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Section 3 Troubleshooting and Testing

3-11

Procedure

Letter

M

Component Test

KEY UNIT (FPC) TEST

1.   Disconnect the power supply cord, and then remove outer case.
2.   Open the door and block it open.
3.   Discharge high voltage capacitor. (See Warnings and Instructions on page 3-1)
4.   Remove the control panel assembly

5. If the display fails to clear when the CLEAR-OFF pad is depressed, first verify the flat ribbon

cable is making good contact, verify that the door sensing switch (stop switch) operates
properly; that is the contacts are closed when the door is closed and open when the door is
open. If the door sensing switch (stop switch) is good, disconnect the flat ribbon cable that
connects the key unit to the control unit and make sure the door sensing switch is closed
(either close the door or short the door sensing switch connector). Use the Key unit matrix
indicated on the control panel schematic and place a jumper wire between the pins that
correspond to the CLEAR-OFF pad making momentary contact. If the control unit responds by
clearing with a beep the key unit is faulty and must be replaced. If the control unit does not
respond, it is faulty and must be replaced. If a specific pad does not respond, the above
method may be used (after clearing the control unit) to determine if the control unit or key pad
is at fault.

6.   Reconnect all leads removed from components during testing.
7.   Re-install the control panel assembly.
8.   Reconnect the power supply cord.
9.   Run the oven and check all functions.

G2

G1

G4

G 5

KE Y UNIT

C ook

R eheat

Defrost

P ower

Level

TIME R

C LOC K

P opcorn

Light

Fan

1

2

4

5

3

8

6

9

0

7

G 6

G 7

G 8

G 9

G 10

G 11

G 12

G3

C lear

Off

S TAR T

P lus 1 Min

G1

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Содержание CFMV152KW

Страница 1: ...t Servicing OVER THE RANGE MICROWAVE OVENS With Standard And Electronic Controls Publication 5995542437 Part 316439277 June 2009 Electrolux Major Appliances North America 250 Bobby Jones Expwy Augusta GA 30907 ...

Страница 2: ......

Страница 3: ... operation of any safety device 5 Use ONLY REPLACEMENT PARTS CATALOGED FOR THIS APPLIANCE Substitutions may defeat compliance with Safety Standards Set For Home Appliances 6 GROUNDING The standard color coding for safety ground wires is GREEN or GREEN with YELLOW STRIPES Ground leads are not to be used as current carrying conductors It is EXTREMELY important that the service technician reestablish...

Страница 4: ...hanism 2 4 Door Sensing And Secondary Interlock Switch 2 4 Monitor Switch 2 5 Thermal Cut Out Cavity 2 5 Thermal Cut Out Hood 2 5 Turntable Motor 2 5 Cooling Fan Motor 2 5 Hood Fan Motor 2 5 Hood Lamp 2 5 Section 3 Troubleshooting and Testing Warnings and Cautions 3 1 Troubleshooting Guide Chart 3 2 Test Procedures 3 3 Description Of LSI 3 15 Section 4 Component Teardown Warnings and Cautions 4 1 ...

Страница 5: ...osure by themselves or when they are damaged loosened or removed Section 1 Basic Information 1 3 WARNING This service manual is intended for use by persons having electrical and mechanical training and a level of knowledge of these subjects generally considered acceptable in the appliance repair trade Electrolux home products cannot be responsible nor assume any liability for injury or damage of a...

Страница 6: ...emission check as per the Microwave Measurement Procedure outlined in this service manual If microwave emissions level is in excess of the specified limit contact ELECTROLUX HOME PRODUCTS INC immediately If the unit operates with the door open service person should 1 Tell the user not to operate the oven 2 Contact Electrolux HOME PRODUCTS INC and Food and Drug Administration s Center for Devices a...

Страница 7: ...open 3 Discharge high voltage capacitor 4 Reconnect leads to the primary of the inverter unit 5 Reinstall the outer case cabinet 6 Reconnect the power supply cord after the outer case is installed 7 Run the oven and check all functions After repairing 1 Reconnect all leads removed from components during testing 2 Reinstall the outer case cabinet 3 Reconnect the power supply cord after the outer ca...

