User`s guide

User’s Guide ______________________________________________________________________
138 __________________________________________________________________M210662EN-A
4. Remove the lower body assembly by pulling it straight outwards.
5. Loosen the spacer screws with a 7-mm tool and disconnect the
heating element outlet.
6. Remove the printed circuit board including the opto-coupler.
7. Loosen the fixing screw of the chopper disc with a 2-mm Allen key
and remove the chopper disc.
8. Remove the external retaining ring (using narrow-pointed pliers).
9. Remove the spacer ring.
10. Remove the internal retaining ring at the bottom of the shaft (using
narrow-pointed pliers).
11. Remove the lower bearing.
12. Push out the shaft downwards through the upper body.
13. Remove the top bearing after pulling out the shaft.
To reassemble the sensor, reverse the above work order . The numbers
in parenthesis refer to Figure 110 on page 140.
1. Take the previous steps in opposite order until assembling the
chopper disc.
2. Attach the chopper disc (7) back onto the shaft. The disc has to be
positioned so that the disc teeth do not touch the opto-coupler (6)
on the circuit board. Tighten the screw.
3. Attach the heating element outlet (5) to the circuit board. Put the
circuit board in place and fasten it with spacers (5).
4. Put the lower body assembly (4) carefully into place. Fasten the
three screws (3) at the bottom of the sensor. Make sure that the
bigger O-ring (14) is correctly positioned between the upper and
CAUTION
Do not twist or bend the connector. This may break the pins.
NOTE
Be careful when handling the new ball bearings. Do not drop them or
force them onto the shaft.
CAUTION
Assure that the chopper disc teeth do not touch the opto-coupler. There
should be from 1 to 2 mm space between the bottom of the opto-
coupler and the disc teeth.