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Thermador CM301B Service Manual
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Thermador CM301B Service Manual

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SERVICE MANUAL
for
®
THERMADOR
BUILT-IN OVENS
Model CM302S
MODELS:
CM301B / CM301W / CM301S
CM302B / CM302W / CM302S
Lit. No. 94-30-006B
August, 2000

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Summary of Contents for Thermador CM301B

  • Page 1 SERVICE MANUAL ® THERMADOR BUILT-IN OVENS Model CM302S MODELS: CM301B / CM301W / CM301S CM302B / CM302W / CM302S Lit. No. 94-30-006B August, 2000...

  • Page 2: Table Of Contents

    20-Ampere Fuse, Fuse Failure .......... 65 Measuring For Microwave Radiation Leakage .... 6-7 Diode, High Voltage Transformer, Magnetron Tube ..66 Thermador Warranty ............8 Microwave Board, Stirrer Motor, Microwave Transformer Cooling Fan & Air Switch ......67 Servicing Components ............. 9 CM Lower Oven ........

  • Page 3: General

    CM302B / CM302W / CM302S THIS MANUAL IS DESIGNED TO BE USED ONLY BY QUALIFIED SERVICE PER- SONNEL. THERMADOR RECOMMENDS THAT CUSTOMERS DO NOT SERVICE THEIR OWN UNITS, DUE TO THE COMPLEXITY AND THE RISK OF HIGH- VOLTAGE ELECTRICAL SHOCK.

  • Page 4: Symbols You Will See In The Manual

    THERMADOR ASSUMES NO RESPONSIBILITY FOR ANY REPAIRS M A D E O N O U R P R O D U C T S B Y A N Y O N E O T H E R T H A N AUTHORIZED THERMADOR SERVICE TECHNICIANS.

  • Page 5: Avoid Exposure To Excessive Microwave Energy

    Lit. No. 94-30-006B CM Oven Service Manual TO AVOID EXPOSURE TO EXCESSIVE MICROWAVE ENERGY Observe these precautions before and during servicing: Do not operate or allow the oven to be operated with the door open. Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary: a) Interlock Operation.

  • Page 6: Cautions To Observe When Troubleshooting

    CM Oven Service Manual Lit. No. 94-30-006B CAUTIONS TO OBSERVE WHEN TROUBLESHOOTING Unlike many other appliances, the microwave oven is high-voltage, high-current equipment. Although it is free from danger in ordinary use, extreme care should be taken during repair. CAUTION Remove your wristwatch when working close to or when replacing the magnetron.

  • Page 7: Avoid Electrical Shock

    Lit. No. 94-30-006B CM Oven Service Manual WARNING To Avoid Electrical Shock: • Disconnect the power to the appliance before servicing. • For those checks requiring the use of elec- trical power, exercise extreme care. • Do not attempt high-voltage tests. RESPECT HIGH-VOLTAGE Page 5...

  • Page 8: Measuring For Microwave Radiation Leakage

    • To prevent false readings, hold the test more than 5 mw/cm inform probe by the grip portion of the handle Thermador immediately. After only, and move it along the shaded area shown in the following illustration. repairing or replacing any radiation safety device, keep a written record •...
  • Page 9 Thermador and inform the owner and after all necessary components are that the microwave cannot be used. replaced or adjusted. Special care should 7.

  • Page 10: Thermador Warranty

    THERMADOR DOES NOT ASSUME ANY RESPONSIBILITY FOR INCIDENTAL OR CONSE- QUENTIAL DAMAGES. Some states do not allow the exclusions or limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you. This war- ranty gives you specific legal rights.

  • Page 11: Servicing Components

    Lit. No. 94-30-006B CM Oven Service Manual SERVICING THE COMPONENTS COMPONENT LOCATIONS shown below. Refer to the pages that show the The serviceable components for the upper (or components you wish to service. single) oven and plenum are included in this section of the manual.

  • Page 12: Removing Trim, & Top Plenum Covers

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE TRIM, AND TOP PLENUM COVERS WARNING To remove the trim, remove the two end screws. Turn off the electrical power going to the To remove the top front plenum cover: oven before servicing. a) Remove the five screws.

  • Page 13: Removing Electronic Oven Control Board

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING THE ELECTRONIC OVEN CONTROL BOARD WARNING Remove the six screws from the electronic oven control board. Turn off the electrical power going to the 3 Screws oven before servicing. CAUTION When you work on the oven, be careful when handling the sheet metal parts.

  • Page 14: Removing Fuseblock & Microwave Pcb Control

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE FUSEBLOCK & MICROWAVE PCB CONTROL WARNING BK-126 Turn off the electrical power going to the oven before servicing. CAUTION 20 Amp Fuse Screw When you work on the oven, be careful when handling the sheet metal parts.

