Chapter 6 Control system diagram
SMSO-2-02.06- 15.07.03 231
6.5.43 Cup sensor 02.04.2002 .........
Serial no. 505124 .........
36V 5V DC
36V S
15V DC
Operating condition
When serving coffee the electrical circuit is closed if cup is present.
Symptoms
The cup sensor is not functioning, a cup is positioned in front of the sensor head
Procedure
NOTE: The LED on the sensor housing is lit up when a cup is positioned in front of the sensor head.
Process
step
Check Possible cause Remedy
1
Measure voltage at the unit con-
trol system output terminals
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 refrigerator
level sensor plug
Terminal 1, GND
15 V DC ?
Faulty cable / plug oxidised Replace cable / plug
3
Measure signal voltage at
terminals X15 4/7
15 V DC ?
Cup sensor faulty
Fibre optic cable faulty
Optocoupler faulty
Cable faulty
Replace cup sensor
NO
YES
YES
NO
NO
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