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Sharp R-1480 manual

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Table of contents for the manual

  • Page 1

    R-1480 R-1481 R-1482 In the interest of user-safety the oven should be restored to its original condition and only parts identical to those specified should be used. WARNING TO SERVICE PERSONNEL: Microwave ovens con- tain circuitry capable of producing very high voltage and current, contact with following parts may result in a severe, possibly fata[...]

  • Page 2

    R-1480 R-1481 R-1482 PRECA UTIONS T O BE OBSER VED BEFORE AND DURING SER VICING T O A V OID POSSIBLE EXPOSURE T O EXCESSIVE MICR O W A VE ENERGY (a) Do not operate or allow the oven to be operated with the door open. (b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make [...]

  • Page 3

    1 R-1480 R-1481 R-1482 W ARNING T O SER VICE PERSONNEL Microwave ovens contain circuitry capable of pro- ducing very high voltage and current, contact with following parts may result in a severe, possibly fatal, electrical shock. (Example) High Voltage Capacitor, High Voltage Power Trans- former, Magnetron, High Voltage Rectifier Assem- bly, High V[...]

  • Page 4

    2 R-1480 R-1481 R-1482 MICR O W A VE MEASUREMENT PR OCEDURE A. Requirements: 1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm 2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (t[...]

  • Page 5

    3 R-1480 R-1481 R-1482 SHARP ELECTRONICS CORPORATION SHARP PLAZA, MAHWAH, NEW JERSEY 07430-2135 SER VICE MANU AL OVER THE RANGE MICROWAVE OVEN R-1480 / R-1481 / R-1482 FOREWORD This Manual has been prepared to provide Sharp Electronics Corp. Service Personnel with Operation and Service Information for the SHARP OVER THE RANGE MICROWAVE OVEN, R-1480[...]

  • Page 6

    4 R-1480 R-1481 R-1482 ITEM DESCRIPTION Power Requirements 120 Volts / 14.3 Amperes 60 Hertz Single phase, 3 wire grounded Power Output 950 watts (IEC-705 TEST PROCEDURE) Operating frequency of 2450MHz Convection Power Output 1700 watts Case Dimensions Width 29-15/16" Height 16-3/8" Depth 15- 1/4" (Not including the door handle) Cook[...]

  • Page 7

    5 R-1480 R-1481 R-1482 Electrical Requirements The oven is equipped with a 3-prong grounding plug. DO NOT UNDER ANY CIRCUMSTANCES CUT OR REMOVE THE GROUNDING PIN FROM THE PLUG. The power supply cord and plug must be connected to a separate 120 Volt AC, 60 Hz, 15 Amp. or more branch circuit, using a grounded receptacle. The receptacle should be loca[...]

  • Page 8

    6 R-1480 R-1481 R-1482 MIX CONV COOK LBS KG TURNTABLE OFF HELP CONTROL PANEL OPERA TION DESCRIPTION OF OPERATING SEQUENCE The following is a description of component functions during oven operation. OFF CONDITION Closing the door activates the door sensing switch and secondary interlock switch. (In this condition, the monitor switch contacts are op[...]

  • Page 9

    7 R-1480 R-1481 R-1482 RELAY CONNECTED COMPONENTS RY1 Oven lamp / Fan motor / Stirrer motor RY2 Power transformer RY3 Turntable motor RY4 Hood fan motor 2. 120 volts A.C. is supplied to the primary winding of the power transformer and is converted to about 3.3 volts A.C. output on the filament winding, and approximately 2000 volts A.C. on the high [...]

  • Page 10

    8 R-1480 R-1481 R-1482 2. HORIZONTAL VENTING The air handing is the same as VERTICAL VENTING except that the final air discharge is directed horizontally out from the top rear of the oven into the customer's vent system. _ : AIR FLOW 3. RE-CIRCULATION (INSIDE VENTING) The air handing is the same as VERTICAL VENTING except that the final air di[...]

  • Page 11

    9 R-1480 R-1481 R-1482 SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. COOKING TIME PROGRAMMED 3. VARIABLE COOKING CONTROL "HIGH" 4. "START" PAD TOUCHED Figure O-2. Oven Schematic-Cooking Condition Figure O-1. Oven Schematic-Off Condition SCHEMATIC NOTE: CONDITION OF OVEN 1. DOOR CLOSED 2. CLOCK APPEARS ON DISPLAY MAGNETRON [...]

