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Thermador CM301B Service Manual

Manual is about: built-in

Summary of CM301B

  • Page 1

    Service manual for thermador ® built-in ovens model cm302s cm301b / cm301w / cm301s cm302b / cm302w / cm302s models: lit. No. 94-30-006b august, 2000

  • Page 2: Table of Contents

    Cm oven service manual lit. No. 94-30-006b table of contents general ............................................................................. 1-8 data plate location ........................................................ 1 symbols you will see in the manual ............................ 2 avoi...

  • Page 3: General

    Cm oven service manual lit. No. 94-30-006b page 1 general data plate location data plate (behind oven cooling vent, right side) the cm oven service manual contains information that is neces- sary for servicing the thermador ® built-in oven models: cm301b / cm301w / cm301s cm302b / cm302w / cm302s th...

  • Page 4: Service

    Cm oven service manual lit. No. 94-30-006b page 2 and proper operation and servicing of the oven, follow the instructions carefully each time you see one of the symbols. The following symbols are provided through- out this manual. For reasons of personal safety symbols you will see in the manual the...

  • Page 5: To Avoid Exposure to

    Cm oven service manual lit. No. 94-30-006b page 3 to avoid exposure to excessive microwave energy observe these precautions before and during servicing: 1. Do not operate or allow the oven to be operated with the door open. 2. Make the following safety checks on all ovens to be serviced before activ...

  • Page 6: Caution

    Cm oven service manual lit. No. 94-30-006b page 4 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. There is high-voltage pres...

  • Page 7: Warning

    Cm oven service manual lit. No. 94-30-006b page 5 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 8: Warning

    Cm oven service manual lit. No. 94-30-006b page 6 warning check for microwave radiation leakage before and after every servicing. Should the leakage be more than 5 mw/cm 2 inform thermador immediately. After repairing or replacing any radiation safety device, keep a written record for future referen...

  • Page 9: Warning

    Cm oven service manual lit. No. 94-30-006b page 7 i. Pour 275 ± 15 cc (9 oz. ± 1 / 2 oz.) of 20 ± 5ºc (68 ± 9ºf) water in a beaker, graduated to 600 cc, and place the beaker in the center of the oven. 2. Set the radiation monitor to 2450 mhz, and follow the manufacturer ’s recommended test procedure...

  • Page 10: Thermador

    Cm oven service manual lit. No. 94-30-006b page 8 thermador ® warranty thermador will not pay for: 1. Service by an unauthorized agency. Damage or repairs by an unauthorized agency or use of unauthorized parts. 2. Service visits to: • teach you how to use the appliance. • correct the installation. Y...

  • Page 11: Servicing The Components

    Cm oven service manual lit. No. 94-30-006b page 9 servicing the components the serviceable components for the upper (or single) oven and plenum are included in this section of the manual. The components are shown below. Refer to the pages that show the components you wish to service. Component locat...

  • Page 12: Warning

    Cm oven service manual lit. No. 94-30-006b page 10 removing the trim, and top plenum covers warning 1. Turn off the electrical power going to the oven. 2. Pull the oven out of its mounting location so that you can access the trim and ple- num covers. Caution turn off the electrical power going to th...

  • Page 13: Warning

    Cm oven service manual lit. No. 94-30-006b page 11 removing the electronic oven control board warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cut you...

  • Page 14: Removing The Fuseblock

    Cm oven service manual lit. No. 94-30-006b page 12 removing the fuseblock & microwave pcb control warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cut...

  • Page 15: & Double Line Break Relay

    Cm oven service manual lit. No. 94-30-006b page 13 removing the light transformer & double line break relay warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and y...

  • Page 16: Removing The Stirrer Motor

    Cm oven service manual lit. No. 94-30-006b page 14 removing the stirrer motor warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cut yourself if you are...

  • Page 17: Warning

    Cm oven service manual lit. No. 94-30-006b page 15 removing the transformer cooling fan and m/w transformer air switch assembly warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp...

  • Page 18: Warning

    Cm oven service manual lit. No. 94-30-006b page 16 removing the magnetron fan assembly warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cut yourself i...

