Check Of The Internal Pick-Up Sensor; Pick-Up Replacement Procedure; Encoder; Engine And Power Board - Bosch WBE 4420 Instrucciones De Reparacion

+
the stand-by value is half-way on the reading scale
(e.g. 8170 +/- 100);
+
by pushing the shaft downwards, the values
decreases to zero;
+
by lifting the shaft upwards, the value increases to
end scale.
4.1.3 Check of the internal pick-up sensor (IN1)
i
The sensor is now assembled in the other position.
During appliance check, verify that:
+
the stand-by value is half-way on the reading scale;
+
by pushing the shaft downwards, the values
increases to end scale;
+
by lifting the shaft upwards, the value decreases to
zero.
!
The piezo-electric sensors are identical and to
distinguish them, during production, a red pick-up is
assembled on the outside and a black on the inside.
4.1.4

Pick-up replacement procedure

1. Remove the weights protection, the protection on
the left side and the front protection;
2. disconnect the action-centre;
3. loosen the two fastening screws (Fig. 12, A) located
underneath the measurement unit;
4. using a 17 mm spanner completely loosen the
special screw underneath the pick-up (Fig. 12, B);
5. remove the pick-up sensor;
6. position the two balls (Fig. 12, C - D) on the new
sensor, using a layer of grease to help keep them in
position;
7. position the pick-up;
8. using a 17 mm spanner tighten the special screw
(Fig. 12, A) so that it is possible to manually rotate
the sensor with a slight force;
9. bring the pick-up sensor cable on the external side
of the measurement unit;
10. using a 17 mm spanner tighten until the cable
rotates by 180° or using a dynamometric wrench
apply a 6N force.
Robert Bosch GmbH
Repair procedures | WBE 4420 | 33
Fig. 12: Pick-up replacement procedure
4.2

Encoder

i
Indicates the function to directly check the step
counter (encoder): the number of spaces varies from
0 to 199.
i
The malfunctioning of the apparatus is automatically
detected by the program showing on the display "Err
10" or "Err 11".
€
By keeping the entry displayed on the board, check
which may be the cause of the fault to be able to
adequately solve the problem (see table below).
Fault Correction
The machine + Check that the disk is not obstructed
does not reach by dust.
200 spaces. Check that the disk is intact.
+
The machine + Check that the encoder is connected.
does not count + Replace the encoder.
any space.
4.3

Engine and power board

i
The functioning of the engine is completely managed
by the power board.
€
If the wheel does not turn listen if, by activating the
cycle, a "click" from the relays is emitted from the
power board.
Fault Correction
The wheel does + Check the electric connections.
not turn. + Replace the engine or the condensers.
The engine does + Check the tensioning of the
not reach the transmission belt.
balancing speed. + Replace the engine or the condensers.
The wheel does Check, and eventually replace, the
+
not brake (in power board.
reverse). + Check, and eventually replace, the CPU
board.
en
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1 695 655 424 2010-04-30