Troubleshooting

The majority of problems reported with CLS equipment are about not being able to display a video source or not being able to hear sound. For example, a tutor may be using a laptop to show a YouTube video, and although they can see it they can’t hear it.

You can call ServiceLine on x25656 using the phone in the room for advice, and they may send a technician to assist you, but there are some simple things you can check yourself to fix the problem quickly.

Display

  • Have you selected the correct video source (PC, laptop, DVD etc.) using the control panel?
  • Did you press Hide picture on the touch-screen control panel? If so, press Show picture.
  • Is the data projector or flat-panel display switched on? In some smaller CLS rooms with ceiling-mounted projectors, you can reach up and press its ON button if necessary.

Laptop video

Audio

  • Is the volume on the PC or laptop turned up? Have you selected the correct audio output? See Connecting a laptop for details.
  • Is the volume on the room’s control panel turned up?
  • Did you press Silence sound on the touch-screen control panel? If so, press Activate sound
  • If you are using HDMI, try disconnecting and reconnecting the cable, making sure that it is securely plugged in. Check that you have selected the correct audio output.