Sharp R-880B Manuel de service

R-880BTABLE OF CONTENTSPageCAUTION, MICROWAVE RADIATION...

8R-880BDOOR OPEN MECHANISMThe door can be opened by pushing the open button on thecontrol panel. When the open button is pushed, the switchlever is mo

R-880B9FAN MOTORThe fan motor drives a blade which draws external cool air.This cool air is directed through the air vanes surroundingthe magnetron an

10R-880BWhen troubleshooting the microwave oven, it is helpful tofollow the Sequence of Operation in performing the checks.Many of the possible causes

R-880B11Fuse 15A blows when power cord is plugged into wall outlet.Fuse M10A blows when the door is opened.Home fuse blows when power cord is plugge

12R-880BA MAGNETRON TESTTEST PROCEDURESPROCEDURELETTER COMPONENT TESTCARRY OUT 3D CHECKS.Isolate the magnetron from high voltage circuit by removing a

R-880B13Initial temperature ... T1 = 11°CTemperature af

14R-880BTEST PROCEDURESPROCEDURELETTER COMPONENT TESTE SWITCH TESTCARRY OUT 3D CHECKS.Isolate the switch to be tested and using an ohmmeter check betw

R-880B15CARRY OUT 3D CHECKS.Disconnect the leads from the motor. Using an ohmmeter, check the resistance between the twoterminals as described in the

16R-880BTEST PROCEDURESPROCEDURELETTER COMPONENT TESTCheck the resistance across the terminals of the heater as described in the following table.Table

R-880B17TEST PROCEDURESPROCEDURELETTER COMPONENT TESTIf the display fails to clear when the STOP/CLEAR pad is depressed, first verify the flat ribbon

R-880B

18R-880BSTEPS OCCURRENCE CAUSE OR CORRECTION1The rated AC voltage is not present at Check supply voltage and oven power cord.Power terminal of CPU con

R-880B19TEST PROCEDURESPROCEDURELETTER COMPONENT TESTTESTING METHOD FOR AH SENSOR AND/OR CONTROL UNITTo determine if the sensor is defective, the simp

20R-880BDESCRIPTION OF LSILSI(IZA927DR)The I/O signal of the LSI(IZA927DR) are detailed in the following table.Pin No. Signal I/O DescriptionTOUCH CON

R-880B218 AN2 IN Input signal which communicates the door open/close information to LSI.Door closed; "H" level signal.Door opened; "L&q

22R-880B29 P75 OUT Key strobe signal.Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminalwhile one of G4 line key on mat

R-880B2342 P26 OUT Convection motor driving signal.To turn on and off shut-off relay(RY1)."L" level during CONVECTION; "H" levelot

24R-880B(1) Structure of Absolute Humidity SensorThe absolute humidity sensor includes two thermistorsas shown in the illustration. One thermistor is

R-880B251. Precautions for Handling Electronic ComponentsThis unit uses CMOS LSI in the integral part of the circuits.When handling these parts, the f

26R-880B1. Disconnect the oven from power supply.2. Make sure that a definite “click” can be heard when themicrowave oven door is unlatched. (Hold the

R-880B27HIGH VOLTAGE TRANSFORMER REMOVAL1. CARRY OUT 3D CHECKS.2. Disconnect the filament leads of high voltage trans-former from high voltage capacit

R-880B1SERVICE MANUALDOUBLE GRILLCONVECTIONMICROWAVE OVEN R-880BGENERAL IMPORTANT INFORMATIONThis Manual has been prepared to provide Sharp Corp. Ser

28R-880BREMOVAL1. CARRY OUT 3D CHECKS.2. Remove the one (1) screw holding the noise filter to thechassis support.3. Release the noise filter from the

R-880B291. Disconnect the oven from the power supply.2. Remove the turntable motor cover by snipping ofmaterial in four corners.3. Where the corners h

30R-880BFigure C-2(a). AC PlugFigure C-2(b). AC Plug WiringGRILL HEATERS (TOP HEATERS) REMOVAL1. CARRY OUT 3D CHECKS.2. Remove the one (1) screw holdi

R-880B31If the 1st. latch switch, 2nd. interlock relay control switchand monitor switch do not operate properly due to a mis-adjustment, the following

32R-880BUpper OvenHingeUpper OvenHingeLower OvenHingeLower OvenHingePinPinChoke CoverDoorPanelscrews.6. Catch two (2) pins of door panel on tw

