18
TROUBLE SHOOTING GUIDE
CONDITION
CHECKPOINT
METHOD OF INSPECTION
CAUSE / REMEDY
Motor fails to rotate.
Power cord
Check power cord continuity between
If there is no continuity,
(no noise is heard
connection.
plug pins and contact base.
replace the power cord.
at all).
Motor continuity.
Check motor continuity between carbon
If there is no continuity, replace
brush holder tabs.
the motor.
Carbon brushes.
Check if there is gap between
If there is gap between carbon
carbon brush and conmutator.
brush and conmutator, replace
both carbon brushes.
ON/OFF Switch.
Check continuity across switch
If there is no continuity, replace
connections.
ON/OFF switch.
Thermal cut-out.
Check continuity across
If there is no continuity,
thermal cut-out tabs.
replace thermal cut-out.
Triac.
Check if the triac is in open circuit.
If it is in open circuit, replace it.
replace power control circuit.
Power control circuit.
Check if the diac is in open circuit.
If it is in open circuit,
replace power control circuit.
*Sliding potentiometer.
Check if the potentiometer is in
If it is in open circuit, replace it.
open circuit or if the lead wires
If the lead wire connections
connection are not correct.
are not correct, repair them.
Trimmer Potentiometer
Place the sliding potentiometer at min.
If it is adjusted at 450W
(VR1)
power and check if the potentiometer
and the motor doesn’t work,
(VR1) is adjusted at 450W.
replace power control circuit.
Motor runs but
Hose or Suction inlet.
Check if there is any blockage
If there is any blockage,
does not suction.
in the hose or suction inlet.
remove it.
Dust bag / Central filter.
Check if dust bag is full or dust
If the paper bag is full, replace it.
accumulated in central filter.
If the central filter is dirt,
clean or replace it.
Noise or vibration.
Motor fan
Check dust accumulated in motor fan
If there is dust accumulated in
(it could happen if the vacuum cleaner
motor fan, replace the motor and
has been used with a broken dust bag
check filter condition. (never try to
or without central filter).
dismantle the motor fan).
Motor does
*Sliding potentiometer.
Check if the potentiometer is
If it is short-circuited, replace it.
not change power.
short-circuited
(Runs always
at full speed)
Power control circuit
Check if the power control circuit is
If it is short-circuited, replace it.
short-circuited.
Motor runs
* Sliding potentiometer
Check possible bad contact of the
If there is bad contact,
irregularly.
sliding potentiometer tabs.
replace the sliding potentiometer.
NOTE: Parts marked (*)only affect to mdels MC-E781 and MC-E783.
