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RICE
1.0
0.5
4 2
DOOR OPEN
COOKING CONTROL
DEFROST kg
TIMER
DEFROST MED
RICE
MED LOW MED HIGH
LOW HIGH
R-210A
SERVICE MANUAL
SX737R210APT/
MICROWAVE OVEN
MODEL
R-210A
In interests of user-safety the oven should be restored to its original
condition and only parts identical to those specified should be used.
TABLE OF CONTENTS
Page
CAUTION, MICROWAVE RADIATION .............................................................................................................. 1
WARNING ................
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R-210A
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R-210A SERVICE MANUAL MICROWAVE OVEN PRODUCT SPECIFICATIONS R-210A GENERAL IMPORTANT INFORMATION APPEARANCE VIEW This Manual has been prepared to provide Sharp Corp. Service engineers with Operation and Service Information. It is recommended that service engineers carefully study the OPERATING SEQUENCE entire text of this manual, so they will be qualified to render satisfactory customer service. FUNCTION OF IMPORTANT CAUTION COMPONENTS MICROWAVE RADIATION DO NOT BECOME EXPOSED TO RADIATION FROM
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R-210A PRODUCT DESCRIPTION SPECIFICATION ITEM DESCRIPTION Power Requirements 110 Volts 60 Hertz Single phase, 2 wire Power Consumption 1.1 KW Power Output 700 watts nominal of RF microwave energy (IEC-705) 600 watts nominal of RF microwave energy (2 litre water load ) Operating frequency 2450 MHz Case Dimensions Width 450 mm Height 295 mm including foot Depth 355 mm Cooking Cavity Dimensions Width 288 mm Height 195 mm Depth 319 mm Turntable diameter 272mm Control Complement 30 min. Single Speed
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R-210A APPEARANCE VIEW 3 2 10 1 OVEN 13 COOKING CONTROL DEFROST MED RICE 9 MED LOW MED HIGH LOW HIGH TIMER DEFROST kg RICE 1.0
0.5 4 2 11 DOOR OPEN 8 14 4 5 6 7 4 15 12 1. Ventilation openings 6. Door seals sealing surfaces 11.Power supply cord 2. Oven lamp 7. Coupling 12.Rating label 3. Door hinges 8. Door open button 13.Turntable 4. Door safety latches 9. Control panel 14.Roller stay 5. See through door 10.Waveguide cover 15.Earth wire CONTROL PANEL 1 VARIABLE COOKING CONTROL There are five
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R-210A OPERATION SEQUENCE 7-1. When the oven door is opened during or after the OFF CONDITION cycle of a cooking program, the 1st latch switch and 1. When the timer knob is at " 0 ", the oven is OFF 2nd latch switch must open their (COM-NO) contacts condition. first. After that the contacts (COM-NC) of the monitor 2. Closing the oven door activates the 1st latch switch, the switch can be closed. 2nd latch switch and monitor switch. 7-2. When the oven door is closed. The contacts (COM- IMPORTANT:
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R-210A FUNCTION OF IMPORTANT COMPONENTS setting of cook time or failure of control unit. Under normal DOOR OPEN MECHANISM operation, the temp. fuse remains closed. However, when The door can be opened by pushing the open button on the abnormally high temperatures are reached within the control panel. When the open button is pushed, the switch oven cavity, the temp. fuse will open at 120˚C, causing the lever on the latch hook is moved upward, operating the oven to shut down. The defective fuse mu
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R-210A because approx. 2 seconds are needed for heat- Note: The ON/OFF time ratio does not exactly corre- ing up the magnetron filament. spond to the percentage of microwave power, SERVICING WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing very high voltage and current. Contact with following parts will result in electrocution. High voltage capacitor, Power transformer, Magnetron, High voltage rectifier assembly, High voltage Fuse, High voltage harness. REMEM
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R-210A TROUBLESHOOTING CHART TEST PROCEDURE AB CD EE E F F III GGH J K POSSIBLE CAUSE AND DEFECTIVE PARTS CONDITION PROBLEM Fuse 13A blows when power cord is plugged into wall outlet. OFF Fuse 13A blows when the CONDITION door is opened. Home fuse blows when power cord is plugged into wall outlet. Oven does not operate at all. Oven goes into cook cy- cle but shuts down before end of cooking cycle. Oven lamp does not light. (Fan motor rotates) Fan motor does not oper- ate, but oven lamp lights
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R-210A TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER A MAGNETRON TEST NEVER TOUCH ANY PART IN THE CIRCUIT WITH YOUR HAND OR AN INSULATED TOOL WHILE THE OVEN IS IN OPERATION. CARRY OUT 3D CHECKS. Isolate the magnetron from the high voltage circuit by removing all leads connected to the filament terminal. To test for an open circuit filament use an ohmmeter to make a continuity test between the magnetron filament terminals, the meter should show a reading of less than 1 ohm. To test for a short
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R-210A TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER Initial temperature.................................................................................................. T1 = 11°C Temperature after (60 + 2) = 62 sec...................................................................... T2 = 21°C Temperature difference Cold-Warm .................................................................... ΔT1 = 10°C Measured output power The equation is “P = 70 x ΔT” ....................................