R-880B33MICROWAVE MEASUREMENTAfter adjustment of door latch switches, monitor switchand door are completed individually or collectively, thefollowing

34R-880BSCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED.2. MICROWAVE POWER LEVEL PAD PRESSED ONCE(100%).3. COOKING TIME PROGRAMMED.4. START PAD TOUCHED

R-880B35Figure O-3(b) Oven Schematic-Grill cooking Condition (BOTTOM HEATER mode)SCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED.2. GRILL PAD TOUCHED T

36R-880BSCHEMATICNOTE: CONDITION OF OVEN FOR GRILL COOKING1. DOOR CLOSED.2.GRILL PAD THREE TIMES.3. COOKING TIME PROGRAMMED.4. STRAT PAD TOUCHED.Fig

R-880B37SCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED.2. MIX PAD TOUCHED THREE TIMES/FOUR TIMES.3. COOKING TIME PROGRAMMED.4. STRAT PAD TOUCHED.Figur

2R-880BGENERAL INFORMATIONWARNINGTHIS APPLIANCE MUST BE EARTHEDIMPORTANTTHE WIRES IN THIS MAINS LEAD ARE COLOURED IN ACCORDANCE WITH THE FOLLOWING COD

38R-880B645123645123ABCDEFGHABCDEFGHFigure S-1. Pictrorial DiagramREDWHTWHTTHERMAL CUT-OUT(OVEN)OVEN LAMP (HALOGEN LAMP)MONITOR RESISTORTHERMALCU

R-880B39Figure S-2. Power Unit Circuit645123645123ABCDEFGHABCDEFGH+–+–+–COMN.O.COMN.O.COMN.O.COMN.O.A 3OVEN LAMPTURNTABLEMOTORBOTTOMHEATERTOPHEA

40R-880B645123645123ABCDEFGHABCDEFGHFigure S-3. CPU Unit CircuitC 4INTGNDVCBUZZER: IF NOT SPECIFIED, 1/10W ± 5% NOTEVALEDVRFANMOTORCONVECTIONMOTOR

R-880B41645123645123ABCDEFGHABCDEFGHFigure S-4. Printed Wiring BoardDIPD8 3 2 312 1115184 D6 R4 CN - C CN - D CN - B CN - A D5 R5 AC AC VRS16FANCONRY1

42R-880BPARTS LISTNote: The parts marked "∆" may cause undue microwave exposure.The parts marked "*" are used in voltage more than

R-880B43∆∆∆∆∆REF. NO. PART NO. DESCRIPTION Q'TY CODE*OVEN PARTS4- 1 DOVN-A513WRY0 Oven cavity 1 BR4- 2 PHOK-A106WRF0 Latch hook 1 AL4- 3 FDUC-A

44R-880BHOW TO ORDER REPLACEMENT PARTSTo have your order filled prompty and correctly, please furnish the following information.1. MODEL NUMBER 2. REF

R-880B45645123645123ABCDEFGHABCDEFGHOVEN AND CABINET PARTS7-97-54-14-307-101-236-147-107-92-16-117-97-17-67-61-104-354-414-387-147-117-167-134-414-254

46R-880B'98SHARP CORP. (9K0.05E) Printed in Japan645123645123ABCDEFGHABCDEFGHDOOR PARTSMISCELLANEOUSCONTROL PANEL PARTS5-85-35-65-45-55-15-96-123

R-880B3APPEARANCE VIEW1. TOP HEATER SYMBOLThe symbol will light when the top heater is in use.2. BOTTOM HEATER SYMBOLThe symbol will light when the bo

4R-880BOPERATION SEQUENCEOFF CONDITIONClosing the door activates the 1st. latch switch and 2nd.interlock relay control switch.IMPORTANT:When the oven

R-880B51. The relay RY3 + RY5 + RY6 are energized.2. The numbers of the digital read-out start the countdown to zero.3. Then the top heaters, turntabl

6R-880Benergized.4. The relay RY2 + RY4 are energized alternately withina 48 seconds time base by the control unit.5. The bottom heater operate throug

R-880B7Selected Temp- Top Heaters Bottom Heatererature (˚C) Power (%) Power (%)250 40 40230 40 40220 40 40200 30 70180 20 70160 10 70150 10 70130 10 6