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Thermador CM301B Service Manual Download Page 77

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 components (relay
board, display head, touch control board). These 5 wire harness’ are
identified as follows:

Wire Harnesses

(Continued)

2 Wire White Power Harness:

This wire harness has 2 wires and connects
from pin header P8 on the display head to pin
header P2 1 on the left touch control board.
The center hole of the connector is plugged so
it cannot be mis-wired. This harness sends 24
volts AC. To the touch control boards.

7 Wire White Bridge Harness:

This 7 wire harness connects from pin header
P2 on the left side TCB to pin header P2 on the
right side tcb. The #2 hole on the connector
housing is plugged (there is no wire). This
harness sends commands between the left tcb
and the right tcb.

8 Wire Yellow Display Harness:

This 8 wire yellow harness connects from pin
header P10 on the display head to pin header
P10 on the relay board (right rear corner of
relay board). This harness sends display sig-
nals from the relay board back to the display
head.

9 Wire Orange Communication Harness:

This 9 wire harness connects from pin header
P11 on the display head to pin header P11 on
the relay board (right front comer of board).
This harness sends communication signals
from the display head to the relay board.

18 Pin White Communication Harness:

This split wire harness has 18 wires and con-
nects from pin header P1 on the large left side
tcb to pin header P1 on the display head. The
side with the single connector goes to the dis-
play head; the side with the split (2) connector
housings goes to the left side TCB. This harness
sends communication from both the left and
right TCBs to the display head.

Summary of Contents for 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: ...51 High Voltage Capacitor High Voltage Transformer 52 Magnetron Magnetron Thermal Cutout TCO 53 Magnetron Fan Motor Crossflow Blower Motor 54 Door Latch Assembly Monitor Secondary Switches 55 Door Sw...

Page 3: ...THE THERMADOR BUILT IN OVEN MODELS CM301B CM301W CM301S CM302B CM302W CM302S THIS MANUAL IS DESIGNED TO BE USED ONLY BY QUALIFIED SERVICE PER SONNEL THERMADOR RECOMMENDS THAT CUSTOMERS DO NOT SERVICE...

Page 4: ...AIRS MADE ON OUR PRODUCTS BY ANYONE OTHER THAN AUTHORIZED THERMADOR SERVICE TECHNICIANS This symbol alerts you to check for micro wave radiation leakage and to record the readingontheservicerepairtick...

Page 5: ...defective or misadjusted components in the interlock monitor door seal and micro wave generating and transmission systems shall be repaired replaced or adjusted by procedures described in this manual...

Page 6: ...eginning repair work 2 Discharge the electric charge in the high voltage capacitor For about 30 seconds after the oven stops an electric charge remains in the high voltage capacitor When replacing or...

Page 7: ...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...

Page 8: ...ion Leakage monitor should initially be set to the highest scale To prevent false readings hold the test probe by the grip portion of the handle only and move it along the shaded area shown in the fol...

Page 9: ...etron 5 Measuring A Fully Assembled Oven After all components including the top panel are fully assembled measure for radiation leakage around the door periphery and the door viewing window 6 Record k...

Page 10: ...1 800 735 4328 Length of Warranty FULL ONE YEAR For one year from date of instal lation or date of occupancy for a new previously unoccupied dwelling Save all dated receipts or other evidence of date...

Page 11: ...OMPONENTS Control Panel Door Switch Monitor Secondary Switch Assembly Door Latch Assembly High Temp Cutout Stirrer Blade Broil Element Oven Thermal Sensor Halogen Light 2 Convection Element Convection...

Page 12: ...he 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 careful 3 To remove the trim rem...

Page 13: ...om the oven see Page 10 4 Remove the four screws from the control panel mounting bracket pull the catches out of the ball studs at each end of the bracket see the small inset and remove the bracket fr...

Page 14: ...t of its mounting location so that you can access the trim and ple num covers 3 Remove the trim and top plenum covers from the oven see Page 10 4 Remove the control panel mounting bracket see Step 4 o...

Page 15: ...oven 2 Pull the oven out of its mounting location so that you can access the trim and ple num covers 3 Remove the trim and top plenum covers from the oven see Page 10 4 To remove the light transforme...

