A 7 Malfunctions - KaVo Dental K9 4930 Instructions D'utilisation

K9 4930

A 7 Malfunctions

Repair and maintenance work on the
electrical part of the unit may be per-
formed only by specialists or by persons
who have been trained in the factory and
have been made aware of the safety regula-
tions. Before opening the housing parts,
disconnect the mains plug or isolate the
unit completely from the power supply so
that there is no power to the unit.
F • K9 handpiece no longer rotates or
stops from time to time.
C • K9 handpiece is blocked, possibly due
to open chuck system.
R • Close chuck correctly with inserted tool
(see A 5.1).
C • Break in connecting cable.
R • Check connecting cable incl. plug
devices and if necessary replace.
C • Carbon brushes worn.
R • Replace carbon brushes (see A 6.5).
C • Fault in the electrical system of K9
controller.
R • Check K9 controller or have repaired.
F • Tool is no longer adequately retained
in the chuck..
C • Diameter of tool shaft does not agree
with chuck.
R • Use chuck or tool with appropriate
diameter.
C • Chuck has become loose.
R • Insert chuck correctly (see A 6.1).
C • Chuck is worn.
R • Replace chuck (see A 6.1).
F • Loud running noise or K9 handpiece
heats up
C • Ball bearing faulty owing to wear or
soiling.
R • Check ball bearing and if necessary
replace. (see A 6.2)
C • Prolonged operation under very high
load.
R • Eliminate cause of high load, if neces-
sary increase speed or use tools with
smaller diameters.
C • Electronics of K9 controller faulty.
R R • Check K9 controller or have repaired.
F = Fault C = Cause R = Rectification
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