LG Electronics LMV1825SB, LMV1825SBQ, MV1825SW 7-21

7-21

PROBLEM - A: PLEASE SET TIME OF DAY does not appear in display window when power supply cord is

plugged into wall outlet.

PROBLEM - B: 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

1

1

C. TROUBLE SHOOTING

Before following this troubleshooting read TRIAL OPERATION on page 6-1.

¥ DISPLAY Problems, A thru C

¥ HELP UP Problems, D thru E ¥ BUZZER Problems, F

Measure voltage between pin 1

and pin 3 of connector CN1.

Measure resistance of touch

key board after removing

connector S1.

(See page 7-4 and 7-17)

0120

120V Replace

circuit board Normal

circuit board

Normal

resistance

Voltage

incorrect

Normal

resistance

Resistance

incorrect Replace touch

key board. Normal touch

key board

Poor

contact Correct

seating

Contact

ok Replace

circuit board Normal

circuit board

Normal

contact

Check contact

of connector S1

Correct

connections

0120

WH

RD

Runs

Runs

Runs

Runs

Runs

Contents

Main CAUTION FOREWORD TABLE OF CONTENTS SPECIFICATIONS CAUTIONS MAGNETRON THE OVEN IS TO BE SERVICED ONLY BY PROPERLY QUALIFIED SERVICE PERSONNEL. MICROWAVE RADIATION INSTALLATION PRECAUTIONS ON INSTALLATION GROUNDING INSTRUCTIONS BEFORE YOU BEGIN, READ THE FOLLOWING INSTRUCTIONS COMPLETELY AND CAREFULLY. WARNING OPERATING INSTRUCTIONS CONTROL PANEL INSTRUCTIONS 4-2 WARNING: Page MATRIX CIRCUIT FOR TOUCH KEY BOARD GENERAL INFORMATION FOR SERVICE GENERAL PRECAUTIONS IN USE TRIAL OPERATION FEATURES AND SPECIFICATIONS FEATURES SERVICE INFORMATION PRECAUTIONS AND REPAIR SERVICE TIPS PRELIMINARY MICROWAVE LEAKAGE TEST CAUTIONS EQUIPMENT MEASURING MICROWAVE ENERGY LEAKAGE MEASUREMENT WITH THE OUTER CASE REMOVED POWER OUTPUT MEASUREMENT MEASUREMENT WITH A FULLY ASSEMBLED OVEN P = NOTE WHEN MEASURING RECORD KEEPING AND NOTIFICATION AFTER MEASUREMENT DISASSEMBLY INSTRUCTIONS Figure 1 HOW TO REMOVE THE F.P.C. CONNECTOR HOW TO INSERT THE F.P.C. CONNECTOR B. REMOVING THE OUT CASE(Figure 8) WIRE COLOR 7-7 Latch Board Secondary Interlock Switch Figure 9 C REMOVING THE DOOR INTERLOCK SWITCHES (Figures 9,10) Figure 10 D. REMOVING MAGNETRON E. REMOVING STIRRER FAN F. REMOVING DOOR (Figure 16) G. DISASSEMBLING DOOR (Figure 17) H. ASSEMBLING DOOR I. REMOVING THE VENTILATION MOTOR J. REPLACING THE HUMIDITY SENSOR K. REMOVING THE TURNTABLE MOTOR Wire Leads Turntable Motor INTERLOCK SYSTEM INTERLOCK MECHANISM Page INTERLOCK CONTINUITY TEST A. PRIMARY INTERLOCK SWITCH TEST B. SECONDARY INTERLOCK SWITCH TEST C. MONITOR SWITCH TEST COMPONENTS TEST PROCEDURE RESULTS TEST AND CHECKOUT PROCEDURES, AND TROUBLE SHOOTING - CAUTIONS - A. TEST PROCEDURES Page 1 2 3 BK RD WH 7-17 COMPONENTS TEST PROCEDURES RESULTS Figure 29 TOUCH KEY BOARD SENSOR (For sensor model only) B. CHECKOUT PROCEDURES Page Page 7-21 7-22 7-23 7-24 7-25 1 EXPLODED VIEW DOOR Page 8-3 OVEN CAVITY Page 8-5 INTERIOR (I) 8-6 INTERIOR (II) 8-7 INSTALLATION 8-14 SCHEMATIC DIAGRAM OF P.C.B