58300000111195_ARA_en_f.doc – 02.06.09 Seite 94 von 102
7.5.3 Grinding unit is not functioning
Fault description:
Grinding unit is not running
Possible faults:
1. No control signal voltage from logic module
2. No voltage at power module grinding unit output
3. No voltage on the grinding unit
Troubleshooting:
1. Check control signal voltage from logic module
First check whether the logic module is relaying the signal required for
actuation of the grinding unit to the power module. To do this, open
the appliance. Using the Torx T10 screwdriver, unscrew all rear panel
screws and remove the rear panel. Remove upper appliance cover to
the rear. Remove both side panels upwards.
The control signal voltage can be measured on plug CM9 on terminals
1 = GND (brown) and 5 = 5 VDC (green). The grinding unit must be
actuated by a coffee brewing process.
► No signal voltage
→
Logic module or connecting cable
defective
► Voltage available → see Point 2
2. Check voltage on power module grinding unit output
The voltage for the grinding unit is measured on plug CP5 on
terminals 3 = GND (black) and 2 = 230 VDC (transparent). The
grinding unit must be actuated by a coffee brewing process.
► No voltage → defective power module
► Voltage available → see Point 3
3. Check voltage on grinding unit
The operating voltage for the grinding unit is measured on the
connecting plugs of the grinding unit. (Black = GND, transparent =
230 VDC). The grinding unit must be actuated by a coffee brewing
process.
► No voltage → defective wiring, interrupted VHF-filters,
actuated temperature limiter
► Voltage available → defective grinding unit
To Next Page
Loading...
