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Thermador SMW272 B Service Manual
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Thermador SMW272 B Service Manual

Thermador SMW272 B Service Manual

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Service Manual
Thermador
SMW272 B, SMW272S, SMW272W, SMW272P
COOK
STOP
1
2
3
BAKE
OFF
TIME
TIME
4
5
6
SELF
TIMER 1
TIMER 2
BROIL
CLEAN
OVEN
CLOCK
9
CONVECTIO
LIGHT
7
8
CONVECTION
ROAST
0
SENSOR
REHEAT
POWER
LEVEL
1
2
4
5
7
8
TIMER
0
MORE
QUICK
/LESS
MIN
SERVING
KEEP
/WEIGHT
WARM
STOP/RESET
for
®
Built-In Oven
Models:
SENSOR
COOK
POP
CORN
3
6
9
CLOCK
FUNCTION
KEY
TURBO
DEFROST
START

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Summary of Contents for Thermador SMW272 B

  • Page 1 TIMER 2 BROIL CLEAN OVEN CLOCK CONVECTIO LIGHT CONVECTION ROAST SENSOR SENSOR REHEAT COOK POWER LEVEL CORN TIMER CLOCK MORE QUICK FUNCTION /LESS SERVING KEEP TURBO /WEIGHT WARM DEFROST STOP/RESET START ® Thermador Built-In Oven Models: SMW272 B, SMW272S, SMW272W, SMW272P...

  • Page 2: Table Of Contents

    Oven Table of Contents Manual introduction Removing the Oven Temperature Sensor ....40 and Safety Precautions ......1 – 2 Removing the Convection Bake Element ....41 Removing A Convection Fan Motor ......42 Microwave Oven Section: Specifications ..3 Removing A Halogen Lamp Holder ......

  • Page 3: Manual Introduction And Safety Precautions

    Introduction SMW Oven Service Manual SMW SERVICE MANUAL 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...
  • Page 4 Introduction SMW Oven Service Manual INTRODUCTION Model SMW272 Model SMW272 is desigmed with modular construction which makes it easier to service. The SMW Oven has a microwave section that is enclosed in the structure. The microwave section can be pulled out to service additionally, it has a warming drawer built into the structure below the microwave section.

  • Page 5: Microwave Oven Section: Specifications

    Microwave Oven Section SMW Oven Service Manual Microwave Oven Section COOK STOP BAKE TIME TIME SELF TIMER 1 TIMER 2 BROIL CLEAN OVEN CONVECTION CLOCK CONVECTION LIGHT ROAST SENSOR SENSOR COOK REHEAT POWER LEVEL CORN TIMER CLOCK MORE QUICK FUNCTION /LESS SERVING KEEP...

  • Page 6: Removal From Cabinet

    Microwave Oven Section SMW Oven Service Manual 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.

  • Page 7: Warning: Danbger Of High Voltage

    Microwave Oven Section SMW Oven Service Manual Thermador Customer Service 5551 McFadden Ave. Huntington Beach, CA 92646 800/735-4328 Page 5...

  • Page 8: Microwave Control Panel

    Microwave Oven Section SMW Oven Service Manual Microwave Control Panel Beep Sound When a pad is pressed correctly, a beep will be heard. If a pad is pressed and no beep is heard, the unit did not or cannot Display Window accept the instruction.

  • Page 9: Precautions To Avoid Exposure To Excessive Miocrowave Energy

    Microwave Oven Section SMW Oven Service Manual Page 7...

  • Page 10: Circuit Test Procedure

    Microwave Oven Section SMW Oven Service Manual Page 8...
  • Page 11 Microwave Oven Section SMW Oven Service Manual Page 9...

  • Page 12: To Use Function Pad

    Microwave Oven Section SMW Oven Service Manual To Use Function Pad Page 10...

  • Page 13: Schematic Diagrams

    Microwave Oven Section SMW Oven Service Manual SCHMATIC DIAGRAM CAUTION: NOTE: Door is closed. Unit is not operating. HIGH VOLTAGE AREA Ground Chassis MAGNETRON CN701 THERMAL PRIMARY CUTOUT LATCH SWITCH CN703 CN702 E702 AC120V TURN OVEN 60Hz TABLE LAMP MOTOR E701 MOTOR SHORT...

