Panasonic MC-CG663ZR79 / MC-CG661KR79 Service Manual ▷ View online
5
3 Troubleshooting Guide
CONDITION
CHECKPOINT
METHOD OF INSPECTION
CAUSE / REMEDY
Motor fails to rotate
(no noise is heard at all)
(no noise is heard at all)
Power supply cord
Check power supply cord continu-
ity.
ity.
If there is no continuity, replace the
cord reel patition unit.
cord reel patition unit.
Fuse of P.C.B. Ass’y
(250V, 12A)
(250V, 12A)
Check fuse continuity.
If there is no continuity, replace
P.C.B. Ass’y.
P.C.B. Ass’y.
Motor continuity
Check the conduction between the
terminals of the motor.
terminals of the motor.
If there is no continuity, replace the
or motor.
or motor.
ON/OFF
Switch
Check continuity across switch
connections
connections
If there is no continuity, replace
P.C.B. Ass’y.
P.C.B. Ass’y.
Triac (Inside of P.C.B.)
Check if the triac is in open circuit. If it is in open circuit, replace
P.C.B.Ass’y.
P.C.B. Ass’y
Check the internal parts for any-
thing unusual. (burn-out, melt-
down, etc.)
thing unusual. (burn-out, melt-
down, etc.)
If anything is found unusual,
replace the P.C.B. assembly with
new one.
replace the P.C.B. assembly with
new one.
Motor runs but there is no suction
Hose or Suction inlet
Check if there is any blockage in
the hose or suction inlet.
the hose or suction inlet.
If there is any blockage, remove it.
Dust bog / Secondary filter
Check if dust bag is full or Second-
ary filter is choked up.
ary filter is choked up.
If dust bag is foll, replace with a
new one. If Secondary filter is
choked up, remove and clean it out
or replace.
new one. If Secondary filter is
choked up, remove and clean it out
or replace.
Noise or vibration
Motor fan
Check dust accumulated in motor
fan (it could happen if the vacuum
cleaner has been used without cen-
tral filter).
fan (it could happen if the vacuum
cleaner has been used without cen-
tral filter).
If there is dust accumulated in the
motor fan, replace the motor and
check filter condition. (never try to
dismantle the motor fan)
motor fan, replace the motor and
check filter condition. (never try to
dismantle the motor fan)
Motor does not change power
(runs always at full speed)
(runs always at full speed)
Power control
Adjust the power control and check
whether or not the resistance var-
ies. (Gray
whether or not the resistance var-
ies. (Gray
←→Blue)
If the resistance does not vary, then
replace the P.C.B. Ass'y.
replace the P.C.B. Ass'y.
P.C.B. Ass’y
Examine the triac in the P.C.B.
Ass'y and check whether or not T1
and T2 are short-circuited.
Ass'y and check whether or not T1
and T2 are short-circuited.
If they are short-circuited, then
replace the P.C.B. Ass'y.
replace the P.C.B. Ass'y.
Motor runs irregularly
P.C.B. Ass’y
Check possible bad contact of
P.C.B. Ass’y.
P.C.B. Ass’y.
Replace P.C.B. Ass’y.
6
4 Disassembly and Assembly Instructions
Important notice: Before replacing any components, make sure to turn OFF the vacuum cleaner.
Remove the power plug from the outlet.
4.1.
Dust box cover assembly
removal
removal
1. Open the dust box cover assembly at an angle of approx.
45
°. Insert a flat-blade screwdriver between the upper
body and the dust box cover assembly and move it in the
direction of the arrow mark to remove the dust box cover
assembly from its right side.
direction of the arrow mark to remove the dust box cover
assembly from its right side.
4.2.
Separate the upper and lower
body units
body units
1. Remove the five screws fixing the upper body U and
lower body U.
2. Remove the screw fixing the upper body U from the rear
side.
7
3. Lift the upper body U to separate it from the lower body U.
4.3.
Printed circuit board assembly
(P.C.B Ass’y) removal
(P.C.B Ass’y) removal
1. Remove the Swivel cap unit and Insulation plate.
2.
3. Disengage the fast-on terminal of the wires (red) and
(blue) which lead to the cord reel partition wall connected
to the printed circuit board assembly.
to the printed circuit board assembly.
4. Remove the P.C.B. Ass'y from the P.C.B. holder.
8
5. Remove the two screws fixing the P.C.B. holder and pull it
out from the lower body U.
* For removing the printed circuit board assembly,
first remove the fast-on terminal for the connecting
section for the motor.
4.4.
Motor removal
1. Remove the dust box lid assembly. (Refer to paragraph
4.1 on P.6)
2. Remove the upper body from the lower body. (Refer to
paragraph 4.2 on P.6)
3. Remove the printed circuit board Ass’y. (P.C.B Ass’y)
(Refer to paragraph 4.3 on P.7)
4. Remove the two screws fixing the P.C.B. holder and pull it
out from the lower body U.
5. Lift the motor section from the lower body U.
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