Sharp R-880F Service Manual

Double grill convection microwave oven

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Operation manual and cookbook (71 pages)

Service manual (3 pages)

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Page 1: Table Of Contents
R-880F(S) SERVICE MANUAL S8209R880FPJS DOUBLE GRILL CONVECTION MICROWAVE OVEN R-880F(S) MODEL DO UB LE G RI LL CO NV EC TI O N Se ns or In interests of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used.
Page 2 R-880F(S)
Page 3: Caution Microwave Radiation
APPEARANCE VIEW R-880F(S) GENERAL IMPORTANT INFORMATION OPERATING SEQUENCE 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 entire FUNCTION OF IMPORTANT text of this manual, so they will be qualified to render satisfactory COMPONENTS customer service.
Page 4: General Information
R-880F(S) PRODUCT DESCRIPTION SPECIFICATION ITEM DESCRIPTION Power Requirements 230 - 240 Volts 50 Hertz Single phase, 3 wire earthed Power Consumption Microwave cooking 1.6 kW Top Heater mode 1.3 kW Grill cooking Bottom heater mode 0.9 kW Top and Bottom heater mode 2.1 kW...
Page 5: Appearance View
R-880F(S) APPEARANCE VIEW OVEN 1. Oven lamp 2. Top heaters (Grill heaters) 3. See through door 4. Door hinges 5. Door safety latches 6. Door seals and sealing surfaces 7. Bottom heater 8. Oven cavity 9. Turntable motor shaft 10.Ventilation openings...
Page 6: Operation Sequence
Shown in the display is remaining time. Figure O-1 on page 33 6. MONITOR SWITCH CIRCUIT 1. The oven display will show " SHARP MICRO- WAVE The monitor switch is mechanically controlled by the OVEN " . oven door, and monitors the operation of the 1st. latch 2.
Page 7 R-880F(S) 1. The relay RY3 + RY5 + RY6 are energized. In these modes, the food is cooked by the top heaters and 2. The numbers of the digital read-out start the count the microwave energy. Press the MIX pad once for HIGH down to zero.
Page 8 R-880F(S) energized. NOTE: 4. The relay RY2 + RY4 are energized alternately within 1. In case of Automatic operations, the limitations of a 48 seconds time base by the control unit. power output are not carried out. 5. The bottom heater operate through the relay RY4 is 2.
Page 9 R-880F(S) 3. Sensor detects moisture and humidity and calculates Selected Temp- Top Heaters Bottom Heater cooking time and variable power. erature (˚C) Power (%) Power (%) AH SENSOR COOKING SEQUENCE 1. In case the AH sensor cooking condition is started, the...
Page 10: Function Of Important Components
R-880F(S) judgment that there is a fire in the oven cavity and will ON/OFF TIME RATIO switch off the relays to the power transformer, fan In grill cooking, convection cooking or mix cooking, the top motor, turntable motor and the oven lamp. The LSI heaters, bottom heater or magnetron operate whithin a 48 also stops counting down.
Page 11 R-880F(S) FUSE F10A 250V NOISE FILTER 1. If the wire harness or electrical components are short- The noise filter assembly prevents radio frequency inter- circuited, this fuse blows to prevent an electric shock or ference that might flow back in the power circuit.
Page 12: Servicing
If the water remains cold carry out 3D checks and re-examine the Sharp recommend that wherever possible fault-finding is connections to the component being tested. carried out with the supply disconnected. It may in, some...
Page 13 R-880F(S) SWITCHES MIS-ADJUSTMENT HARNESS WIRE OPENED HARNESS WIRE SHORTED LAMP OVEN CORD SUPPLY POWER SENSOR P.W.B. PATTERN FOIL RELAY RELAY RELAY RELAY RELAY RELAY UNIT PANEL CONTROL TOUCH FUSE VOLTAGE HIGH THERMISTOR HEATER BOTTOM HEATERS MOTOR CONVECTION MOTOR TURNTABLE MOTOR...
Page 14: Test Procedure
R-880F(S) TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 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 high voltage circuit by removing all leads connected to filament terminal.
Page 15 R-880F(S) TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Initial temperature ....................T1 = 11 C Temperature after (47 + 3) = 50 sec ..............T2 = 21 C Temperature difference Cold-Warm............... T1 = 10C Measured output power The equation is “P = 90 x T” ............P = 90 x 10 C = 900 Watts JUDGMENT: The measured output power should be at least 15 % of the rated output power.
Page 16 R-880F(S) TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST C. A normal capacitor shows continuity for a short time (kick) and then a resistance of about 10M after it has been charged. D. A short-circuited capacitor shows continuity all the time. E. An open capacitor constantly shows a resistance about 10 M because of its internal 10M resistance.