  • Page 14: Description Of Operating Sequence

    Microwave Oven Section SMW Oven Service Manual Page 12...
  • Page 15 Microwave Oven Section SMW Oven Service Manual Page 13...

  • Page 16: Cautions To Be Observed When Troubleshooting

    Microwave Oven Section SMW Oven Service Manual Page 14...
  • Page 17 Microwave Oven Section SMW Oven Service Manual Page 15...

  • Page 18: Disassembly And Parts Replacement Procedure

    Microwave Oven Section SMW Oven Service Manual DISASSEMBLY AND PARTS REPLACEMENT PROCEDURE Page 16...
  • Page 19 Microwave Oven Section SMW Oven Service Manual Page 17...

  • Page 20: Component Test Procedure

    Microwave Oven Section SMW Oven Service Manual Page 18...
  • Page 21 Microwave Oven Section SMW Oven Service Manual Page 19...

  • Page 22: Measurements And Adjustments

    Microwave Oven Section SMW Oven Service Manual Page 20...

  • Page 23: Procedure For Measuring Microwave Energy Leakage

    Microwave Oven Section SMW Oven Service Manual Page 21...

  • Page 24: Troubleshooting Guide

    Microwave Oven Section SMW Oven Service Manual Page 22...
  • Page 25 Microwave Oven Section SMW Oven Service Manual (Page 19). Page 23...
  • Page 26 Microwave Oven Section SMW Oven Service Manual Page 24...
  • Page 27 Microwave Oven Section SMW Oven Service Manual Page 25...

  • Page 28: Parts List Of Digital Programmer Circuit & Schematic Diagrams

    Microwave Oven Section SMW Oven Service Manual Page 26...
  • Page 29 Microwave Oven Section SMW Oven Service Manual Page 27...
  • Page 30 Microwave Oven Section SMW Oven Service Manual Page 28...
  • Page 31 Microwave Oven Section SMW Oven Service Manual Page 29...
  • Page 32 Microwave Oven Section SMW Oven Service Manual Notes Page 30...

  • Page 33: Warming Drawer Section

    Warming Drawer Section SMW Oven Service Manual Warming Drawer Section Page 31...

  • Page 34: Replace Thermostat Or On/Off Switch

    Warming Drawer Section SMW Oven Service Manual To Replace Thermostat or On/Off Switch A Remove drawer assembly ( See Figure 1.) Figure 1. REMOVING THE DRAWER To remove the drawer: To replace the drawer: • Be sure Cabinet Rails are pushed inside cabinet. WARNING: Do not remove drawer while hot.

  • Page 35: Replace Heating Element

    Warming Drawer Section SMW Oven Service Manual Figure 3. Control Assembly Figure 4. Heating Element Screw (2) Heating Element 2. To replace heating element: a. Remove screws from element brackets in back of the liner. b Disconnect the wires from the bake element. c.

  • Page 36: Warming Drawer Wiring Diagram

    Warming Drawer Section SMW Oven Service Manual Warming Drawer Wiring Diagram Figure 5. Page 34...

  • Page 37: Lower Oven Section

    Lower Oven Section SMW Oven Service Manual Lower Oven Section COOK STOP BAKE TIME TIME SELF TIMER 1 TIMER 2 BROIL CLEAN OVEN CLOCK CONVECTION CONVECTION LIGHT ROAST SENSOR SENSOR COOK REHEAT POWER LEVEL CORN TIMER CLOCK MORE QUICK FUNCTION /LESS SERVING KEEP...

  • Page 38: Symbols You Will See In The Manual

    TECH TIP!! This symbol alerts you to a service tip or a special procedure. THERMADOR ASSUMES NO RESPONSIBILITY FOR ANY REPAIRS MADE ON OUR PRODUCTS BY ANYONE OTHER THAN AUTHORIZED THERMADOR SERVICE TECHNICIANS. Page 36...