Page 16: ...l 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 3 Remove the trim and top plenum covers from the oven see Page 10 4 Disconnect...

Page 17: ...nd ple num covers 3 Remove the trim and top plenum covers from the oven see Page 10 4 To remove the transformer cooling fan a Disconnect the wires from the termi nals b Remove the two plenum mounting...

Page 18: ...l 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 3 Remove the trim and top plenum covers from the ove...

Page 19: ...rself if you are not careful 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 3 Remove the trim and top...

Page 20: ...or from the transformer side shield 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 3 Remove the trim...

Page 21: ...ng to the oven 2 Pull the oven out of its mounting location so that you can access the trim and ple num covers 3 Remove the trim and top plenum covers from the oven see Page 10 4 CAUTION DISCHARGE THE...

Page 22: ...you can access the trim and ple num covers 3 Remove the trim and top plenum covers from the oven see Page 10 4 CAUTION DISCHARGE THE HIGH VOLTAGE MICROWAVE CAPACITOR WITH A 20 000 OHM 1 OR 2 WATT RES...

Page 23: ...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 paste over the top of the new transformer then pl...

Page 24: ...n out of its mounting location so that you can access the trim and ple num covers 3 Remove the trim and top plenum covers from the oven see Page 10 4 CAUTION DISCHARGE THE HIGH VOLTAGE MICROWAVE CAPAC...

Page 25: ...of the magnetron should be perfectly paral lel with the waveguide to operate prop erly e Remove the four mounting screws from the magnetron and lift it off the waveguide d Remove the two pieces of in...

Page 26: ...he plate off the control panel b Pull the top of the control panel for ward and unhook the two ball studs at the top right and left corners from the catches c Disconnect the five cables from the con t...

Page 27: ...not careful 1 Turn off the electrical power going to the oven 2 Open the microwave oven door 3 Remove the four outer black screws from the bottom of the control panel assembly see Step 3 Page 24 4 Re...

Page 28: ...d P11 and remove the control panel assembly NOTE The door latch assembly and the moni tor and secondary switch assembly must each be replaced as an assembly Individual parts are not available 8 To rem...

Page 29: ...ow b Disconnect the wires from the termi nals 10 To remove the monitor and secondary switch assembly a Use an angled screwdriver and remove the four screws and lockwashers from the switch assembly Pul...

Page 30: ...ws from the rack support that is over the halogen light you wish to service CAUTION When you remove the halogen lens holder and lens in the next step be care ful that the lens does not fall out and br...

Page 31: ...er cutout for the halogen light and press the assembly into place so its edges are flush with the outside of the liner 2 Install the bulb in the socket 3 When you reinstall the metal screen do not ins...

Page 32: ...the oven racks 4 To remove the broil element a Remove the two front and six rear screws from the broil element 5 To remove the stirrer blade assembly a If not already done remove the broil element ref...

Page 33: ...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 Stir...

Page 34: ...racks 4 If not already done remove the broil ele ment refer to Step 4 on Page 30 and the stirrer blade assembly refer to Step 5 on Page 30 5 Remove the two screws from the waveguide insulator and remo...

Page 35: ...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 waveguide is installed IMPORTANT Make sure that...

Page 36: ...ement a Remove the eight screws from the con vection element b Pull the element forward until the ter minal wires are inside the oven the el ement terminals and wires are angled up 90 Disconnect the t...

Page 37: ...nd tested for microwave emissions at the factory DO NOT RE MOVE THIS SHIELD COVER Nut Convection Fan Blade Screw 1 of 15 Rear Shield Cover Plate Continued on the next page Spacer 1 of 4 Bottom Motor M...

Page 38: ...on 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 blade is rea...

Page 39: ...6 socket and re move the hex nut 5 Remove the screw from the meat probe jack access panel on the right side of the oven 6 Remove the piece of insulation that is cov ering the meat probe jack 7 Pull th...

Page 40: ...ven out of its mounting location so that you can access the trim and ple num covers 3 Remove the trim and top plenum covers from the oven see Page 10 4 Remove the back cover from the oven 5 Remove the...

