Protection Circuit - NSK Varios 970 Operación Manual

Problem Probable Cause
Water is leaking
from the joint
between the
Irrigation Tube
and the Irrigation
Connector.
Water is leaking
Water leakage.
from the joint
between the
handpiece and
the cord.
Water is leaking
from the Control
Unit.
Tip oscillates, but
Handpiece LED
Handpiece
turns on and off.
LED does not
illuminate.
Tip oscillates, but
(Varios 970 LUX)
Handpiece LED
does not turn on.
Beeping while
power on.
Start Beeping
Beeping while
stopping
vibration of Tips.
* Repairs cannot be made by the customer.

14. Protection Circuit

It may overheat inside when you use this Control Unit in
more than Power 8 at G mode for long time.
In this case, Protection Circuit reduces the Power
automatically. (Power 7)
Bar Graph Indicator from 8 to 0 flashes. (Fig.42)
After Protection Circuit is released, the flashes stop.
However, Power Level can not automatically increase. If
needed, increase manually.
NOTICE
• During Protection Circuit function (during Bar Graph Indicator flash), the Control Unit can not increase the Power
Level.
• If Power Level decreases less than 7, Bar Graph Indicator stops flashing. However, it the Power increase more
than 8, flashes it again.
Cause
The Irrigation Tube is not connected
correctly.
O-Ring at the handpiece cord is
worn or damaged.
The water circuitry in the Control
Unit is damaged.
The handpiece is not connected into
the Handpiece Cord correctly.
Disconnection in the Handpiece
Cord, or failure in the Control Unit.
Depress Foot Control.
Abnormal heating of the Control
Unit.
20
Solution
Firmly insert the Irrigation Tube into the Irrigation
Connector inmost.
Replace with new O-Ring (Refer to  (2)
Changing O-Ring •Handpiece Cord).
Contact dealer.*
Firmly insert the handpiece into the Handpiece
Cord inmost.
Contact dealer.*
Release the Foot Control.
Stop the operation and leave until Control Unit
becomes cool.
Fig.42