R1900J
9 – 5
NOTE: When the relay unit is replaced, set the standard voltage refer-
ring to Special Function pages.
[15] DOOR SENSING SWITCH/ SECONDARY INTERLOCK SWITCHES (1), (2) AND MONITOR
SWITCHES (1), (2) REPLACEMENT
1. REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect all wire leads from the all switches.
3. Remove two (2) screws holding latch hook to oven flange.
4. Remove latch hook assembly from oven flange.
5. Remove the switch(es) in accordance with following procedure.
DOOR SENSING SWITCH
Push the two (2) tabs outward and pull switch forwards to release
switch.
MONITOR SWITCHES OR SECONDARY INTERLOCK SWITCHES
Remove one (1) screw and nut holding two switches together to latch
hook.
6. Now, switch(es) is now free.
2. REINSTALLATION
1. Re-install the switch(es) in accordance with following procedure.
DOOR SENSING SWITCH
Mount the door sensing switch in the lower position of latch hook.
MONITOR SWITCHES
1) Mount the two (2) switches side by side in the top position of the
latch hook.
2) Fasten both switches together to latch hook with one (1) screw and
nut.
SECONDARY INTERLOCK SWITCHES
1) Mount the two (2) switches side by side in the middle position of the
latch hook.
2) Fasten both switches together to latch hook with one (1) screw and
nut.
2. Re-install latch hook assembly and fasten it to oven flange with two
(2) screws.
3. Re-connect all wire leads to all switches, referring to pictorial dia-
gram. Be careful to ensure proper connection of the wire leads.
4. Make sure that the monitor switches (1), (2) and all other switches
are operating properly. And check continuity of the monitor circuit.
Refer to chapter “Test Procedure” and Adjustment procedure.
[16] DOOR SENSING SWITCH/ SECONDARY INTERLOCK SWITCHES (1), (2) AND MONITOR
SWITCHES (1), (2) ADJUSTMENT
1. Adjustment procedure
1. CARRY OUT 3D CHECKS.
If the door sensing switch, secondary interlock switches (1), (2) and
monitor switches (1), (2) do not operate properly due to a misadjust-
ment, 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 door sensing switch and secondary interlock switches (1), (2)
are activated with the door closed. The horizontal position of the
latch hook should be adjusted so that the monitor switches (1), (2)
are activated with the door closed.
4. Secure the screws with washers firmly.
5. Check the operation of all switches. If all switches have not acti-
vated with the door closed, loosen two (2) screws and adjust the
latch hook position.
2. After adjustment, check the following.
1. In and out play of door remains less than 0.5mm when in the
latched position.
2. The door sensing switch and secondary interlock switches (1), (2)
interrupt the circuit before the door can be opened.
3. Monitor switches (1), (2) 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.)
Figure C-4. Latch Switch Adjustments
[17] DOOR REPLACEMENT
1. REMOVAL
1. CARRY OUT 3D CHECKS.
2. Disconnect the harness of the door assembly from the control unit.
3. Remove the two (2) screws holding each of the upper and lower
hinges to the oven cavity.
4. Remove door assembly with upper and lower hinges by pulling it
forward.
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