Page 41: ...t ing and element brackets 2 each 10 Remove the plastic grommet from the blower mounting plate hole and remove the grommet from the wiring 11 Bend the blower mounting plate down 90 along the perforate...

Page 42: ...reful 1 Turn off the electrical power going to the oven 2 Open the microwave oven door 3 Remove the oven racks 4 Remove the two screws from the oven thermal sensor 6 Using the instructions in the Ther...

Page 43: ...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 insert the ends of the gasket into the liner hole Fully insert one end at a time...

Page 44: ...TION Be careful handling the oven door when removing it as it is very heavy Never lift the door by the handle 1 Pull the oven out of its mounting location so that you can access the left and right hin...

Page 45: ...top and carefully close it until the hook in the hinge contacts the hinge support approximately 3 4 of the way You will feel some spring resistance while you do this which is normal 7 Gently lean aga...

Page 46: ...nstall the two hinge locking screws Rotate U Clip Forward To Unlock After reinstalling the oven door check around the door for microwave radiation leakage Service Alert Make sure that the door seal is...

Page 47: ...from the unit see Page 42 and lay it on a padded surface with the glass side down and the bottom edge facing you 2 Remove the two bottom edge screws and the two top screws from the liner This will se...

Page 48: ...padded work surface NOTE Set the oven door glass assembly out of the way so it does not get damaged 4 To remove an oven door hinge a Remove the mounting screw at the bot tom edge of the door b Slide...

Page 49: ...inner glass is not heat treated like the center glass Be sure to install the untreated glass in the in ner glass position 7 To remove the RF screen and the inner glass a Remove the bottom insulation...

Page 50: ...lass is heat treated use an ohmmeter to check it To do this set the ohmmeter to the R X 1 scale and touch the test probes to the glass If the glass is heat treated the meter will indicate a short 0 If...

Page 51: ...dicate a short circuit 0 If the fuse is open the meter will indicate an open circuit infinite resistance TO AVOID ELECTRICAL SHOCK DISCONNECT THE POWER TO THE APPLIANCE BEFORE TESTING Refer to Page 15...

Page 52: ...d indi cate less than 1 at each location a Terminals 8 and 6 b Terminals 8 10 c Terminals 6 and 10 LIGHT TRANSFORMER Refer to Page 13 to access the double line break relay To test the double line brea...

Page 53: ...age diode 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 wires from the diode IMPORTANT Use the above photo for the prop...

Page 54: ...tage transformer To test the high voltage trans former 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 Primary Winding 3 Disco...

Page 55: ...AGNETRON THERMAL CUTOUT TCO Refer to Page 27 to access the magnetron ther mal cutout TCO To test the TCO perform the following steps 1 Turn off the electrical power to the oven 2 Set the ohmmeter to t...

Page 56: ...the mag netron fan motor terminals 4 Touch the test leads to the motor termi nals The meter should indicate less than 1 CROSSFLOW BLOWER MOTOR RefertoPage17toaccessthecrossflowblower To test the moto...

Page 57: ...tor Terminals MONITOR SECONDARY SWITCHES Door Unlock Switch N O Terminals Latch Interlock Switch N O Terminals Refer to Page 27 to access the monitor and secondary switches To test the switches per fo...

Page 58: ...cate an open circuit infinite resistance 5 Press the switch button to close the con tacts The meter should indicate a short circuit 0 OVEN THERMAL SENSOR Refer to Page 40 to access the oven thermal se...

Page 59: ...the broil element 4 Touch the test leads to the broil element terminals The meter should indicate be tween 13 and 20 BAKE ELEMENT Refer to Page 38 to access the bake element To test the element perfor...

Page 60: ...n vection element 4 Touch the test leads to the convection elementterminals Themetershouldindi cate between 15 and 25 CONVECTION MOTOR Refer to Page 36 to access the convection mo tor To test the moto...

Page 61: ...e jack The metershouldindicateashortcircuit 0 Refer to Page 15 to access the M W trans former air switch To test the switch perform the following steps 1 Turn off the electrical power to the oven 2 Di...