  • Page 19: Warning

    Cm oven service manual lit. No. 94-30-006b page 17 removing the crossflow top cooling blower warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cut your...

  • Page 20: Removing The High Voltage

    Cm oven service manual lit. No. 94-30-006b page 18 removing the high voltage microwave capacitor warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cut ...

  • Page 21: Warning

    Cm oven service manual lit. No. 94-30-006b page 19 removing the high voltage diode warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cut yourself if yo...

  • Page 22: Removing The High Voltage

    Cm oven service manual lit. No. 94-30-006b page 20 removing the high voltage microwave transformer warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cu...

  • Page 23

    Cm oven service manual lit. No. 94-30-006b page 21 8. Remove the four mounting screws from the high voltage microwave transformer and remove the transformer from the oven. 9. Remove the heat sink plate from the top of the high voltage microwave trans- former. 10. Apply a liberal amount of heat sink ...

  • Page 24: Removing The Magnetron, &

    Cm oven service manual lit. No. 94-30-006b page 22 removing the magnetron, & magnetron thermal cutout warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can...

  • Page 25

    Cm oven service manual lit. No. 94-30-006b page 23 8. To remove the magnetron thermal cut- out: a) disconnect the wires (bk-130 & bk131) from the terminals. B) remove the two screws. C) repeat steps a and b for screws #3 and #4 so that all four screws are loosely installed. D) alternately tighten sc...

  • Page 26: Warning

    Cm oven service manual lit. No. 94-30-006b page 24 removing the control panel assembly, display board, & touch panel glass warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edge...

  • Page 27: Oven Door Switch

    Cm oven service manual lit. No. 94-30-006b page 25 removing the upper (or single) oven door switch warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cu...

  • Page 28: Secondary Switch Assembly

    Cm oven service manual lit. No. 94-30-006b page 26 removing the door latch assembly, high-temp cutout, and the monitor & secondary switch assembly warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal par...

  • Page 29

    Cm oven service manual lit. No. 94-30-006b page 27 9. To remove the high-temp cutout: a) use an angled 1/4˝ socket and remove the two hex-head screws from the high-temp cutout bracket. Pull the cut- out forward as far as the wires will al- low. B) disconnect the wires from the termi- nals. 10. To re...

  • Page 30: Warning

    Cm oven service manual lit. No. 94-30-006b page 28 removing a halogen light assembly warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cut yourself if ...

  • Page 31: Tech Tips!!

    Cm oven service manual lit. No. 94-30-006b page 29 9. Cut the leads of the new light assembly approximately 3˝ from the body. 10. Remove 3/8˝ of insulation from the cut lead ends and the wiring harness. 11. Twist two small wire nuts over the ends of the leads. 1. Position the wiring neatly inside th...

  • Page 32: Stirrer Blade Assembly

    Cm oven service manual lit. No. 94-30-006b page 30 removing the broil element and stirrer blade assembly warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you ...

  • Page 33

    Cm oven service manual lit. No. 94-30-006b page 31 c) using one of the mounting screw ac- cess holes in the stirrer blade, remove the eight screws from the stirrer blade assembly and remove the assembly. B) remove the two screws from the stir- rer glass bracket, and remove the bracket and glass. Sti...

  • Page 34: Removing The Waveguide

    Cm oven service manual lit. No. 94-30-006b page 32 removing the waveguide warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cut yourself if you are not...

  • Page 35: Tech Tip!!

    Cm oven service manual lit. No. 94-30-006b page 33 10. Lift the back of the stirrer motor platform just high enough to remove the wave- guide from underneath it. 11. Clear any insulation away from the area that the waveguide will be mounted in so that the screw holes will align properly when the wav...

  • Page 36: Convection Motor

    Cm oven service manual lit. No. 94-30-006b page 34 removing the convection element & convection motor warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can...

  • Page 37

    Cm oven service manual lit. No. 94-30-006b page 35 6. To remove the convection motor: a) remove the nut from the convection fan blade and remove the blade and flat washer from the motor shaft. B) caution: the rear shield cover plate is sealed and tested for microwave emissions at the factory. Do not...

