LAUNCH KWB-421 Wheel Balancer User’s Manual
11
5.2 Wheel Balancer Troubleshooting
Error Descriptions
Reasons
Solutions
Screen no display during
start
1.The switch is wrong
2. External circuit is wrong
1.Change another one
2. Check the electric power circuit
with multi-meter.
Display normal, but
the machine can not
start and with some
noise , Err1 displayed
1.The capacitor of the electric machine
is disabled
2.380V power with no enough phase
1.Change capacitor 20UF/400V
2.Check the power
Err2 displayed
1.The wheel is not installed
2. Install the rim but with no tyre.
3. The adaptor is not tightened.
4. The wheel is not installed correctly or
it is not tightened.
5. The belt is over loose or tight.
1.Install the wheel
2.Install the tyre
3.Tighten the anchor screw
4.Install a suitable adaptor
5.Readjust the belt
Err3 displayed
The wheel has a too big imbalance
value
Change another wheel or do the
self-calibration again.
Err4 displayed
1. If the wheel turned reversely, the
phase wire is wrong connected.
2. If the wheel turned forward, the
sensor is wrong.
1.Adjust the phase
2.Readjust the position or change
another one
Err5 displayed
The wheel shield is not put down
Put down the shield
Err7 displayed
EMS memory data lose
Do the self-calibration again
Only display “00-00”,no
values displayed
1.The wire of the sensor is cut off or it
is not well connected
2.EMS memory data lose
1.Connect the wire
2.Refer to the manual, correct the
EMS memory value
The value of variable
range exceeds 5 grams
when the wheel turns.
1.The wheel is not clean or the fitting
surface of the rim center hole is
distorted
2.The sensor is wet or the lock nut is
loose
3. The voltage is lower or the air
pressure of the tyre is low or the
adaptor is not tightened or the cabinet
is not fixed on the ground.
1.Change a wheel
2.Drying it or readjust the sensor
3. Install voltage stabilizer; charge the
tyre; tighten the flange or the adaptor
by a lock nut; fix the cabinet on the
ground.
The value of variable
range reaches tens of
grams when the wheel
turns.
1.The wheel is not clean or the
imbalance value is too big.
2.The sensor is out of action
3.The voltage is lower
1.Change a wheel
2.Check the sensor and the
connection
Check the power or install a voltage
regulator
Summary of Contents for KWB-421
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