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MODEL 721.62642 / 721.80592
721.62649 / 721.80599
721.62644 / 721.80594
721.62643 / 721.80593
DIVISION 22
BASIC FIELD MANUAL
FOR
MICROWAVE OVEN
MODEL 721.62642400 / 721.80592401 / 721.80592402
721.62649400 / 721.80599401 / 721.80599402
721.62644400 / 721.80594401 / 721.80594402
721.62643400 / 721.80593401 / 721.80593402
March, 2005
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CAUTION SAFETY PRECAUTIONS 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. b. Make the following safety checks on all ovens to be serviced before activating the magnetron or other microwave source, and make repairs as necessary; (1) Interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other damage), (4) damage to or loose
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FOREWORD Read this Manual carefully. Failure to adhere to or observe the information in this Manual may result in exposing yourself to the Microwave Energy normally contained within the oven cavity. MODEL 721.62642 / 721.80592 721.62649 / 721.80599 721.62644 / 721.80594 721.62643 / 721.80593 TABLE OF CONTENTS (Page) SAFETY PRECAUTIONS ---------------------------------------------------------------------------------------------------- Inside front page SPECIFICATIONS ----------------------------
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SPECIFICATIONS Rated Power Consumption ---------------------------------- 1500W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output ------------------------------------------------ 1000W (IEC60705) Adjustable 100W through 1000W, 10 steps Frequency ---------------------------------------------------------2450 MHz ± 50 MHz --------------------------------------------------- 120 VAC, 60 Hz Power Supply Rated Current --------------------------------------------------- 14 Amp.
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CAUTIONS Unlike other appliances, the microwave oven is MICROWAVE RADIATION high-voltage and high-current equipment. Personnel should not be exposed to the Though it is free from danger in ordinary use, microwave energy which may radiate from the extreme care should be taken during repair. magnetron or other microwave generating device if it is improperly used or connection. • DO NOT operate on a 2-wire extension cord during All input and output microwave connections, repair and use. waveguide,
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INSTALLATIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. PRECAUTIONS ON INSTALLATION A. Plug the power supply cord into a 120V AC, 60Hz, single-phase power source with a capacity of 15A or 20A. B. Avoid placing the unit in a location where there is direct heat or splashing water. C. Install the unit on the mounting plate firmly. D. Place the unit as far away as possible from TV, radio, etc. to prevent interference. GROUNDING INSTRUCTIONS For personal safety, this
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OPERATING INSTRUCTIONS CONTROL PANEL 1 4 2 5 3 7 6 8 10 9 13 14 11 12 16 17 15 18 20 19 21 22 23 25 24 28 29 26 27 4-1
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CONTROL PANEL INSTRUCTIONS 1. Display. The display includes a clock and indicators to 16. Express Defrost. Touch this pad to express defrost. tell you time of day, cooking time settings, cook powers, “GROUND BEEF 1.0 LBS TOUCH START” will quantities, weights and cooking functions selected. appear in the display. 2. Dinner Plate. Touch this pad to cook without entering a 17. Add Minute. Touch this pad to cook for 1 minute at cook time or power. 100% cook power, or to add extra minutes at the set
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OVERALL CIRCUIT DIAGRAM SCHEMATIC DIAGRAM (I) *Check the Model No. 5-1
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SCHEMATIC DIAGRAM (II) *Check the Model No. (ADD Noise filter) RY1 O.L RY11 V.M RY14 C.L HIGH RY15 C.L NIGHT RY6 T.M 5-2
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MATRIX CIRCUIT FOR TOUCH KEY BOARD 5-3
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GENERAL INFORMATION FOR SERVICE GENERAL PRECAUTIONS IN USE FEATURES AND SPECIFICATIONS FEATURES A. Never operate the unit when it is empty. Operating the oven with no load may shorten the A. The safety systems incorporated in this model are: life of the magnetron. Whenever cooking dry foods (1) Primary interlock switch (dried fish, bread, etc.) or a small amount of food, (2) Secondary interlock switch be sure to put a glass of water into the cooking (3) Interlock monitor switch compartment. The