  • Page 12

    10 R-1480 R-1481 R-1482 DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM The door is opened by pulling the door handle, refer to the Figure D-1. CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE TEST THE DOOR SENSING SWITCH, PRIMARY INTERLOCK RELAY (RY2), SEC- ONDARY INTERLOCK SWITCH AND MONI- TOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPT[...]

  • Page 13

    11 R-1480 R-1481 R-1482 TROUBLESHOO TING GUIDE Never touch any part in the circuit with your hand or an uninsulated tool while the power supply is connected. When troubleshooting the microwave oven, it is helpful to follow the Sequence of Operation in performing the checks. Many of the possible causes of trouble will require that a specific test be[...]

  • Page 14

    12 R-1480 R-1481 R-1482 CK = Check / RE = Replace POSSIBLE CASE AND  DEFECTIVE PARTS PROBLEM TEST PROCEDURE CONDITION OFF  CONDITION IDLE  CONDITION MICROWAVE COOKING CONDITION  Home fuse blows when power cord is plugged into wall receptacle.  Monitor fuse blows when power cord is plugged into wall receptacle.  Disp[...]

  • Page 15

    13 R-1480 R-1481 R-1482 B POWER TRANSFORMER TEST TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the[...]

  • Page 16

    14 R-1480 R-1481 R-1482 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. If the capacitor is open, no high voltage will be available to the magnetron. Disconnect input leads and check for short or open between [...]

  • Page 17

    15 R-1480 R-1481 R-1482 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Before performing this test, make sure that the secondary interlock switch and the primary interlock relay are operating properly, accord[...]

  • Page 18

    16 R-1480 R-1481 R-1482 I BLOWN MONITOR FUSE TEST TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. If the monitor fuse is blown when the door is opened, check the primary interlock relay, secondary interlock sw[...]

  • Page 19

    17 R-1480 R-1481 R-1482 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST Resistance between; BLU (1) AND YLW (4) = 0 Ω (Shorted) BLK (2) AND YLW (4) = 32 Ω BLU (1) AND BLK (2) = 32 Ω BLK (2) AND WHT (3) = 20 Ω WHT (3) AND RED (5) = 45 Ω 123 45 BLU BLK WHT YLW RED 6-PIN CONNECTOR OF HOOD FAN MOTOR 5. Reconnect all leads removed from compone[...]

  • Page 20

    18 R-1480 R-1481 R-1482 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 7) Reconnect the power supply cord after the outer case is installed. 8) Run the oven and check all functions. 2. Control Unit. The following symptoms indicate a defective control unit. Before replacing the control unit, perform the Key unit test (Procedure M) to determine if c[...]

  • Page 21

    19 R-1480 R-1481 R-1482 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 1. Disconnect the power supply cord, and then remove outer case. 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Disconnect the leads to the primary of the power transformer. 5. Ensure that these leads remain isolated from other components and oven c[...]

  • Page 22

    20 R-1480 R-1481 R-1482 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST STEPS OCCURRENCE CAUSE OR CORRECTION 1 Only pattern at "a" is broken. *Insert jumper wire J1 and solder. 2 Pattern at "a" and "b" are broken. *Insert the coil RCILF2003YAZZ between "c" and "d". 5) Make a visual inspection of the[...]

  • Page 23

    21 R-1480 R-1481 R-1482 T OUCH CONTROL P ANEL ASSEMBL Y OUTLINE OF TOUCH CONTROL PANEL 3) Synchronizing Signal Circuit The power source synchronizing signal is available in order to compose a basic standard time in the clock circuit. It incorporates a very small error because it works on commercial frequency. 4) ACL Circuit A circuit to generate a [...]

  • Page 24

    22 R-1480 R-1481 R-1482 DESCRIPTION OF LSI LSI(IZA876DR) The I/O signals of the LSI(IZA876DR) are detailed in the following table. Pin No. Signal I/O Description 1 VCC IN Connected to GND. 2 VEE IN Anode (segment) of Fluorescent Display illumination voltage: -31V. Vp voltage of power source circuit input. 3 AVSS IN Power source voltage:-5V. VC volt[...]

  • Page 25

    23 R-1480 R-1481 R-1482 22 P44 OUT Terminal not used. 23 P43 OUT Signal to sound buzzer. A: key touch sound. B: Completion sound. C: When the temperature of the oven cavity reaches the preset temperature in the preheating mode, or when the preheating hold time (30 minutes) is elapsed. 24 P42 IN Terminal not used. 25 INT1 IN Signal to synchronize LS[...]

