Control Panel Assembly Removal; 1St. Latch Switch, 2Nd. Interlock Relay Control Switch And Monitor Switch Adjustment; 1St. Latch Switch, 2Nd. Interlock - Sharp R-239 Service Manual

Power Supply
Cord
Screw
Brown Wire
Green/Yellow
Wire
Blue
Wire
Figure C-3(a) Power Supply Cord Replacement

[10] CONTROL PANEL ASSEMBLY REMOVAL

1. CARRY OUT 3D CHECKS.
2. Disconnect the leads from the control unit.
3. Remove the one (1) screw holding the control panel to the front
panel of the oven cavity.
[11] 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.
[12] 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.
Oven Cavity
Back Plate
Noise Filter
11 – 4
P ower S upply
C ord
S quare
Hole
Figure C-3(a) Figure C-3(b) Power Supply Cord Replacement
4. Lift up the control panel assembly and release it from the oven cav-
ity.
5. Now, the control panel assembly is free.
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.
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.
2. When the door is open, the contacts of the 1st. latch switch and
2nd. interlock relay control switch open within 1.6mm gap between
right side of cavity face and the door.
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.)
Latch Heads
Door
Figure C-5. Latch Switch Adjustments
R239(W)
Moulding
C ord S topper
Oven C avity
B ack P late
Latch Hook
SW3:
2nd. Interlock Relay
Control Switch
SW2:
Monitor Switch
SW1:
1st. Latch Switch