R-1480 R-1481 R-1482 SERVICE MANUAL S3807R1480X// OVER THE RANGE MICROWAVE OVEN MODELS 1 Coffee/tea 2 Roll/muffin, fresh 3 Roll/muffin, frozen 4 Hot cereal 5 Scrambled eggs CUSTOM HELP BREAKFAST POPCORN SNACKS & REHEAT COMPU DEFROST COMPU COOK 1 Dinner plate 2 Pasta/casserole 3 Frozen entree 4 Frozen snack 5 Pizza, slice 1 2 3 4 6 7 8 9 POWER LEVEL TURNTABLE ON/OFF WORK LIGHT KITCHEN TIMER CLOCK STOP CLEAR NIGHT LIGHT R-1480 R-1481 R-1482 1 Baked potatoes 2 Fresh vegetables 3 Frozen ve
R-1480 R-1481 R-1482 PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EXCESSIVE MICROWAVE ENERGY (a) Do not operate or allow the oven to be operated with the door open.
R-1480 R-1481 R-1482 WARNING TO SERVICE PERSONNEL Microwave ovens contain circuitry capable of producing 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 Transformer, Magnetron, High Voltage Rectifier Assembly, High Voltage Harness etc.. Read the Service Manual carefully and follow all instructions. Don't Touch ! Danger High Voltage When the testing is completed, 1.
R-1480 R-1481 R-1482 MICROWAVE MEASUREMENT PROCEDURE A. Requirements: 1) Microwave leakage limit (Power density limit): The power density of microwave radiation emitted by a microwave oven should not exceed 1mW/cm2 at any point 5cm or more from the external surface of the oven, measured prior to acquisition by a purchaser, and thereafter (through the useful life of the oven), 5 mW/cm2 at any point 5cm or more from the external surface of the oven.
R-1480 R-1481 R-1482 SERVICE MANUAL PRODUCT DESCRIPTION OVER THE RANGE MICROWAVE OVEN R-1480 / R-1481 / R-1482 GENERAL INFORMATION 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, R-1481, R-1482. It is recommended that service personnel carefully study the entire text of this manual so that they will be qualified to render satisfactory customer service.
R-1480 R-1481 R-1482 PRODUCT SPECIFICATION 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 1700 watts Width 29-15/16" Height 16-3/8" Depth 15- 1/4" (Not including the door handle) Width 20-1/4" Height 8-3/16" Depth 14-1/2" 2 bulbs, 30W x 2, Incandescent light bulbs Approx. 300 C.F.M. Convection Power Output Case Dimensions Cooking Cavity Dimensions 1.
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 located inside the cabinet directly above the Microwave Oven/Hood system mounting location.
R-1480 R-1481 R-1482 CONTROL PANEL MIX CONV COOK LBS KG TURNTABLE OFF HELP CUSTOM HELP BREAKFAST 1 Coffee/tea 2 Roll/muffin, fresh 3 Roll/muffin, frozen 4 Hot cereal 5 Scrambled eggs POPCORN SNACKS & REHEAT 1 Dinner plate 2 Pasta/casserole 3 Frozen entree 4 Frozen snack 5 Pizza, slice COMPU COOK 1 Baked potatoes 2 Fresh vegetables 3 Frozen vegetables 4 Rice 5 Ground meat COMPU DEFROST 1 2 3 4 5 6 7 8 9 0 POWER LEVEL KITCHEN TIMER CLOCK MINUTE PLUS TURNTABLE ON/OFF STOP CLEAR START
R-1480 R-1481 R-1482 RELAY RY1 RY2 RY3 RY4 CONNECTED COMPONENTS Oven lamp / Fan motor / Stirrer motor Power transformer Turntable motor Hood fan motor VARI-MODE ON TIME Power 10(P-HI) 32 sec. (100% power) Power 9(P-90) 30 sec. (approx. 90% power) Power 8(P-80) 26 sec. (approx. 80% power) Power 7(P-70) 24 sec. (approx. 70% power) Power 6(P-60) 22 sec. (approx. 60% power) Power 5(P-50) 18 sec. (approx. 50% power) Power 4(P-40) 16 sec. (approx. 40% power) Power 3(P-30) 12 sec. (approx.
R-1480 R-1481 R-1482 VENTILATION METHODS HOT AIR EXHAUST 1. VERTICAL VENTING For this venting method, hot air rising from the conventional range below is drawn in by the hood fan motor through the grease filters at the right and left sides of the base cover, up through the right and left sides of the oven cavity, then discharged vertically at rear center top of the oven, into the customer's vent system. _: AIR FLOW TO DUCT TO DUCT HOOD FAN MOTOR HOOD INTAKE DUCT GREASE FILTER 2.