  • Page 15: Removing Light Transformer

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING THE LIGHT TRANSFORMER & DOUBLE LINE BREAK RELAY WARNING Turn off the electrical power going to the oven before servicing. CAUTION When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cut YL-83 YL-82...

  • Page 16: Removing Stirrer Motor

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE STIRRER MOTOR WARNING Remove the two mounting screws from the stirrer motor bracket, lift the motor, Turn off the electrical power going to the and slide the coupling out of the stirrer oven before servicing.

  • Page 17: Transformer Air Switch Assembly

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING THE TRANSFORMER COOLING FAN AND M/W TRANSFORMER AIR SWITCH ASSEMBLY WARNING c) Remove the four fan mounting screws from the bracket. Turn off the electrical power going to the M/W Transformer oven before servicing. Air Switch CAUTION When you work on the oven, be careful...

  • Page 18: Removing Magnetron Fan Assembly

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE MAGNETRON FAN ASSEMBLY WARNING Disconnect the wires from the terminals of the magnetron fan assembly. Turn off the electrical power going to the Remove the two fan assembly bracket oven before servicing. screws from the plenum and remove the CAUTION assembly.

  • Page 19: Removing Crossflow Top Cooling Blower

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING THE CROSSFLOW TOP COOLING BLOWER WARNING Disconnect the wires from the terminals of the crossflow top cooling blower. Turn off the electrical power going to the Remove the two screws from the blower oven before servicing.

  • Page 20: Removing High Voltage Microwave Capacitor

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE HIGH VOLTAGE MICROWAVE CAPACITOR WARNING Disconnect the wires from the terminals of the high voltage microwave capacitor. Turn off the electrical power going to the oven before servicing. Remove the capacitor mounting bracket screw and remove the bracket and capaci- CAUTION tor from the transformer side shield.

  • Page 21: Removing High Voltage Diode

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING THE HIGH VOLTAGE DIODE WARNING Disconnect the wires from the terminals of the high voltage diode. Turn off the electrical power going to the Remove the mounting screw from the di- oven before servicing. ode and remove the diode from the shield.

  • Page 22: Removing High Voltage Microwave Transformer

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE HIGH VOLTAGE MICROWAVE TRANSFORMER WARNING Remove the four mounting screws from the heat sink bracket and remove the Turn off the electrical power going to the bracket from the top of the transformer. oven before servicing.
  • Page 23 Lit. No. 94-30-006B CM Oven Service Manual Remove the four mounting screws from Remove the heat sink plate from the top the high voltage microwave transformer of the high voltage microwave trans- and remove the transformer from the former. oven. 10.

  • Page 24: Removing Magnetron, & Magnetron Thermal Cutout

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE MAGNETRON, & MAGNETRON THERMAL CUTOUT WARNING To remove the magnetron: a) Disconnect the wires from the two ter- Turn off the electrical power going to the minals. oven before servicing. b) Remove the two screws from the vent CAUTION cover and remove the cover.
  • Page 25 Lit. No. 94-30-006B CM Oven Service Manual d) Remove the two pieces of insulation c) Repeat steps a and b for screws #3 and from the top of the waveguide. #4 so that all four screws are loosely installed. d) Alternately tighten screws #1 through #4 until they are snug.

  • Page 26: Removing Control Panel Assembly

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE CONTROL PANEL ASSEMBLY, DISPLAY BOARD, & TOUCH PANEL GLASS WARNING c) Disconnect the cables from the touch panel glass filter board connectors. Turn off the electrical power going to the d) Remove the nine indicated screws from oven before servicing.

  • Page 27: Removing Upper (Or Single) Oven Door Switch

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING THE UPPER (OR SINGLE) OVEN DOOR SWITCH WARNING Pull the upper latch plate forward and push the oven door switch out of the Turn off the electrical power going to the mounting hole. oven before servicing.

  • Page 28: Monitor & Secondary Switch Assembly

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE DOOR LATCH ASSEMBLY, HIGH-TEMP CUTOUT, AND THE MONITOR & SECONDARY SWITCH ASSEMBLY WARNING Disconnect the five cables from the touch glass filter board connectors at P2, P4, P6, Turn off the electrical power going to the P10, and P11 and remove the control panel oven before servicing.
  • Page 29 Lit. No. 94-30-006B CM Oven Service Manual To remove the high-temp cutout: 10. To remove the monitor and secondary switch assembly: a) Use an angled 1/4˝ socket and remove the two hex-head screws from the a) Use an angled screwdriver and remove high-temp cutout bracket.

