Goldstar MV-1304W Service Manual
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CONTROL PANEL 4-1 OPERATING INSTRUCTIONS 2 3 12 16 7 5 4 8 13 14 15 17 6 10 11 9 19 20 18 Vent On/Off Light On/Off Custom Set One Touch Control Potato BeveragePopcorn Frozen Entree Fresh Vegetable Auto Defrost Time 0 Power Stop/ Clear Start 789 456 123 Ez On Clock Timer More Less 1
Goldstar MV-1304W, 7-13 A. PRIMARY INTERLOCK SWITCH TEST When the door is opened slowly, an audible click should be heard at the same time or successively at intervals and the latches should activate the switches with an audible click. If the latches do not activate the switches when the door is closed, the switches should be a adjusted in accordance with the adjustment procedure. Disconnect the wire lead from the primary switch. Connect the ohmmeter leads to the common (COM) and normally open (NO) terminal of the switch. The meter should indicate an open circuit in the door open condition. When the door
Goldstar MV-1304W, G. ASSEMBLING DOOR (1) 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. H. REMOVING THE VENTILATION FAN ASS'Y (1) Remove the vent grille from the front of the oven. (2) Remove the mounting plate by removing two mounting rods securing itself to the unit. (See Figure 15) (3) Remove the two screws securing the mount-all and one screw securing the ventilation fan ASS'Y. (See Figure 16) Flat
7-22 Unit does not heat up even if display counts down when START key is touched for “HIGH POWER” cooking. Check: 1. PRIMARY AND SECONDARY INTERLOCK SWITCHES 2. THERMOSTAT Runs Runs Runs Contact OK Resistance incorrect Check the continuity of H.V.C. (see page 7-16) Normal H.V.T. Resistance incorrect Normal H.V.C. Abnormal Replace H.V.D. Normal Magnetron Replace Magnetron Norma
Goldstar MV-1304W, 7-14 - CAUTIONS - - DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHENEVER REMOVINGING THE CABINET FROM THE UNIT. PROCEED WITH THE TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE WIRE LEADS FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER. (SEE Figure 21) - 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 PROCEDURES RESULTS MAGNETRON (Wire leads are removed) HIGH-VOLTAGE TRANSFORMER (Wire leads are removed) 1) Measure the resistance: Across the filament terminals of the magnetron with an o
Goldstar MV-1304W, 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 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
Goldstar MV-1304W, D. REMOVING MAGNETRON (Figures 11 Through 12) (1) Disconnect the power supply cord from the wall outlet. (2) Remove the vent grille and the out case from unit. (See page 7-6) (3) Remove the wires from the filament terminals of the magnetron. (4) Remove two or four tap tite screws securing the magnetron to the wave guide.(Figure 12) (5) Lift up the magnetron slightly and pull it to the right very carefully. NOTES: • When removing the magnetron, make sure that its dome does not hit any adjacent parts, or it may be damaged. • When replacing the magnetron, be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good condi
Goldstar MV-1304W, 7-11 ADJUSTMENT PROCEDURES To avoid possible exposure to microwave energy leakage, adjust the door latches and interlock switches, using the following procedure. ONLY AUTHORIZED SERVICE PERSONNEL SHOULD MAKE THIS ADJUSTMENT The Interlock Monitor and Primary Interlock Switch act as the final safety switch protecting the user from microwave energy. The terminals between “COM” and “NC” of the Interlock Monitor must close when the door is opened. After adjusting the Interlock Monitor Switch, make sure that it is correctly connected. Mounting of the primary/monitor/secondary switches to the latch board. CHECK THE DOOR
Goldstar MV-1304W, 7-5 HOW TO REMOVE THE F.P.C. CONNECTOR Follow the steps below as illustrated in Figures 4 and 5 to remove the F.P.C. connector. (1) Hold the edges of the plastic fastener with thumb and forefinger. (Figure 4) (2) Lift up the lever of the plastic fastener from the terminal socket by lightly pressing the lever end with forefinger. (Figure 5) (3) Remove the F.P.C. connector from the terminal socket. HOW TO INSERT THE F.P.C. CONNECTOR Follow the steps below as illustrated in Figures 6 and 7 to insert the F.P.C. connector. (1) Insert the F.P.C. connector into the terminal socket securely with the fingers. (2) Hold the plastic fastener with thumb and
Goldstar MV-1304W, 7-15 COMPONENTS TEST PROCEDURES RESULTS HIGH-VOLTAGE CAPACITOR HIGH-VOLTAGE DIODE Measure the resistance: (1) Terminal to terminal Ohm- meter Figure 22 (2) Terminal to case Ohm- meter Figure 23 Measure the continuity: (1) Forward Ohm- meter Figure 24 (1) Reverse Ohm- meter Figure 25 Normal reading: Momentarily indicates several ohms, and then gradually returns to infinite ohms. Abnormal reading: Indicates continuity or infinite ohms from the beginning. Normal readings: Infinite. Abnormal reading: Indicates continuity. Normal readings: continuity. Abnormal reading: Infinite. Normal readings: Infinite. Abnormal reading: continuity.
