Summary of the content on the page No. 1
MODEL 721.66339
DIVISION 20
BASIC FIELD MANUAL
FOR
MICROWAVE OVEN
MODEL 721.66339800
February, 2008
Summary of the content on the page No. 2
CAUTION WARNING TO SERVICE TECHNICIANS 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
Summary of the content on the page No. 3
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 721.66339 MECHANICAL SERVICE INFORMATION TABLE OF CONTENTS 1. Adjustment Procedures -------------------------------------------------------------------------------------------------------------------------------------- 3 2. Precautions on Installation ------------------------------------------
Summary of the content on the page No. 4
ADJUST THE LATCH AND SWITCH CLOSING 1. ADJUSTMENT PROCEDURES To avoid possible exposure to microwave energy (3) Loosen the two screws holding the plastic latch board as leakage, adjust the door latches and interlock switches, shown. using the following procedure. (4) With the oven door closed tightly, move the latch board ONLY AUTHORIZED SERVICE PERSONNEL upward toward the top of the oven and/or away from the SHOULD MAKE THIS ADJUSTMENT. door latch until the gaps are less than 1/64” (0.5 mm). T
Summary of the content on the page No. 5
LATCH BOARD SECONDARY DOOR LATCH INTERLOCK SWITCH A MONITOR INTERLOCK SWITCH PRIMARY INTERLOCK DOOR LATCH SWITCH Figure 1-a LATCH 0-1/64" LATCH BOARD 0-1/64" Figure 1-b -4-
Summary of the content on the page No. 6
2. PRECAUTIONS ON INSTALLATION 4. TRIAL OPERATION (Figure 2) After installation, the following sequences and results A. Plug the power supply cord into a 120 V AC, 60 Hz, should be checked carefully. single-phase power source with a capacity of at least 20 A. Put a container filled with water (about 1 liter) into the amperes. oven, and close the door tightly. B. Since the unit weights about 36.5 lbs, be sure to place it B. Touch the STOP/CLEAR and the COOK TIME keys. on a sturdy and flat s
Summary of the content on the page No. 7
SPECIFICATIONS Rated Power Consumption ..........................................1650W maximum Output ..........................................................................1200W maximum (*IEC 60705 Rating standard) ...................................................................Adjustable 100W through 1200W, 11 steps Frequency ....................................................................2,450 MHz ± 50 MHz Power Supply ..............................................................
Summary of the content on the page No. 8
6. OVERALL CIRCUIT DIAGRAM A. SCHEMATIC DIAGRAM -7- IMPORTANT SAFETY NOTE: THE SHADED AREAS ON THIS SCHEMATIC DIAGRAM INCORPORATE SPECIAL FEATURES IMPORTANT FOR PROTECTION FROM MICROWAVE RADIATION, FIRE, ELECTRICAL SHOCK, AND HAZARDS. WHEN SERVICING IT IS ESSENTIAL THAT ONLY MANUFACTURER S SPECIFIED PARTS BE USED FOR THE CRITICAL COMPONENTS IN THE SHADED AREAS OF THE SCHEMATIC DIAG
Summary of the content on the page No. 9
B. MATRIX CIRCUIT FOR TOUCH KEY BOARD Figure 4 -8-
Summary of the content on the page No. 10
7. OPERATING PROCEDURES A. OVEN CONTROL PANEL 1. DISPLAY. The display includes a clock and indicators that tell you time of day, cooking time settings, and cooking functions selected. 2. QUICK TOUCH SENSOR. This pad allows you to cook most of your favorite foods without having to select cooking times and power levels. 3. MORE / LESS. All of the one touch cook and Timed Cook can be adjusted to cook food for a longer or shorter time. MORE Press MORE will add 10 seconds to the cooking time. L
Summary of the content on the page No. 11
(6) TIMED COOKING B. EASY USE TABLE 1. Touch STOP/CLEAR. 2. Touch COOK TIME. (1) KITCHEN TIMER 3. Touch number for cooking time. 1. Touch STOP/CLEAR. 4. Touch POWER. 2. Touch KITCHEN TIMER. 5. Touch number for cooking power level. 3. Touch correct number for time. 6. Touch START. 4. Touch START. (7) MULTI-STAGE COOKING (2) CHILD LOCK 1. Touch STOP/CLEAR. To set: 2. Touch COOK TIME. 1. Touch STOP/CLEAR. 3. Touch number for cooking time. 2. Touch “START” more than 4 seconds. 4. Touch POWER. To
Summary of the content on the page No. 12
8. PROCEDURE FOR MEASURING MICROWAVE ENERGY LEAKAGE B. MEASURING MICROWAVE ENERGY LEAKAGE A. CAUTIONS (1) Pour 275±15cc of 20±5°C water in a beaker which is (1) Be sure to check a microwave emission prior to servicing graduated to 600 cc, and place the beaker in the center the oven if the oven is operative prior to servicing. of the oven. (2) The service personnel should inform the manufacturer, (2) Set the energy leakage monitor to 2,450 MHz and use it importer, or assembler of any certif