R-1480 R-1481 R-1482 MAGNETRON TEMPERATURE FUSE CONTROL UNIT COM. N.O. RY4 RY5 High N.C. GRN B1 Low HOOD CAPACITOR 120 V AC. GND 60 Hz E2 RY3 A3 B9 A7 HL FM DOOR SENSING SWITCH RY2 N.O. TTM HOOD LAMP HL RY1 A5 FAN MOTOR A1 TURNTABLE MOTOR HOOD MOTOR WHT POWER TRANSFORMER E1 HIGH VOLTAGE CAPACITOR 0.94µF COM.
R-1480 R-1481 R-1482 DESCRIPTION AND FUNCTION OF COMPONENTS DOOR OPEN MECHANISM CAUTION: BEFORE REPLACING A BLOWN MONITOR FUSE TEST THE DOOR SENSING SWITCH, PRIMARY INTERLOCK RELAY (RY2), SECONDARY INTERLOCK SWITCH AND MONITOR SWITCH FOR PROPER OPERATION. (REFER TO CHAPTER "TEST PROCEDURE"). NOTE: MONITOR FUSE AND SWITCH ARE REPLACED AS AN ASSEMBLY The door is opened by pulling the door handle, refer to the Figure D-1.
R-1480 R-1481 R-1482 HOOD LAMP This air is then expelled either vertically or horizontally through the customer supplied duct system, or discharged back into the kitchen. The hood lamps are mounted at the hood lamp angle on the base cover. The hood lamps can be turned off and on by touching the WORK LIGHT pad or the NIGHT LIGHT pad. And also the brightness can be varied to high or low by touching the WORK LIGHT pad or the NIGHT LIGHT pad.
12 MICROWAVE COOKING CONDITION IDLE CONDITION Home fuse blows when power cord is plugged into wall receptacle. Monitor fuse blows when power cord is plugged into wall receptacle. Display does not illuminate when power cord is first plugged into wall receptacle. Display does not operate properly when STOP/CLEAR key is touched. (The time of day should appear on the display with beep sound during normal condition.) Oven lamp does not light with door is opened.
R-1480 R-1481 R-1482 TEST PROCEDURES PROCEDURE LETTER A COMPONENT TEST MAGNETRON ASSEMBLY TEST 1. 2. 3. 4. 5. 6. 7. 8. 9. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check across the magnetron filament leads should indicate less than 1 ohm.
R-1480 R-1481 R-1482 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST (HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO MEASURE THE FILAMENT AND HIGH VOLTAGE.) C HIGH VOLTAGE RECTIFIER TEST 1. 2. 3. 4. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. Isolate the rectifier from the circuit.
R-1480 R-1481 R-1482 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 6. Reinstall the outer case (cabinet). 7. Reconnect the power supply cord after the outer case is installed. 8. Run the oven and check all functions. CAUTION: IF THE THERMAL CUT-OUT OR TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE THERMAL CUT-OUT OR TEMPERATURE FUSE. F SECONDARY INTERLOCK SWITCH TEST 1. 2. 3. 4. 5. 6. 7. 8. G Disconnect the power supply cord, and then remove outer case.
R-1480 R-1481 R-1482 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST 5. 6. 7. 8. with the door opened (in this condition the plunger of the monitor switch is pushed in), the meter should indicate an open circuit. If improper operation is indicated, the switch may be defective. After testing the monitor switch, reconnect the wire lead to the monitor switch (COM) terminal and check the continuity of the monitor circuit. Reconnect all leads removed from components during testing.
R-1480 R-1481 R-1482 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST YLW 4 1 HOOD FAN CAPACITOR 32 Ω 5 Resistance between; BLU 45 Ω 20 Ω BLU (1) BLK (2) BLU (1) BLK (2) WHT (3) AND AND AND AND AND YLW (4) = YLW (4) = BLK (2) = WHT (3) = RED (5) = BLU BLK WHT 1 2 3 2 BLK RED 3 0Ω (Shorted) 32Ω 32Ω 20Ω 45Ω 6-PIN CONNECTOR OF HOOD FAN MOTOR WHT 5. 6. 7. 8. L Reconnect all leads removed from components during testing. Reinstall the outer case (cabinet).
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 control unit is faulty. 2-1 In connection with pads. a) When touching the pads, a certain group of pads do not produce a signal.
R-1480 R-1481 R-1482 TEST PROCEDURES PROCEDURE LETTER N COMPONENT TEST RELAY TEST 1. 2. 3. 4. 5. Disconnect the power supply cord, and then remove outer case. Open the door and block it open. Discharge high voltage capacitor. Disconnect the leads to the primary of the power transformer. Ensure that these leads remain isolated from other components and oven chassis by using insulation tape. 6. After that procedure, re-connect the power supply cord. 7.