Страница 8: ...ty The water container shall be a low form of 600 ml 20 oz beaker with an inside diameter of approx 8 5 cm 3 1 2 in and made of an electrically nonconductive material such as glass or plastic The placing of this standard load in the oven is important not only to protect the oven but also to insure that any leakage is measured accurately 4 Set the cooking control on Full Power Cooking Mode 5 Close ...

Страница 9: ...d accurately 4 Set the cooking control on Full Power Cooking Mode 5 Close the door and select a cook cycle of several minutes If the water begins to boil before the survey is completed replace it with 275 ml of cool water C Leakage test with enclosure installed 1 Grasp probe of survey instrument and hold it perpendicular to gap between door and the body of the oven 2 Move the probe slowly not fast...

Страница 10: ...0 12 59 Timer 0 99 min 99 seconds Microwave Power for Variable Cooking Repetition Rate P HI Full power throughout the cooking time P 90 approx 90 of Full Power P 80 approx 80 of Full Power P 70 approx 70 of Full Power P 60 approx 60 of Full Power P 50 approx 50 of Full Power P 40 approx 40 of Full Power P 30 approx 30 of Full Power P 20 approx 20 of Full Power P 10 approx 10 of Full Power P 0 No p...

Страница 11: ...rd and plug must be connected to a separate 120 Volt AC 60 Hz 15 Amp or more dedicated line using a grounded receptacle When installing this appliance observe all applicable codes and ordinances A short power supply cord is provided to reduce risks of becoming entangled in or tripping over a longer cord Where a two pronged wall receptacle is encountered it is the personal responsibility and obliga...

Страница 12: ...es The oven will not operate unless the door is securely closed 7 Auto Touch control panel 8 Time display Digital display 99 minutes 99 seconds 9 Ventilation openings 10 Light Cover 11 Grease filters 12 Removable turntable The turntable will rotate clockwise or counterclockwise Only remove for cleaning 13 Removable turntable support 14 Power supply cord Oven Diagram 10 11 12 8 7 14 6 9 3 4 5 1 9 1...

Страница 13: ...od is placed to be cooked 5 Upon completion of the cooking time the power transformer oven lamp etc are turned off and the generation of microwave energy is stopped The oven will revert to the OFF condition 6 When the door is opened during a cook cycle monitor switch door sensing switch primary interlock switch and secondary interlock relay are activated with the following results The circuits to ...

Страница 14: ... Cooktop Lamp CL OG Orange YW Yellow RD Red BL Blue GN Green BR Brown WH White BK Black GY Grey PK Pink Figure 2 1 Oven Off Condition Figure 2 2 Oven ON Cooking Condition OG Orange YW Yellow RD Red BL Blue GN Green BR Brown WH White BK Black GY Grey PK Pink SCHEMATIC NOTE CONDITION OF OVEN 1 DOOR CLOSED 2 COOKING TIME PROGRAMMED 3 VARIABLE COOKING CONTROL HIGH ...

Страница 15: ...agnetron filament NOTE VENTILATION METHODS HOT AIR EXHAUST 1 Vertical Venting For this venting method hot air rising from the conventional range below is drawn in by the hood fan motor through the grease filters at the right and left sides of the base cover up through the right and left sides of the oven cavity then discharged vertically at rear center top of the oven into the customer s vent syst...

Страница 16: ...ll error because it works on commercial frequency 4 Reset Circuit This circuit generates a signal which resets the LSI IC1 to the initial state when power is supplied 5 Buzzer Circuit The buzzer is responds to signals from the LSI to emit audible sounds key touch sound and completion sound 6 Door Sensing Switch A switch to inform the LSI if the door is open or closed 7 Relay Circuit To drive the m...

Страница 17: ...ing switch secondary interlock relay RY2 relay RY1 primary interlock switch and monitor switch for proper operation Refer to Test Procedure CAUTION Monitor fuse and switch are replaced as an assembly NOTE THERMAL CUT OUT HOOD This thermal cut out located on the right base plate It is designed to automatically turn on the hood fan motor whenever the hot air rising from the conventional range below ...

Страница 18: ...Section 2 Operation 2 6 Notes ...

