1. Check notesÕ status in 3 Cassette
  2. Check 3 cassette specifications
  3. Check if the CDU Board CN6 and 3 Cassette FM Board CN1 are connected.
  4. Check settings of 3 Cassette FM Board Dip Switch (#2, #4, #6 On)
  5. Check if the CS37 sensor cable are disconnected (3 CST FM B/D CN3).
  6. Exchange a sensor after abnormal operating the CS37 sensor .