The LG BPM55 is a high-performance commercial microwave oven designed for professional kitchen use. This service manual provides comprehensive technical information for authorized service technicians, including safety precautions, technical specifications, disassembly procedures, troubleshooting guides, and maintenance instructions. Below are key sections covering all aspects of service and repair.
Critical safety information for service technicians working on the LG BPM55 microwave oven.
| Hazard | Precaution |
|---|---|
| High Voltage | Disconnect power and discharge capacitors before servicing |
| Microwave Radiation | Never operate with door open or safety interlocks bypassed |
| Hot Surfaces | Allow unit to cool before disassembly |
| Electrical Shock | Use insulated tools and wear protective equipment |
| Magnetron | Handle with care - contains beryllium oxide |
Major components and their locations within the LG BPM55 microwave oven.
| Component | Location | Function |
|---|---|---|
| Magnetron | Right side of cavity | Generates microwave energy |
| High Voltage Transformer | Bottom compartment | Steps up voltage for magnetron |
| Capacitor | Near transformer | Stores electrical energy |
| Control Board | Front panel | Manages oven operations |
| Door Interlock Switches | Door frame | Safety shutoff mechanism |
Step-by-step instructions for safe disassembly of the LG BPM55.
WARNING! Always verify capacitor discharge before touching internal components.
Complete wiring diagrams and circuit descriptions for troubleshooting electrical issues.
| Symptom | Possible Cause | Corrective Action |
|---|---|---|
| No power | Power cord, fuse, door switch | Check power source, replace fuse, test door interlock |
| No heating | Magnetron, capacitor, diode | Test high voltage components, replace faulty parts |
| Sparking inside | Metal objects, waveguide cover | Remove foreign objects, replace waveguide cover |
| Turntable not rotating | Motor, drive coupler | Test turntable motor, replace drive coupler |
| Error codes displayed | Sensor failure, control board | Refer to error code chart, replace sensors |
Authorized replacement parts and installation procedures.
Note: Use only LG authorized replacement parts.
Technical calibration steps for optimal performance.
Recommended maintenance intervals and procedures.
| Interval | Maintenance Task |
|---|---|
| Monthly | Clean interior and exterior surfaces |
| Quarterly | Inspect door seal and interlock switches |
| Annually | Complete electrical safety check |
| As needed | Replace air filter and light bulb |
Diagnostic error codes and their meanings.
| Error Code | Description | Solution |
|---|---|---|
| E1 | Temperature sensor failure | Replace temperature sensor |
| E2 | Communication error | Check control board connections |
| E3 | Door interlock fault | Test door switches and alignment |
| E4 | Magnetron overheat | Check cooling fan and ventilation |
LG BPM55 warranty coverage and service terms.