  • Page 26

    24 R-1480 R-1481 R-1482 Pin No. Signal I/O Description ß(60Hz) GND VP 41-44 P17-P14 OUT Digit selection signal. Signal similar to P23. 45-48 P13-P10 OUT Segment data signals. The relation between signals and indicators are as follows: Signal Segment Signal Segment P13 ............... P15 P03 ................ P7 P12 ............... P14 P02 ........[...]

  • Page 27

    25 R-1480 R-1481 R-1482 1. Precautions for Handling Electronic Components This unit uses CMOS LSI in the integral part of the circuits. When handling these parts, the following precautions should be strictly followed. CMOS LSI have extremely high impedance at its input and output terminals. For this reason, it is easily influenced by the surroundin[...]

  • Page 28

    26 R-1480 R-1481 R-1482 Microwave ovens contain circuitry capable of producing very high voltage and current, contact with following parts may result in severe, possibly fatal, electric shock. (Example) High Voltage Capacitor, Power Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc.. WARNING: Avoid possible exposure [...]

  • Page 29

    27 R-1480 R-1481 R-1482 REMOVAL OF OVEN FROM WALL (Two persons recommended to remove the oven) 1. Disconnect the power supply cord, and uncoil the power supply cord. 2. Remove the turntable tray and support from the oven cavity. 3. Remove the one (1) screw holding the exhaust damper assembly to the rear stay, and remove the exhaust damper assembly [...]

  • Page 30

    28 R-1480 R-1481 R-1482 hood duct. 10.Remove the two (2) unit mounting screws from the chassis support (right side) and the hood duct (left side). 11.Remove the one (1) screw holding the chassis support. 12.Remove the chassis support. 13.Remove the hood duct from the oven cavity by lifting it up 14.Screw the oven lamp off from the lamp socket. 15.R[...]

  • Page 31

    29 R-1480 R-1481 R-1482 1. Disconnect the power supply cord, remove the oven from wall and remove outer case (Refer to procedure of "Removal of Oven from Wall" and "Outer case Removal".) 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Disconnect the wire leads from the fan motor and the chassis suppor[...]

  • Page 32

    30 R-1480 R-1481 R-1482 1. Disconnect the power supply cord. 2. Open the door and block it open. 3. Remove the three (3) screws holding the base cover to the oven cavity 4. Remove the base cover from the oven cavity by pulling REMOVAL") 4. Lift the oven lamp cover up. 5. Now, the oven lamp and the socket are found. 6. Screw the oven lamp off f[...]

  • Page 33

    31 R-1480 R-1481 R-1482 the control panel. 17.Remove the key fixing plate from the control panel. 18.Tear the key unit from the key fixing plate. 19.Now, the key unit is free NOTES FOR KEY UNIT REPLACEMENT 1. Do not reuse the torn key unit because the performance of the adhesive becomes weak. 2. Before attaching a new key unit, wipe off remaining a[...]

  • Page 34

    32 R-1480 R-1481 R-1482 1. Disconnect the power supply cord and remove the oven from wall and remove outer case. (Refer to procedure of "Removal of Oven from Wall" and "Outer case Removal") 2. Open the door and block it open. 3. Discharge high voltage capacitor. 4. Remove the control panel assembly, referring to the procedure of[...]

  • Page 35

    33 R-1480 R-1481 R-1482 latch holes correctly. 6. Re-install the door stopper to the door assembly. 7. Re-install the hood exhaust louver to the oven cavity front face plate. Note: After any service to the door; (A) Make sure that door sensing switch and secondary interlock switch are operating properly. (Refer to chapter "Test Procedures"[...]

  • Page 36

    34 R-1480 R-1481 R-1482 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H Figure S-1. Pictorial Diagram HIGH VOLTAGE RECTIFIER HIGH VOLTAGE CAPACITOR HIGH VOLTAGE WIRE A HIGH VOLTAGE COMPONENTS POWER  TRANSFORMER Power Supply cord 120V 60Hz 1 2 3 WHT GRN BLK WHT GRN BLK CAVITY THERMAL CUT-OUT MAGNETRON TEMPERATURE [...]