Страница 19: ...fuse If the monitor fuse is replaced the monitor switch must also be replaced CAUTION Whenever troubleshooting is performed with the power supply cord disconnected It may in some cases be necessary to connect the power supply cord after the outer case has been removed in this event 1 Disconnect the power supply cord and then remove outer case 2 Open the door and block it open 3 To discharge high v...

Страница 20: ...e motor does not operate Oven lamp lights and fan motor operate Oven does not go into cook cycle when START pad is touched Oven seems to be operating but little or no heat is produced in oven load Food incompletely cooked or not cooked at all at end of cook cycle Oven goes into a cook cycle but extremely uneven heating is produced in oven load food Variable cooking does not operate properly except...

Страница 21: ...easuring cup with 16 oz 453 cc of tap water and measure the temperature of the water with a thermometer or thermocouple temperature tester Stir the thermometer or thermocouple through the water until the temperature stabilizes Record the temperature of the water 2 Place the cup of water in the oven Operate oven at 100 POWER selecting more than 60 seconds cook time Allow the water to heat for 60 se...

Страница 22: ... power supply cord and then remove outer case 2 Open the door and block it open 3 Discharge high voltage capacitor See Warnings and Instructions on page 3 1 4 Isolate the rectifier from the circuit Using the highest ohm scale of the meter read the resistance across the terminals and observe reverse the leads to the rectifier terminals and observe meter reading If a short is indicated in both direc...

Страница 23: ...out terminals should indicate a closed circuit unless the temperature of the thermal cut out reaches approximately 230 F 110 C An open thermal cut out indicates overheating of the oven exchange the oven thermal cut out and check inside of oven cavity and for improper setting of cooking time or operation of control unit Check for restricted air flow through the vent holes of the oven cavity especia...

Страница 24: ...nd normally open NO terminal of the switch The meter should indicate an open circuit with the door open and a closed circuit with the door closed If improper operation is indicated replace the door sensing switch 5 Reconnect all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and chec...

Страница 25: ...may be defective After testing the monitor switch reconnect wire lead to monitor switch COM terminal and check continuity of monitor circuit 5 Reconnect all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect the power supply cord after the outer case is installed 8 Run the oven and check all functions HOOD THERMAL CUT OUT TEST 1 Disconnect the power supply ...

Страница 26: ... If 120 Volts appear and the hood capacitor is good replace the hood fan assembly If 120 Volts does not appear check the motor circuit The resistance values of motor terminals are shown below 5 Reconnect all leads removed from components during testing 6 Reinstall the outer case cabinet 7 Reconnect power supply cord after the outer case is installed 8 Run oven and check all functions Resistance be...

Страница 27: ...lated from other components and oven chassis by using insulation tape KEY UNIT 1 Check Key unit ribbon connection before replacement 2 Reconnect all leads removed from components during testing 3 Re install the hood intake duct R with two 2 screws 4 Re install the outer case cabinet 5 Reconnect the power supply cord after the outer case is installed 6 Run the oven and check all functions The follo...

Страница 28: ...ight d The corresponding segments of all digits do not light up or they continue to light up e Wrong figure appears f A certain group of indicators do not light up g The figure of all digits flicker 3 Other possible problems caused by defective control unit a Buzzer does not sound or continues to sound b Clock does not operate properly c Cooking is not possible When testing is completed 1 Disconne...

Страница 29: ...the door sensing switch is closed either close the door or short the door sensing switch connector Use the Key unit matrix indicated on the control panel schematic and place a jumper wire between the pins that correspond to the CLEAR OFF pad making momentary contact If the control unit responds by clearing with a beep the key unit is faulty and must be replaced If the control unit does not respond...

Страница 30: ...trol unit is defective 9 If any abnormal condition is detected replace the control unit 10 Disconnect the power supply cord and then remove outer case 11 Open the door and block it open 12 Discharge high voltage capacitor See Warnings and Instructions on page 3 1 13 Reconnect all leads removed from components during testing 14 Re install the hood intake duct R 15 Re install the outer case cabinet ...

Страница 31: ...connect the power supply cord 9 Open the door and block it open 10 To discharge high voltage capacitor wait for 60 seconds 11 Reconnect all leads removed from components during testing 12 Re install the hood intake duct R 13 Re install the outer case cabinet 14 Reconnect the power supply cord after the outer case is installed 15 Run the oven and check all functions STEPS OCCURRENCE CAUSE OR CORREC...

