1St. Latch Switch, 2Nd. Interlock Relay Control Switch And Monitor Switch Adjustment; 1St. Latch Switch, 2Nd. Interlock - Sharp R-222T Service Manual

[12] 1ST. LATCH SWITCH, 2ND. INTERLOCK RELAY CONTROL SWITCH AND MONITOR
SWITCH ADJUSTMENT
1. REMOVAL
1. CARRY OUT 3D CHECKS.
2. Remove the control panel assembly, referring to section of CON-
TROL PANEL ASSEMBLY REMOVAL.
3. Disconnect wire leads from the switches.
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.
[13] 1ST. LATCH SWITCH, 2ND. INTERLOCK RELAY CONTROL SWITCH AND MONITOR
SWITCH ADJUSTMENT
1. Adjustment
1. CARRY OUT 3D CHECKS.
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.
2. Loosen the two (2) screws holding latch hook to the oven cavity
front flange.
3. With 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 vertical position of the latch hook should be adjusted so that
the 1st. latch switch and 2nd. interlock relay control switch are acti-
vated with the door closed. The horizontal position of the latch hook
should be adjusted so that the plunger of the monitor switch is
pressed with the door closed.
4. Secure the screws with washers firmly.
5. Check the operation of all switches. If each switch has not activated
with the door closed, loosen screw and adjust the latch hook posi-
tion.
2. After adjustment, check the following.
1. In and out play of 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 the door toward the oven face. Both results (play in
the door) should be less than 0.5mm.
Control panel frame
Large
depression
Small
backing
paper
Ribbon
cable
Graphic Membrane
sheet switch
Figure C-4. Graphic Sheet and Membrane Switch Replacement
Liquid crystal
display
Slit
Ribbon cable
of membrane
switch
Small
depression
2. REINSTALL
1. Re-install each switch in its place. The 1st. latch switch and the
monitor switch are in the lower position and the 2nd. interlock relay
control switch is in the upper position.
2. Secure latch hook (with two (2) mounting screws) to oven flange.
3. Re-connect wire leads to each switch. Refer to pictorial diagram.
4. Reinstall the control panel assembly to the oven cavity.
5. Reconnect wire leads to the control unit, referring to the pictorial
diagram.
6. Make sure that the monitor switch is operating properly and check
continuity of the monitor circuit. Refer to chapter "Test Procedure"
and Adjustment procedure.
2. The 1st. latch switch and 2nd. interlock relay control switch inter-
rupt the circuit before the door can be opened.
3. Monitor switch contacts close when door is opened.
4. Re-install outer case and check for microwave leakage around
door with an approved microwave survey meter. (Refer to Micro-
wave Measurement Procedure.)
Door
Latch
Heads
Switch Lever
Figure C-5. Latch Switch Adjustments
10 – 5
Control panel frame
(Rear side)
Long slit
Contact surface
Rubber connector
Latch Hook
R-222T(W)
2nd. Interlock
Relay Control
Switch
Monitor Switch
1 st. Latch
Switch