Wascomat EXSM 230 S, Руководство по эксплуатации и техническому обслуживанию

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67
Mechanical and electrical design
Level control
Description
The "level control", which is located on the circuit
board, is a pressure switch which monitors the
different water levels in the drum by sensing the
air pressure in a tube which is connected to the
bottom of the drum. As the water rises in the
drum, the air inside the tube is compressed and
at a set pressure ("cut-out-level") the micro-pro-
cessor cuts out water filing.
When the water is emptied from the drum the
microprocessor switches back to the starting
position again, but now at lower water levels than
were needed to switch when the drum was filling.
These levels are called "on-levels". If during a
wash the water should sink below on-level, the
machine will be filled with water again, to cut-out-
level.
Checking functioning and fault location
To be carried out by authorized personnel
only.
A faulty level control cannot be repaired. Instead
the whole circuit board must be replaced.
To check functioning of the level control
• Start the service program by pressing the
service button. Now certain of the buttons
switch to being number keys (1 to 9).
• Enter code 24. Now the display will show the
current level in the machine on a scale of 1 to
200. An empty machine should show a value
between 0 and 4.
• Press the START button. The machine will
start to fill.
• Check that the figure shown on the display is
counting upwards as the water level rises.
• After completing your check, stop filling by
pressing the START button.
• Enter code 21 and open the drain valve to
empty the machine.
• Quit the service program by pressing the ser-
vice button.
If machine is filling to a level which is too high:
• Check that the tube between the level control
and drum is not blocked. If necessary clean it
by disconnecting it at the level control end with
no water in the machine and blowing it clean.
• Check that the tube is undamaged.
• Test the machine by running a program.
Fig.
84
3400
3385
A
1
1
4
3
2
6
5
8
7
9
83
84
Fig.
83
Service switch