  • Page 38: Tech Tip!!

    Cm oven service manual lit. No. 94-30-006b page 36 e) remove the insulation from the motor and convection motor bracket. F) remove the three screws from the con- vection motor bracket and remove the bracket from the motor. Top screw convection motor bracket top screw insulation 1. After the fan blad...

  • Page 39: Removing The Meat Probe Jack

    Cm oven service manual lit. No. 94-30-006b page 37 removing the meat probe jack warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cut yourself if you a...

  • Page 40: Warning

    Cm oven service manual lit. No. 94-30-006b page 38 removing the hidden bake element warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cut yourself if y...

  • Page 41

    Cm oven service manual lit. No. 94-30-006b page 39 7. Remove the four bracket screws from the lower crossflow blower assembly and re- move the assembly from the oven. 8. Disconnect the two motor wires (bu-74 & wh-75) and remove them from the wire wrap. 12. Bend the flange covering the hidden bake el...

  • Page 42: Warning

    Cm oven service manual lit. No. 94-30-006b page 40 removing the oven thermal sensor warning caution turn off the electrical power going to the oven before servicing. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cut yourself if y...

  • Page 43: Oven Door Gasket

    Cm oven service manual lit. No. 94-30-006b page 41 removing the upper (or single) oven door gasket 1. Fully open the oven door. 2. Pull the ends of the oven door gasket out of the hole in the door liner. 3. Unclip the gasket from the door liner and remove it. Tech tip!! Use a small screwdriver to in...

  • Page 44: Removing and Reinstalling

    Cm oven service manual lit. No. 94-30-006b page 42 removing and reinstalling the microwave oven door 5. Raise the u-clip over the hook on each of the hinges to lock them. This will prevent the hinge from snapping closed when the door is removed. Removing the oven door caution: be careful handling th...

  • Page 45

    Cm oven service manual lit. No. 94-30-006b page 43 reinstalling the oven door 1. Hold the oven door by the sides approxi- mately 2/3 of the way down and insert the hinges into the oven slots near the top as far as possible. Insert hinge into slot near top 6. Grasp the oven door by the sides near the...

  • Page 46: Service

    Cm oven service manual lit. No. 94-30-006b page 44 2. Lower the oven door to its fully open po- sition. 3. Rotate the u-clips on the hinges forward to the unlocked position. 4. Close the oven door. 5. Reinstall the two hinge locking screws. Rotate u-clip forward to unlock after reinstalling the oven...

  • Page 47: Caution

    Cm oven service manual lit. No. 94-30-006b page 45 removing the upper (or single) oven door handle & outer glass assembly caution when you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cut yourself if you are not careful. 3. Lift the door...

  • Page 48: Caution

    Cm oven service manual lit. No. 94-30-006b page 46 removing an oven door hinge, actuator arm, center glass, rf screen, & inner glass caution when you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and you can cut yourself if you are not careful. 1. Re...

  • Page 49

    Cm oven service manual lit. No. 94-30-006b page 47 c) remove the screws from the four insu- lation cover brackets and the four glass assembly clamps and remove the brackets and clamps. B) remove the insulation strip from around the center glass assembly. D) lift the center glass and frame out of the...

  • Page 50: Service

    Cm oven service manual lit. No. 94-30-006b page 48 the center glass is heat-treated and has the letters “hb” stamped in two places near one of the edges. If you are in doubt as to which glass is heat- treated, use an ohmmeter to check it. To do this, set the ohmmeter to the r x 1 scale and touch the...

  • Page 51: Testing The Components

    Cm oven service manual lit. No. 94-30-006b page 49 testing the components resistance measurements warning troubleshooting refer to page 12 to access the 20a time-delay fuse. To test the 20a time-delay fuse, perform the following steps. 1. Turn off the electrical power to the oven. 2. Set the ohmmete...

  • Page 52

    Cm oven service manual lit. No. 94-30-006b page 50 refer to page 13 to access the light transformer. To test the light transformer, perform the fol- lowing steps. 1. Turn off the electrical power to the oven. 2. Set the ohmmeter to the r x 1 scale. 3. Disconnect one of the wires from the bot- tom (p...

