1. General Information

• Manufacturer: Mitsubishi Electric (Elevator & Escalator Division)

• Model: LHH-205AG24

• Type: Elevator Car Operation Panel / Display Control Board

• Common Use: Installed inside elevator cars to control button inputs, floor displays, and possibly emergency communication.

2. Key Features & Functions

Primary Functions:

• Button Input Processing – Registers passenger requests (floor selections, door open/close commands).

• Floor Indicator Control – Drives 7-segment LED displays or other indicators to show current floor position.

• Communication Interface – Connects to the main elevator controller (likely via serial or CAN bus).

• Emergency & Alarm Integration – May interface with emergency stop buttons, alarm systems, or intercoms.

Technical Specifications (Estimated):

• Input Voltage: Likely 24V DC or 110V AC (varies by elevator model).

• Display Type: Supports LED or LCD floor indicators (depends on elevator model).

• Button Interface: Matrix or direct wiring for car operation panel buttons.

• Safety Compliance: Meets elevator safety standards (EN 81-20/50, ASME A17.1, etc.).

3. Common Applications

• Used in Mitsubishi NEXIEZ, ELENESSA, or older elevator models.

• Typically found in:

  • Elevator car operation panels (inside the cab).

  • Hall call panels (if compatible with the system).

4. Troubleshooting & Common Issues

Symptoms of a Faulty LHH-205AG24 Board:

• Unresponsive buttons (floor selections not registering).

• Display malfunctions (missing segments, flickering, or no floor indication).

• Elevator freezes or ignores commands.

• Error codes related to car operation panel communication.

Diagnostic Steps:

1. Check power supply (confirm correct voltage to the board).

2. Inspect connectors for loose or corroded pins.

3. Test button inputs with a multimeter (check for signal continuity).

4. Look for burnt components (capacitors, resistors, ICs).

5. Replacement & Sourcing Options

Where to Buy?

• Mitsubishi OEM Suppliers (authorized elevator parts distributors).

• Elevator Parts Specialists (e.g., ELEVATORPARTS.COM, Direct Elevator Parts).

• Used/Refurbished Units (eBay, B2B marketplaces – verify compatibility).

Installation Notes:

• Should be installed by certified elevator technicians (safety & compliance reasons).

• Ensure proper model matching (cross-check with elevator serial number).