Summary of the content on the page No. 13
D. MEASUREMENT WITH A FULLY ASSEMBLED OVEN G. POWER OUTPUT MEASUREMENT (1) Fill the test beaker with 59 ˚F(15 ˚C) ~ 75 ˚F(24 ˚C) 1 liter tap (1) After all components, including the outer panels, are water. fully assembled, measure for microwave energy (2) Stir the water in the beaker with thermometer ( ˚F or ˚C) and leakage around the door viewing window, the exhaust measure temperature as T1. opening and air inlet openings. (3) Place the beaker on the center of turntable. (2) Microwave energ
Summary of the content on the page No. 14
9. DISASSEMBLY INSTRUCTIONS (6) Pull down and remove the circuit board from the control IMPORTANT NOTES: panel. UNIT MUST BE DISCONNECTED FROM ELECTRICAL (7) Remove the F.P.C connector from the terminal socket. OUTLET WHEN MAKING REPAIRS, RE-PLACEMENTS, ADJUSTMENTS AND CONTINUITY CHECKS. WAIT AT Remove screw LEAST ONE MINUTE, UNTIL THE HIGH VOLTAGE CAPACITOR IN THE HIGH VOLTAGE POWER ground screw SUPPLY HAS FULLY DISCHARGED. THE CAPACITOR SHOULD BE DISCHARGED BY USING INSULATED securing WIR
Summary of the content on the page No. 15
C. DOOR ASSEMBLY / REMOVAL Remove choke cover (1) Open the door. (2) Remove the choke cover very carefully with a flat-blade screwdriver. CAUTION : Be careful not to damage door seal plate by screwdriver. (3) Lift up and push the door. NOTE: 1. After replacing the door, be sure to check that the primary switch, monitor switch, and secondary switch operate normally. 2. After replacing the door, check for microwave energy leakage with a survey meter. Microwave energy must be below the limit of
Summary of the content on the page No. 16
D. MAGNETRON REMOVAL E. REMOVING THE TURNTABLE MOTOR 1) Remove the turntable and rotating ring. (1) Disconnect the wire lead from the magnetron. 2) Lay the unit down on its back. (2) Carefully remove the mounting screws holding the 3) Remove the turntable motor cover. magnetron and the waveguide. The turntable base cover is easily removed by pinching (3) Remove the magnetron assembly until the tube is clear the eight parts with a wire cutting. from the waveguide. 4) Disconnect the leadwire from
Summary of the content on the page No. 17
F. HIGH VOLTAGE TRANSFORMER REMOVAL I. REMOVING SENSOR 1) Discharge the high voltage capacitor. 1) Disconnect the leadwire from PCB Assembly. 2) Disconnect the leadwire from magnetron, high voltage 2) Remove a screw securing the sensor duct. transformer, and capacitor. 3) Remove the screw holding the high voltage transformer to the baseplate. G. FAN MOTOR ASSEMBLY / REMOVAL 1) Discharge the high voltage capacitor. 2) Disconnect the leadwire from fan motor and high voltage capacitor. 3) Remove t
Summary of the content on the page No. 18
J. INTERLOCK SYSTEM 1) INTERLOCK MECHANISM The door lock mechanism is a device which has been specially designed to eliminate microwave activity when the door is opened during cooking and thus to prevent the danger resulting from the microwave leakage. 2) MOUNTING OF THE PRIMARY/MONITOR/ SECONDARY SWITCHES TO THE LATCH BOARD 3) INSTALLATION AND ADJUSTMENT OF THE LATCH BOARD TO THE OVEN ASSEMBLY • Mount the latch board to the oven assembly. • Adjust the latch board in the arrow direction so that
Summary of the content on the page No. 19
10. INTERLOCK CONTINUITY TEST WARNING : FOR CONTINUED PROTECTION AGAINST EXCESSIVE RADIATION EMISSION, REPLACE ONLY WITH IDENTICAL REPLACEMENT PARTS. TYPE NO. SZM-V 16-FA-63 OR VP-533A-OF OR V-5230Q FOR PRIMARY SWITCH TYPE NO. SZM-V 16-FA-62, VP-532A-OF OR V-5220Q FOR MONITOR SWITCH TYPE NO. SZM-V 15-FA-63, VP-533A-OFF OR SECONDARY SWITCH A. PRIMARY INTERLOCK SWITCH TEST B. SECONDARY INTERLOCK SWITCH TEST When the door release button is depressed slowly with Disconnect the wire lead from the
Summary of the content on the page No. 20
11. TEST AND CHECKOUT PROCEDURES, AND TROUBLESHOOTING CAUTIONS 1. DISCONNECT THE POWER SUPPLY CORD FROM THE OUTLET WHENEVER REMOVING THE OUTER CASE FROM THE UNIT. PROCEED WITH THE TEST ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. 2. ALL OPERATIONAL CHECKS WITH MICROWAVE ENERGY MUST BE DONE WITH A LOAD (1 LITER OF WATER IN CONTAINER) IN THE OVEN. A. TEST PROCEDURES COMPONENTS TEST PROCEDURE RESULTS HIGH
