Bosch WBE 4420 Instrucciones De Reparacion página 41

8. Faults
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Other possible malfunctions are primarily of a technical nature and are to be checked and if necessary rectified
by a qualified engineer. Always contact the customer service of your authorized Bosch equipment dealer.
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To enable action to be taken quickly, it is important to inform customer service of the specifications on the
rating plate (label on the flange end of the WBE 4420) and the nature of the problem.
Faults Causes
The displays 1. Defective fuse or missing phase
do not light on 2. Damaged fuse in electrical connection
switch-on 3. Damaged fuse in control/display panel
1 1. Setting and calibration data lost from PCB memory
2. One or more calibration operations (setting, calibra-
tion of electronic vernier caliper/gauge arm) not per-
formed
2 Wheel guard raised prior to completion of measurement
3 1. Backward rotation of wheel on start of measurement
2. Incorrect connection of motor
4 1. No motor operation, motor does not attain the neces-
sary speed
2. Fault in electrical connection
3. Fault in PCB
5 1. Balance weight not attached to wheel
2. Measurement sensors not correctly connected
6 1. Wheel guard not lowered
2. Damage to wheel guard safety switch
7 Excessive phase difference between the 2 measurement
sensors
8 Inner measurement sensor not correctly connected,
defective or open circuit in wire
9 Outer measurement sensor not correctly connected,
defective or open circuit in wire
10 1. Measurement sensor for position recognition defective
2. No motor operation
11 1. Measurement sensor for phase recognition defective
2. No motor operation
17 Weight outside setting range (weight required for
balancing is more than 250 g)
18 Wheel data not entered
19 Input signal of right measurement sensor
lower than that of left sensor
Robert Bosch GmbH
Faults | WBE 4420 | 41
Remedy
1. Check the mains connection.
2. Replace the fuse in the electrical connection.
3. Replace the fuse in the control/display panel. In-
form customer service.
Caution: Repeated fuse damage is an indication of a
malfunction.
Check and correct calibration and settings.
Wait for end of measurement before raising wheel
guard.
1. Check that wheel is stationary on starting and stop
it turning backwards on starting.
2. Check proper connection of motor.
1. Check mains voltage (probably too low).
2. Check electrical connection or power cord.
3. Replace the PCB.
1. Repeat calibration from the start and attach bal-
ance weight as specified by the process.
(refer to 12.3 ).
2. Check the connection of the measurement sensors.
1. Lower wheel guard with wheel attached.
2. Replace wheel guard switch.
1. Check for correct attachment of calibration weight.
2. Check machine connection; WBE 4420 probably
not stable and vibrating excessively.
3. Check contact between measurement sensor and
PCB.
4. Replace measurement sensor.
5. Replace PCB.
1. Check connection of left measurement sensor.
2. Replace measurement sensor.
1. Check connection of right measurement sensor.
2. Replace measurement sensor.
1. Check connection of light barrier PCB.
2. Check that the light barrier PCB is protected
against light and provide a cover if necessary.
3. If the fault persists, check and if necessary replace
the light barrier PCB.
4. Check the mains connection.
1. Check connection of light barrier PCB.
2. Make sure the light barrier PCB is protected
against light and provide a cover if necessary.
3. Check and if necessary replace the light barrier
PCB.
4. Check the mains connection.
1. Check whether the wheel is correctly attached to
the flange.
2. Determine the outer weight position (neverthe-
less), attach a 100 g weight and start a different
measurement.
Enter wheel data before performing measurement.
Interchange the connections of the two measurement
sensors.
1 695 655 424
en
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2010-04-30