Sharp R-204 Service Manual

R-204(W)TABLE OF CONTENTSPageCAUTION, MICROWAVE RADIATION...

8R-204(W)FUNCTION OF IMPORTANT COMPONENTSIf the food load is overcooked, by either error in cook timeor defect in the control unit, the temperature fu

R-204(W)9When troubleshooting the microwave oven, it is helpful tofollow the Sequence of Operation in performing the checks.Many of the possible cause

10R-204(W)TEST PROCEDURESPROCEDURELETTERCOMPONENT TESTA MAGNETRON TESTCARRY OUT 3D CHECKS.Isolate the magnetron from the high voltage circuit by remov

R-204(W)11TEST PROCEDURESPROCEDURELETTERCOMPONENT TESTRoom temperature ... To = 21˚C Initial temperature ... T1

12R-204(W)F TEMPERATURE FUSE TESTCARRY OUT 3D CHECKS.A continuity check across the temperature fuse terminals should indicate a closed circuit unless

R-204(W)13TEST PROCEDURESPROCEDURELETTERCOMPONENT TESTMEASURING POINTS INDICATION OF OHMMETERBetween N and L Approx. 680 kΩBetween terminal N and WHIT

14R-204(W)TEST PROCEDURESPROCEDURELETTERCOMPONENT TESTL RELAY TESTCARRY OUT 3D CHECKS.Remove the outer case and check voltage between Pin No. 3 of the

R-204(W)15Control UnitControl unit consists of LSI, power source circuit, synchro-nizing signal circuit, ACL circuit, buzzer circuit, encodercircuit,

16R-204(W)Pin No. Signal I/O Description8 P20 OUTMagnetron high-voltage circuit driving signal.To turn on and off the cook relay (RY2).The signal hold

R-204(W)17SERVICINGAs for the sensor-related controls of the touchcontrol panel, checking them is possible if thedummy resistor(s) with resistance equ

R-204(W)CAUTIONMICROWAVE RADIATIONPersonnel should not be exposed to the microwave energy which may radiate from themagnetron or other microwave gener

18R-204(W)COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDUREWARNING: Avoid possible exposure to microwave energy. Please follow the instructions belowbefo

R-204(W)19MAGNETRON REMOVAL1. CARRY OUT 3D CHECKS.2. Disconnect the wire leads from magnetron.3. Remove the three (3) screws holding the magnetron tot

20R-204(W)TURNTABLE MOTOR REMOVALCOOLING FAN MOTOR REMOVALREMOVAL1. CARRY OUT 3D CHECKS.2. Remove the magnetron from the waveguide. Refer tochapter &q

R-204(W)21POWER SUPPLY CORD REPLACEMENTRemoval1. CARRY OUT 3D CHECKS.2. Remove the single (1) screw holding the green/yellowwire to the oven cavity.3.

22R-204(W)REMOVAL1. Disconnect the oven from the power supply.2. Open the door slightly.3. Insert a putty knife (thickness of about 0.5mm) into thegap

R-204(W)23SEALER FILMInstallation1. Put the adhesive tape on the backing film of the sealerfilm as shown in Fig. C-7.2. Tear the backing film by pulli

24R-204(W)MICROWAVE MEASUREMENTAfter adjustment of 1st. interlock switch, 2nd. interlockrelay control switch, monitor switch and door are com-pleted i

R-204(W)25TEST DATA AT A GLANCEPARTS SYMBOL VALUE / DATAFuse F1 M 8A 250VTemperature fuse (OVEN) TF 120°COven lamp OL 240–250 V 25WHigh voltage capa

26R-204(W)645123645123ABCDEFGHABCDEFGHFigure S-1. Pictrorial DiagramWHTWHTREDHIGH VOLTAGE COMPONENTSMG: MAGNETRONC:HIGH VOLTAGECAPACITORH.V.RECTIFIERS

R-204(W)271ABCDEFGHABCDEFGH23456123456Figure S-2. Control Unit CircuitA 3C1 470µ/35vD22D21R40 3.3kR10 1k 1/2wC2 0.1µ/50vC2110µ/35vSP1ZD1 HZ6A3ZD2 HZ4A

R-204(W)1WARNINGNever operate the oven until the following points are ensured.(A) The door is tightly closed.(B) The door brackets and hinges are not

28R-204(W)Figure S-3. Printed Wiring Board1ABCDEFGHABCDEFGH23456123456FA701DR0R51R50R52R54R55JP2JP1JP6JP10JP11JP14C21JP18Q1Q20Q21D22OMDUD21VRS1T1PS765

R-204(W)29**∆***PARTS LISTELECTRIC PARTSC RC-QZA211WRE0 High voltage capacitor 1 AVC RC-QZA285WRZZ High voltage capacitor (Interchangeable) 1 AWF1 QFS

30R-204(W)Note: The parts marked "∆" may cause undue microwave exposure.The parts marked "*" are used in voltage more than 250V.RE

R-204(W)311ABCDEFGHABCDEFGH23456123456OVEN PARTS7-82-17-87-87-87-8OL6-34-11R4-37-37-52-24-74-104-26-16-27-37-27-37-97-9FMT7-14-57-37-67-37-27-1CF2SW1S

32R-204(W)1ABCDEFGHABCDEFGH234561234565-26-45-55-35-45-65-75-1Actual wire harness may be different than illustration.3-93-93-13-83-23-33-53-63-73-4CON

R-204(W)33PACKING AND ACCESSORIES6-1 TURNTABLE TRAY6-5 INSTRUCTION BOOK6-2 TURNRTABLE SUPPORTINTO THE OVEN CAVITYNot replaceable items.TRAY PAD ASS

34R-204(W)'01 SHARP CORP. (8S1.31E) Printed in Germany

2R-204(W)REMEMBER TO CHECK 3D1) Disconnect the supply.2) Door opened, and wedged open.3) Discharge high voltage capacitor.WARNING: AGAINST THE CHARGE

R-204(W)3E Los hornos de microondas contienen circuitos eléctricos capaces de producir voltajes de alta tensión y descargaseléctricas. Para evitar el

4R-204(W)I I forni a microonde contengono un circuito elettrico in grado di generare tensioni e correnti estremamente elevate.L’eventuale contatto con

R-204(W)5PRODUCT DESCRIPTIONSPECIFICATIONITEM DESCRIPTIONPower Requirements 230 Volts50 HertzSingle phase, 3 wire earthedPower Consumption 1.18 kWPowe

6R-204(W)APPEARANCE VIEWOVEN1. Control panel2. Door opening button3. Waveguide cover4. Seal packing5. Oven cavity6. Door7. Door safety latchCONTROL PA

R-204(W)7OPERATION SEQUENCEOFF CONDITIONClosing the door activates all door interlock switches (1st.interlock switch and 2nd. interlock relay control