Troubleshooting Guide - Panasonic MC-CG487-ZC79 Service Manual

3 Troubleshooting Guide

CONDITION
Motor fails to rotate
(no noise is heard at all)
Motor runs but there is no suction
Noise or vibration
Motor does not change power
(runs always at full speed)
Motor runs irregularly
CHECK POINT
Power supply cord
Fuse
(Plug for UK only)
Fuse of P.C.B. Ass'y
(250V, 12A)
Motor continuity
ON/OFF Switch
Triac (Inside of P.C.B.)
P.C.B. Ass'y
Hose or Suction inlet, Extension
wand and nozzle
Dust bog / Secondary filter
Motor fan
Power control
P.C.B. Ass'y
P.C.B. Ass'y
METHOD OF INSPECTION
Check power supply cord continu-
ity.
Check plug fuse continuity.
Check fuse continuity.
Check the conduction between the
terminals of the motor.
Check continuity across switch
connections
Check if the triac is in open circuit. If it is in open circuit, replace
Check the internal parts for any-
thing unusual. (burn-out, melt-
down, etc.)
Check if there is any blockage in
the indicated parts.
Check if dust bag is full or Second-
ary filter is choked up.
Check dust accumulated in motor
fan (it could happen if the vacuum
cleaner has been used without cen-
tral filter).
Adjust the power control and check
whether or not the resistance var-
ies. (Gray←→Blue)
Examine the triac in the P.C.B.
Ass'y and check whether or not T1
and T2 are short-circuited.
Check possible bad contact of
P.C.B. Ass'y.
5
TRANSACTION
If there is no continuity, replace the
cord reel patition unit.
If there is no continuity, replace the
cord reel patition unit.
If there is no continuity, replace
P.C.B. Ass'y.
If there is no continuity, replace the
or motor.
If there is no continuity, replace
P.C.B. Ass'y.
P.C.B.Ass'y.
If anything is found unusual,
replace the P.C.B. assembly with
new one.
If there is any blockage, remove it.
If dust bag is foll, replace with a
new one. If Secondary filter is
choked up, remove and clean it out
or replace.
If there is dust accumulated in the
motor fan, replace the motor and
check filter condition. (never try to
dismantle the motor fan)
If the resistance does not vary, then
replace the P.C.B. Ass'y.
If they are short-circuited, then
replace the P.C.B. Ass'y.
Replace P.C.B. Ass'y.