  • Page 30: Removing A Halogen Light Assembly

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING A HALOGEN LIGHT ASSEMBLY WARNING Screw Turn off the electrical power going to the (1 of 4) oven before servicing. Lens Holder CAUTION & Lens When you work on the oven, be careful when handling the sheet metal parts.
  • Page 31 Lit. No. 94-30-006B CM Oven Service Manual Cut the leads of the new light assembly approximately 3˝ from the body. Tech Tips!! 10. Remove 3/8˝ of insulation from the cut lead ends and the wiring harness. When you reassemble the halogen light as- 11.

  • Page 32: Removing Broil Element & Stirrer Blade Assembly

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE BROIL ELEMENT AND STIRRER BLADE ASSEMBLY WARNING b) Carefully pull the broil element for- ward so that the terminals and wires Turn off the electrical power going to the slide through the holes in the liner. oven before servicing.
  • Page 33 Lit. No. 94-30-006B CM Oven Service Manual b) Remove the two screws from the stir- c) Using one of the mounting screw ac- rer glass bracket, and remove the cess holes in the stirrer blade, remove bracket and glass. the eight screws from the stirrer blade assembly and remove the assembly.

  • Page 34: Removing Waveguide

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE WAVEGUIDE WARNING Remove the waveguide screws (#14-91- 142). Turn off the electrical power going to the Waveguide Screws (1 of 14) oven before servicing. CAUTION When you work on the oven, be careful when handling the sheet metal parts.
  • Page 35 Lit. No. 94-30-006B CM Oven Service Manual 10. Lift the back of the stirrer motor platform 11. Clear any insulation away from the area just high enough to remove the wave- that the waveguide will be mounted in so guide from underneath it. that the screw holes will align properly when the waveguide is installed.

  • Page 36: Removing Convection Element & Motor

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE CONVECTION ELEMENT & CONVECTION MOTOR WARNING To remove the convection element: a) Remove the eight screws from the con- Turn off the electrical power going to the vection element. oven before servicing. 8 Screws Convection Element CAUTION...
  • Page 37 Lit. No. 94-30-006B CM Oven Service Manual To remove the convection motor: Rear Shield Cover a) Remove the nut from the convection Plate fan blade and remove the blade and flat washer from the motor shaft. Convection Fan Blade Screw (1 of 15) c) Remove the 15 motor mounting screws from the rear shield cover plate and remove the plate.
  • Page 38 CM Oven Service Manual Lit. No. 94-30-006B e) Remove the insulation from the motor f) Remove the three screws from the con- and convection motor bracket. vection motor bracket and remove the bracket from the motor. Convection Top Screw Motor Bracket Insulation Top Screw Tech Tip!!

  • Page 39: Removing Meat Probe Jack

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING THE MEAT PROBE JACK WARNING Remove the piece of insulation that is cov- ering the meat probe jack. Turn off the electrical power going to the Pull the meat probe jack and flat washer oven before servicing.

  • Page 40: Removing The Hidden Bake Element

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE HIDDEN BAKE ELEMENT Remove the wire wraps from the vertical WARNING support holes and wrap them around the Turn off the electrical power going to the wire bundles at the same four locations. oven before servicing.
  • Page 41 Lit. No. 94-30-006B CM Oven Service Manual Remove the four bracket screws from the 12. Bend the flange covering the hidden bake lower crossflow blower assembly and re- element down as necessary to remove the move the assembly from the oven. element.

  • Page 42: Removing Oven Thermal Sensor

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE OVEN THERMAL SENSOR WARNING Pull the oven thermal sensor forward un- til the wire splices are inside the oven. Turn off the electrical power going to the oven before servicing. Cut Wires CAUTION Here When you work on the oven, be careful...

  • Page 43: Removing Upper (Or Single) Oven Door Gasket

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING THE UPPER (OR SINGLE) OVEN DOOR GASKET Fully open the oven door. Pull the ends of the oven door gasket out of the hole in the door liner. Unclip the gasket from the door liner and remove it.

  • Page 44: Removing, Reinstalling Microwave Oven Door

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING AND REINSTALLING THE MICROWAVE OVEN DOOR REMOVING THE OVEN DOOR Fully open the oven door. CAUTION: Be careful handling the oven door when removing it, as it is very heavy. Never lift the door by the handle. Pull the oven out of its mounting location so that you can access the left and right hinge pocket covers (see the following...
  • Page 45 Lit. No. 94-30-006B CM Oven Service Manual Grasp the oven door by the sides near the REINSTALLING THE OVEN DOOR top, and carefully close it until the hook Hold the oven door by the sides approxi- in the hinge contacts the hinge support mately 2/3 of the way down and insert (approximately 3/4 of the way).
  • Page 46 CM Oven Service Manual Lit. No. 94-30-006B Lower the oven door to its fully open po- sition. Tech Tip!! Rotate the U-clips on the hinges forward to the unlocked position. Make sure that the door seal is tight against the front of the oven liner and that the door Rotate U-Clip is not crooked.

