Thermador SMW272 User manual

Service Manual
for
Thermador® Built-In Oven
Models:
SMW272 B,SMW272S, SMW272W,SMW272P
7
0
89
45 6
123
SENSOR
REHEAT
SENSOR
COOK
POWER
LEVEL POP CORN
TIMER CLOCK
MORE
/LESS QUICK MIN FUNCTION KEY
SERVING
/WEIGHT KEEP WARM TURBO DEFROST
STOP/RESET START
CLOCK OVEN
LIGHT
TIMER1 TIMER2
COOK
TIME STOP
TIME BAKE
SELF
CLEAN
OFF
BROIL
CONVECTION CONVECTIO
ROAST
13
0
9
8
7
456
2

Page 2
SMW Oven
Table of Contents
Manual introduction
and Safety Precautions...........................1 – 2
Microwave Oven Section:Specifications ....3
Removal from Cabinet ...................................................4
Warning:Danbger of HighVoltage ..............................5
Microwave Control Panel..............................................6
Precautions toAvoid Exposure to
Excessive Miocrowave Energy.................................7
CircuitTest Procedure ............................................8 – 9
to Use Function Pad .....................................................10
Schematic Diagrams......................................................11
Description of Operating Sequence .........................12
Cautions to be Observed
WhenTroubleshooting............................................14
Disassembly and Parts Replacement Procedure....16
ComponentTest Procedure........................................18
Measurements andAdjustments................................20
Procedure for Measuring
Microwave Energy Leakage ....................................21
Troubleshooting Guide ..........................................22-25
Parts List of Digital Programmer Circuit &
Schematic Diagrams...........................................26-29
Warming Drawer Section..........................31
Replace thermostat or On/off Switch......................32
Replace Heating Element:............................................33
Replace Liner Slides:.....................................................33
Warming DrawerWiring Diagram............................34
Lower Oven Section ...................................35
SymbolsYouWill See in the Manual..........................36
Serial Number/Data Sticker Location ......................37
Removing the Bake and Broil Elements,Catalyst ..38
Removing the OvenTemperature Sensor ...............40
Removing the Convection Bake Element ................41
RemovingA Convection Fan Motor .........................42
RemovingA Halogen Lamp Holder ..........................44
Removing the Control Panel and Display Head.....46
Removing the Oven Light Switch,
The Oven Door LatchAssembly,
The Hi-Temp Cutout...............................................48
Removing the Relay Board..........................................50
Lower Oven Relay Board ............................................51
Removing theAir Switches .........................................52
Removing the Blower...................................................54
Removing the LampTransformer &
the Lower Oven Stalled Fan Relay .......................56
Removing the Lower Oven Door .............................57
Removing the Oven Door Gasket ............................58
Removing the Oven Door Components.................59
Removing the“S” Oven Module................................60
Troubleshooting.............................................................61
Connectors.....................................................................65
Convection Oven Relay Board...................................68
Oven Relay Board Matrix............................................69
Error Code Messages...................................................71
Electronic Oven ControlTest Modes.......................72
Sequence of Operation................................................75
Lower Oven....................................................................75
Bake Cycle — Bake Preheat and Bake Mode.........75
Broil Cycle — Broil Preheat and Broil Mode.........76
Convection Cycle – Convection Preheat
and Convection Mode.............................................77
Convection Roast Preheat ..........................................78
Convection Roast Cycle..............................................79
Self-Clean Cycle — Preheat below 840˚.................80
Self-Clean Cycle.............................................................81
Lower OvenWiring Diagram
and Schematic................Foldout,inside back cover

