OWNERS MANUAL 23
TROUBLE SHOOTING
Twitching backrest
Chair’s backrest is moving down but it always stops after few centimeters when manually driven
but moves correctly when automatically driven.
Solution:
The reason is at the electric current limit, which is all the time checked by the processor. The
backrest motor takes too much current. In chairs, which have been moving correctly before, this is
due to the gradual stuck of the backrest motor. Current to correct functioning motor is between 2
and 4 A, and is limited in downward moving to 7 A.
If there are other disfunction as well (lift motor is cutting off as well), the reason may be in remote
transmission.
Measures:
o If the reason seems to be the remote control, try to drive the chair with recharge cable connected.
If other hand or foot control is available, try with it. (Remember to put the same ”hard code” for
the new remote control).
o Check the gears by eye, that they are in condition. If not, change the complete motor.
o Put a little bit of white grease on the drive screw.
o If it doesn’t help, check next that the case of the motor hasn’t moved from its place; check that
the motor fitting screws are tight. There is the possibility, that the rotor is sticking with the field
magnets; knock slightly the motor itself with a soft hammer to free the sticking rotor.
o If it doesn’t help, put little bit oil on the brake.
o The failure can be at the measuring of current on the main pc-board. Change the pc-board.
o If it doesn’t help, change the complete backrest motor.
Current limits: Lift 16 A
Tilt 7 A
PRINCIPLE OF EPROM MARKINGS
For instance the marking 6A.8B3
Marks left from the point are for ”hardware”, right for ”software”.
Old EPROM could always be replaced by a new one presuming new software version is same or
newer. For instance, 6A.8B3 could be replaced by 6A.8B8
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