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Teledyne API T703/T703U Calibrator Operation Manual General Troubleshooting & Service
189
8.7.2. DISK-ON-MODULE REPLACEMENT PROCEDURE
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.
See Section 10 for more information on preventing ESD damage.
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.
07223C DCN6572