Page 1
SMW Oven Service ManualIntroduction
SAFETY PRECAUTIONS
PRECAUTIONSTO BE OBSERVED BEFOREAND DURING SERVICINGTO
AVOID POSSIBLE EXPOSURETO EXCESSIVE MICROWAVE ENERGY:
A. Do not operate or allow the oven to be operated with the door open.
B. Make the following safety checks on all ovens to be serviced before activating the magnetron or
other microwave source,and make repairs as necessary.
(1) Interlock operation.
(2) Proper door closing.
(3) Seal and sealing surfaces (arcing,wear,and other damage).
(4) Damage to or loosening of hinges and latches.
(5) Evidence of dropping or abuse.
C. Before turning on microwave power for any service test or inspection within the microwave gener-
ating compartments, check the magnetron, wave guide or transmission line, and cavity for proper
alignment,integrity,and connections.
D. Any defective or misadjusted components in the interlock,monitor,door seal and microwave gen-
eration and transmission systems shall be repaired,replaced,or adjusted by procedures described in
this manual before the oven is released to the owner.
E. A microwave leakage check to verify compliance with the Federal performance standard should be
performed on each oven prior to release to the owner.
F. Operate the oven from a properly grounded AC outlet capable of supplying 120/240 or a 120/208
volt,60Hz.
This manual contains information that is necessary for servicing the Thermador® built-in
electric ovens,models:
SMW272B,SMW272W,SMW272S,SMW272P
This manual, as well as the information contained in it, is designed to be used
only by qualified authorized Thermador service personnel, familiar with and
knowlegable of proper safety and servicing procedures and possessing high quality
testing equipment associated with Microwave, gas and electrical appliance repiar.
Thermador recommends that customers DO NOT SERVICE THEIR OWN
UNITS,due to the complexity and the risk of high-voltage electrical shock.
All individuals who attempt repairs by improper means or adjustment subject
themselves and others to the risk of serious and fatal injury.
Use only genuineThermador approved fdactory replacement components.
The information is organized to help the servicer easily find what is needed to repair the unit.
SMW SERVICE MANUAL

Page 2
SMW Oven Service ManualIntroduction
INTRODUCTION
Model SMW272
Model SMW272 is desigmed with modular construction which makes it easier to service. The SMW Oven
hasamicrowavesectionthatisenclosedinthestructure.Themicrowavesectioncanbepulledouttoservice
additionally, it has a warming drawer built into the structure below the microwave section. It does not need
to be removed for service. All service can be performed from the front. The lower oven is an “S” oven with
single “S” oven controls.
1 Time of Day Clock and Lower Oven
Display Window
2 Touch Pads for Lower Oven
3 Microwave Oven Section
4 Warming Drawer Section
5 Oven Cooling Vents
6 Lower Convection Oven Section
7 Lower Oven Exhaust Vent
1 2
3
4
5
6
7
1
2
3
4
5
6
7
7
0
89
45 6
123
SENSOR
REHEAT
SENSOR
COOK
POWER
LEVEL POP CORN
TIMER CLOCK
MORE
/LESS QUICK MIN FUNCTION KEY
SERVING
/WEIGHT KEEP WARM TURBO DEFROST
STOP/RESET START
CLOCK OVEN
LIGHT
TIMER1 TIMER2
COOK
TIME STOP
TIME BAKE
SELF
CLEAN
OFF
BROIL
CONVECTION CONVECTION
ROAST
13
0
9
8
7
456
2

Page 3
SMW Oven Service ManualMicrowave Oven Section
7
0
89
45 6
123
SENSOR
REHEAT
SENSOR
COOK
POWER
LEVEL POP CORN
TIMER CLOCK
MORE
/LESS QUICK MIN FUNCTION KEY
SERVING
/WEIGHT KEEP WARM TURBO DEFROST
STOP/RESET START
CLOCK OVEN
LIGHT
TIMER1 TIMER 2
COOK
TIME STOP
TIME BAKE
SELF
CLEAN
OFF
BROIL
CONVECTION CONVECTION
ROAST
13
0
9
8
7
456
2
Microwave Oven Section
Specifications
Models:
Power Source: 120VAC Single Phase,60 Hz
Power Requirements: 1420W (12.1A)
Output: 1100W
Microwave Frequency: 2,450MHz
Timer: 30 min./stage (HIGH Power) – 5 Stage Maximum
99 min.99 sec./stage (Other Power Levels) 3 Stage Maximum
Oven Cavity Size: 2.1 cu. ft.
Inside Dimensions: 18-7/16" (W) X 181/2" (D) X 1011/16" (H)
(W x D x H) 469mm (W) X 470mm (D) X 271 mm (H)
Weight: 40 Ibs/18.1 kg
Inverter Power Supply Output power:IEC705-88Test procedure
Specifications subject to change without notice

