Check Of The External Pick-Up Sensor (In0); 10.2.3 Check Of The Internal Pick-Up Sensor 50 (In1) 50 10.3 Encoder; Engine And Power Board; Check Belt Tensioning - Bosch WBE 4120 Instructions De Réparation

10.2.2

Check of the external pick-up sensor (IN0)

i
The piezo-electric type sensor reads a force variati-
on.
During appliance check, verify that:
+
the stand-by value is half-way on the reading scale
(e.g. 8170 +/- 100);
+
by pushing the shaft downwards, the values decrea-
ses to zero;
+
by lifting the shaft upwards, the value increases to
end scale.
10.2.3 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 increa-
ses to end scale;
+
by lifting the shaft upwards, the value decreases to
zero.
!
The piezo-electric sensors are identical and to dis-
tinguish them, during production, a red pick-up is
assembled on the outside and a black on the inside.
10.3 Encoder
i
Indicates the function to directly check the step
counter (encoder): the number of spaces varies
from 0 to 255.
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).
Difetto Correzione
The machine + Check that the disk is not obstructed
does not reach by dust.
255 spaces. Check that the disk is intact.
+
The machine + Check that the encoder is connected.
does not count Replace the encoder.
+
any space.
Bosch Automotive Service Solutions GmbH
Diagnostics | WBE 4120 / WBE 4120 D / WBE 4120 DT | 63
10.4

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..
Difetto
The wheel does
not turn.
The engine does
not reach the ba-
lancing speed
The wheel does
not brake (in re-
verse).
10.4.1

Check belt tensioning

To check the tensioning of the transmission belt, use
the tensiometer for optibelt TT mini S belts (nominal
value: 120 ±10 Hz).
10.5

Potentiometers

i
The potentiometer used is of multiturn type, where
the shaft must fulfil more than one turn to go from
one end of the run to the other.
€
To check the correct functioning of the
potentiometer, turn the head and check that, during
the entire run, the value is not blocked.
!
It is necessary to check the values of the potentio-
meters when, during entering of the measurements,
the machine displays the unacceptable values and,
even after calibration of the callipers, the problem is
not solved.
10.5.1 Diagnosis distance potentiometer(IN2)
Difetto
The value remains blocked
at scale end or between 0
and 40.
The value remains blocked
between 100 and 16000.
The values passes from 0 du-
ring the run.
Correzione
+ Check the electric connections.
+ Replace the engine or the condensers.
+ Check the tensioning of the transmissi-
on belt.
+ Replace the engine or the condensers.
+ Check, and eventually replace, the po-
wer board.
+ Check, and eventually replace, the CPU
board.
Correzione
Check that the cable is cor-
+
rectly connected.
+ Check that the steel cable is
in its seat and is not cut.
+ Replace the connection
cable.
+ Replace the potentiometer.
+ Check that the ring nut is
correctly fixed.
+ Replace the connection
cable.
Sostituire il potenziometro.
+
Re-position the potentiometer
(see following Instructions).
1 695 600 579
en
|
2016-08-02