KI 1387 AV equipment in teaching rooms KI 0905 What to do if the projector won't work KI 0911 What to do if the sound doesn't work KI 0932 What do I do if the micropohone doesn't work? KI 1023 How to use the control panel in a teaching room KI 1570 Using Phonak "Roger" equipment for assisted listening (fixed installation)