  • Page 47: Removing Upper (Or Single) Oven Door Handle & Outer Glass Assembly

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING THE UPPER (OR SINGLE) OVEN DOOR HANDLE & OUTER GLASS ASSEMBLY CAUTION To remove the outer oven door glass: a) Remove the four screws from the left When you work on the oven, be careful and right glass support brackets and when handling the sheet metal parts.

  • Page 48: Removing An Oven Door Hinge, Actuator Arm, Center Glass, Rf Screen, & Inner Glass

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING AN OVEN DOOR HINGE, ACTUATOR ARM, CENTER GLASS, RF SCREEN, & INNER GLASS To remove the actuator arm: CAUTION a) Remove the four screws from the baffle When you work on the oven, be careful and remove the baffle.
  • Page 49 Lit. No. 94-30-006B CM Oven Service Manual b) Remove the insulation strip from To remove the RF screen and the inner around the center glass assembly. glass: a) Remove the bottom insulation from the Center Glass Assembly door. b) Remove the forty-eight screws from the screen and remove the screen from over the inner glass .
  • Page 50 CM Oven Service Manual Lit. No. 94-30-006B Service Tech Tip!! Alert!! The center glass is heat-treated and has the letters “HB” stamped in two places near one After reinstalling the oven door, check of the edges. around the door for microwave radiation leakage.

  • Page 51: Troubleshooting

    Lit. No. 94-30-006B CM Oven Service Manual TROUBLESHOOTING TESTING THE COMPONENTS Resistance Measurements WARNING TO AVOID ELECTRICAL SHOCK DISCONNECT THE POWER TO THE APPLIANCE BEFORE TESTING. TRANSFORMER COOLING 20A TIME-DELAY FUSE FAN MOTOR 20A Time Touch Metal Caps Terminals Delay Fuse Refer to Page 12 to access the 20A time-delay fuse.

  • Page 52: Light Transformer, Double Line Break Relay

    CM Oven Service Manual Lit. No. 94-30-006B LIGHT TRANSFORMER DOUBLE LINE BREAK RELAY Switch (N.O.) Secondary Solenoid Terminals Primary Terminals Refer to Page 13 to access the double line break relay. To test the double line break relay, per- Refer to Page 13 to access the light transformer. form the following steps.

  • Page 53: Stirrer Motor, High Voltage Diode

    Lit. No. 94-30-006B CM Oven Service Manual STIRRER MOTOR HIGH VOLTAGE DIODE Cathode (–) Connectors Anode (+) Diode Symbol CAUTION: DISCHARGE THE HIGH VOLT- Refer to Page 14 to access the stirrer motor. To AGE CAPACITOR BEFORE TESTING THE test the stirrer motor, perform the following DIODE.

  • Page 54: High Voltage Capacitor, High Voltage Transformer

    CM Oven Service Manual Lit. No. 94-30-006B HIGH VOLTAGE CAPACITOR HIGH VOLTAGE TRANSFORMER Terminals Tan Lead Primary Orange Leads (secondary) Terminals CAUTION: DISCHARGE THE HIGH VOLT- (secondary) AGE CAPACITOR BEFORE TESTING IT. CAUTION: DISCHARGE THE HIGH VOLT- REFER TO PAGE 18 FOR THE PROCEDURE. AGE CAPACITOR BEFORE TESTING THE TRANSFORMER.

  • Page 55: Magnetron, Magnetron Thermal Cutout (Tco)

    Lit. No. 94-30-006B CM Oven Service Manual MAGNETRON MAGNETRON THERMAL CUTOUT (TCO) Reset Button Terminals Filament Terminals CAUTION: DISCHARGE THE HIGH VOLT- AGE CAPACITOR BEFORE TESTING THE MAGNETRON THERMAL CUTOUT. RE- CAUTION: DISCHARGE THE HIGH VOLT- FER TO PAGE 18 FOR THE PROCEDURE. AGE CAPACITOR BEFORE TESTING THE MAGNETRON.

  • Page 56: Magnetron Fan Motor, Crossflow Blower Motor

    CM Oven Service Manual Lit. No. 94-30-006B MAGNETRON FAN MOTOR CROSSFLOW BLOWER MOTOR Terminals Terminals Refer to Page 16 to access the magnetron fan Refer to Page 17 to access the crossflow blower. motor. To test the motor, perform the follow- To test the motor, perform the following steps.