  • Page 39: Serial Number/Data Sticker Location

    Lower Oven Section SMW Oven Service Manual SERIAL NUMBER/DATA STICKER LOCATION Figure 6. COOK STOP BAKE TIME TIME SELF TIMER 1 TIMER 2 BROIL CLEAN OVEN CONVECTION CLOCK CONVECTION LIGHT ROAST Oven Control Panel, located above Microwave Section Display Window Control Panel Data Plate showing model and serial number...

  • Page 40: Removing The Bake And Broil Elements, Catalyst

    Lower Oven Section SMW Oven Service Manual REMOVING THE BAKE & BROIL ELEMENTS, CATALYST WARNING Turn off the electrical power circuit to the oven at the main junction box before ser- vicing this unit. CAUTION When you work on the oven, be careful when handling the sheet metal parts.
  • Page 41 Lower Oven Section SMW Oven Service Manual Bracket Screws Catalyst Broil Element Brackets BACK OF LINER Figure 8 Bake Broil Element Element 2 Top Front Mounting Screws Figure 7 BACK OF LINER Connectors Bake Element Bracket Bracket Screws Figure 6 Page 39...

  • Page 42: Removing The Oven Temperature Sensor

    Lower Oven Section SMW Oven Service Manual REMOVING THE OVEN TEMPERATURE SENSOR WARNING Remove the racks from the oven. Turn off the electrical power circuit to the Remove the screws from the bracket and pull oven at the main junction box before ser- the oven temperature sensor forward until vicing this unit.

  • Page 43: Removing The Convection Bake Element

    Lower Oven Section SMW Oven Service Manual REMOVING THE CONVECTION BAKE ELEMENT WARNING Remove the racks from the oven. Turn off the electrical power circuit to the Remove the front screws from the left and oven at the main junction box before ser- right oven rack supports and remove the sup- vicing this unit.

  • Page 44: Removing A Convection Fan Motor

    Lower Oven Section SMW Oven Service Manual REMOVING A CONVECTION FAN MOTOR WARNING Remove the hex nut from the front of the convection blade. NOTE: The nut has left-ro- Turn off the electrical power circuit to the tating threads. oven at the main junction box before ser- vicing this unit.
  • Page 45 Lower Oven Section SMW Oven Service Manual Oven Liner White Wire (#44) Brown Wire (#45) Fan Motor Bracket with Insulation Fan Motor Screws Convection Blade E-Ring Flat Washer Hex Nut (Left-Rotating Thread) Top Screw Top Screw Convection Baffle Bottom Screws Figure 11 Page 43...

  • Page 46: Removing A Halogen Lamp Holder

    Lower Oven Section SMW Oven Service Manual REMOVING A HALOGEN LAMP HOLDER WARNING Pry the lamp holder out of the oven liner and cut the wires approximately 2" from the lamp Turn off the electrical power circuit to the holder body. CAUTION: Be careful not oven at the main junction box before ser- to chip or scratch the oven liner when vicing this unit.
  • Page 47 Lower Oven Section SMW Oven Service Manual Halogen Lamp Lamp Holder Lamp Cover Figure 12 Page 45...

  • Page 48: Removing The Control Panel And Display Head

    Lower Oven Section SMW Oven Service Manual REMOVING THE CONTROL PANEL & DISPLAY HEAD b) Using both hands, pull the top of the con- WARNING trol panel forward and unsnap the posts on both sides of the panel from the catches Turn off the electrical power circuit to the in the subpanel (see inset 1).
  • Page 49 Lower Oven Section SMW Oven Service Manual Inset 4 DISPLAY HEAD 888 888 88 88 Inset 1 CONV BAKE ROAST CONV BAKE ROAST DELAY START COOK TIMED CLEAN BROIL1 STEAM CLEAN BROIL2 STEAM STOP TIMER U L OVEN LOCK PREHEAT LOCK PREHEAT Screws...

