Finger Guard Switch; Fault Repair; When Pressing The Foot Switch: Roller Rotates, No Heater Plate Function; Figure 020-3: Finger Guard - Miele B 890 Technical Information

B 890/B 990
2.2

Finger Guard Switch

The finger guard is the small lip in the front of the heater plate assembly that
can be lifted slightly. The finger guard switch is actuated if the finger guard is
lifted or moved from its regular position. This system ensures that, if the
operator should accidentally make contact with the heater plate while the
roller is turning, power is interrupted to prevent injuries.

Figure 020-3: Finger Guard

3

Fault Repair

3.1 When Pressing the Foot Switch: Roller Rotates, No Heater Plate
Function
Symptom:
After the foot switch is pressed, the roller rotates but the heater plate does
not move up or down.
Cause:
Microswitch defective.
Remedy:
1. Check the foot switch (2S26, 2S27).
2. Check the heater plate microswitch (S26, S27)
Cause:
The heater plate microswitch (S26, S27) is not adjusted correctly.
Remedy:
Adjust the heater plate microswitch (S26, S27) through the mounting hole.
Cause:
Weak plastic springs in the foot switch (2S26, 2S27).
Remedy:
After machine no. 46654842, additional springs were incorporated to increase
the strength of the plastic springs.
To increase the strength of the plastic springs, install an additional spring.
Cause:
Defective relay on main electronic.
23
Technical Information