  • Page 57: Door Latch Assembly

    Lit. No. 94-30-006B CM Oven Service Manual DOOR LATCH ASSEMBLY MONITOR & SECONDARY SWITCHES Latch Interlock Switch Latch Motor (N.O.) Terminals Terminals Monitor Switch (N.C.) Terminals Secondary Switch Door Unlock Switch Door Lock (N.O.) Terminals (N.O.) Terminals Switch (N.O.) Terminals Refer to Page 27 to access the monitor and Refer to Page 26 to access the door latch assem- secondary switches.

  • Page 58: Door Latch Assembly, Monitor & Secondary Switches 55 Door Switch, Oven Thermal Sensor

    CM Oven Service Manual Lit. No. 94-30-006B DOOR SWITCH OVEN THERMAL SENSOR Terminals (N.O.) Refer to Page 40 to access the oven thermal sensor. To test the sensor, perform the follow- Refer to Page 25 to access the door switch. To ing steps.

  • Page 59: Broil Element, Bake Element

    Lit. No. 94-30-006B CM Oven Service Manual BROIL ELEMENT BAKE ELEMENT Terminals Terminals Refer to Page 30 to access the broil element. To Refer to Page 38 to access the bake element. To test the element, perform the following steps. test the element, perform the following steps.

  • Page 60: Convection Element, Convection Motor

    CM Oven Service Manual Lit. No. 94-30-006B CONVECTION ELEMENT CONVECTION MOTOR Terminals Terminals Refer to Page 34 to access the convection ele- Refer to Page 36 to access the convection mo- ment. To test the element, perform the follow- tor. To test the motor, perform the following ing steps.

  • Page 61: M/W Transformer Air Switch, Meat Probe Jack

    Lit. No. 94-30-006B CM Oven Service Manual M/W TRANSFORMER AIR SWITCH MEAT PROBE JACK M/W Transformer Air Switch (N.O.) Terminals Terminals Refer to Page 15 to access the M/W trans- Refer to Page 37 to access the meat probe jack. former air switch.

  • Page 62: Microwave Pcb Control

    CM Oven Service Manual Lit. No. 94-30-006B MICROWAVE PCB CONTROL Header P3: Receives 12-volts AC from the halogen light transformer at pins 1 & 2, and Refer to Page 12 to access the microwave PCB Pins 3 & 4 output 12-volts DC to activate the control.

  • Page 63: Microwave Components Description

    Lit. No. 94-30-006B CM Oven Service Manual MICROWAVE COMPONENTS DESPCRIPTION Switches Fuse Diode (High Voltage) Capacitor (High Voltage) Transformer (High Voltage) Magnetron Tube Microwave PCB Control Stirrer Motor Microwave Cooling Fan Page 61...

  • Page 64: Interlock Switches

    CM Oven Service Manual Lit. No. 94-30-006B The interlock switches The CM Oven has a total of 3 safety switches. The primary switch is mounted on the upper oven latch (latch interlock switch). The other two switches are mounted in the upper plenum behind and below the control panel. These switches are the monitor and secondary switch.

  • Page 65: Oven Mounted Switches

    Lit. No. 94-30-006B CM Oven Service Manual Oven Mounted Switches The secondary and the monitor switches are mounted on a bracket. The bracket is located on the plenum behind the control panel on the right side of the oven (see Front View, below). Front View Monitor Switch Secondary...

  • Page 66: Switches Activated By Hook

    CM Oven Service Manual Lit. No. 94-30-006B Switches Activated by Hook The switches are activated by a spring action hook on the microwave oven door. When the door is closed, the hook contacts and activates the switches (see illustration, below). Switches Door Hook...

  • Page 67: 20-Ampere Fuse, Fuse Failure

    Lit. No. 94-30-006B CM Oven Service Manual 20 AMPERE FUSE The Microwave Oven is protected from interlock switch failure by a 20 ampere Fuse. A defective switch or any other factor causing an overload on the microwave circuit will blow the fuse and stop the operation of the microwave section of the oven. The fuse is located in a fuse holder in the upper plenum.

  • Page 68: Diode, High Voltage Transformer, Magnetron Tube

    CM Oven Service Manual Lit. No. 94-30-006B DIODE The diode is a device used to convert alternating current (AC) into pulsating direct current (DC) allowing it to pass forward in one direction while blocking the current flow in the opposite direction. There is no charge stored in this part. HIGH VOLTAGE TRANSFORMER The high voltage transformer has one primary winding and two secondary windings.

  • Page 69: Microwave Board, Stirrer Motor, Microwave Transformer Cooling Fan & Air Switch

    Lit. No. 94-30-006B CM Oven Service Manual MICROWAVE BOARD The Microwave Board has one snap relay (K1).; Two Pin Headers (P1 and P3) and two 1/4” terminals (P2-1 and P2-2). K1 Relay: This relay transfers 120 Volts AC to the high voltage transformer to activate the micro- wave circuit.