  • Page 50: Removing The Oven Light Switch, The Oven Door Latch Assembly, The Hi-Temp Cutout

    Lower Oven Section SMW Oven Service Manual REMOVING THE OVEN LIGHT SWITCH, THE OVEN DOOR LATCH ASSEMBLY, & THE HI-TEMP CUTOUT WARNING To remove the oven door latch assem- bly (see inset 2): Turn off the electrical power circuit to the a) Use a 1/4"...
  • Page 51 Lower Oven Section SMW Oven Service Manual Inset 1 Switch Wires TECH TIP!! Air Vent Grille You will need the following tools to remove the components: 1/4" ratchet Oven Light 1/4" thin-wall socket Switch Locking Arms #2 Phillips Offset Screwdriver OVEN DOOR LATCH SCREWS AIR VENT GRILLE AIR VENT GRILLE...

  • Page 52: Removing The Relay Board

    Lower Oven Section SMW Oven Service Manual REMOVING A RELAY BOARD WARNING Refer to Figure 16 below, and Figure 17 on the next page, for the following steps. Turn off the electrical power circuit to the Turn off the electrical power to the oven. oven at the main junction box before ser- vicing this unit.

  • Page 53: Lower Oven Relay Board

    Lower Oven Section SMW Oven Service Manual Lower Oven Relay Board OVLT BROIL BROIL2 Pnk (25) Yel (17) Blu (43) 2 Red Red (15) Red (42) Wht (20) Wht (19) (21 - 22) Blk (18) BAKE Blu (41) Blk (104) Yel (13) - Org (14) Org (16) Connector...

  • Page 54: Removing The Air Switches

    Lower Oven Section SMW Oven Service Manual REMOVING THE AIR SWITCH Refer to Figure 19 on the next page for the follow- WARNING ing steps. Turn off the electrical power circuit to the Turn off the electrical power to the oven. oven at the main junction box before ser- Open the lower oven door.

  • Page 55: Side View

    Lower Oven Section SMW Oven Service Manual Mounting Screws Bracket AIR SWITCH Mounting Inset 3 Screws Bottom Trim Inset 2 Screw Bottom Trim Flange Inset 1 Side View Lower Oven Air Switch Figure 19 Air Switch Mounting Bracket Screws Page 53...

  • Page 56: Removing The Blower

    Lower Oven Section SMW Oven Service Manual REMOVING A BLOWER To remove the lower blower (see Fig- WARNING ure 20): a) Remove the oven from the wall. Turn off the electrical power circuit to the b) Remove the rear panel from the oven. oven at the main junction box before ser- vicing this unit.
  • Page 57 Lower Oven Section SMW Oven Service Manual Blower Wire (24) To Blower Wire (23) To Upper Blower Motor Upper Blower Motor Blower Bracket Lower Blower Figure 20 Page 55...

  • Page 58: Removing The Lamp Transformer & The Lower Oven Stalled Fan Relay

    Lower Oven Section SMW Oven Service Manual REMOVING THE LAMP TRANSFORMER & THE LOWER OVEN STALLED FAN RELAY WARNING To remove an oven stalled fan relay (see Figure 22): Turn off the electrical power circuit to the a) Remove the screws and disconnect the oven at the main junction box before ser- wires from the relay terminals.

  • Page 59: Removing The Lower Oven Door

    Lower Oven Section SMW Oven Service Manual REMOVING AN OVEN DOOR Refer to Figure 30 for the following steps. To remove the door: Open the door to its fully open position. a) Grasp the door by the sides toward the back and raise the front of the door sev- Raise the hinge latch over the hook on each eral inches (there will be some resistance...

  • Page 60: Removing The Oven Door Gasket

    Lower Oven Section SMW Oven Service Manual REMOVING THE OVEN DOOR GASKET CAUTION Working from one end of the gasket to the other, carefully pull the clips that are attached When you work on the oven, be careful to the gasket out of the holes in the oven when handling the sheet metal parts.

  • Page 61: Removing The Oven Door Components

    Lower Oven Section SMW Oven Service Manual REMOVING THE OVEN DOOR COMPONENTS CAUTION To remove any of the oven door components, remove the oven door from the oven (see When you work on the oven, be careful Page 57). when handling the sheet metal parts. Refer to Figure 25 as you remove the door There are sharp edges present and you components.