Page 17 R-880F(S) TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST BLOWN FUSE 15A CARRY OUT 3D CHECKS. If the fuse 15A is blown, there could be a short or ground in electrical parts or wire harness. Check them and replace the defective parts or repair the wire harness.
Page 18 R-880F(S) TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST THERMISTOR TEST 1. CARRY OUT 3D CHECKS. 2. Disconnect connector-D from the control unit. Measure the resistance of the thermistor with an ohmmeter. Connect the ohmmeter leads to Pin No’s D1 and D3.
Page 19 R-880F(S) TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST momentary contact. If the control unit responds by clearing with a beep the key unit is faulty and must be replaced. If the control unit does not respond, it is a faulty and must be replaced. If a specific pad does not respond, the above method may be used (after clearing the control unit) to determine if the control unit or key pad is at fault.
Page 20 R-880F(S) TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST NOTE: *At the time of these repairs, make a VRS1 visual inspection of the varistor for burn- ing damage and examine the transformer with tester for the presence of layer short circuit (check primary coil resistance).
Page 21 R-880F(S) TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 6-2. Place the container on the center of tray in the oven cavity. 6-3. Close the door. 6-4. Touch Fresh Vegetables pad. 6-5. The control panel is in automatic Sensor operation. 6-6. The display will start to count down the remaining cooking time, and the oven will turn off automatically after the water is boiling (babbling).
Page 22: Touch Control Panel Assembly
R-880F(S) TOUCH CONTROL PANEL ASSEMBLY OUTLINE OF TOUCH CONTROL PANEL The touch control section consists of the following units as 4) Reset Circuit shown in the touch control panel circuit. A circuit to generate a signal which resets the LSI to the initial state when power is supplied.
Page 23 R-880F(S) Pin No. Signal Description Input signal which communicates the door open/close information to LSI. Door closed; "H" level signal. Door opened; "L" level signal. AH sensor input. This input is an analog input terminal from the AH sensor circuit, and connected to the A/D converter built into the LSI.
Page 24 R-880F(S) Pin No. Signal Description Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal while one of G3 line key on matrix is touched. Key strobe signal. Signal applied to touch-key section. A pulse signal is input to P44 - P47 terminal while one of G2 line key on matrix is touched.
Page 25 R-880F(S) Pin No. Signal Description Convection motor driving signal. To turn on and off shut-off relay(RY1). During cooking "L" level during CONVECTION; "H" level (Convection) otherwise. (Relay RY1 does not turn on at preheating mode.) Fan motor driving signal. To turn on and off the fan motor relay RY5.
Page 26 R-880F(S) ABSOLUTE HUMIDITY SENSOR CIRCUIT With this voltage given, the switches SW1 to SW5 in (1) Structure of Absolute Humidity Sensor the LSI are turned on in such a way as to change the The absolute humidity sensor includes two thermistors resistance values in parallel with R107 ~ R111 of IC2.
Page 27 R-880F(S) SERVICING 1. Precautions for Handling Electronic Components A. On some models, the power supply cord between the This unit uses CMOS LSI in the integral part of the circuits. touch control panel and the oven itself is so short that When handling these parts, the following precautions the two can't be separated.
Page 28: Component Replacement And Adjustment Procedure
High voltage transformer and Oven cav- To prevent an electric shock, take the following ity. manners. 3) Sharp edge: 1. Before wiring, Bottom plate, Oven cavity, Waveguide flange, 1) Disconnect the power supply. Chassis support and other metallic plate.
Page 29 R-880F(S) CAUTION: WHEN REPLACING HIGH VOLTAGE the high voltage rectifier assembly. RECTIFIER ASSEMBLY, ENSURE THAT 6. Remove one (1) screw holding capacitor holder to the THE CATHODE (EARTH) CONNECTION oven cavity rear plate. IS SECURELY FIXED TO THE CAPACI- 7. Release the capacitor holder from the fan duct.
Page 30: Fan Motor Replacement
R-880F(S) THERMISTOR REMOVAL 1. CARRY OUT 3D CHECKS. 6. Remove the one (1) screw holding the thermistor angle 2. Now, the back plate with the sub back plate should be to the oven cavity rear plate. removed. 7. Remove the thermistor angle together with thermistor 3.
