Teledyne API T703/T703U Calibrator Operation Manual General Troubleshooting & Service
179
NOTE
Printed circuit assemblies (PCAs) are sensitive to electro-static discharges too small to be felt by
the human nervous system. Failure to use ESD protection when working with electronic
assemblies will void the instrument warranty.
For more information on preventing ESD damage see A Primer on Electro-Static Discharge; the
manual can be downloaded from our website at http://www.teledyne-api.com under Help Center >
Product Manuals in the Special Manuals section.
Replacing the Disk-on-Module (DOM) will cause loss of all DAS data; it also
may cause loss of some instrument configuration parameters unless the
replacement DOM carries the exact same firmware version. Whenever changing
the version of installed software, the memory must be reset. Failure to ensure that
memory is reset can cause the instrument to malfunction, and invalidate
measurements.
After the memory is reset, the A/D converter must be re-calibrated, and all
information collected in Step 1 below must be re-entered before the instrument
will function correctly. Also, zero and span calibration should be performed.
1. Document all instrument parameters that may have been changed, such as
range, auto-cal, analog output, serial port and other settings before replacing
the DOM. (You will need this information to re-enter at the end of this
procedure).
2. Turn off power to the instrument, fold down the rear panel by loosening the
mounting screws.
3. When looking at the electronic circuits from the back of the instrument, locate
the Disk-on-Module in the right most socket of the CPU board.
4. The DOM should carry a label with firmware revision, date and initials of the
programmer.
5. Remove the nylon fastener that mounts the DOM over the CPU board, and
lift the DOM off the CPU. Do not bend the connector pins.
6. Install the new Disk-on-Module, making sure the notch at the end of the chip
matches the notch in the socket.
7. It may be necessary to straighten the pins somewhat to fit them into the
socket. Press the DOM all the way in and reinsert the offset clip.
8. Close the rear panel and turn on power to the machine.
9. If the replacement DOM carries a firmware revision, re-enter all of the setup
information.
10. Recalibrate A/D converter, and conduct a Zero and Span calibration as well.
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