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Teledyne API T703/T703U Calibrator Operation Manual General Troubleshooting & Service
177
8.4.9. MOTHERBOARD
8.4.9.1. A/D Functions
The simplest method to check the operation of the A-to-D converter on the motherboard
is to use the Signal I/O function under the DIAG menu to check the two A/D reference
voltages and input signals that can be easily measured with a voltmeter.
1. Use the Signal I/O function (See Section 8.1.3 and Appendix A) to view the value of
REF_4096_MV and REF_GND. If both are within 3 mV of nominal (4096 and 0), and
are stable, ±0.5 mV then the basic A/D is functioning properly. If not then the
motherboard is bad.
2. Choose a parameter in the Signal I/O function such as PHOTO_LAMP_DRIVE,
O3_GEN_TEMP or PHOTO_FLOW.
Compare these voltages at their origin (see the interconnect drawing and
interconnect list in Appendix D) with the voltage displayed through the signal I/O
function.
If the wiring is intact but there is a large difference between the measured and
displayed voltage (±10 mV) then the motherboard is bad.
07223C DCN6572