  • Page 70: "Cm" Lower Oven

    CM Oven Service Manual Lit. No. 94-30-006B “CM” Lower Oven Page 68...

  • Page 71: "Cm" Relay Board Matrix

    Lit. No. 94-30-006B CM Oven Service Manual “CM” RELAY BOARD MATRIX REPLAY FUNCTION Upper Oven Latch Motor Lower Oven Latch Motor None None Upper Oven Cooling Motor Lower Oven Cooling Motor Upper Oven Halogen Lamp Lower Oven Halogen Lamp Upper Oven Bake Element Upper Oven Broil Element Upper Oven Convection Element Upper Oven Convection Motor...

  • Page 72: "Cm" Dac Relay Board

    CM Oven Service Manual Lit. No. 94-30-006B “CM” DAC RELAY BOARD (Digital Appliance Controls) There are 2 relay boards, 1 for a single oven and 1 for a double oven. You can use the double oven board for a single oven. You must use a double oven board for a double oven. The relay board has 14 snap relays activated by 24 volts d.c., 8 small pin headers that carry signal voltage to components, and 5 large pin headers that provide or transfer 120 volts ac to components.
  • Page 73 Lit. No. 94-30-006B CM Oven Service Manual DAC RELAY BOARD (continued) The relay board has 8 small pin headers. They are identified as P2, P3, P5, P6, P9, P10, P11, P14, P15. These small pin headers carry signal voltage to specific components.
  • Page 74 CM Oven Service Manual Lit. No. 94-30-006B DAC RELAY BOARD (continued) The relay board has 5 large pin headers. They are identified as P0, P1, P7, P8, P18. These large pin headers carry current to specific components. The pin numberts are identified on the schematic. P0 large pin header has 8 pins and are identified as follows;...
  • Page 75 Lit. No. 94-30-006B CM Oven Service Manual DAC RELAY BOARD (continued) P7 large pin header has 4 pins and are identified as follows; P7-1 Blank P7-2 Blank P7-3 Current from L2 to K11 relay P7-4 Current to upper oven convection motor P8 large pin header has 4 pins and are identified as follows;...

  • Page 76: Wire Harness

    CM Oven Service Manual Lit. No. 94-30-006B Explanation of the Wire Harness Connector Housing Wires The wire harness is shown in the illustration above. PIN Header PIN Header The wire harness’ slide onto the pin headers of the relay board, display head, and touch control boards.

  • Page 77: Wire Harnesses

    Lit. No. 94-30-006B CM Oven Service Manual Wire Harnesses (Continued) The “CM” oven uses 5 wire harnesses to transfer signal voltage between the DAC control (relay board), display head, and touch control boards (glued on the glass). The 5 wire harness’ connect to the corresponding pin headers on the corresponding components (relay board, display head, touch control board).

  • Page 78: Troubleshooting Chart For

    CM Oven Service Manual Lit. No. 94-30-006B Troubleshooting chart for relay board header pin failures Wire harness off at pin header; or circuits open: Lower oven sensor: Control functions normal. When sensor opens, f-61 code will appear. If sensor shorts, f-60 will appear. Cooling fan is on constantly.
  • Page 79 Lit. No. 94-30-006B CM Oven Service Manual Relay board transformer: No fail code, no display at all. Board is dead. Both cooling motors and halogen lights: Will accept modes. In about 45 seconds F-34 will appear in the upper oven or F-64 will appear in the lower oven because the Coolingmotors did not come on to close the air switches and signal the board.

  • Page 80: "Cm" Oven Control Panel

    CM Oven Service Manual Lit. No. 94-30-006B MICROWAVE PROBE CONVECTION BAKE UPPER LIGHT PANEL LOCK CLOCK LOWER COOKSMART SELF CLEAN BROIL ROAST UPPER TIMER 1 TIMER OFF TIMER 2 1-2-3-4 PAUSE PROOF STOP COOK LOWER CS+3 - BREAD, DESSERT SMALL ROAST/POULTRY START RESUME DEHYDRATE...

  • Page 81: Electronic Oven Controls

    Lit. No. 94-30-006B CM Oven Service Manual ELECTRONIC OVEN CONTROLS HANDLING THE BOARDS Touch Control Board The Touch Control Board and the Display Handle the Touch Control Board only by the Head are subject to failure if static electricity is edges of the glass and the plastic frame.

  • Page 82: Control Panel Assembly

    CM Oven Service Manual Lit. No. 94-30-006B Control Panel Assembly The control panel assembly is comprised of the following parts; Control panel: There are a total of 6 control panels. 2 black, 2 white and 2 stainless. The control panels are what determines the color of the unit. Curved glass touch panel: There are 2 glass touch panels.