R-1480 R-1481 R-1482 TEST PROCEDURES PROCEDURE LETTER COMPONENT TEST STEPS 1 2 OCCURRENCE CAUSE OR CORRECTION Only pattern at "a" is broken. Pattern at "a" and "b" are broken. B Q27 2 AC(H) C100 (470V) VRS1 b RY3 1 T1 d D20 a (J1) 5) Make a visual inspection of the varistor. Check for burned damage and examine the transformer with a tester for the presence of layer short-circuit (check the primary coil resistance which is approximately 192Ω ± 15%).
R-1480 R-1481 R-1482 TOUCH CONTROL PANEL ASSEMBLY 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. The touch control section consists of the following units as shown in the touch control panel circuit.
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 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 voltage of power source circuit input. 4 VREF IN 5-6 AN7-AN6 IN Reference voltage input terminal. A reference voltage applied to the A/D converter in the LSI.
R-1480 R-1481 R-1482 Pin No. Signal I/O Description 22 P44 OUT Terminal not used. 23 P43 OUT Signal to sound buzzer. A: key touch sound. 24 P42 IN 25 INT1 IN 0.1 sec A 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. Terminal not used. 2 sec B 1 sec 1 sec H: GND C L Signal to synchronize LSI with commercial power source frequency.
R-1480 R-1481 R-1482 Pin No. Signal I/O Description 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 P13 ............... P15 P12 ............... P14 P11 ............... P13 P10 ............... P12 P07 ............... P11 P06 ............... P10 P05 ................. P9 P04 ................. P8 (ß : INTO signal) Signal Segment P03 ................ P7 P02 ...........
R-1480 R-1481 R-1482 SERVICING 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 surrounding high voltage power source, static electricity charge in clothes, etc, and sometimes it is not fully protected by the built-in protection circuit.
R-1480 R-1481 R-1482 COMPONENT REPLACEMENT AND ADJUSTMENT PROCEDURE WARNING AGAINST HIGH VOLTAGE: 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 to microwave energy. Please follow the instructions below before operating the oven.
R-1480 R-1481 R-1482 4. Pull the hood exhaust louver from the oven cavity by pushing the right and left tabs of the hood exhaust louver to remove. 5. Now, the hood exhaust louver is free. 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.
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.Remove the lamp socket from the lamp angle. 16.
R-1480 R-1481 R-1482 NOTE: When the tab is broken or turned off, use the another tab which is fixed near the slit when the new thermal cut-out is replaced. 3. Discharge high voltage capacitor. 4. Remove two (2) unit mounting screws. 5. Remove the hood duct. (Refer to the procedure of " HOOD FAN MOTOR, HOOD DUCT AND OVEN LAMP SOCKET REMOVAL". 6. Straighten the tab holding the thermal cut-out to the top plate of the oven cavity. 7 .
R-1480 R-1481 R-1482 6. Install the hood duct to the oven cavity with the one (1) screw. 7. Re-install the wire leads to the hole of the hood duct. 8. Connect the wire leads to the fan motor and chassis support, referring to the pictorial diagram. 9. Refer to procedure of "OUTER CASE REMOVAL". And reverse their procedure. And re-install the outer case. Shaft Table Center of bracket TURNTABLE MOTOR REMOVAL 1. Disconnect the power supply cord. 2. Open the door and block it open. 3.
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 4. 5. 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 adhesive on the key fixing plate surfaces completely with a soft cloth soaked in alcohol. 3.
R-1480 R-1481 R-1482 switch is in the lower position, door sensing switch is in the upper position and the monitor switch is in the middle position. 2. Re-connect wire leads to each switch. Refer to pictorial diagram. 3. Secure the latch hook (with two (2) mounting screws) to oven cavity front flange. 4. Make sure that the monitor switch is operating properly and check continuity of the monitor circuit. Refer to chapter "Test Procedure" and "Adjustment procedure".
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".) (B) An approved microwave survey meter should be used to assure compliance with proper microwave radiation emission limitation standards.
1 2 1 3 34 N.O. COM. N.O. COM. RY1 CN-A 75 31 C100 4 RED 5 to Right Base Plate ORG ORG RED BLK RED ORG N.C. SECONDARY INTERLOCK SWITCH COM. MONITOR SWITCH BLK N.O. COM.
