Sirona DAC PROFESSIONAL, Service Manual

Page: 45 / 66

Fault Diagnosis DAC Professional
Fault 34: Sterilization TU
FAULT 34: Sterilization TU
Triggered by:
Temperature fell below the minimum level for the sterilization/disinfection during the period T1-T5 (measured at the
temperature sensor "Temp_chambr_elec“ at AIN1).
Cause / Remedy
Operating fault / Checks by personnel:
•
Load exceeds maximum level allowed
Appliance fault / Repair by technical service
►
No saturated steam pressure / Leaking
As a result of too much residual air in the autoclave chamber, the temperature is not high enough to allow
the generation of saturated steam.
Check using the print-out records:
Control pressure in record corresponds to control pressures P 6 – P10
Reading in record from temperature sensor "Temp_Chamber_Dis1/2" at Analog input AIN2 is also too low
(corresponds to the temperature of temperature sensor "Temp_chambr_elec" at analog input AIN1 (see
last line of record print-out.)
Carry out a vacuum test - if there is no leaking see under "Pressure sensor signal too high"
►
Temperature sensor "Temp_Kess_Prog"/ Analog input AIN1 measures too low
Check using the record print-out:
Print-out reading for control pressure corresponds to control pressures P 6 – P10
Print-out reading for temperature sensor "Temp_Chamber_Dis1/2“ at analog input corresponds with the
pressure required for saturated steam.
In order to determine whether the fault lies in the temperature sensor or the signal processing on the CPU-
board, proceed as follows:
Switch temperature sensors AIN1 and AIN2 and start the program again,
•
Program runs without
disturbance, (or with "Fault 27“ )
•
Temperature on print-out too low
to produce saturated steam?
Exchange temperature
sensor now on AIN2
(previously on AIN 1)
•
Fault 34 again
•
Does temperature reading on
print-out correspond with the
pressure to produce saturated
steam?
Signal processing on CPU-
board faulty,
Exchange CPU-board
09/21/2006 43/61 Servicemanual DAC Professional