Sharp R-27STM Service Manual

R-27STM1CONTENTSBEFORE SERVICING - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

10R-27STMH: FUSE T6.3ACARRY OUT 3D CHECKS.If the fuse T6.3A is blown when the door is opened, check the 1st. latch switch, relay (RY1), 2nd. interlock

R-27STM11L: SWITCH UNIT TESTCARRY OUT 1. 3D CHECKS.Isolate the switch unit with the control panel frame to be tested.2. Using an ohmmeter and referri

12R-27STMTOUCH CONTROL PANEL ASSEMBLYOUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units as shown in the touch co

R-27STM13(4) Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.After that procedure, re-connect

14R-27STM WARNING AGAINST HIGH VOLTAGE:Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following pa

R-27STM15CARRY OUT 1. 3D CHECKS.Disconnect the wire leads (main wire harness and H. V. 2. fuse) from high voltage transformer.Disconnect the filament

16R-27STMRemove one (1) screw holding turntable motor to oven cav-6. ity.Remove the TTM packing from the turntable motor.7. Now, the turntable motor i

R-27STM17CARRY OUT 3D CHECKS.Disconnect the leads from the control unit.1. Remove the one (1) screw holding the control panel to the 2. front panel of

18R-27STMDOOR REPLACEMENTREMOVALDisconnect the power supply cord.1. Open the door slightly.2. Insert a putty knife (thickness of about 0.5mm) into the

R-27STM19MICROWAVE MEASUREMENTAfter any repair, the microwave oven must be checked for microwave leakage to ensure continued safe operation. BS EN 603

2R-27STMBEFORE SERVICINGGENERAL IMPORTANT INFORMATIONThis Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service

20R-27STMCIRCUIT DIAGRAMSOven SchematicSCHEMATICNOTE: CONDITION OF OVEN1. DOOR CLOSED.HIGH VOLTAGE TRANSFORMERMAGNETRON H.V. RECTIFIERTURNTABLE MOTORF

R-27STM21Pictorial DiagramBLUMONITOR SWITCH1ST. LATCHSWITCHCOMCOMREDN.C.N.O.N.O.COMGRYGRNGRNGRYTEMPERATUREFUSE (OVEN)2ND. INTERLOCKRELAY CONTROL SWITC

22R-27STMControl Unit Circuit Figure S-2. Control Unit Circuit R27STM.indd 22 11/3/08 2:04:31 PM

R-27STM23Printed Wiring BoardLD1 LD2 LD3 LD4DIPCN-GIC SIDE10112CN-BD22CN-HD40Q2R1C12ZD2(J1)ZD3R20JUMP2JUMP3R2B EJUMP1JUMP4(JUMP A)SP1C6+++---R3D5D6C1R

24R-27STMREF. NO.PARTS CODE DESCRIPTION Q’tyPRICERANKOVEN PARTSELECTRIC PARTS1-1QACC-A126WRZZPower supply cord 1 AT1-1QACC-A088WRE0Power supply cord (

R-27STM25REF. NO.PARTS CODE DESCRIPTION Q’tyPRICERANKMISCELLANEOUS6-1NTNT-A034WRF0Turntable 1 AM6-2FROLPA113WRKZTurntable support 1 ASSCREWS, NUTS AND

26R-27STM7-82-17-87-87-87-97-91-97-71-71-17-12-24-14-164-104-27-87-97-97-87-74-36-16-27-87-67-84-91-87-14-54-114-87-81-57-87-64-44-124-134-144-154-77-

R-27STM275-95-136-55-85-65-25-105-115-125-125-16-46-63-23-13-43-103-93-103-33-63-53-115-145-75-55-45-33-83-103-103-7R 27S T M.indd 27 11/3/08 2: 0

28R-27STMSPAKCE720WREZ 6-1 TURNTABLE TRAY6-4 INSTRUCTION BOOK6-2 TURNTABLE SUPPORTINTO THE OVEN CAVITYNot replaceable items.TRAY PAD ASSY(CPADBA287

R-27STM3WARNING TO SERVICE PERSONNELMicrowave ovens contain circuitry capable of producing very high voltage and current, contact with any part of the

4R-27STMNOTE: Internal capacity is calculated by measuring maximum width, depth and height. Actual capacity for holding food is less. 1514111213 62191

R-27STM5COOK MICRO PCS KG TURN STIR 134567892TOUCH CONTROL PANEL1. DIGITAL DISPLAY2. INDICATORSBUTTONS:3. AUTO COOK4. EXPRESS COOK5. EXPRESS DEFROST6.

6R-27STM100P (HIGH)32 sec. ON70P (MEDIUM HIGH)Approx. 70%100%24 sec. ON 8 sec. OFF14 sec. OFF20 sec. OFF26 sec. OFF50P (MEDIUM) Approx. 50%18 sec. ON3

R-27STM7MAGNETRONHIGH VOLTAGE TRANSFORMER H.V. RECTIFIER ASSEMBLYHIGH VOLTAGE WIREHIGH VOLTAGE CAPACITOR1ST. LATCH SWITCH2ND. INTERLOCK RELAY CONTROLS

8R-27STMTEST PROCEDURESA: MAGNETRON TESTNEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION.CARRY O

R-27STM9CARRY OUT 4. 4R CHECKS.C: HIGH VOLTAGE RECTIFIER TESTCARRY OUT 3D CHECKS.Isolate the high voltage rectier assembly from the HV circuit. The