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Teledyne API Model 401 O
3
Photometric Calibrator Instruction Manual, 01124, Rev. J2
Chassis Temperature
Turn the analyzer off and remove the DC Power Supply Board. Measure across Motherboard J21
pins A30 and C30.
If thermistor resistance(s) are within the proper range, check the temperature linearization
circuits on the DC Power Supply Board as described in Section 9.6.4.
If temperature sensor readings appear accurate but control temperatures are not being maintained
at their proper value, check the operation of the heaters as follows:
1. Observe the indicator LED's on the Power Supply Module and confirm that the red (right-
most) LED is lit, and that the "CEL HTR" and "O3 GEN HTR" LED's are lit or cycling
(turning off and on). If these indicators are not correct, it is probably that the Power Supply
Module, or the V/F Board is at fault. Check as described in Sections 9.2 and 9.6.3.
2. Unplug the heater element from Power Supply Module and confirm that 115VAC is present.
If 115VAC is present, the heater element has failed and should be replaced.
WARNING
Hazardous voltage present - use caution.
9.6.3 Checking The V/F Card
A schematic and physical diagram of the V/F card are shown on Drawings 00514 and 00515 in
Appendix D. Proper operation of the V/F board can be confirmed by performing an ADC
calibration procedure as described in Section 8.2. If this calibration procedure can be performed
correctly, it is probable that the V/F card is functioning properly. If the V/F does not function
properly, check the following:
1. Confirm the presence of appropriate power by checking for:
+5V between TP 4 and TP 5
+15V at TP 1 and TP 3
-15V at TP 2 and TP 3
If any of these voltages are incorrect, check the DC Power Supply as described in Section 9.6.4.
NOTE
Do not disconnect CPU or other digital cards while under power.
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