User manual LG MS-3237-BL

[. . . ] Website http://biz. lgservice. com MICROWAVE OVEN SERVICE MANUAL MODEL: MS-3237BL CAUTION BEFORE SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : MFL32514607 May, 2007 Printed in Korea SAFETY PRECAUTIONS This device is to be serviced only by properly qualified service personnel. Consult the service manual for proper service procedures to assure continued safety operation and for precautions to be taken to avoid possible exposure to excessive microwave energy. 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 loosening of hinges and latches, (5) evidence of dropping or abuse. C) Before turning on microwave power for any service test or inspection within the microwave generating compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment, integrity, and connections. [. . . ] Microwave energy must be below the limit of 5 mW/cm2. When mounting the door assembly to the oven assembly, be sure to adjust the door assembly parallel to the chassis. Also adjust so the door has no play between the inner door surface and oven frame assembly. If the door assembly is not mounted properly, microwaves may leak from the clearance between the door and the oven. HIGH VOLTAGE TRANSFORMER REMOVAL 1) Discharge the high voltage capacitor. 2) Disconnect the leadwire from magnetron, high voltage transformer, and capacitor. 3) Remove the screw holding the high voltage transformer to the baseplate. F. FAN MOTOR ASSEMBLY REMOVAL 1) Discharge the high voltage capacitor. 2) Disconnect the leadwire from fan motor, and high voltage capacitor. 3) Remove the two screws holding the the suction guide ASS'Y to the oven cavity and remove the high voltage diode earth screw. 4) Remove the two screws holding the fan motor ASS'Y to the suction guide ASS'Y. G. HIGH VOLTAGE CAPACITOR AND DIODE REMOVAL 1) Discharge the high voltage capacitor. 2) Disconnect the leadwire from fan motor, and high voltage capacitor. 3) Remove the screw holding the suction guide ASS'Y to the oven cavity and remove the high voltage diode earth screw. 4) Remove the screw holding the high voltage capacitor bracket. Fan Motor ASS Y Suction Guide H. V Capacitor Remove door assembly H. V Transformer H. V. AIR DUCT ASSEMBLY REMOVAL 1) Disconnect the leadwire from lamp. 2) Remove the mounting screw to Latch Board. J. REMOVING THE TURNTABLE MOTOR 1) Remove the turntable. 2) Remove the turntable shaft VERY CAREFULLY with a slotted screwdriver. The turntable base cover is easily removed by pinching the six parts with a wire cutting. 5) Disconnect the leadwire from the turntable motor terminals. 6) Remove the screw securing the turntable motor to the oven cavity ASS'Y 7) After repairing the motor, rotate the removed turntable motor cover. [. . . ] Replace PCB assembly. No continuity. 2. Some inputs cannot be programmed. Everything works as specified. 3. Display shows a number or figure different from one touched. Still have trouble. 4. Random programming when touching other pads. 5. [. . . ]