flange.
6. Push outward on the two (2) retaining tabs holding
switch in place.
7. Switch is now free.
Re-install
1. Re-install each switch in its place. The 2nd. interlock
1ST. LATCH SWITCH, 2ND. INTERLOCK RELAY CONTROL SWITCH AND MONITOR SWITCH ADJUSTMENT
If the 1st. latch switch, 2nd. interlock relay control switch
and monitor switch do not operate properly due to a
misadjustment, the following adjustment should be made.
1. Loosen the two (2) screws holding the latch hook to the
flange of the oven front face.
2. With the door closed, adjust latch hook by moving it
back and forth and up and down. In and out play of the
door allowed by the upper and lower position of the
latch hook should be less than 0.5mm. The horizontal
position of the latch hook should be adjusted so that the
monitor switch is activated with the door closed. The
vertical position of the latch hook should be adjusted so
that the 1st. latch switch and the 2nd. interlock relay
control switch are activated with the door closed.
3. Secure the screws firmly.
4. Check the operation of all switches. If each switch has
not activated with the door closed, loosen screw and
adjust the latch hook position.
After adjustment, make sure of the following.
1. In and out play of the door remains less than 0.5mm
when in the latched position. First check upper position
of latch hook, pushing and pulling upper portion of door
toward the oven face. Then check lower portion of the
latch hook, pushing and pulling lower portion of door
toward the oven face. Both results (play in the door)
REMOVAL
1. Disconnect oven from power supply.
2. Push the open button and open the door slightly.
3. Insert a putty knife (thickness of about 0.5mm) into the
gap between the choke cover and corner portion of
door panel as shown in Figure C-8 to free engaging
parts.
4. Try the principles of the lever and lift up the choke cover
by inserting a putty knife in order shown in figure C-8.
5. Release choke cover from door panel.
6. Now choke cover is free.
7. Release two (2) pins of door panel from two (2) hole of
upper and lower oven hinges by lifting up.
relay control switch is in upper position. The 1st. latch
switch and monitor switch are in the lower position.
2. Re-connect wire leads to each switch. Refer to chapter
"Pictorial Diagram".
3. Secure latch hook (with two (2) mounting screws) to
oven flange.
4. Re-install the switch lever and the control panel as-
sembly to the oven cavity front flange.
5. Re-connect wire leads to the control unit. Refer to
chapter "Pictorial Diagram".
6. Make sure that monitor switch is operating properly
and check continuity of the monitor circuit. Refer to
chapter "Test Procedure", and Adjustment Procedure
below.
should be less than 0.5mm.
2. The 1st. latch switch and 2nd. interlock relay control
switch interrupt the circuit before the door can be
opened.
3. The monitor switch contacts close when the door is
opened.
4. Re-install outer case and check for microwave leak-
age around the door with an approved microwave
survey meter. (Refer to Microwave Measurement Pro-
cedure.)
DOOR
Figure C-7. Latch Switch Adjustments
DOOR REPLACEMENT
8. Now, door panel is free from oven cavity.
9. Release door panel from ten (10) tabs of door frame
and remove door frame by sliding the door panel
downward.
10.Now, door panel with sealer film is free.
11.Tear sealer film from door panel.
12.Now, door panel is free.
13.Slide latch head upward and remove it from door frame
with releasing latch spring from door frame and latch
head.
14.Now, latch head and latch spring are free.
15.Remove door screen from door frame.
16.Now, door screen is free.
22
LATCH HOOK
LATCH
2ND. INTERLOCK
HEADS
RELAY CONTROL
SWITCH
MONITOR
SWITCH
1ST. LATCH
SWITCH
SWITCH LEVER