  • Page 62: Removing The "S" Oven Module

    Lower Oven Section SMW Oven Service Manual REMOVING THE LOWER OVEN MODULE (27") Convection Kit—#35-00-661 WARNING Turn off the electrical power to the oven. To make servicing easier, remove the oven Turn off the electrical power circuit to the door (see Page 57). oven at the main junction box before ser- Remove the oven from the wall.

  • Page 63: Troubleshooting

    Lower Oven Section SMW Oven Service Manual TROUBLESHOOTING TESTING THE COMPONENTS WARNING TO AVOID ELECTRICAL SHOCK • DISCONNECT THE POWER TO THE APPLIANCE BEFORE SERVICING. • FOR THOSE CHECKS REQUIRING THE USE OF ELECTRICAL POWER, EXERCISE EXTREME CARE. • DO NOT PERFORM HIGH-VOLTAGE TESTS. THE BLOWER MOTOR THE AIR SWITCH Refer to Page 54 to access the blower motor.

  • Page 64: The Convection Fan Motor

    Lower Oven Section SMW Oven Service Manual THE CONVECTION FAN MOTOR THE LAMP TRANSFORMER Refer to Page 42 to access the convection fan Refer to Pages 56 to access the lamp transformer. motor. With no power applied, remove the wires With no power applied, disconnect the motor from the terminals of the lamp transformer.
  • Page 65 Lower Oven Section SMW Oven Service Manual THE OVEN DOOR LATCH ASSEMBLY If the reading is not correct, remove and The oven door latch locks the oven door during the replace the switch. CLEAN cycle (see the illustration at the bottom of the next column for the various latch positions).
  • Page 66 Lower Oven Section SMW Oven Service Manual THE BAKE ELEMENT THE BROIL ELEMENT Refer to Page 38 to access the bake element. Refer to Page 38 to access the broil element. With no power applied, remove the wires With no power applied, remove the wires from the terminals of the bake element.

  • Page 67: Connectors

    Lower Oven Section SMW Oven Service Manual CONNECTORS Wire Harness No Pin A ribbon connector is used to connect the touch @ #4 control board to the display head. The ribbon has eighteen carbon traces (conductors) that transfer 18 17 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 the signals from control board connector P1 to To Touch Control Board Connector P1...
  • Page 68 Lower Oven Section SMW Oven Service Manual CONNECTOR J5 CONNECTOR P2 Connector P2 On Touch Control Board Upper Oven Not Used Door Latch Switch To Connector J1-2 On Relay Board To Connector J1-2 On Display Head To Connector J1-1 On Display Head Door Switch N.O.
  • Page 69 Lower Oven Section SMW Oven Service Manual CONNECTOR J8 CONNECTORS J9 & J10 Not Used Not Used Lower Oven Door Latch Switch Lower Oven Sensor 1050 Ω Door Switch N.O. Not Used Lock Switch N.O. Unlock Switch N.O. Upper Oven Sensor NOTE: The #4 pin is missing to avoid miswiring 1050 Ω...

  • Page 70: Convection Oven Relay Board

    Lower Oven Section SMW Oven Service Manual Convection Oven Relay Board LowerOven — #16-10-660 Connector J10 Upper Oven Sensor Connector J9 Connector J7 Connector J2 Lower Oven Sensor Lower Oven Relay Board Display Head Connector J8 Lower Oven Door Latch K9 K6 Connector J5 Upper Oven...

  • Page 71: Oven Relay Board Matrix

    Lower Oven Section SMW Oven Service Manual Oven Relay Board Matrix Relay Item Bake Broil Convect. Element Convect. Motor None Fans Both Oven Lights Oven Door Latch Page 69...
  • Page 72 Lower Oven Section SMW Oven Service Manual ERROR CODE MESSAGES Error Example Cause Corrective Action Code Replace main relay Element supervisor is enabled. Bad main relay board. board. Over temperature detected. Intermittent temperature Replace temperature sensor or bad main relay sensor.