  • Page 53

    Cm oven service manual lit. No. 94-30-006b page 51 refer to page 14 to access the stirrer motor. To test the stirrer motor, perform the following steps. 1. Turn off the electrical power to the oven. 2. Set the ohmmeter to the r x 1 scale. 3. Disconnect the stirrer motor wire going to the terminal bl...

  • Page 54

    Cm oven service manual lit. No. 94-30-006b page 52 refer to page 18 to access the high voltage capacitor. To test the high voltage capacitor, perform the following steps. 1. Turn off the electrical power to the oven. 2. Set the ohmmeter to the r x 10k scale. 3. Disconnect the wires from the capacito...

  • Page 55

    Cm oven service manual lit. No. 94-30-006b page 53 magnetron refer to page 22 to access the magnetron. To test the magnetron, perform the following steps. 1. Turn off the electrical power to the oven. 2. Set the ohmmeter to the r x 1 scale. 3. Disconnect the leads from the filament terminals of the ...

  • Page 56

    Cm oven service manual lit. No. 94-30-006b page 54 magnetron fan motor refer to page 16 to access the magnetron fan motor. To test the motor, perform the follow- ing steps. 1. Turn off the electrical power to the oven. 2. Set the ohmmeter to the r x 1 scale. 3. Disconnect one of the leads from the m...

  • Page 57

    Cm oven service manual lit. No. 94-30-006b page 55 door latch assembly refer to page 26 to access the door latch assem- bly. To test the door latch assembly compo- nents, perform the following steps. 1. Turn off the electrical power to the oven. 2. Set the ohmmeter to the r x 1 scale. Testing the la...

  • Page 58

    Cm oven service manual lit. No. 94-30-006b page 56 door switch refer to page 25 to access the door switch. To test the switch, perform the following steps. 1. Turn off the electrical power to the oven. 2. Set the ohmmeter to the r x 1 scale. 3. Disconnect one of the wires from the door switch. 4. To...

  • Page 59

    Cm oven service manual lit. No. 94-30-006b page 57 broil element refer to page 30 to access the broil element. To test the element, perform the following steps. 1. Turn off the electrical power to the oven. 2. Set the ohmmeter to the r x 1 scale. 3. Disconnect one of the wires from the broil element...

  • Page 60

    Cm oven service manual lit. No. 94-30-006b page 58 convection element refer to page 34 to access the convection ele- ment. To test the element, perform the follow- ing steps. 1. Turn off the electrical power to the oven. 2. Set the ohmmeter to the r x 1 scale. 3. Disconnect one of the wires from the...

  • Page 61

    Cm oven service manual lit. No. 94-30-006b page 59 meat probe jack refer to page 37 to access the meat probe jack. To test the jack, perform the following steps. 1. Set the ohmmeter to the r x 1 scale. 2. Disconnect one of the wires from the meat probe jack. 3. Touch the test leads to the meat probe...

  • Page 62

    Cm oven service manual lit. No. 94-30-006b page 60 microwave pcb control refer to page 12 to access the microwave pcb control. The control has a relay (k1), two head- ers (p1 & p3), and two 1/4˝ wire terminals (p2-1 & p2-2). These components perform the following functions: relay k1: transfers 120-v...

  • Page 63

    Cm oven service manual lit. No. 94-30-006b page 61 microwave components despcription switches fuse diode (high voltage) capacitor (high voltage) transformer (high voltage) magnetron tube microwave pcb control stirrer motor microwave cooling fan 1 2 3 4 5 6 7 8 9 1 3 5 4 2 6 7 8 9.

  • Page 64: The  Interlock  Switches

    Cm oven service manual lit. No. 94-30-006b page 62 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 swi...

  • Page 65: Oven Mounted Switches

    Cm oven service manual lit. No. 94-30-006b page 63 oven mounted switches the monitor switch is mounted on the left side of the bracket. It is normally closed. The switch is opened by the forward motion of the hook (see figure a) when the door is closed. The purpose of this switch is to cause the fus...

