Dental Delivery Unit Operation Manual
REV-A
Page 30 of 45
for about 25mm, and pull out the cushion from backrest.
To reinstall the backrest cushion, you need to put the lock hole onto the head of buckle nail and
press it, and then push it down until the cushion gets to the right position.
5.6.4.2 Seat Cushion
To remove the seat cushion, you need to remove the screw first, and then lift the foot side of
the seat in order to make the cushion separate from the chair and be removed.
To reinstall the sear cushion, you need to put the pothook which is at the rear end of the seat
cushion under the chair, and then press down the seat plate until the cushion gets to the right
position. Fix with screw at last.
1. seat cushion 2.screw
1. backrest cushion 2. screw
5.6.4.3 Headrest Cushion
To remove headrest cushion, you need to locate the headrest well first so you can touch the
two screws on its back. Loosen the screws and remove the cushion.
Caution: Do not remove the screws or make the backup plate slide down from the locating
device. Or the brake device would be scattered.
To reinstall the headrest cushion, you need to locate the headrest well first. Put the cushion on
the headrest and fix the screw.
5.6.5 Junction Box Adjustment
Lift and remove the head cover of junction box (no need to use tools), then you can see its
inner structure clearly.
The junction box is installed on the ground of the treatment room, over the pipelines of water
and electricity. It consists of manual air cut-off valve and water cut-off valve, filter, pressure
pre-regulator, vacuum suction port, gravity drainage outlet and socket.
1
Air reducing valve 9
￠
6PU
（
to
junction box
）
2
Ball valve
10
Water filter
3
Air filter and
pressure relief
11
Water outlet
