Teledyne GFC-7000T - Trace CO2 Analyzer - manual - Manual (Page 271)

Troubleshooting Model GFC7000TA Carbon Dioxide Analyzer
Teledyne Analytical Instruments 253
11. Remove the one (1) screw fastening the GFC wheel/mask assembly to the GFC motor hub.
11
12
Figure 10-12: Removing the GFC Wheel
12. Remove the GFC wheel/mask assembly.
13. Follow the previous steps in reverse order to put the GFC wheel/motor assembly back together.
10.6.3. Disk-On-Module Replacement Procedure
NOTE
Servicing of circuit components requires electrostatic discharge protection, i.e. ESD grounding straps,
mats and containers. Failure to use ESD protection when working with electronic assemblies will void the
instrument warranty. Refer to Section 11 for more information on preventing ESD damage.
Replacing the Disk-on-Module (DOM) will cause loss of all DAS data; it may also 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 analyzer 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 analyzer parameters that may have been changed, such as range, auto-cal,
analog output, serial port and other settings before replacing the DOM.
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 analyzer, 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 standoff clip that mounts the DOM over the CPU board, and lift the DOM off
the CPU. Do not bend the connector pins.