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R-210A TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER CAUTION: 1˚C CORRESPONDS TO 60 WATTS. REPEAT MEASUREMENT IF THE POWER IS INSUFFICIENT. 1 l 1 l 1 l 1 l (T1 C) (T2 C) (T1 C) (T2 C) Heat up for 2 min. 22 sec. B POWER TRANSFORMER TEST WARNING: High voltages and large currents are present at the secondary winding and filament winding of the power transformer. It is very dangerous to work near this part when the oven is on. NEVER make any voltage measurements of the high- voltage circuits,
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R-210A TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER F. When the internal wire is opened in the high voltage capacitor shows an infinite resistance. G. The resistance across all the terminals and the chassis must be infinite when the capacitor is normal. If incorrect reading are obtained, the high voltage capacitor must be replaced. CARRY OUT 4R CHECKS. E SWITCH TEST Isolate the switch to be tested and using an ohmmeter check between the terminals as described in the following table. CARRY OUT
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R-210A TEST PROCEDURES PROCEDURE COMPONENT TEST LETTER If the fuse 13A is blown by incorrect door switching replace the defective switch(es) and the fuse 13A. If the fuse 13A is blown, there is a shorts or grounds in electrical parts or wire harness. Check them and replace the defective parts or repair the wire harness. CARRY OUT 4R CHECKS. CAUTION: Only replace fuse with the correct value replacement. I TIMER MOTOR (WITH VARI-SWITCH) TEST 6 5 M CARRY OUT 3D CHECKS before any of the following ti
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R-210A COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING: Avoid possible exposure to microwave energy. Please follow the instructions below before operating the oven. 1. Disconnect oven from power supply. 1. Door does not close firmly. 2. Make sure that a definite” click” can be heard when the 2. Door hinge, support or latch hook is damaged. microwave oven door is unlatched. (Hold the door in a 3. The door gasket or seal or damaged. closed position with one hand, then push the door open 4.
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R-210A HIGH VOLTAGE COMPONENTS REMOVAL (HIGH VOLTAGE CAPACITOR, HIGH VOLTAGE RECTIFIER ASSEMBLY AND H.V. FUSE) 9. Disconnect the H.V. fuse from high voltage capacitor. To remove the components, proceed as follows. 10.Remove the HVC cover from the high voltage capacitor. 1. CARRY OUT 3D CHECKS. 11.Now H.V. rectifier assembly, H.V. fuse and H.V. ca- 2. Disconnect the H.V. fuse from the power transformer. pacitor should be free. 3. Disconnect the H.V. wire of the H.V. rectifier assembly from the ma
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R-210A POWER SUPPLY CORD REPLACEMENT Removal Re-install 1. CARRY OUT 3D CHECKS. 1. Insert the power supply cord into the oven cavity back plate. 2. Disconnect the wire leads from the power supply cord. 2. Secure the one (1) screw holding the power supply 3. Remove the one (1) screw holding the power supply cord to the oven cavity back plate.. cord to the oven cavity back plate. 3. Connect the white and black wires of the main wire 4. Remove the power supply cord from the oven cavity harness into
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R-210A CAUTION: CAUTION: • Do not re-use the removed fan blade be- • Do not hit the fan blade strongly when installed cause the hole (for shaft) may be lager because the bracket may be transformed. than normal. • Make sure that the fan blade rotates smooth 9. Remove the two (2) screws holding the fan motor to after installed. the fan duct. • Make sure that the axis of the shaft is not 10. Now, the fan motor is free. slanted. 3. Install the fan motor assembly to the oven cavity by fitting the hol
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R-210A flange of the oven front face. circuit before the door can be opened. 2. With the door closed, adjust latch hook by moving it 3. The monitor switch contacts close when the door is back and forth and up and down. In and out play of the opened. door allowed by the upper and lower position of the 4. Re-install outer case and check for microwave leakage latch hook should be less than 0.5mm. The horizontal around the door with an approved microwave survey position of the latch hook should be a
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R-210A ture, light or sensing of gentle warm air movement around oven door is not abnormal and do not of themselves indicate a leakage of microwave en- ergy from oven cavity. PIN UPPER
OVEN HINGE DOOR PANEL CHOKE
COVER LOWER
OVEN
PIN HINGE Figure C-8. Door Replacement SEALER FILM Installation 1. Put the adhesive tape on the backing film of the sealer film as shown in Fig. C-9. 2. Tear the backing film by pulling the adhesive tape. 3. Put the pasted side of the sealer film on the door pan
