Chapter 6 Control system diagram
SMSO-2-02.06- 15.07.03 229
6.5.41 Refrigerator, level sensor ......... 01.04.2002
......... Serial no. 505123
36V 5V DC
36V S
15V DC
Operating condition
The level sensor monitors the level of milk in the refrigerator and a “milk empty” message appears if there is not enough milk in
the milk container. When the “milk empty” message appears
Products can be served if enabled.
Products cannot be served if disabled.
Symptoms
The level sensor is not functioning, but the milk container is full.
Procedure
Except for the supply voltage, it is not possible to obtain any meaningful measurements on the refrigerator level sen-
sor with a multimeter, either in normal operation or in the case of a fault.
Process
step
Check Possible cause Remedy
1
Measure voltage at plug X9 on
power PCB:
15 V DC ?
Check the voltage supply (see
“Power PCB, control voltage”)
Replace unit control system
Voltage supply failure / faulty
Faulty unit control system
2
Measure voltage at plug-in con-
nection between machine and
refrigerator (terminals 1,2):
15 V DC ?
Plug contacts faulty / oxidised
Cable broken or pulled out of plug
Check / replace plug contacts
Replace cable
Check the installation of the level
sensor, make sure the milk con-
tainer is correctly installed; the
“milk empty” message disappears.
Level sensor dirty
Level sensor faulty
Clean the head of the level sensor
Replace the level probe
NO
YES
NO
YES
NO
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