  • Page 37

    35 R-1480 R-1481 R-1482 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H Figure S-2. Control Panel Circuit + – + – + – + – A 7 VRS1 (J1) D20 R110 R110 47 1/2w C110 0.033 µ /250v C110 D25 D26 D27 D28 T1 D1 D1-D4 11ES1 Q20 KRA101M Q24 KRA101M R20 1k 1/2w RY4 RY5 RY1 RY2 NO NC RY3 Q25 KRA101M Q26 KRA101M Q28 KRA101M [...]

  • Page 38

    36 R-1480 R-1481 R-1482 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H Figure S-3. Printed Wiring Board DIP ,BFB 1 R10 C6 C10 R4 R1 D4 (ZD2) S1 S2 P (R2) D1 SP40 C5 C7 D25 D20 46 48 47 RY4 RY5 T1 (470V) VRS1 (CN - A) CN - A AC(N) TTM RY3 AC(H) OL MICRO FM ZD3 ZD1 ZD4 CF1 (J15) R7 R40 27 28 29 30 31 32 (J11) (J10) (R76) (R100) (D70) D71 D7[...]

  • Page 39

    37 R-1480 R-1481 R-1482 P AR TS LIST Note: The parts marked “ ∆ ” may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V. " §" MARK: PARTS DELIVERY SECTION ELECTRIC PARTS 1- 1 FH-DZB012MRY0 M High voltage rectifier assembly 1 AK 1- 2 RC-QZA173WRE0 M High voltage capacitor 1 AR 1- 3 QFS-TA013[...]

  • Page 40

    38 R-1480 R-1481 R-1482 REF. NO. PART NO. § DESCRIPTION Q'TY CODE IC1 RH-IZA876DRE0 J LSI 1 AW Q3 VSKRA101M//-3 J Transistor (KRA101M) 1 AB Q4 VSDTA123ES/-3 J Transistor (DTA123ES) 1 AA Q20 VSKRA101M//-3 J Transistor (KRA101M) 1 AB Q24-26 VSKRA101M//-3 J Transistor (KRA101M) 3 AB Q27 VSKRC243M//-3 J Transistor (KRC243M) 1 AB Q28 VSKRA101M//-3[...]

  • Page 41

    39 R-1480 R-1481 R-1482 REF. NO. PART NO. § DESCRIPTION Q'TY CODE 5-2-1 PGLSPB012MRE0 M Front door glass [R-1480] 1 AQ 5-2-1 PGLSPB014MRR0 M Front door glass [R-1481] 1 AQ 5-2-1 PGLSPB013MRR0 M Front door glass [R-1482] 1 AQ 5-2-2 LSTPPB030MRF0 M Latch head 1 AC 5-2-3 LSTPPB032MRF0 M Glass stopper 1 AC 5-2-4 MSPRTA046WRE0 M Latch spring 1 AB [...]

  • Page 42

    40 R-1480 R-1481 R-1482 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H OVEN AND CABINET PARTS 4-1 1-12 7-3 2-1 2-5 4-13 4-19 2-6 7-4 7-3 6-10 7-5 7-3 7-1 1-16 1-13 7-8 7-3 1-17 4-18 7-3 7-9 7-9 7-8 4-15 1-10 7-1 4-9 1-10 1-9 4-22 7-6 7-7 1-8 4-17 7-8 2-3 2-2 4-6 4-5 4-3 6-13 2-8 1-2 4-14 4-18 7-3 6-13 4-2 1-16 1-13 6-14 4-10 7-5 4-11 1-3 1-1[...]

  • Page 43

    41 R-1480 R-1481 R-1482 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H 6-6 6-7 6-11 6-1 5-6 5-4 5-3 4-21 5 5-1 5-2-1 5-2 5-5 5-6 5-6 6-1-1 5-2-4 5-2-2 5-2-3 6-1-2 6-1-3 6-1-7 6-1-5 6-1-6 6-1-4 3-2-2 3-2-1  3 - 3 3 - 3 3 - 3 3 - 2 3 - 1 7 - 3 3-1E DOOR PARTS CONTROL PANEL PARTS MISCELLANEOUS[...]

  • Page 44

    42 R-1480 R-1481 R-1482 6 45 1 2 3 6 45 1 2 3 A B C D E F G H A B C D E F G H PACKING AND ACCESSORIES '98 SHARP CORP. (3S2.530E) Printed in U.S.A COPYRIGHT © 1998 BY SHARP CORPORATION ALL RIGHTS RESERVED. No part of this publication may be repro- duced, stored in retrieval systems, or trans- mitted in any form or by any means, elec- tronic, m[...]