Страница 32: ...he following table If incorrect readings are obtained replace the noise filter 6 Reconnect all leads removed from components during testing 7 Reinstall the outer case cabinet 8 Reconnect the power supply cord after the outer case is installed 9 Run the oven and check all functions MEASURING POINT INDICATION OF OHMMETER Between N and H Between terminal N and LOAD Short circuit Between terminal L an...

Страница 33: ...odes variable cooking the signal turns to H level and L level in repetition according to the power level Signal coming from touch key When either G 2 line on key matrix is touched a corresponding signal out of P20 P21 P22 P25 and P26 will be input into P46 When no key is touched the signal is held at H level Signal similar to P46 When either G11 line on key matrix is touched a corresponding signal...

Страница 34: ...se signal is input to P43 P46 terminal while one of G1 line keys on key matrix is touched Terminal not used Hood lamp driving signal To turn on and off relay RY5 L level During Hood lamp ON H level During Hood lamp OFF Terminal not used Hood motor driving signal To turn on and off relay RY4 L level During Hood motor ON H level During Hood motor OFF Terminal not used Terminal not used Segment data ...

Страница 35: ...n 2 If the wave guide or oven cavity are not intact 3 If the door is not closed 4 If the outer case cabinet is not fitted WARNING Disconnect oven from power supply before removing outer case Discharge high voltage capacitor before touching any oven components or wiring after removing outer case CAUTION To prevent an electric shock take the following precautions 1 Before wiring A Disconnect the pow...

Страница 36: ...Removal Remove the oven from the wall and proceed as follows 1 Disconnect the power supply cord 2 Open the door and block it open 3 To discharge the high voltage capacitor wait for 60 seconds 4 Remove two 2 screws holding the top stay to the hood fan motor or the oven and remove it 5 Remove the six 6 screws from the rear of the outer case cabinet and two 2 screws at right and five 5 screws at top ...

Страница 37: ...ty reconnect wire leads to the turntable motor and two cooktop lamps Re install the base plate to the cavity with four 4 screws 5 Re install the outer case and check that oven is operating properly Make sure the wire leads never touch the fan blade CAUTION To discharge the high voltage capacitor wait for 60 seconds and then short circuit the connection of the high voltage capacitor that is the con...

Страница 38: ...se of an insulated screwdriver NOTE High Voltage Rectifier And High Voltage Capacitor Removal 1 Disconnect power supply cord remove oven from wall and remove outer case Refer to procedure of Removal of Oven from Wall and Outer Case Removal 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Disconnect the high voltage wire leads with high voltage rectifier from the magnetron 5 D...

Страница 39: ...ead of the high voltage rectifier against the chassis with the use of an insulated screwdriver NOTE Cooling Fan Motor Removal Removal 1 Disconnect the power supply cord remove the Hood Exhaust louver from the cavity Refer to procedure of Removal of Hood Exhaust louver 2 Open the door and block it open 3 Remove the one 1 screw holding the control panel to the oven cavity front plate 4 Up push the c...

Страница 40: ...pen the door and block it open 3 Discharge high voltage capacitor The high voltage transformer of the microwave oven is still live during servicing and presents a hazard CAUTION To discharge the high voltage capacitor wait for 60 seconds and then short circuit the connection of the high voltage capacitor that is the connecting lead of the high voltage rectifier against the chassis with the use of ...

Страница 41: ...elated controls of the touch control panel checking them is possible if dummy resistor s with resistance equal to that of the controls are used B Servicing the touch control panel with power supply from an external power source Disconnect the touch control panel completely from the oven proper and short both ends of the door sensing switch on PWB of the touch control panel which brings about an op...

Страница 42: ... unit to the key fixing plate 14 Release the two 2 tabs holding the power unit to the key fixing plate 15 Release the three 3 tabs holding the LCD to the LCD holder 16 Release the two 2 tabs holding the LSI unit to the LCD holder 17 Remove the LCD holder and the LED sheet 18 Now the control unit is free 19 Remove the one 1 screw holding the key fixing plate to the control panel 20 Release the six ...