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SERVICE INFORMATION PRECAUTIONS AND REPAIR SERVICE TIPS PRELIMINARY (3) Do not operate the unit until it is completely A. SINCE NEARLY 2,100 VOLTS EXISTS IN SOME repaired, if any of the following conditions exist. CIRCUITS OF THIS UNIT REPAIRS SHOULD BE The unit must not be operated. CARRIED OUT WITH GREAT CARE. (a) The door does not close firmly. The filament leads of magnetron carry High (b) The hinge is broken. Voltage with respect to ground. Extreme caution (c) The door seal is damaged. must
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MICROWAVE LEAKAGE TEST CAUTIONS MEASURING MICROWAVE ENERGY LEAKAGE • Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to • Pour 275±15cc of 20±5°C(68±9°F) water in a beaker servicing. which is graduated to 600 cc, and place the beaker • The service personnel should inform the on the center of the turntable. manufacture importer, or assembler of any certified • Set the energy leakage monitor to 2,450 MHz and oven unit found to have a microwave emission
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MEASUREMENT WITH THE OUTER CASE NOTE WHEN MEASURING (1) Do not exceed meter full scale deflection. REMOVED (2) The test probe must be removed no faster than (1) When you replace the magnetron, measure for 1 inch/sec (2.5cm/sec) along the shaded area, microwave energy leakage before the outer case otherwise a false reading may result. is installed and after all necessary components (3) The test probe must be held with the grip portion are replaced or adjusted. Special care should be of the handle
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DISASSEMBLY INSTRUCTIONS (4) Remove 3 screws securing the circuit board. IMPORTANT NOTES: UNIT MUST BE DISCONNECTED FROM ELEC- TRICAL OUTLET WHEN MAKING REPAIRS, RE- PLACEMENTS, ADJUSTMENTS AND CONTIN- UITY CHECKS. WAIT AT LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER SUPPLY HAS FULLY DISCHARGED. THE CAPACITOR SHOULD BE DISCHARGED BY USING INSULATED WIRE - I.E. TEST PROBE CONNECTED TO 10K-OHM RESISTOR IN SERIES TO GROUND. WHEN RECONNECTING THE WIRE LEADS TO ANY PAR
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HOW TO REMOVE THE F.P.C. CONNECTOR HOW TO INSERT THE F.P.C. CONNECTOR Follow the steps below as illustrated in Figures 4 Follow the steps below as illustrated in Figures 6 and 5 to remove the F.P.C. connector. and 7 to insert the F.P.C. connector. (1) Hold the edges of the plastic fastener with (1) Insert the F.P.C. connector into the terminal thumb and forefinger. socket securely with the fingers. (Figure 4) (2) Hold the plastic fastener with thumb and (2) Lift up the lever of the plastic fast
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B. REMOVING THE OUT CASE(Figure 8) (1) Remove the vent grille by removing two screws securing it to the out case. (2) Remove two screws securing it to the front bracket. (3) Remove two screws securing it to the air duct. (4) Remove the mounting plate by turning the two screws securing it to the out case. (5) Remove the base plate by removing four screws securing it to the out case. Remove the Mount, All from the out case by removing two screws securing it to the out case. (6) Remove four screws
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C. REMOVING THE DOOR INTERLOCK SWITCHES (Figures 9,10) (1) Disconnect the wire leads from the interlock switches. (2) Remove two screws securing the Latch Board. (3) Make necessary replacements and check microwave energy leakage according to Latch Board “ADJUSTMENT PROCEDURE” on page 7-12. Secondary Interlock Switch Interlock Monitor Switch Primary Interlock Switch Figure 10 Figure 9 7-7
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NOTES: D. REMOVING MAGNETRON • When removing the magnetron, make sure that its (Figures 11 Through 13) dome does not hit any adjacent parts, or it may be (1) Remove the vent grille. damaged. (2) Remove mount, all. (3) Remove outcase. • When replacing the magnetron, be sure to install (4) Disconnect the wireleads. the magnetron gasket in the correct position and be (5) Remove the three screws and Magnetron very sure that the gasket is in good condition. carefully. • After replacing the magnetron,
