Aiphone TC-20M
Aiphone Counter Intercom 20-Station Master Unit TC-20M Instruction Manual
Brand: Aiphone | Model: TC-20M
1. Introduction
This manual provides detailed instructions for the installation, operation, and maintenance of the Aiphone Counter Intercom 20-Station Master Unit, model TC-20M. This master unit is designed to connect up to 20 sub-units, allowing for individual calling of each connected sub-unit via a station selection switch. Please read this manual thoroughly before using the product to ensure proper and safe operation.

Figure 1: Aiphone Counter Intercom 20-Station Master Unit TC-20M. This image displays the white rectangular master unit with its attached handset on the left, a speaker grille, and a panel of multiple selection buttons on the right. A power cord extends from the right side of the unit.
2. Key Features
- Expandable Connectivity: Supports connection of up to 20 sub-units.
- Individual Station Calling: Each connected sub-unit can be individually called using dedicated selection switches.
- Flexible Installation: Designed for both wall-mounted and desktop use.
- Standard Power Supply: Operates on AC100V 50/60Hz.
- Compact Design: Lightweight at approximately 2.7kg, making it easy to handle and install.
3. Setup and Installation
Before beginning installation, ensure all components are present and undamaged. Refer to the packaging list for verification. Installation should be performed by qualified personnel to ensure safety and proper functionality.
3.1. Unpacking
- Carefully remove the master unit and any accessories from the packaging.
- Inspect the unit for any signs of damage during transit. If damaged, do not proceed with installation and contact your supplier.
- Retain the packaging materials for future transport or storage.
3.2. Mounting Options
The TC-20M master unit can be installed as a desktop unit or wall-mounted.
- Desktop Installation: Place the unit on a stable, flat surface, ensuring adequate ventilation.
- Wall-Mount Installation:
- Identify a suitable wall location, away from direct sunlight, heat sources, and moisture.
- Use appropriate screws and anchors (not included) to secure the unit to the wall. Ensure the mounting surface can support the unit's weight.
3.3. Wiring Connections
Connect the sub-units and power supply according to the wiring diagram provided in the separate installation guide (if applicable) or consult a professional electrician. Ensure all connections are secure and correctly polarized.
- Sub-unit Connections: Connect up to 20 sub-units to the designated terminals on the master unit.
- Power Connection: Plug the master unit into a standard AC100V 50/60Hz power outlet.
4. Operating Instructions
The TC-20M master unit is designed for straightforward operation. Follow these steps to use the intercom system.
4.1. Making a Call
- Identify the sub-unit you wish to call. Each sub-unit corresponds to a specific selection switch on the master unit.
- Press the corresponding station selection switch for the desired sub-unit.
- Lift the handset and speak into the microphone. The sub-unit will receive your audio.
- To end the call, replace the handset.
4.2. Receiving a Call
When a sub-unit initiates a call to the master unit, an audible signal will be heard.
- When the master unit rings, lift the handset to answer the call.
- Speak into the microphone to communicate with the calling sub-unit.
- Replace the handset to terminate the conversation.
4.3. Volume Adjustment
Adjust the speaker and microphone volume using the controls located on the master unit (refer to the unit's labels for specific control locations).
5. Maintenance
Regular maintenance ensures the longevity and optimal performance of your Aiphone TC-20M master unit.
5.1. Cleaning
- Disconnect the power before cleaning.
- Wipe the exterior of the unit with a soft, dry cloth.
- For stubborn dirt, use a slightly damp cloth with a mild, non-abrasive cleaner. Do not use strong chemicals or abrasive materials.
- Ensure no liquid enters the unit's openings.
5.2. Storage
If storing the unit for an extended period, disconnect it from power and store it in a cool, dry place, away from direct sunlight and extreme temperatures. It is recommended to use the original packaging for protection.
6. Troubleshooting
This section provides solutions to common issues you might encounter with your TC-20M master unit. If the problem persists after trying these solutions, please contact customer support.
| Problem | Possible Cause | Solution |
|---|---|---|
| No power to the unit. | Power cord unplugged; power outlet malfunction; circuit breaker tripped. | Ensure power cord is securely plugged in. Test the outlet with another device. Check and reset the circuit breaker. |
| Cannot hear sub-unit or sub-unit cannot hear master unit. | Volume too low; faulty wiring; faulty handset/speaker. | Adjust volume controls. Check all wiring connections for security and correctness. If problem persists, professional service may be required. |
| Cannot call a specific sub-unit. | Incorrect station selection; sub-unit not connected or faulty. | Ensure the correct station selection switch is pressed. Verify the sub-unit is properly connected and functioning. |
7. Specifications
| Attribute | Detail |
|---|---|
| Brand | Aiphone |
| Model Number | TC-20M |
| Power Supply Voltage | AC100V 50/60Hz |
| Number of Sub-unit Connections | Up to 20 units |
| Maximum Installation Count (Master Unit) | 2 units |
| Maximum Installation Count (Sub-unit) | 60 units |
| Form Factor | Wall-mounted, Desktop type |
| Item Weight | Approximately 2.7 kg (3.52 Kilograms as per package) |
| Package Dimensions | 37.79 x 33.2 x 19.7 cm |
| ASIN | B017X1IKC8 |
| Date First Available on Amazon.co.jp | November 13, 2015 |
8. Warranty and Support
8.1. Warranty Information
Aiphone products are manufactured to high quality standards. For specific warranty terms and conditions, please refer to the warranty card included with your product or visit the official Aiphone website. Keep your proof of purchase for warranty claims.
8.2. Customer Support
If you encounter any issues not covered in the troubleshooting section or require further assistance, please contact Aiphone customer support. Contact details can typically be found on the official Aiphone website or in the product packaging.
For more information, visit the official Aiphone website: www.aiphone.com
Ask a question about this manual
Ask about setup, troubleshooting, compatibility, parts, safety, or missing instructions. Manuals+ will review the question and use this page’s manual context to help answer it.