Страница 43: ... Refer to procedure of Removal of Oven from Wall and Outer case Removal 2 Open the door and block it open 3 Discharge high voltage capacitor 4 Remove the three 3 screws holding the hood intake duct R to the oven cavity top plate the oven cavity front flange and the fan duct Remove hood intake duct R 5 Remove the control panel assembly referring to the procedure of CONTROL PANEL ASSEMBLY CONTROL UN...

Страница 44: ... holding the hood exhaust louver to the oven cavity front face plate 5 Remove the hood exhaust louver from the oven cavity by pushing the right and left tabs of the hood exhaust louver Refer to the procedure of HOOD EXHAUST LOUVER REMOVAL 6 Insert a putty knife thickness of about 0 5mm into the gap A between the door stopper and the choke cover as shown in Figure 4 5 to free engaging parts 7 Lift ...

Страница 45: ...ower Door Hinge Pin Door Assembly Tab Tab Hood Exhaust Upper Oven Oven Hinge Hinge Re install Re install Door Stopper Lower Latch Heads Louver Door Disassembly Removal 1 Disconnect the power supply cord and remove the oven from wall and remove outer case Refer to procedure of Removal of Oven from Wall and Outer case Removal 2 Open the door and block it open 3 To discharge high voltage capacitor wa...

Страница 46: ...nel 14 Release the latch spring from the tab of the latch head and tab of the door panel 15 Release the latch head from the door panel 16 Now the latch spring latch head and door panel are free A Choke Cover Door Stopper Putty Knife Door Frame Figure 4 5 Door Disassembly ...

Страница 47: ...ON OF OVEN 1 DOOR CLOSED 2 CLOCK APPEARS ON DISPLAY Oven Lamp OL Fan Motor FM Turntable Motor TTM Stirrer Motor SM Cooktop Lamp CL OG Orange YW Yellow RD Red BL Blue GN Green BR Brown WH White BK Black GY Grey PK Pink Wiring Schematic Oven OFF Condition ...

Страница 48: ...21 COOKTOP LAMP WH 12 BK 10 POWER RELAY WH 30 GN 28 YW 29 OG 27 BL 25 VENT MOTOR CAVITY THERMOSTAT BK 2 BK 1 BK 2 BK 3 MGT THERMOSTAT BOTTOM THERMOSTAT BK 4 BK 3 GY 26 BK 24 HOOD THERMOSTATA OG 27 WH 31 YW 32 DOOR SENSING SWITCH YW 7 YW 6 PRIMARY SWITCH BK 4 BK 8 MONITOR SWITCH WH 11 WH 9 YW 29 GN 28 MOTOR CONDENSER BK WH BK WH GND NOISE FILTER BK 1 WH 12 OUT IN BK WH POWER CORD WH 11 BK 10 WH 9 B...

Страница 49: ...ount bracket 4 A B C D E Control Board printed circuit 5 A Door Assembly black 5 B Door Assembly silver 5 C Door Assembly bisque 5 D Door Assembly stainless 5 E Door Assembly white 6 A B D Handle Assembly door black 6 C Handle Assembly door bisque 6 E Handle Assembly door white 7 A Panel outer door black 7 B Panel outer door silver 7 C Panel outer door bisque 7 D Panel outer door stainless 7 E Pan...

Страница 50: ...late mounting rear 29 A Grille Assy exhaust black 29 B Grille Assy exhaust silver 29 C Grille Assy exhaust bisque 29 D Grille Assy exhaust stainless 29 E Grille Assy exhaust white 29A A B C D E Louver vent 30 A B C D E Cover control shield right 31 A B C D E Cover lamp oven cavity 32 A B C D E Hardware Kit installation 33 A B C D E Filter charcoal 2 X 10 34 A B C D E Motor turntable 35 A B C D E C...

Страница 51: ...Section 6 Parts List 6 3 Oven And Cabinet Parts ...

Страница 52: ...Y TOP PAD BOTTOM PAD PACKING CASE ACCESSORY PACK WRAP COVER DOOR PAD Non replaceable items DOOR PROTECTOR INSTALL MATERIAL ASSEMBLY OPERATION MANUAL TOP WALL TEMPLATE EXHAUST DAMPER ASSEMBLY INSTALLATION INSTRUCTIONS Packing And Accessories ...

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