Fault diagnosis DAC Professional
Fault 22: Overheating preheating
FAULT 22: Overheating of preheating
Triggered by:
The limit value for the preheating-temperature T10 was exceeded
Causes / Remedy
Operating faults / Checks by personnel:
Appliance fault / Repair by technical service personnel
►
Control of Pre-heating Output ACOUT2 faulty
At output ACOUT2 there is a permanent voltage (although LED off), i.e. semiconductor relay faulty,
exchange CPU board
►
Temperature sensor Pre-heating faulty
Temp.-sensor Preheating measurements too high/fluctuating, in the " Diagnosis Program" check the
analog input AIN4 during a program by pressing the button " - ".
Exchange temperature sensor
►
Signal processing at analog input AIN4 faulty
Exchange CPU-board
Until a repair, it is possible to temporarily deactivate the preheating and the malfunction message by
setting the FLAG F5=0, and in addition if the output ACOUT2 is defective, disconnect the contacts to the
pre-heating from the output.
Temp.-sensor "Preheating" AIN4
Under the chamber insulation, stuck
directly on the heating
09/21/2006
35/61
Servicemanual DAC Professional
Summary of Contents for DAC PROFESSIONAL
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Page 7: ...Figure 4 Back view 09 21 2006 5 61 Servicemanual DAC Professional...
Page 56: ...Sirona DAC Professional Process 09 21 2006 54 61 Servicemanual DAC Professional...
Page 60: ...Valve diagram 09 21 2006 58 61 Servicemanual DAC Professional...
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