Thermador SMW 272 B, Service Manual, Page: 65 / 84

Page 63
SMW O ven Service Manual Lower O ven Section
T H E OVEN DOOR LAT CH
ASSEMBLY
The oven door latch locks the oven door during the
CLEAN
cycle (see the illustration at the bottom of
the next column for the various latch positions).
Refer to Page 57 to access the oven door latch
assembly.
To test one of the latch switches:
1. W ith no power applied, remove the wire
connectors from the switch terminals.
2. Set the ohmmeter to the R x 1 scale.
3. Connect one of the ohmmeter leads to the
common (C) terminal of the switch.
4. Touch the other ohmmeter lead to the N .O .
(normally-open) switch terminal. The meter
should indicate no continuity with the switch
in its normal position, and continuity when it
is activated.
5. If the reading is not correct, remove and
replace the switch.
To test the door latch motor windings:
1. W ith no power applied, disconnect the motor
wires from the terminal block and main har-
ness connector.
2. Set the ohmmeter to the R x 100 scale.
3. Touch the ohmmeter leads to the motor wire
connectors. The meter should read between
700
Ω
and 750
Ω
.
4. If the reading is not within this range, remove
and replace the door latch assembly.
OVEN DOOR LATCH
Motor Terminals
Com
Com
N.O.
N.O.
Lock
Switch
Unlock
Switch
Lat ch Posit ion Lock Swit ch Unlock Swit ch
Unlatched Closed O pen
Latched O pen Closed
UNLATCHED POSITION
LATCHED POSITION
Lock Switch Open UnLock Switch Closed
Lock Switch Closed
UnLock Switch Open
Door Latch Positions
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