  • Page 83: Glass Touch Panel

    Lit. No. 94-30-006B CM Oven Service Manual Glass touch panel The glass touch panel is comprised of a piece of curved glass with 2 control boards glued onto it. Left side touch control board: The large touch control board is glued on the left side of the curved glass.

  • Page 84: Display Head

    CM Oven Service Manual Lit. No. 94-30-006B Display Head The display head has a total of 8 pin headers (0nly 7 are used), they are identified as P1, P2, P4, P6, P8, P10 and P11. P1 pin header has 18 pins and connects to the large touch control board (P1).

  • Page 85: Troubleshooting Chart For Display Head Pin Failures

    Lit. No. 94-30-006B CM Oven Service Manual Troubleshooting chart for display head pin header failures Wire harness off at pin header or open circuits Accepts display signals from relay board: Glass control panel is completely dead. No display, circuit must be reset. Accepts communication signals from relay board: Glass control panel is completely dead.

  • Page 86: Cm Lower Oven Illustration

    CM Oven Service Manual Lit. No. 94-30-006B CM LOWER OVEN Bracket Screws Broil Element Brackets BACK OF LINER Hidden Bake Element Under Oven Liner Broil Element 2 Top Front Mounting Screws White Wires Access Panel Cover Hex Nut Meat Probe Jack Page 84...

  • Page 87: Removing Hidden Bake Element

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING THE HIDDEN BAKE ELEMENT (LOWER OVENS ONLY) WARNING Refer to Figure B (Page 86) for the following steps. Turn off the electrical power circuit to Unwrap and remove the indicated wire the oven at the main junction box be- tie from the support bracket.
  • Page 88 CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE HIDDEN BAKE ELEMENT (LOWER OVENS ONLY) Support Bracket Remove Screws Rear Panel Bake Element Remove Wires Remove Screws 3 Screws Wire Tie Flange Flange FigureA Remove 6 Screws Figure B Bend Flange Bend Flange Down Down...

  • Page 89: Removing The Oven Temperature Sensor

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING THE OVEN TEMPERATURE SENSOR WARNING Remove the screws from the bracket and pull the oven temperature sensor forward Turn off the electrical power circuit to the until the wire connectors are through the oven at the main junction box before ser- opening.

  • Page 90: Removing The Convection Bake Element

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE CONVECTION BAKE ELEMENT WARNING door (see Page 99). Remove the racks from the oven. Turn off the electrical power circuit to the oven at the main junction box before ser- Remove the front screws from the left and vicing this unit.

  • Page 91: Removing A Convection Fan Motor

    Lit. No. 94-30-006B CM 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- Turn off the electrical power circuit to the rotating threads. oven at the main junction box before ser- vicing this unit.
  • Page 92 CM Oven Service Manual Lit. No. 94-30-006B 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 Page 90...

  • Page 93: Removing A Halogen Lamp Holder

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING A HALOGEN LAMP HOLDER WARNING Turn off the electrical power circuit to the Halogen oven at the main junction box before ser- Lamp vicing this unit. Lamp Holder CAUTION When you work on the oven, be careful when handling the sheet metal parts.

  • Page 94: Removing Lamp Transformer

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE LAMP TRANSFORMER & LOWER OVEN DOUBLE LINE BREAK RELAY WARNING To remove an old oven relay (see Illustration, below): 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 95: Removing Oven Light Switch, Oven Door Latch Assembly And High Temp Cut-Out

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING the OVEN LIGHT SWITCH, the OVEN DOOR LATCH ASSEMBLY and the HI-TEMP CUTOUT in LOWER OVEN WARNING To remove the oven door latch assembly (see Inset 2, Page 94): Turn off the electrical power circuit to the a) Use a 1/4"...
  • Page 96 CM Oven Service Manual Lit. No. 94-30-006B REMOVING the OVEN LIGHT SWITCH, the OVEN DOOR LATCH ASSEMBLY and the HI-TEMP CUTOUT Inset 1 NORMALLY OPEN TECH (GOLD) CONTACTS DOOR OPEN = SWITCH OPEN TIP!! NORMALLY CLOSED DOOR OPEN = SWITCH CLOSED You will need the following tools to remove the components: 1/4"...

  • Page 97: Removing The Air Switches

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING THE AIR SWITCHES WARNING Turn off the electrical power to the oven. Open the lower oven door. The bottom Turn off the electrical power circuit to the trim mounting screws (see Inset 1, Page oven at the main junction box before ser- 96) are visible at each side of the oven vicing this unit.

  • Page 98: Side View

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE AIR SWITCHES 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 Upper Oven Air Switch Mounting Air Switch Bracket...

