hi there.....
led 1 will light up when a call is put in and should go out after 1 second.if on permantly a short circuit on main pcb.replace.....
led 4 will pulse once per second indecating correct software operation.if not pulsing replace pcb..........
led 6-5v led which indecates 5v supply.
if replacing main batteries and can not remove second one you need to[SWING CHAIR OVER] take the front covers of above footrest by two allen fixings situated behind/top,,then once remove the covers you should see allen bolts x 3 first mark with a pen/pencil where chair frame aligns with carriage covers so when you loosen allen bolts and then swing chair over you will then be able to remove top carriage cover to take out battery...........hope this will help.............ian.....portsmouth uk
IAN, March 2012