General Troubleshooting & Service Teledyne API T703/T703U Calibrator Operation Manual
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MOTHERBOARD 8.4.9.
A/D Functions 8.4.9.1.
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.
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