Repair work at electric and electronic components
8.4 Checking and replacing the main switch (-1S1) and the humidity
switch (-8S1)
Spare parts:
Rocker switch (2W) 230VAC (order no. 5019-0010)
Necessary tools
Crosstip screwdriver, size 2
Continuity checker or multimeter measuring device
1.
Disconnect the unit from the power supply.
2.
Remove the housing cover on the lower front (chap. 5.1).
3.
Mark the connection position of each connector at the corresponding switch (B; C).
4.
Pull off the contactors from the connections of the corresponding switch.
5.
Set the switch to be tested to ON.
6.
With the main switch, test the continuity between the connections 1A and 2A and between the
connections 4B and 5B. With the humidity switch, test in addition also the continuity between the
connections 3A and 2A and between 6B and 5B.
7.
For replacing press together the four clips of the switch and push the switch forward out of the lateral
control panel (D).
8.
Install the new switch by following steps 1 to 7 in reverse order.
B
C
D
A
E
Figure 36: Checking and replacing the main switch (-1S1 ) and the humidity switch (-8S1 )
A
Interface RS422
B
Main switch (-
1S1
)
C
Humidity switch (-
8S1
)
D
Right lateral control panel
E
Socket RJ45
Service Manual KBF (E5.2) 04-2015
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