  • Page 66: Switches Activated By Hook

    Cm oven service manual lit. No. 94-30-006b page 64 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). ➝ ➝ door hook switches switches activated by hook.

  • Page 67: Microwave Fuse Failure:

    Cm oven service manual lit. No. 94-30-006b page 65 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. Th...

  • Page 68: Diode

    Cm oven service manual lit. No. 94-30-006b page 66 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. H...

  • Page 69: Stirrer Motor

    Cm oven service manual lit. No. 94-30-006b page 67 stirrer motor the stirrer motor is a 120 volt ac motor. The purpose of the stirrer motor is to run the stirrer blades at the output of the wave guide. The stirrer rotates at about 60 rpm. As the microwave energy enters the oven cavity through the wa...

  • Page 70: “Cm” Lower Oven

    Cm oven service manual lit. No. 94-30-006b page 68 “cm” lower oven.

  • Page 71: “Cm” Relay Board Matrix

    Cm oven service manual lit. No. 94-30-006b page 69 “cm” relay board matrix replay function k0 upper oven latch motor k1 lower oven latch motor k2 none k3 none k4 upper oven cooling motor k5 lower oven cooling motor k6 upper oven halogen lamp k7 lower oven halogen lamp k8 upper oven bake element k9 u...

  • Page 72: “Cm” Dac Relay Board

    Cm oven service manual lit. No. 94-30-006b page 70 “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 ...

  • Page 73: Dac Relay Board

    Cm oven service manual lit. No. 94-30-006b page 71 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. The pin numbers are identified on the schematic....

  • Page 74: Dac Relay Board

    Cm oven service manual lit. No. 94-30-006b page 72 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 ...

  • Page 75: Dac Relay Board

    Cm oven service manual lit. No. 94-30-006b page 73 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 follow...

  • Page 76: Explanation of The

    Cm oven service manual lit. No. 94-30-006b page 74 explanation of the wire harness the wire harness’ slide onto the pin headers of the relay board, display head, and touch control boards. The illustration above shows the pin headers on the relay board. The wire harness is shown in the illustration a...

  • Page 77: Wire Harnesses

    Cm oven service manual lit. No. 94-30-006b page 75 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 comp...

  • Page 78: Troubleshooting Chart

    Cm oven service manual lit. No. 94-30-006b page 76 troubleshooting chart for relay board header pin failures wire harness off at pin header; or circuits open: p2 lower oven sensor: control functions normal. When sensor opens, f-61 code will appear. If sensor shorts, f-60 will appear. Cooling fan is ...

  • Page 79

    Cm oven service manual lit. No. 94-30-006b page 77 p18 relay board transformer: no fail code, no display at all. Board is dead. P1 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 cooli...

  • Page 80: “Cm” Oven Control Panel

    Cm oven service manual lit. No. 94-30-006b page 78 “cm” oven control panel • touch control glass • touch control boards • display head microwave probe convection bake upper lower cooksmart self clean broil roast upper 1-2-3-4 off pause proof stop cook lower resume dehydrate time time off light panel...

  • Page 81: Electronic Oven Controls

    Cm oven service manual lit. No. 94-30-006b page 79 electronic oven controls handling the boards the touch control board and the display head are subject to failure if static electricity is transferred to the components during han- dling. When handling these parts, use a ground- ing strap, if availab...

  • Page 82: Control Panel Assembly

    Cm oven service manual lit. No. 94-30-006b page 80 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...

  • Page 83: Glass Touch Panel

    Cm oven service manual lit. No. 94-30-006b page 81 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. The large touch control ...

  • Page 84: Display Head

    Cm oven service manual lit. No. 94-30-006b page 82 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). P2 pin header has 2 pins and connects...

  • Page 85: Troubleshooting Chart

    Cm oven service manual lit. No. 94-30-006b page 83 troubleshooting chart for display head pin header failures wire harness off at pin header or open circuits p10 accepts display signals from relay board: glass control panel is completely dead. No display, circuit must be reset. P11 accepts communica...