7-7 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 “ADJUSTMENT PROCEDURE” on page 7-11, 12. Latch Board Secondary Interlock Switch Monitor Interlock Switch Primary Interlock Sw
Goldstar MV-1304W, 7-24 PROBLEM - G: Ventilation fan does not operate when “FAN HIGH/LOW” key is touched. 1 Check: 1. POWER SUPPLY 2. FUSE Runs Runs Runs Contact OK NO contact Replace magnetron thermostat Poor contact Replace circuit board Normal circuit board Contact OK Normal contact Correct seating Check contact of connector S1 (see page 7-4) Runs Replace ventilation motor ASS’Y NO runs Normal ventilation motor ASS’Y Check the contact of magnetron thermostat
Goldstar MV-1304W, 2-1 CAUTIONS • DO NOT operate on a 2-wire extension cord during repair and use. • NEVER TOUCH any oven components or wiring during operation. • BEFORE TOUCHING any parts of the oven, always remove the power plug from the outlet. • For about 30 seconds after the oven stops, an electric charge remains in the high voltage capacitor. When replacing or checking, you must discharge the high voltage capacitor by shorting across the two terminals with an insulated screwdriver. • Remove your watches whenever working close to or replacing the Magnetron. • DO NOT touch any parts of the control panel circuit. A resulting static electric dis
Goldstar MV-1304W, 7-20 “PLEASE TOUCH CLOCK PAD” does not appear in display window when power supply cord is plugged into wall outlet. Display does not show correct numbers and/or correct indications when programmed. Check: 1. POWER SUPPLY 2. FUSE (See “CHECKOUT PROCEDURES FOR FUSE BLOWING: on page 7-18) 3. OVEN CAVITY THERMOSTAT Before following this troubleshooting read “TRIAL OPERATION” on page 6-1. “DISPLAY” Problems, “A” thru “C” “BUZZER Problems, “F” “HELP UP” Problems, “D” thru “E” WH RD Measure voltage between pin 1 and pin 3 of
Goldstar MV-1304W, 7-17 COMPONENTS TEST PROCEDURES RESULTS RELAY2 Check for continuity of relay 2 with an ohm-meter. (Remove wire leads from relay 2 and operate the unit.) NOTES: • A MICROWAVE ENERGY TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON. • MAKE SURE THE WIRE LEADS ARE IN THE CORRECT POSITION. • WHEN REMOVING THE WIRE LEADS FROM THE PARTS, BE SURE TO GRASP THE CONNECTOR, NOT THE WIRES. B. CHECKOUT PROCEDURES (1) CHECKOUT PROCEDURES FOR FUSE BLOWING CAUTION:REPLACE BLOWN FUSE WITH 20 AMPERE
7-2 CAUTIONS • Be sure to check microwave leakage prior to servicing the oven if the oven is operative prior to servicing. • The service personnel should inform the manufacture importer, or assembler of any certified oven unit found to have a microwave emission level in excess of 5 mW/cm 2 and should repair any unit found to have excessive emission levels at no cost to the owner and should as
Goldstar MV-1304W, B. REMOVING THE OUT CASE(Figure 8) (1) Remove the vent grille by removing two screws securing it to the front of out case. (2) Remove four screws securing it to the air duct. (On the top plate of out case) (3) Remove the mounting plate by turning the two mounting rods securing itself. (4) Remove two screws securing them to the out case on the base plate. (Remove the mount-all from the out case by removing two screws securing it to the out case.) (5) Remove four screws securing them to the back plate. (6) Slap the both side of out case backward by