Page 31 3. Where the corners have been snipped off, bend corner cover. areas flat. No sharp edge must be evident after re- moval of turntable motor cover. NOTE: The one (1) screw to fit the turntable motor cover 4.
Page 32 R-880F(S) GRIL HEATERS (TOP HEATERS) REMOVAL 1. CARRY OUT 3D CHECKS. 6. Remove the reflector from the oven cavity by sliding it 2. Remove the one (1) screw holding the exhaust duct to leftward. the oven cavity. 7. Remove the grill heaters and the short terminal to- 2.
Page 33 R-880F(S) DOOR REPLACEMENT 3. Re-install the latch spring to the latch head. Re-install REMOVAL the latch spring to the door frame. Re-install latch head 1. CARRY OUT 3D CHECKS. to door frame. 2. Push the open button and open the door slightly.
Page 34: Microwave Measurement
R-880F(S) MICROWAVE MEASUREMENT After adjustment of door latch switches, monitor switch Recommended instruments are: NARDA 8100 and door are completed individually or collectively, the following leakage test must be performed with a survey NARDA 8200 HOLADAY HI 1500 instrument and it must be confirmed that the result meets...
Page 35: Wiring Diagram
R-880F(S) NOTE: Indicates components with potential above 250 V. SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. OR CLOCK APPEAR ON DISPLAY. NOISE FILTER UNIT THERMAL CUT-OUT FUSE F10A (MG.) CONTROUNIT RY2: 2ND. INTERLOCK RELAY 1ST. THERMAL CUT-OUT(OVEN) LATCH SWITCH...
Page 36 R-880F(S) SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED. NOTE: Indicates components with potential above 250 V. 2. GRILL PAD TOUCHED ONCE. 3. COOKING TIME PROGRAMMED. 4. STRAT PAD TOUCHED. NOISE FILTER UNIT FUSE THERMAL CUT-OUT (MG.) F10A CONTROUNIT RY2: 2ND. INTERLOCK...
Page 37 R-880F(S) SCHEMATIC NOTE: CONDITION OF OVEN FOR GRILL COOKING 1. DOOR CLOSED. 2. GRILL PAD THREE TIMES. 3. COOKING TIME PROGRAMMED. 4. STRAT PAD TOUCHED. NOISE FILTER UNIT FUSE THERMAL CUT-OUT F10A (MG.) CONTROUNIT RY2: 2ND. INTERLOCK RELAY 1ST. THERMAL...
Page 38 R-880F(S) SCHEMATIC NOTE: Indicates components with potential above 250 V. NOTE: CONDITION OF OVEN 1. DOOR CLOSED. 2. MIX PAD TOUCHED ONCE/TWICE. 3. COOKING TIME PROGRAMMED. NOTE: The microwave relay RY2 and heater relay RY3 could not turn on simultaneously.
Page 39: Pictorial Diagram
R-880F(S) NEUTRAL LIVE EARTH...
Page 40: Power Unit Circuit
R-880F(S) Q2 2SB1238 R4 27 D1-4 R5 4.7k 1N4002 AC230-240V 50Hz R3 510 1/2w 2SB1238 R2 680 1/2w BUZZER R6 3.3k FAN MOTOR FAN MOTOR CONVECTION CONVECTION MOTOR MOTOR N.O. OVEN LAMP TURNTABLE KRC243M MOTOR OVEN LAMP TURNTABLE MOTOR 10 /35v BOTTOM N.O.
Page 41: Control Panel Circuit
R-880F(S) SEG1 SEG2 SEG3 SEG4 SEG5 SEG6 SEG7 SEG8 SEG9 SEG10 SEG11 SEG12 SEG13 SEG14 SEG15 SEG16 SEG17 SEG18 SEG19 SEG20 SEG21 SEG22 SEG23 SEG24 SEG25 SEG26 SEG27 SEG28 SEG29 SEG30 SEG31 SEG15 COM1 COM2 COM3 SEG9 COM4 SEG8 COM5...
Page 42: Printed Wiring Board
R-880F(S) CN - C VRS1 CN - A LOT NO. Figure S-4. Printed Wiring Board...
Page 43: Parts List
R-880F(S) PARTS LIST Note: The parts marked " " may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. PART NO. DESCRIPTION Q'TY CODE ELECTRIC PARTS 1- 1 QSW-MA131WRE0 1st. latch switch, 2nd. interlock relay control switch...
Page 44 R-880F(S) Note: The parts marked " " may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. PART NO. DESCRIPTION Q'TY CODE RTRNPA105DRE0 Transformer VRS1 RH-VZA032DRE0 Varistor (10G471K) VHEHZ161///-1 Zener diode (HZ16-1)
Page 45 R-880F(S) Note: The parts marked " " may cause undue microwave exposure. The parts marked "*" are used in voltage more than 250V. REF. NO. PART NO. DESCRIPTION Q'TY CODE 6- 7 FW-VZB045WRE0 Switch harness 6- 8 FW-VZB946WREZ Main wire harness...
Page 46 R-880F(S) OVEN AND CABINET PARTS 6-11 4-15 4-33 7-10 4-25 7-12 4-23 4-29 4-26 7-10 7-10 4-37 4-42 1-14 1-11 1-15 1-20 1-12 7-17 1-22 7-15 4-30 4-31 7-10 7-13 7-10 4-34 1-16 7-10 4-40 4-27 1-21 4-19 4-43 4-32...
Page 47 R-880F(S) CONTROL PANEL PARTS 3-3-3 DOOR PARTS 3-3-1 3-3-2 MISCELLANEOUS Actual wire harness may be different than illustration. 6-10...
Page 48 R-880F(S) COPYRIGHT © 2002 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be reproduced, stored in retrieval systems, or transmitted in any form or by any means, electronic, mechanical, photocopying, recording, or otherwise, without prior written permission of the publisher.

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