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DMO2420MicrowaveParts and Service Manual

9DMO2420BDMO2420RDMO2420SDESCRIPTION AND FUNCTION OF COMPONENTSDOOR OPEN MECHANISMThe door is opened by pushing the open button on the controlpanel, r

10DMO2420BDMO2420RDMO2420STROUBLESHOOTING GUIDENever touch any part in the circuit with your hand or an uninsulated tool while the power supply is con

11DMO2420BDMO2420RDMO2420SCK = Check / RE = ReplaceSHORT IN POWER CORDSHORT OR OPENED WIRINGMAGNETRONPOWER TRANSFORMERH.V. RECTIFIER ASSEMBLYHIGH VOL

12DMO2420BDMO2420RDMO2420SB POWER TRANSFORMER TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door and block it open.3

13DMO2420BDMO2420RDMO2420STEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door

14DMO2420BDMO2420RDMO2420STEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove outer case.2. Open the door

15DMO2420BDMO2420RDMO2420SH BLOWN MONITOR FUSE TESTTEST PROCEDURESPROCEDURELETTERCOMPONENT TEST1. Disconnect the power supply cord, and then remove ou

16DMO2420BDMO2420RDMO2420S4) Reconnect the power supply cord after the outer case is installed.5) Run the oven and check all functions.The following s

17DMO2420BDMO2420RDMO2420STEST PROCEDURESPROCEDURELETTERCOMPONENT TESTmay be used (after clearing the control unit) to determine if the control unit o

18DMO2420BDMO2420RDMO2420STo protect the electronic circuits, this model is provided with a fine foil pattern added to the primary onthe PWB, this foi

1DMO2420BDMO2420RDMO2420SWARNING TO SERVICE PERSONNELMicrowave ovens contain circuitry capable of pro-ducing very high voltage and current, contact wi

19DMO2420BDMO2420RDMO2420STEST PROCEDURESPROCEDURELETTERCOMPONENT TEST10) Discharge high voltage capacitor.11) Reconnect all leads removed from compon

20DMO2420BDMO2420RDMO2420STEST PROCEDURESPROCEDURELETTERCOMPONENT TEST9-3. Close the door.9-4. Touch the Timer/Clock pad once, the Power Level pad twi

21DMO2420BDMO2420RDMO2420STOUCH CONTROL PANEL ASSEMBLYOUTLINE OF TOUCH CONTROL PANEL4) Relay CircuitA circuit to drive the magnetron, fan motor, turnt

22DMO2420BDMO2420RDMO2420SLSI(IXA098DR)The I/O signal of the LSI(IXA098DR) is detailed in the following table.Pin No. Signal I/O Description1 COM5 OUT

23DMO2420BDMO2420RDMO2420S34 INT0 IN Signal synchronized with commercial power source frequency.This is the basic timing for time processing of LSI.35

24DMO2420BDMO2420RDMO2420S52 NC_Terminal not used.53 XCOUT OUT Terminal not used.54 XCIN IN Connected to VC.55 NC_Terminal not used.56 VCC IN Power so

25DMO2420BDMO2420RDMO2420SABSOLUTE HUMIDITY SENSOR CIRCUIT(1) Structure of Absolute Humidity SensorThe absolute humidity sensor includes two thermisto

26DMO2420BDMO2420RDMO2420S1. Precautions for Handling Electronic ComponentsThis unit uses CMOS LSI in the integral part of thecircuits. When handling

27DMO2420BDMO2420RDMO2420STo remove the outer case, proceed as follows.1. Disconnect the power supply cord.2. Open the oven door and block it open.3.

28DMO2420BDMO2420RDMO2420SPOWER TRANSFORMER REMOVALReinstallation1. Rest transformer on the bottom plate with its primaryterminals toward the oven fac

2DMO2420BDMO2420RDMO2420SMICROWAVE MEASUREMENT PROCEDUREA. Requirements:1) Microwave leakage limit (Power density limit): The power density of microwa

29DMO2420BDMO2420RDMO2420SCONTROL PANEL ASSEMBLY REMOVALPOSITIVE LOCK® CONNECTOR (NO-CASE TYPE) REMOVALFigure C-2. Positive lock® connector1. Discon

30DMO2420BDMO2420RDMO2420SCOOLING FAN MOTOR REMOVALREMOVAL1. Disconnect the power supply cord and then remove outercase.2. Open the door and block it

31DMO2420BDMO2420RDMO2420SDOOR REPLACEMENT1. Disconnect the power supply cord, and then removeouter case.2. Open the door and block it open.3. Dischar

32DMO2420BDMO2420RDMO2420SNote: The door on a microwave oven is designed to act asan electronic seal preventing the leakage ofmicrowave energy from ov

33DMO2420BDMO2420RDMO2420S645123645123ABCDEFGHABCDEFGHFigure S-1. Pictorial DiagramHIGH VOLTAGECAPACITORHIGH VOLTAGEWIRE AH.V. RECTIFIERPOWER SUPPLY C

34DMO2420BDMO2420RDMO2420S645123645123ABCDEFGHABCDEFGHFigure S-2. Power Unit Circuit+–+–+–A 1CN-AR4 27D5T1134D1D3D2D46abcdVRS1(J1)D7D81SS270A1SS270A10

35DMO2420BDMO2420RDMO2420S645123645123ABCDEFGHABCDEFGHFRESHVEGETABLESBEVERAGE BREAKFASTLUNCHPOPCORNSNACKSMICROWAVERECIPESSTARTINSTANT ONFISHSEAFOODPOW

36DMO2420BDMO2420RDMO2420S645123645123ABCDEFGHABCDEFGHFigure S-4. Printed Wiring Board of Power UnitWH - 1SH - BSH - A1C3C4C5R3C2FC110D4D2D1D3(J1)D9(D

Technical Service950 S. Raymond Ave.Pasadena, CA 91105800-353-2267Part # 85927

3DMO2420BDMO2420RDMO2420SSERVICE MANUALMICROWAVE OVENDMO2420B/DMO2420R/DMO2420SFOREWORDThis Manual has been prepared to provide Dacor Service Personne

4DMO2420BDMO2420RDMO2420SITEM DESCRIPTIONPower Requirements 120 Volts / 13.8 Amperes60 HertzSingle phase, 3 wire groundedPower Output 1200 watts (IEC

5DMO2420BDMO2420RDMO2420SWhere a two-pronged wall-receptacle is encountered, it is the personalresponsibility and obligation of the customer to contac

6DMO2420BDMO2420RDMO2420SOPERATIONDESCRIPTION OF OPERATING SEQUENCEThe following is a description of component functions duringoven operation.OFF COND

7DMO2420BDMO2420RDMO2420SThe time of supplementary cooking is determined by experi-ment with each food category and inputted into the LSI.An example o

8DMO2420BDMO2420RDMO2420SFigure O-1. Oven Schematic-Off ConditionSCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED.2. CLOCK APPEARS ON DISPLAY.SCHEMATICN