Bosch WBE 4120 Instandsetzungsanleitung Seite 54

Auto-diagnosis menu(WBE 4120 /WBE 4120 D) | WBE 4120 / WBE 4120 D / WBE 4120 DT | 55
6.4.4 A5
Signal of the potentiometer of the distance.
The potentiometer that we use is a multiturn potenti-
ometer which means that the shaft must make more
than a single turn to go to the other side of the stroke.
In order to check the correct functioning of the poten-
tiometer, pull out the gauge and check that during the
stroke the value does not get blocked.
NOTES FOR THE ASSISTANCE:
You need to check the values of the potentiometers
when you insert the measures and the machine shows
unacceptable values and when the problem persists
even after the calibration.
Defect
The value is blocked either
at the end of the scale or be-
tween 0 and 40.
The value is blocked between
100 and 1000.
The value starts from ex.600
and blocks at the end of the
scale.
After substituting the potentiometer or after loosing the
locking screw, follow the instructions before moving on
to the calibration.
Procedure of positioning the distance potentiometer:
€
Remove the carter without disconnecting the board;
€
Start the machine;
€
Enter the test menu:
« Press "SET" until the notice "TST" appears and
then press "MM/INCH";
« press "SET" until the notice "A0" appears";
« press + DISTANCE until the notice "A5" appears;
€
Keep the value of the board shown and unblock the
screw on the locknut (A);
€
Now keep the gauge in rest and turn the potentiom-
eter (B) as far as the value of 200 ± 50;
€
Block the locking screw;
€
Check the correct functioning during the stroke;
€
Close the machine;
€
Proceed with the calibration of gauges (chapter 7)
Bosch Automotive Service Solutions GmbH
Correction
+ Check that the cable is prop-
erly connected.
Substitute the connection
+
cable (code 654085).
+ Substitute the potentiometer
(code 654107).
+ Check that the locknut is
properly fixed.
+ Substitute the connection
cable (code 654085).
+ Substitute the potentiometer
(cod. 654107).
Reposition the potentiometer.
(See the following Instructions).
6.4.5 A7
Signal of the diameter potentiometer.
In order to check the correct functioning of the potenti-
ometer, turn the gauge and verify that during the entire
stroke the value is not blocked and does not touch zero.
NOTES FOR THE ASSISTANCE:
You need to check the values of the potentiometers
when you insert the measures and the machine shows
unacceptable values and when the problem persists
even after the calibration.
!
NOTE: if, by chance, the nut looses and the potenti-
ometer disconnects from the shaft, the machine will
no longer read any measure because the carriage of
the potentiometer remains at the end of the stroke.
So, follow the instructions for "positioning diameter
potentiometer".
Defect
The value is blocked either
at the end of the scale or be-
tween 0 and 40.
The value touches zero during
the stroke of the gauge.
Procedure of positioning the diameter potentiometer:
€
Remove the carter without disconnecting the board;
€
Start the machine;
€
Enter the test menu:
« Press "SET" until the notice "TST" appears and
then press "MM/INCH";
« press "SET" until the notice "A0" appears ";
« press + DISTANCE until the notice "A7" appears;
€
Keep the value of the board shown and unblock the
nut (A) on the shaft;
€
Now keep the gauge in rest and turn the potentiom-
eter as far as the value of 200 ± 50;
€
Block the locking screw;
€
Check the correct functioning during the stroke;
€
Close the machine;
€
Proceed with the calibration of gauges (chapter 7)
en
Correction
+ Check that the cable is prop-
erly connected.
+ Substitute the connection
cable. (code 654085).
Substitute the potentiometer
+
group. (code 654107).
Reposition the potentiometer.
(See the following Instructions).
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1 695 600 579 2016-08-02