Page 62: ...18 volts DC activates the relay coil and the 6 volts DC activates the triac on the Microwave PCB Control Terminal P2 1 Inputs 120 volts AC from the latch interlock switches Terminal P2 2 Outputs 120 v...

Page 63: ...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...

Page 64: ...ose properly or the primary switches fails These switches are not adjustable They must be replaced if they fail Latch mounted switch The primary latch interlock switch is mounted on the microwave oven...

Page 65: ...ime The right side door interlock switch secondary is mounted on the right side of the oven bracket It is normally open The switch is closed by side ways motion of the hook See Figure A when the oven...

Page 66: ...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 Swi...

Page 67: ...and an explanation of the fuse protection system The safety switches are the monitor switch and the latch interlock switch primary switch and the right side door interlock switch secondary switch The...

Page 68: ...tely 1 second before the high voltage circuit is energized MAGNETRON TUBE The magnetron tube is a vacuum tube in which the flow of electrons from the heated cathode to the anode is controlled by a mag...

Page 69: ...Board using a wire har ness from PIN Header P6 on the relay board P3 Pin Header Pins 1 and 2 inputs 12 Volts AC from the halogen light transformer circuit Pins 3 and 4 output 12 volts DC Rectified th...

Page 70: ...CM Oven Service Manual Lit No 94 30 006B Page 68 CM Lower Oven...

Page 71: ...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 Upper Oven Broil Element K10 Upper Oven Convection Element...

Page 72: ...Transfers 120 volts from L2 to both oven cooling motors tube fan m w TX and cooling fan K6 Transfers current to complete L2 v a c Upper oven halogen light circuit K7 Transfers current to complete L2...

Page 73: ...harness so it cannot be miswired P5 Sends current to the lower oven latch switches It is a 5 pin header Only 1 2 3 and 5 are used 4 is missing on the pin header and is plugged on the harness to preven...

Page 74: ...oor latch P0 3 Blank P0 4 Sends 120VAC to lower oven latch motor P0 5 Blank P0 6 Sends 120 VAC to microwave stirrer motor P0 7 Not used P0 8 Blank P1 large pin header has 8 pins and are identified as...

Page 75: ...upper oven convection motor P8 large pin header has 4 pins and are identified as follows P8 1 Current from L2 to K15 relay P8 2 Current to lower oven convection motor P8 3 Blank P8 4 Blank P18 large p...

Page 76: ...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...

Page 77: ...ide tcb The 2 hole on the connector housing is plugged there is no wire This harness sends commands between the left tcb and the right tcb 8 Wire Yellow Display Harness This 8 wire yellow harness conn...

Page 78: ...t all modes except self clean When set in self clean DOR will flash and self clean will erase P9 Upper oven door latch Will accept all modes except self clean When set in self clean dor will flash and...

Page 79: ...s will close but the lights and motors will not work P8 Lower oven convection motor No fail code The lower oven convection motor will not work The relay will snap closed P7 Upper oven convection motor...

Page 80: ...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 LOCK CLOCK TIMER 1 TIMER OFF...

Page 81: ...in antistatic bags When removing the boards from their bags handle them as follows Touch Control Board Handle the Touch Control Board only by the edges of the glass and the plastic frame DO NOTTOUCHt...

Page 82: ...me size The difference between a 27 inch oven and a 30 inch oven is deter mined by the control panel Mounting brackets There are 6 mounting brackets that hold the glass against the control panel snug...

Page 83: ...has 8 pins only 7 are used 2 is missing and connects to the small right side touch control board P3 pin header on the large left side touch control board is not used Right side touch control board The...

Page 84: ...ns and connects to the meat probe P4 pin header has 2 pins and connects to the lower oven air switch P6 pin header has 2 pins and connects to the upper oven air switch and the microwave transformer ai...

Page 85: ...per oven air switch F 34 will appear if upper oven air switch does not close If air switch does not close the mode is cancelled after about 45 seconds P4 Lower oven air switch F64 will appear if lower...

Page 86: ...it 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...

Page 87: ...t so you can access the flange at the bottom of the oven 6 Remove the six screws from the flange 7 Remove the two wires from the bake ele ment 8 Refer to Figure C Page 86 and bend the bottom flange do...

