Thermador SMW 272 B Service Manual page 65

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Lower O ven Section
T H E OVEN DOOR LAT CH
ASSEMBLY
The oven door latch locks the oven door during the
cycle (see the illustration at the bottom of
CLEAN
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.
Motor Terminals
Lat ch Posit ion
Unlatched
Latched
N.O.
Com
Unlock
Switch
Lock
Switch
OVEN DOOR LATCH
Lock Swit ch Unlock Swit ch
Closed O pen
O pen Closed
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
Ω
700 and 750
4. If the reading is not within this range, remove
and replace the door latch assembly.
Door Latch Positions
Lock Switch Open
N.O.
Com
Lock Switch Closed
Page 63
SMW O ven Service Manual
Ω
.
UnLock Switch Closed
LATCHED POSITION
UnLock Switch Open
UNLATCHED POSITION