AV emergency call service hotline is 394 36060.

Classroom on-call service hours are:

Please visit:Equipment List

You can borrow three kinds of equipment. They are:

1. Audio Equipment
2. Video Equipment
3. Presentation / Projection Equipment

For more details, please refer to AV EQUIPMENT LOAN COUNTER

You may:

- reserve the equipment by calling 394 36062 and

- return the Equipment Booking Form to AVSU by internal mail or fax at 2603 5301.( The Equipment Booking Form can be obtained from AVSU Loan Counter or downloaded from
http://www.avsu.cuhk.edu.hk/upload/files/1/file/5f1fcea1ba635.pdf ), or

- use Online Booking System ( To use the system, you must be a CUHK full-time staff and have registered to the system. )

The password is managed by the concerned classroom management offices. You can contact the classroom management offices to get the password before your lesson. For the phone numbers of management offices, please refer to : Access to AV Cabinet

AV Control System is designed to make the operation of AV equipment more user-friendly. There are 2 types of AV control system. Please refer to their operation manuals as follows:

1) For control system with large touch panel, please refer to CT-1600 CT-1550 Central Control System

Wired microphone is locked inside the AV cabinet. You need a password to unlock the AV cabinet.

Please check the following:

1. make sure that the switch of microphone is turned ON, and
2. make sure that the AV Control System is switched ON, and
3. make sure that the microphone cable is connected to the AV microphone socket, and
4. make sure that the level bar of mic volume in control system is not "mute" or minimized.

Wireless microphone is locked inside the AV cabinet. You need a password to unlock the AV cabinet.

Please check the following:

1. make sure that the microphone is switched ON, and
2. make sure that the AV Control System is switched ON, and
3. make sure that the level bar of mic volume in control system is not "mute" or minimized, and
4. replace the battery if necessary.

Please visit Video Demonstration to watch the Computer Operation Video Demo.

No, there is a recovery system installed in the classroom built-in PC. When the computer boots up, a preset file system will be reloaded. All newly installed software or files will be erased.

Yes, all built-in PC in classrooms are connected with campus network and can access the Internet through VPN connection. Run the "Internet Login" icon on desktop and login with your computing ID and CWEM password provided by ITSC.

The wireless mouse is locked inside the AV cabinet. You need a password to unlock the AV cabinet.

Wireless mouse is battery-operated. If the wireless mouse does not work, please contact AVSU ( Tel: 394 36060 ) for assistance.

Please refer to Writing Panel Operation Manual

Please contact AVSU ( Tel: 394 36060 ) for assistance.

Please visit Notebook - HDMI Connection or Notebook - VGA Connection to watch the Notebook Operation Video Demo and try the following procedures:

1. Press "Power ON" button to switch ON AV Control System
2. Press "Notebook" button to start notebook mode.
3. Connect HDMI cable or VGA cable to your notebook
4. Switch ON your notebook
5. If using HDMI connection
   Press "HDMI Input" icon on the Control System touch panel (default input selection is VGA)
6. If using VGA connection
   Hold [Fn] key and press [CRT/LCD] key once or twice to select dual display mode

The [CRT/LCD] key varies on different notebooks. The following table is for your reference only:

If there is no projection image from the notebook computer, you can:

1. Check connection between notebook and HDMI / VGA cable, or
2. If using VGA connection, switch your notebook to dual projection mode by holding the "function key" (Fn) or
3. restart your notebook

In most of the communal classrooms and lecture theatres, the projection system supports the following display resolution settings:

1. 1280 x 800, 60Hz
2. 1024 x 768, 60Hz

You can connect audio cable to your notebook. The AV cable is either hanged outside the AV cabinet or kept inside the box on the desk top of lectern.

You can set up VPN connection to your notebook computer. To set up VPN connection, please refer to the instructions provided by ITSC - ClassNet (Classroom Network)

Please visit DVD/CD Player Operation Video Demo to watch the DVD / CD Operation Video Demo.

 You may: 

1. check the power status of DVD player and make sure that it is switched ON.
2. try to control the DVD player by pressing the buttons on the DVD player or remote control and report to AVSU (Tel: 394 36060)

The DVD player may not support the region code of your DVD disc. Please contact AVSU (Tel: 394 36060)

You can press DVD Advanced Control button and then press the Menu button on the touch panel to select different chapters.

You can press DVD Advanced Control button and then press the Language button on the touch panel to select different languages.

You can press DVD Advanced Control button and then press the Subtitle button on the touch panel to select different subtitles.

All disc players support time search function for DVD. You can use the remote control to control the time search function. However, not all the disc players support time search function for VCD.

You can connect your AV device (e.g. DV camera, MP3 Player,etc.) by using the provided AV cable. The AV cable is either hanged outside the AV cabinet or kept inside the box on desk top of lectern.

Please visit Visual Presenter Operation Video Demo to watch the Visual Presenter Operation Video Demo.

Please check the following:
1. Make sure that the AV Control System is switched ON and "Visual Presenter" icon has been pressed.

2. Check the power of the visual presenter.

3. Switch ON the visual presenter by pressing the power button on the visual presenter.

Please check the following:

1. make sure the switch of power socket on the wall is "ON", or
2. switch the OHP to "Spare Lamp" position.

You can:

1. adjust the focus of the OHP.
2. adjust the distance between the OHP and the screen.