Page 88: ...ws 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...

Page 89: ...edges present and you can cut yourself if you are not careful CAUTION 4 Remove the screws from the bracket and pull the oven temperature sensor forward until the wire connectors are through the openi...

Page 90: ...crews from the convection bake element bracket and the screw from the bottom support and pull the element forward then disconnect the wires from the terminals 7 Install the new convection bake element...

Page 91: ...he 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...

Page 92: ...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 Bo...

Page 93: ...you pry the lamp holder out of the cutout 6 Cut the plug off the new lamp holder 7 Connect the cut wires to the new lamp holder with two red inline splices After you connect the wires pull on them to...

Page 94: ...ndary Winding 10 6 1 5 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...

Page 95: ...the latch assembly to the right so that the flange on the left side clears the bracket and then pull it forward as far as the wires will allow c Remove the wires from the switch con nectors and the m...

Page 96: ...Oven Motor 07 08 Com Com N O N O Unlock Switch Latch Interlock Switch SCREWS OVEN DOOR LATCH SCREWS UPPER AIR VENT GRILLE AIR VENT GRILLE AIR VENT GRILLE SCREWS Hex Head Screw Hex Head Screw Bracket S...

Page 97: ...tration on Page 96 for the follow ing steps 1 Turn off the electrical power to the oven 2 Open the lower oven door The bottom trim mounting screws see Inset 1 Page 96 are visible at each side of the o...

Page 98: ...6B 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 Inse...

Page 99: ...ssembly to the plenum 4 To remove the lower blower see Figure B Page 5 98 a Remove the oven from the wall b Remove the rear panel from the oven c Remove the four bracket screws 1 2 6 7 from the back o...

Page 100: ...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 Upp...

Page 101: ...on each of the hinges Position Up To Remove Door Position Down To Close Door 3 To remove the door a Grasp the door by the sides toward the back and raise the front of the door sev eral inches there wi...

Page 102: ...t it is locked into place 6 Using the eraser end of a pencil push the ends of the gasket fully into the holes in the oven door 7 Check the entire gasket to make sure that all of the clips are properly...

Page 103: ...elow as you remove the door components The illustration shows the order of removal When you work on the oven be careful when handling the sheet metal parts There are sharp edges present and you can cu...

Page 104: ...ts from the oven shown in illustration below Refer to the sections in this manual for the procedures on removing the components 5 With all of the oven components removed remove the six screws three on...

Page 105: ...switch in its normal position and continuity when it is activated 5 If the readings are not correct remove and replace the switch WARNING Motor Terminals BLOWER ASSEMBLY TO AVOID ELECTRICAL SHOCK DISC...

Page 106: ...ads to the secondary terminals The meter should indicate 2 5 If the readings are not correct remove and replace the lamp transformer Primary Winding Secondary Winding 10 6 1 5 THE CONVECTION FAN MOTOR...

Page 107: ...ch terminal The meter should indicate no continuity with the switch in its normal position and continuity when it is activated OVEN DOOR LATCH Motor Terminals Com Com N O N O Lock Switch Unlock Switch...

Page 108: ...broil ele mentterminals Themetershouldindicate15 4 If the reading is not correct remove and replace the broil element THE HIDDEN BAKE ELEMENT RefertoPages85and86toaccessthebakeelement 1 With no power...

Page 109: ...r leads to the terminals The meter should indicate continuity 4 If the reading is not correct remove and re place the hi temp cutout Terminals Hi Temp Cutout Reset Button THE CONVECTION BAKE ELEMENT R...

Page 110: ...32 Upper oven over temperature while cleaning F33 Upper oven over temperature while cooking F34 Upper oven cooling fan not operating F40 Upper meat probe shorted F50 Upper door signal shorted low F51...

Page 111: ...WH 7 BU BK 11 RD 91 BR 25 9 OR OR 09 10 Display PCB DBL Line Break Relay RD 73 YL 18 CM302 ELECTRONIC OVEN CONTROL WIRING RD 69 RD 92 9 OR BR 76 OR 59 60 OR 09 10 RD 91 BR 25 4 WH 01 03 4 WH 51 55 2 W...

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...

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