Sharp R-770B Manual de Serviço

R-770B SERVICE MANUALSHARP CORPORATIONTABLE OF CONTENTSPageCAUTION, MICROWAVE RADIATION...

8R-770BWhen troubleshooting the microwave oven, it is helpful tofollow the Sequence of Operation in performing the checks.Many of the possible causes

R-770B9MAGNETRONHIGH VOLTAGE TRANSFORMERH.V. RECTIFIER ASSEMBLYHIGH VOLTAGE CAPACITOR1ST. LATCH SWITCHMONITOR SWITCH2ND. INTERLOCK RELAY CONTROL SWIT

10R-770BA MAGNETRON TESTTEST PROCEDURESPROCEDURELETTER COMPONENT TESTCARRY OUT 3D CHECKS.Isolate the magnetron from high voltage circuit by removing a

R-770B11Initial temperature ... T1 = 11°CTemperature af

12R-770BH BLOWN FUSE 15ATEST PROCEDURESPROCEDURELETTER COMPONENT TESTD. A short-circuited capacitor shows continuity all the time.E. An open capacitor

R-770B13TEST PROCEDURESPROCEDURELETTER COMPONENT TESTCARRY OUT 4R CHECKS.CAUTION: Only replace fuse 15A with the correct value replacement.J MOTOR WIN

14R-770BTEST PROCEDURESPROCEDURELETTER COMPONENT TESTM CONTROL PANEL ASSEMBLY TESTThe touch control panel consists of circuits including semiconductor

R-770B15PROCEDURELETTERTEST PROCEDURES (CONT'D)COMPONENT TESTO RELAY TESTCARRY OUT 3D CHECKS.Remove the outer case and check voltage between Pin

16R-770BTOUCH CONTROL PANEL ASSEMBLYOUTLINE OF TOUCH CONTROL PANELThe touch control section consists of the following units asshown in the touch contr

R-770B171 C1 IN Terminal not used.2 VL1 IN Power source voltage input terminal.Standard voltage for LCD.3-5 AN7-AN5 IN Heating constant compensation t

R-770B

18R-770B31 P73 OUT Key strobe signal.Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminalwhile one of G2 line key on mat

R-770B19Pin No. Signal I/O Description51-80 SEG39-SEG10 OUT Segment data signal.Connected to LCD.The relation between signals are as follows:LSI signa

20R-770B1. Precautions for Handling Electronic ComponentsThis unit uses CMOS LSI in the integral part of thecircuits. When handling these parts, the f

R-770B211. Disconnect the oven from power supply.2. Make sure that a definite” click” can be heard when themicrowave oven door is unlatched. (Hold the

22R-770BHIGH VOLTAGE COMPONENTS REMOVAL(HIGH VOLTAGE CAPACITOR, HIGH VOLTAGE RECTIFIER ASSEMBLY AND HIGH VOLTAGE FUSE)To remove the components, procee

R-770B231. Disconnect the oven from the power supply.2. Remove the turntable motor cover by snipping ofmaterial in four corners.3. Where the corners h

24R-770BRemoval1. CARRY OUT 3D CHECKS.2. Remove the one (1) screw holding the green/yellowwire to the cavity rear plate.3. Disconnect the leads of the

R-770B25If the 1st. latch switch, 2nd. interlock relay control switchand monitor switch do not operate properly due to a mis-adjustment, the following

26R-770BMICROWAVE MEASUREMENTAfter adjustment of door latch switches, monitor switchand door are completed individually or collectively, thefollowing

R-770B27SCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSE.2. MICROWAVE POWER LEVEL PAD PRESSED ONCE(100%).3. COOKING TIME PROGRAMMED.4. STRAT PAD PRESSED.

R-770B1SERVICE MANUALMICROWAVE OVEN WITH TOPAND BOTTOM HEATER R-770BGENERAL IMPORTANT INFORMATIONThis Manual has been prepared to provide Sharp Corp.

28R-770BSCHEMATICNOTE: CONDITION OF OVEN FOR GRILL COOKING1. DOOR CLOSE.2.GRILL PAD PRESSED TREE TIMES.3. COOKING TIME PROGRAMMED.4. STRAT PAD PRESSED

R-770B29SCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSE.2.GRILL MIX PAD PRESSED THREE TIMES FOR GRILL MIX HIGH WITH BOTTOM HEATER.GRILL MIX PAD PRESSED

30R-770B645123645123ABCDEFGHABCDEFGHFigure S-1. Pictrorial DiagramREDWHTGRYTHERMAL CUT-OUT(OVEN)OVEN LAMP (HALOGEN LAMP)MONITOR RESISTORTHERMALCU

R-770B31Figure S-2. Power Unit Circuit645123645123ABCDEFGHABCDEFGH+–+–+–COMN.O.COMN.O.COMN.O.COMN.O.A 3OVEN LAMPTURNTABLEMOTORBOTTOMHEATERTOPHEA

32R-770B645123645123ABCDEFGHABCDEFGHFigure S-3. Control Panel CircuitC 4INTGNDVCBUZZER: IF NOT SPECIFIED, 1/10w ± 5% NOTEVALEDVRFANMOTOROVEN LAMPT

R-770B33645123645123ABCDEFGHABCDEFGHFigure S-4. Printed Wiring BoardDIPD8 3 2 312 1115184 D6 R4 CN - C CN - D CN - B CN - A D5 R5 AC AC VRS16FANCONRY1

R-770B34PARTS LISTNote: The parts marked "∆" may cause undue microwave exposure.The parts marked "*" are used in voltage more than

R-770B35Note: The parts marked "∆" may cause undue microwave exposure.The parts marked "*" are used in voltage more than 250V.REF.

R-770B36645123645123ABCDEFGHABCDEFGHOVEN AND CABINET PARTS7-97-54-14-307-107-107-112-16-117-117-11-104-254-334-297-107-124-324-194-181-112-24-234-264-

R-770B37645123645123ABCDEFGHABCDEFGHCONTROL PANEL PARTSDOOR PARTSMISCELLANEOUS5-85-35-65-45-55-15-96-123-25-75-26-16-86-106-2Actual wire harness may b

2R-770BPRODUCT DESCRIPTIONSPECIFICATIONITEM DESCRIPTIONPower Requirements 220 Volts50 HertzSingle phase, 3 wire earthedPower Consumption Microwave coo

R-770B38'98SHARP CORP. (03K0.120E) Printed in JapanPACKING AND ACCESSORIESTRAY HOLDER (SPADFA424WRE0)TURNTABLE TRAYHIGH RACKLOW RACKLAMP CAUTION

R-770B3APPEARANCE 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-770BOPERATION SEQUENCEOFF CONDITIONClosing the door activates the 1st. latch switch, 2nd.interlock relay control switch.IMPORTANT:When the oven doo

R-770B5TOP HEATER MODEIn this mode, the food is cooked by the top heaters. Pressthe GRILL pad once and then enter the cooking time bypressing the numb

6R-770BWhen the START pad is pressed, the following operationsoccur:Figure O-4(b) on page 291. The relay RY5 + RY6 are energized.2. The numbers of the

R-770B7DOOR OPEN MECHANISMThe door can be opened by pushing the open button on thecontrol panel. When the open button is pushed, the switchlever is mo