Page 4
SMW Oven Service ManualMicrowave Oven Section
To remove microwave section from cabinet:
1) Using both hands, pull the sides of the frame forward and unsnap the posts on both sides
of the frame from the catches on the enclosure (See Illustrations, below).
2) Remove the two screws holding the microwave section in the enclosure.
3) Pull the microwave section out of the cabinet half way.
4) Disconnectthe electrical cord(Top left,back corner)andremove themicrowave section
all the way out of the enclosure.
Post (Step 1)
Catch
(Step 1)
➞
Screws
(Step 2)
Electrical
Cord
(Step 4)
Screws
(Step 2)
Visible after Frame removal
Frame
removal
Pull with both hands;
unsnap posts at each corner
(Step 1).
➞
➞

Page 5
SMW Oven Service ManualMicrowave Oven Section
!
!
Thermador Customer Service
5551 McFaddenAve.
Huntington Beach,CA 92646
800/735-4328

Page 6
SMW Oven Service ManualMicrowave Oven Section
Microwave Control Panel
7
0
89
45 6
123
SENSOR
REHEAT
SENSOR
COOK
POWER
LEVEL POP CORN
TIMER CLOCK
MORE
/LESS QUICK MIN FUNCTION KEY
SERVING
/WEIGHT KEEP WARM TURBO DEFROST
STOP/RESET START
DisplayWindow
Sensor Cook Pad
Automaticallycalculatescooking timefor
six different items.
Popcorn Pad
Automatically timed by weight.
Number Pads
Time of Day Clock Pad
Quick Minute Pad
Adds or sets time in 1 minute
increments,up to 10 minutes.
Turbo Defrost
Defrosts by weight.
KeepWarm Pad
Three different foods can be kept
warm for 30 minutes after cooking.
Start Pad
One tap allows oven to begin functioning.
If door is opened or Stop/Reset Pad is
pressed once during oven operation.Start
Pad must be pressed again to restart oven.
Sensor Reheat Pad
Automatically reheats.
Three different categories.
Power Level Pad
Manually changes Microwave power.
Timer Pad
Counts down and signals end
time. Can be used for delay or
stand time.
More/Less Pad
Increases or decreases
cooking time for Sensor
Cook or Sensor Reheat.
Stop/Reset Pad
Before cooking: One tap clears your
instruction. During cooking: one tap
temporarily stops to cooking process.
Another tap cancels all your instructions
and time of day or colon appears on the
DisplayWindow.
Beep Sound
Whena padis pressedcorrectly,a beep
will be heard.If a pad is pressed and no
beepis heard,theunitdid notorcannot
accept the instruction.The oven will
beep twice between programmed
stages. At the end of any complete
program,the oven will beep 5 times.
Function Key Pad
Selects the noncooking features,
i.e.Child Lock,etc.

Page 7
SMW Oven Service ManualMicrowave Oven Section

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SMW Oven Service ManualMicrowave Oven Section

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SMW Oven Service ManualMicrowave Oven Section

Page 10
SMW Oven Service ManualMicrowave Oven Section
To Use Function Pad

Page 11
SMW Oven Service ManualMicrowave Oven Section
SCHMATIC DIAGRAM
LMF M
PRIMARY
LATCH
SWITCH
TURN
TABLE
MOTOR
OVEN
LAMP FAN
MOTOR
SHORT
SWITCH
FUSE
18A
51
31
341
DIGITAL PROGRAMMER CIRCUIT
VARISTOR POWER
RELAY A
(RY2)
POWER
RELAY B
(RY1)
LOW VOLTAGE
TRANSFORMER
SECONDARY
LATCH
SWITCH
BLACK WHITE
AC120V
60Hz
GREEN
NOTE: Door is closed.
Unit is not operating.
Ground
Chassis
P0
P120
MAGNETRON
CAUTION:
HIGHVOLTAGE AREA
TEMP SENSOR
(THERMAL PROTECTOR)
31
STEAM SENSOR
CN703 E702
E701
CN702
INVERTER
CN701 INV P.C.B.
CN1
}
CUTOUT
THERMAL
CN701

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SMW Oven Service ManualMicrowave Oven Section

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SMW Oven Service ManualMicrowave Oven Section

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SMW Oven Service ManualMicrowave Oven Section

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SMW Oven Service ManualMicrowave Oven Section

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SMW Oven Service ManualMicrowave Oven Section
DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE

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SMW Oven Service ManualMicrowave Oven Section

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SMW Oven Service ManualMicrowave Oven Section