Check Belt Tensioning; Replacement Easyfi X Calliper; Potentiometers; Diagnosis Distance Potentiometer(In2) - Bosch WBE 4420 Instrucciones De Reparacion

en 34 | WBE 4420 | Repair procedures
4.3.1

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).
4.4 Replacement Easyfix calliper
1. Remove the left side, the upper and front
protections;
2. disconnect the winder (Fig. 13, 1);
3. dismantle the external arm (Fig. 13, 5);
4. disconnect the electromagnet (Fig. 13, 4) and the
callipers cable (Fig. 13, F) on the interface board
(Fig. 13, 6);
5. remove the 3 support screws of the block (Fig. 13,
7);
6. remove and replace the calliper;
7. correctly align the block to the measuring bench;
8. re-assemble everything.
2
6
1
8
Fig. 13: Replacement Easyfi x calliper
4.5

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 potentiome-
ter, turn the head and check that, during the entire
run, the value is not blocked.
!
It is necessary to check the values of the
potentiometers when, during entering of the
measurements, the machine displays the
unacceptable values and, even after calibration of
the callipers, the problem is not solved.
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1 695 655 424 2010-04-30
3
4
F
5
7
9
4.5.1

Diagnosis distance potentiometer(IN2)

Fault
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
during the run.
4.5.2

Diagnosis width potentiometer(IN3)

Fault
The value remains blocked
at scale end or between 0
and 40.
The value remains blocked
between 100 and 16000.
4.5.3

Diagnosis diameter potentiometer (IN4)

Fault
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
during the run.
!
After having replaced the potentiometer or after having detected that the fastening screw is loose,
before proceeding with calibration, follow the
instructions reported here.
Correction
+ Check that the cable is
correctly 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).
Correction
+ Check that the cable is
correctly connected.
+ Check that the ring nut is
correctly fixed.
+ Replace the connection
cable.
+ Replace the potentiometer.
+ Check that the ring nut is
correctly fixed.
+ Replace the connection
cable.
+ Replace the potentiometer.
Correction
+ Check that the
potentiometer is correctly
fixed to the measurement
arm.
+ Replace the connection
cable.
+ Replace the potentiometer.
+ Check that the
potentiometer is correctly
fixed to the measurement
arm.
+ Replace the connection
cable.
+ Replace the potentiometer.
Re-position the potentiometer
(see following Instructions).
Robert Bosch GmbH