  • Page 86: Cm Lower Oven

    Cm oven service manual lit. No. 94-30-006b page 84 hidden bake element under oven liner white wires bracket screws back of liner broil element 2 top front mounting screws broil element brackets access panel cover hex nut meat probe jack cm lower oven.

  • Page 87: (Lower Ovens Only)

    Cm oven service manual lit. No. 94-30-006b page 85 removing the hidden bake element (lower ovens only) warning turn off the electrical power circuit to the oven at the main junction box be- fore servicing this unit. When you work on the oven, be careful when handling the sheet metal parts. There are...

  • Page 88: (Lower Ovens Only)

    Cm oven service manual lit. No. 94-30-006b page 86 remove screws rear panel remove screws flange flange remove 6 screws remove 3 screws support bracket bake element wires wire tie figure b figurea bend flange down bend flange down flange figure c hidden element cover hidden bake element screw (1 of ...

  • Page 89: Warning

    Cm oven service manual lit. No. 94-30-006b page 87 removing the oven temperature sensor refer to illustration, below, for the following steps. 1. Turn off the electrical power to the oven. 2. To make servicing easier, remove the oven door (see page 99). 3. Remove the racks from the oven. Inline spli...

  • Page 90: Warning

    Cm oven service manual lit. No. 94-30-006b page 88 removing the convection bake element refer to illustration, below, for the following steps. 1. Turn off the electrical power to the oven. 2. To make servicing easier, remove the oven door (see page 99). 3. Remove the racks from the oven. 4. Remove t...

  • Page 91: Warning

    Cm oven service manual lit. No. 94-30-006b page 89 removing a convection fan motor refer to illustration for the following steps. 1. Turn off the electrical power to the oven. 2. To make servicing easier, remove the oven door (see page 99). 3. Remove the racks from the oven. 4. Remove the front scre...

  • Page 92

    Cm oven service manual lit. No. 94-30-006b page 90 oven liner fan motor white wire (#44) fan motor screws pan e-ring flat washer hex nut (left-rotating thread) bracket with insulation convection blade brown wire (#45) top screw top screw bottom screws convection baffle.

  • Page 93: Warning

    Cm oven service manual lit. No. 94-30-006b page 91 removing a halogen lamp holder refer to illustration, right, for the following steps. 1. Turn off the electrical power to the oven. 2. Remove the oven racks. 3. Remove the oven rack support for the halogen lamp holder you are removing. Caution: make...

  • Page 94: Warning

    Cm oven service manual lit. No. 94-30-006b page 92 removing the lamp transformer & lower oven double line break relay 1. Turn off the electrical power to the oven. 2. Open the upper oven door. 3. Remove the control panel and display head (see page 11 for the procedure). 4. Remove the front subpanel ...

  • Page 95: Warning

    Cm oven service manual lit. No. 94-30-006b page 93 removing the oven light switch, the oven door latch assembly and the hi-temp cutout in lower oven refer to illustration on page 94 for the follow- ing steps. 1. Turn off the electrical power to the oven. 2. Open the oven door for the component you w...

  • Page 96: Tech

    Cm oven service manual lit. No. 94-30-006b page 94 normally open (gold) contacts door open = switch open normally closed door open = switch closed oven door latch lower oven wht (51& 52) upper oven wht (01& 02) lower oven wht (52 & 53) upper oven wht (02 & 03) lower oven wht (56) upper oven wht (06)...

  • Page 97: Removing The Air Switches

    Cm oven service manual lit. No. 94-30-006b page 95 removing the air switches warning turn off the electrical power circuit to the oven at the main junction box before ser- vicing this unit. When you work on the oven, be careful when handling the sheet metal parts. There are sharp edges present and y...

  • Page 98: Removing The Air Switches

    Cm oven service manual lit. No. 94-30-006b page 96 side view bottom trim screw mounting screws air switch mounting screws bracket bottom trim mounting screws air switch bracket upper oven air switch lower oven air switch flange inset 1 inset 2 inset 3 removing the air switches.