  • Page 73: Error Code Messages

    Lower Oven Section SMW Oven Service Manual Error Corrective Cause Example Code Action Check all power con- Communication error detected by Lower oven relay board nections to the oven display head. not powered up. relay boards and the display head. Check all communication connec- tions to the oven relay boards and the display...

  • Page 74: Electronic Oven Control Test Modes

    Lower Oven Section SMW Oven Service Manual ELECTRONIC OVEN CONTROL TEST MODES HANDLING THE BOARDS Touch Control Board The Touch Control Board and the Display Head Handle the Touch Control Board only by the edges are subject to failure if static electricity is trans- of the glass and the plastic frame.

  • Page 75: Oven Light

    Lower Oven Section SMW Oven Service Manual up, provided no other key is pushed prior to STOP The test mode is designed to allow quick testing of TIME. The control will immediately enter the test the control inputs and outputs. mode.
  • Page 76 Lower Oven Section SMW Oven Service Manual KEY PRESSED ACTION Stop Time Speaker will beep. Clock All the display segments are lit. Cook Time Any error codes stored in the EEPROM will be displayed. The time digits will display the last display head error code.

  • Page 77: Sequence Of Operation

    Lower Oven Section SMW Oven Service Manual SEQUENCE OF OPERATION Lower Oven Bake Cycle — Bake Preheat & Bake Mode Press the BAKE keypad and select an oven temperature and the following events will occur on the relay board: • Line Relay K8 closes. •...

  • Page 78: Broil Cycle - Broil Preheat And Broil Mode

    Lower Oven Section SMW Oven Service Manual Broil Cycle — Broil Preheat & Broil Mode Press the BROIL keypad and select an oven temperature and the following events will occur on the relay board: • Line Relay K8 closes. • Cooling Fan Relay K6 closes and turns the Cooling Fan on. •...

  • Page 79: Convection Cycle - Convection Preheat And Convection Mode

    Lower Oven Section SMW Oven Service Manual Convection Cycle – Convection Preheat & Convection Mode Press the CONVECTION keypad and select an oven temperature and the following events will occur on the relay board: • Line Relay K8 closes. • Cooling Fan Relay K6 closes and turns the Cooling Fan on. •...

  • Page 80: Convection Roast Preheat

    Lower Oven Section SMW Oven Service Manual Convection Roast Cycle — Convection Roast Preheat Press the CONVECTION ROAST keypad and select an oven temperature and the following events will occur on the relay board: • Line Relay K8 closes. • Cooling Fan Relay K6 closes and turns the Cooling Fan on. •...

  • Page 81: Convection Roast Cycle

    Lower Oven Section SMW Oven Service Manual Convection Roast Cycle NOTE: The Convection Roast cycle is a continuation of the Convection Roast Preheat cycle. Press the CONVECTION ROAST keypad and the following events will occur on the relay board: • The L1 Relay connects L1 line voltage to the Convection and Bake Elements. •...

  • Page 82: Self-Clean Cycle - Preheat Below 840

    Lower Oven Section SMW Oven Service Manual ˚ Self-Clean Cycle — Preheat Below 840 Press the SELF-CLEAN keypad and select a self-clean time period and the following events will occur on the relay board: • Line Relay K8 closes. • Cooling Fan Relay K6 closes and turns the Cooling Fan on. •...

  • Page 83: Self-Clean Cycle

    Lower Oven Section SMW Oven Service Manual Self-Clean Cycle NOTE: The Self-Clean cycle is a continuation of the Self-Clean Preheat cycle. Press the SELF-CLEAN keypad and the following events will occur on the relay board: • The L1 Relay connects L1 line voltage to the Bake and Broil Elements. •...
  • Page 84 Thermador Customer Support Call Center, 5551 McFadden Avenue, Huntington Beach, CA 92649 • 800/735-4328 ECO12436 • 94-30-008A • © 2000 Thermador • Litho U.S.A. 2/00...

This manual is also suitable for:

Smw272sSmw272pSmw272w

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