Goldstar MV-1304W, PRELIMINARY A. SINCE NEARLY 2,100 VOLTS EXISTS IN SOME CIRCUITS OF THIS UNIT REPAIRS SHOULD BE CARRIED OUT WITH GREAT CARE. The filament leads of magnetron carry High Voltage with respect to ground. Extreme caution must be exercised. Never plug the unit into a power source to determine which component is defective in high voltage section. B. TO AVOID POSSIBLE EXPOSURE TO MICROWAVE ENERGY LEAKAGE, THE FOLLOWING PRECAUTIONS MUST BE TAKEN BEFORE SERVICING. (1) Before the power is applied: (a) Make sure the primary interlock switch, the secondary interlock switch and the interlock monitor switch operate properly by opening and closing the door several by opening and closing the
1-1 Rated Power Consumption .....................................1,350W maximum (Microwave oven+Cook top lamps+Ventilation fan) Microwave Output ...................................................950W (IEC 705 TEST PROCEDURE) Frequency ...............................................................2,450 MHz ± 50 MHz Power Supply ..........................................................120 VA
Goldstar MV-1304W, CONTROL PANEL INSTRUCTIONS 4-2 1. DISPLAY: The display includes a clock and indicators to tell you time of day, cooking time settings, and cooking functions selected. 2. MORE: Touch this pad to add ten seconds of cooking time each time you press it. 3. LESS: Touch this pad to subtract ten seconds of cooking time each time you press it. 4. CLOCK: Touch this pad to enter the time of day. 5. TIMER: Touch this pad to set the kitchen timer. 6. POPCORN: Touch this pad when popping popcorn in your microwave oven. 7. POTATO: Touch this pad to cook from 1 to 4 potatoes. 8. BEVERAGE: Touch this pad to reheat one or tw
Goldstar MV-1304W, MICROWAVE OVEN SERVICE MANUAL MODEL: MV-1304W/B CAUTION BEFORE $SERVICING THE UNIT, READ THE SAFETY PRECAUTIONS IN THIS MANUAL. P/NO : 3828W5S1599 May, 2000 Printed in Korea Website http://biz.lgservice.com
Goldstar MV-1304W, 7-18 (2) CHECKOUT PROCEDURES FOR RELAY. - PROBLEM (A) - FAN motor and oven lamp turn on without touching START key when the door is closed. Remove the mate connector of I/O CON from the circuit board. Does the unit still operate? GOOD Replace the circuit board - PROBLEM (B) - FAN motor and oven lamp turn on When the door is closed and START key is touched. Measure the voltage at pin NO. 36 of U01 Voltage reading: 0 Vdc Replace the circuit board Defective RELAY1 or poor connection of RELAY1 Replace RELAY1 or correct the connection. NO NO YES NO NO YES YES GOOD
Goldstar MV-1304W, 7-16 COMPONENTS TEST PROCEDURES RESULTS CIRCUIT BOARD TOUCH KEY BOARD See page 7-19 for “CHECKOUT PROCEDURES FOR THE CIRCUIT BOARD” NOTE: A MICROWAVE ENERGY LEAKAGE TEST MUST ALWAYS BE PERFORMED WHEN THE UNIT IS SERVICED FOR ANY REASON. Measure the resistance between terminal pins of connector KEY CON. NOTE: When reconnecting the FPC connector, make sure that the holes on the FPC connector are properly engaged with hooks on the plastic fastener. MATRIX CIRCUIT FOR TOUCH KEY BOARD CONNECTOR(KEY CON) Figure 26 Resistance value When When not touched touched Less than More than 400 ohms 1 mega ohm 1 2 3 4 5 6 7 8 9 10 11 12 13
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