Sirona DAC PROFESSIONAL, Руководство по обслуживанию

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Fault-diagnosis DAC Professional
Fault 27: temp. Sens.def 1,2
FAULT 27 Temp.Sens.def 1,2
Triggered by :
The maximum permissible deviation D3 (value x 0.1 in °C) between the two temperature sensors "
"Temp_chambr_elec" on AIN1 and "Temp_chamber_Dis1/2“ on AIN2 was exceeded.
Causes/ Remedy
Operating fault / Check by the personnel:
Appliance fault / Repair by technical service personnel
►
Temperature sensor AIN 1 or AIN 2/ Signal processing on AIN1 or AIN2 faulty
Clarification with the help of the print-out record
If at the time of the malfunction the temperature and pressure values of the print-out correspond to values
for saturated steam, then it can be assumed that the temperature measurement at AIN2 is accurate. The
cause of the malfunction is therefore probably a faulty temperature measurement at Analog input AIN 1:
•
Temperature sensor "Temp_chambr_elec“ at AIN1 faulty
•
Fault in signal processing at AIN1 (AD-converter on CPU board).
Exchange temperature sensors on AIN1 and AIN2 and restart the program,
If the temperature and pressure values on the print-out at the time of the malfunction correspond
to the values for saturated steam then it can be assumed that the temperature sensor from AIN 1
(now in Analog input AIN2) is measuring properly, so that the malfunction is due to the faulty
signal processing on the AIN 1: exchange CPU-board.
If there is a deviation from the values for saturated steam, then the fault lies in the temperature
sensor originally in AIN1 (now in AIN2): exchange this sensor.
However, if the print-out shows a deviation from the values of pressure and temperature for saturated
steam, then the fault lies with the temperature measurements from the analog input AIN2:
•
Temperature sensor " Temp_chambr_elec“ at AIN2 faulty
•
Faulty signal processing at AIN2 (AD-converter on the CPU-board)
Exchange temperature sensor on AIN2 with AIN1 and start the program,
If the temperature and pressure values now correspond to the values for saturated steam, then
the temperature sensor originally at AIN2 (now in AIN 1) is faulty: exchange the relevant sensor
If there is still a deviation of temperature and pressure values in the print-out from the values for
saturated steam, then it can be assumed that sensor originally at AIN 2 (now in Analog Input AIN
1) did not give an incorrect temperature measurement, so that the fault lies in the incorrect signal
processing at AIN 2: Exchange CPU-board.
AIN1
AIN2
09/21/2006 37/61 Servicemanual DAC Professional