  • Page 99: Removing A Blower

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING A BLOWER WARNING e) Disconnect the four wires from the mo- tor terminals. Turn off the electrical power circuit to the f) Install the new blower in the mounting oven at the main junction box before ser- bracket and mount the assembly to the vicing this unit.
  • Page 100 CM Oven Service Manual Lit. No. 94-30-006B REMOVING A BLOWER BACK OF PLENUM Mounting Bracket Screw Screw Lt. Blue (97) Screw White (98) White Dk. Blue Upper Blower (24) (23) Upper Blower Figure A Lower Blower Figure B Blower Wire (24) To Blower Wire (23) To Upper Blower Motor Upper Blower Motor...

  • Page 101: Removing Lower Oven Door

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING AN OVEN DOOR Refer to the illustration below for the follow- To remove the door: ing steps. a) Grasp the door by the sides toward the Open the door to its fully open position. back and raise the front of the door sev- eral inches (there will be some resis- Raise the hinge latch over the hook on each...

  • Page 102: Removing Oven Door Gasket

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE OVEN DOOR GASKET attached to the gasket out of the holes in CAUTION the oven door (see Inset 2 on the illustra- tion). When you work on the oven, be careful Position the new fiberglass gasket around when handling the sheet metal parts.

  • Page 103: Removing Oven Door Components

    Lit. No. 94-30-006B CM Oven Service Manual REMOVING THE OVEN DOOR COMPONENTS To remove any of the oven door compo- CAUTION nents, remove the oven door from the oven (see Page 99). When you work on the oven, be careful Refer to illustration, below, as you remove when handling the sheet metal parts.

  • Page 104: Removing Oven Module

    CM Oven Service Manual Lit. No. 94-30-006B REMOVING THE OVEN MODULE (30") Convection Kit—#35-00-687 Turn off the electrical power to the oven. WARNING To make servicing easier, remove the oven Turn off the electrical power circuit to the door (see Page 99). oven at the main junction box before ser- Remove the oven from the wall.

  • Page 105: Troubleshooting

    Lit. No. 94-30-006B CM 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 AIR SWITCH THE BLOWER MOTOR Refer to Page 97 to access the blower motor.

  • Page 106: Convection Fan Motor, Lamp Transformer

    CM Oven Service Manual Lit. No. 94-30-006B THE CONVECTION FAN MOTOR THE LAMP TRANSFORMER Refer to Page 89 to access the convection fan Refer to Page 92 to access the lamp transformer. motor. With no power applied, remove the wires With no power applied, disconnect the mo- from the terminals of the lamp transformer.

  • Page 107: Oven Door Latrch Assembly

    Lit. No. 94-30-006B CM Oven Service Manual THE OVEN DOOR LATCH ASSEMBLY The oven door latch locks the oven door during the If the reading is not correct, remove and re- CLEAN cycle (see the illustration at the bottom of place the switch.

  • Page 108: Hidden Bake Element, Broil Element

    CM Oven Service Manual Lit. No. 94-30-006B THE HIDDEN BAKE THE BROIL ELEMENT ELEMENT Refer to Page 30 to access the broil element. With no power applied, remove the wires Refer to Pages 85 and 86 to access the bake element. from the terminals of the broil element.

  • Page 109: Convection Bake Element, Hi-Temp Cutout

    Lit. No. 94-30-006B CM Oven Service Manual THE CONVECTION THE HI-TEMP CUTOUT BAKE ELEMENT The hi-temp cutout contacts open at or above 350˚F ±8˚, and are manually reset by pressing the reset Refer to Page 88 to access the convection bake button.

  • Page 110: Fault Codes

    CM Oven Service Manual Lit. No. 94-30-006B Fault Codes CODE FAULT DETECTION Power board incompatibility Communication error with power board Vcc lift-off (power board) Power board not calibrated Display board EEPROM error Misc. power board error Upper oven cancel key shorted high Lower oven cancel key shorted high Upper oven cancel key shorted low Lower oven cancel key shorted low...

  • Page 111: Schematic & Wiring Diagrams

    Lit. No. 94-30-006B CM Oven Service Manual CM301 ELECTRONIC OVEN CONTROL WIRING Oven Temp BLANK Sensor (2) WH DBL Line Break Relay OR-09/10 BR-25 RD-91 (4) WH Door & 01-03 Latch Switch CM302 ELECTRONIC OVEN CONTROL WIRING (2) WH BLANK Oven Temp BLANK Sensor...

  • Page 112: Cm301 Wiring Diagram

    CM Oven Service Manual Lit. No. 94-30-006B 5551 McFadden Avenue, Huntington Beach, CA 92649 • 800/735-4328 ECO91450 • 94-30-006B • ©BSH Home Appliances Corp. 2000 • Litho U.S.A. 8/00...

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