Chapter 6 Control system diagram
190 SMSO-2-02.06- 15.07.03
6.5.8 Drawer for coffee grounds –
limit switch
36V 5V DC
36V S L1, N
Operating condition
When the grounds container is pushed in, there is a signal present at plug X13 2.
Symptoms
No signal present when the grounds container is pushed in. „grounds container n. i. place” message displays. The 36VS electri-
cal circuit has been interrupted by the main relay.
Procedure
Process
step
Check Possible cause Remedy
1
Take voltage measurement at
plug X 13 3 on unit control sys-
tem:
36 V DC ?
Check the voltage supply (see
“Power PCB, control voltage”)
Voltage supply failure / faulty
2
Take voltage measurement at
terminals for right-hand holding
blade:
36 V DC ?
Plug contacts on unit control sys-
tem faulty / oxidised
Cable broken or pulled out of
terminal / plug
The switch is faulty
The switch is not sufficiently de-
pressed; grounds container not
fully pushed in
Faulty grounds container
Check / replace plug contacts
Replace cable or reinsert it into
the terminal
Replace the switch
Check the switch / grounds con-
tainer and adjust
Replace the grounds container
3
Take voltage measurement at plug
X 13 2 on unit control system:
36 V DC ?
Plug contacts on unit control sys-
tem faulty / oxidised
Cable broken or pulled out of
terminal / plug
Check / replace plug contacts
Replace cable or reinsert it into
the terminal
Restart the machine
If the “grounds container n. i.
place” message continues to
display:
Faulty unit control system
Replace unit control system
NO
YES
YES
NO
NO
YES
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