MICRO FAN MOTOR OVEN LAMP STIRRER MOTOR COM(H) LOW HOOD MOTOR HIGH HOOD THERMO COM HOOD LAMP TURNTABLE MOTOR MOTOR RUN CAPACITOR B9 A5 A3 COM N.O. N.O. COM B1 B3 B5 B7 NO 3 13 RY2 RY1 NC RY5 RY4 S101D01 2 VRS1 11 SSR1 RY3 D20 R20 1k 1/2w C1 0.1µ/50v C2 1000µ/35v + – 5 D30 SP40 E1 Q30 KRA101M + – R40 3.3k ZD3 HZ5C2 Q40 KRA101M C8 Q3 KRA101M C7 VC (J15) (J3) CF1 CST4.
R-1480 R-1481 R-1482 1 2 4 3 6 5 A A DIP B B 1 1 33 C C 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 ,BFB D77 E (J15) C6 C8 R8 B Q20 35 36 37 BQ30 38 ZD3 R4 E Q4 E B SP40 B Q40 E Q28 C3 R1 C2 E D3 F D2 D25 C1 B Q3 7 C9 (R2) (ZD2) 45 C4 9 46 5 RY4 3 4 47 1 (CN - B) CN - B 48 RY5 C20 E D26 1 HOOD COM HOOD HOOD HOOD LAMP THERM MHIGH MLOW R110 D4 D1 44 9 R3 B (Q1) C110 ZD1 R40 43 42 41 CN - E 2 (J14) S2 RY3 1
R-1480 R-1481 R-1482 PARTS LIST Note: The parts marked “∆” may cause undue microwave exposure. The parts marked “*” are used in voltage more than 250V. REF. NO. "§" MARK: PARTS DELIVERY SECTION PART NO.
R-1480 R-1481 R-1482 REF. NO. IC1 Q3 Q4 Q20 Q24-26 Q27 Q28 Q30 R1 R2 R3 R4 R7-8 R10 R20 R30 R31 R40 R70-73 R77-83 R91-93 R110 RY1-2 RY3-4 RY5 SSR1 SP40 T1 VRS1 ZD1 ZD3 ZD4 3- 2 3- 2 3- 2 3- 2-1 3- 2-1 3- 2-1 3- 2-2 3- 3 PART NO.
R-1480 R-1481 R-1482 ∆ ∆ ∆ ∆ REF. NO. 5-2-1 5-2-1 5-2-1 5-2-2 5-2-3 5-2-4 5- 3 5- 4 5- 5 5- 5 5- 5 5- 6 PART NO.
R-1480 R-1481 R-1482 2 1 4 3 6 5 7-3 4-1 OVEN AND CABINET PARTS 7-3 A 1-14 4-13 A 2-1 7-5 4-19 7-3 4-10 2-5 B B 7-3 4-12 4-11 1-3 7-4 1-12 2-6 7-5 1-15 C 7-1 C 1-16 1-13 1-17 4-18 7-8 1-5 7-3 1-3 6-10 7-3 D D 7-9 4-7 4-18 6-12 4-16 E 4-20 2-2 4-9 6-9 4-6 1-10 7-6 7-9 1-9 6-8 4-8 4-5 E 7-3 1-8 4-22 1-4 6-8 F 6-14 1-11 7-7 7-3 7-8 4-14 1-2 4-17 7-8 1-10 4-4 F 7-1 1-7 4-3 7-8 6-13 1-1 1-6 4-15 2-8 G G 7-3 2-3 2-4 4-2 7-3 1-13 6-13 2-
R-1480 R-1481 R-1482 2 1 4 3 6 5 CONTROL PANEL PARTS 3-3 3-2 A A 3-1E 3-2-2 3-1 3-2-1 B 3-3 7-3 B DOOR PARTS 3-3 5 4-21 5-4 5-6 5-1 C C 5-6 5-2-1 5-3 D D 5-6 5-2-3 E E 5-2 5-2-2 5-5 MISCELLANEOUS 5-2-4 6-1 6-1-1 F F 6-1-4 6-1-5 6-7 6-1-2 6-6 6-1-6 6-1-7 6-1-3 G G 6-11 H H 1 2 4 3 41 5 6
R-1480 R-1481 R-1482 2 1 4 3 6 5 PACKING AND ACCESSORIES A A TOP PAD SPADBB026MRE0 DOOR PROTECTOR SPADP0221MRE0 B B TRAY PACK SPADPB037MRE0 4-3 TURNTABLE TRAY C 6-1 INSTALL MATERIAL ASSEMBLY C WRAP COVER SSAKH0103MRE0 6-3 OPERATION MANUAL D 6-5 WALL TEMPLATE D 6-2 INSTALLATION INSTRUCTION E 6-4 TOP TEMPLATE E 6-13 GREASE FILTER (x 2) BOTTOM PAD SPADBB025MRE0 F F Non-replaceable items G G H H PACKING CASE 1 2 4 3 5 6 COPYRIGHT © 1998 BY SHARP CORPORATION ALL RIGHTS RESERVED