  • Page 99: Removing A Blower

    Cm oven service manual lit. No. 94-30-006b page 97 removing a blower 1. Turn off the electrical power to the oven. 2. To make servicing easier, remove the oven door (see page 99). 3. To remove the upper blower (see figure a, page 5-98): a) remove the oven from the wall. B) remove the screws from the...

  • Page 100: Upper Blower

    Cm oven service manual lit. No. 94-30-006b page 98 white (98) white (24) lt. Blue (97) dk. Blue (23) upper blower mounting bracket screw screw screw back of plenum blower wire (24) to upper blower motor blower bracket blower wire (23) to upper blower motor 1 2 3 4 5 6 7 upper blower lower blower fig...

  • Page 101: Removing An Oven Door

    Cm oven service manual lit. No. 94-30-006b page 99 removing an oven door refer to the illustration below for the follow- ing steps. 1. Open the door to its fully open position. 2. Raise the hinge latch over the hook on each of the hinges. Position up to remove door position down to close door 3. To ...

  • Page 102: Caution

    Cm oven service manual lit. No. 94-30-006b page 100 removing the oven door gasket refer to illustration, below, for the following steps. 1. Open the oven door to its fully open po- sition. 2. Pull the ends of the old gasket out of the holes in the door (see inset 1 on the illus- tration). 3. Working...

  • Page 103: Caution

    Cm oven service manual lit. No. 94-30-006b page 101 removing the oven door components 1. To remove any of the oven door compo- nents, remove the oven door from the oven (see page 99). 2. Refer to illustration, below, as you remove the door components. The illustration shows the order of removal. Whe...

  • Page 104: Removing The Oven Module

    Cm oven service manual lit. No. 94-30-006b page 102 removing the oven module (30") convection kit—#35-00-687 warning turn off the electrical power circuit to the oven at the main junction box before ser- vicing this unit. When you work on the oven, be careful when handling the sheet metal parts. The...

  • Page 105: Troubleshooting

    Cm oven service manual lit. No. 94-30-006b page 103 troubleshooting testing the components the air switch refer to page 95 to access the air switch. 1. With no power applied, remove the wire connectors from the terminals. 2. Set the ohmmeter to the r x 1 scale. 3. Connect one of the ohmmeter leads t...

  • Page 106

    Cm oven service manual lit. No. 94-30-006b page 104 the lamp transformer refer to page 92 to access the lamp transformer. 1. With no power applied, remove the wires from the terminals of the lamp transformer. 2. Set the ohmmeter to the r x 1 scale. 3. Touch the ohmmeter leads to the primary terminal...

  • Page 107: The Oven Door Latch

    Cm oven service manual lit. No. 94-30-006b page 105 the oven door latch 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 93 to access the oven door latch assembly. To test on...

  • Page 108: The Broil Element

    Cm oven service manual lit. No. 94-30-006b page 106 the broil element refer to page 30 to access the broil element. 1. With no power applied, remove the wires from the terminals of the broil element. 2. Set the ohmmeter to the r x 1 scale. 3. Touch the ohmmeter leads to the broil ele- ment terminals...

  • Page 109: The Hi-Temp Cutout

    Cm oven service manual lit. No. 94-30-006b page 107 the hi-temp cutout the hi-temp cutout contacts open at or above 350˚f ± 8˚, and are manually reset by pressing the reset button. Refer to page 93 to access the hi-temp cutout. 1. With no power applied, remove the wires from the terminals of the hi-...

  • Page 110: Fault Codes

    Cm oven service manual lit. No. 94-30-006b page 108 fault codes code fault detection f10 power board incompatibility f11 communication error with power board f12 vcc lift-off (power board) f13 power board not calibrated f14 display board eeprom error f19 misc. Power board error f20 upper oven cancel...

  • Page 111

    Cm oven service manual lit. No. 94-30-006b page 113 cm301 electronic oven control wiring (4) wh 01-03 (2) wh blank displa y pcb mw t riac bd. P o w er in door & latch switch oven temp sensor rd-15/16 rd-14/15 or-29 yl-27 yl-85 b u-23 rd-17 (3) wh (7) b u bk-11 rd-91 br-25 (9) or or-09/10 displa y pc...

  • Page 112

    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