Tuttnauer 2540 EHS, Technician Manual

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82
Corrections
2.1
Replace DIG-T2 board
3.1
Replace DIG-T2 board.
4.1
Replace the keyboard.
4.2
Replace the DIG-T2 board.
5.1
Check that the Atmos.Press parameter (sec 8.2.17) is set to the correct atmospheric pressure.
5.2
The sensor is faulty. Replace sensor.
Possible cause check-up and tests
—
The voltage reading must be less than 5mV. A higher voltage may indicate that the ANL-T2 board fastening screws are loose or that the power supply grounding cable is loose.
2.1
If the other functions are OK, the display is probably damaged.
3.1
DIG-T2 board is faulty.
4.1
Keyboard is faulty.
4.2
DIG-T2 board is faulty.
5.1
Check if the displayed value is near the atmospheric pressure.
5.2
If after setting the Atmos.Press parameter the displayed value is significantly different from the atmospheric pressure there is a problem with the pressure sensor.
10. TROUBLESHOOTING (cont.)
10.3 Pre-process malfunction
(cont.)
Symptom
1. (cont.) 2.
System is on and display is not lit.
3.
System on and erroneous or fragmented digits.
4.
No response from one of the keys.
5.
The displayed readout for the atmospheric pressure, when the door of the chamber is open, does not conform to the actual absolute pressure.