With the Heljan model please ensure the directional lights are functioning correctly prior to decoder installation. We have found some models where bulbs are creating a `short` which can cause damage to the decoder.
Below is a list of the Function keys and their assignments applicable to this model.
F0. Lights on/off (if fitted on model)
F1. Sound on/off
F2. Horn 1 – double tone a
F3. Horn 2 – double tone b
F4. Horn 3 – single tone
F5. Buffering up
F6. Coupling up
F7. Flange squeal
F8. Guards whistle
F9. Carriage door slam
F10. Wheel/track ‘groan’
F11. Seagull for those coastal layouts!
F12. Shunting mode. Press once the loco goes slowly press again and you are back to normal control.
F13. Acceleration/Deceleration. Press once to over ride, press again to cancel.
F14. Aux 1
F15. Aux 2