3-40 | Model 931S / Model 932S UV Analyzers
Start-Up Diagnostic Checklist
This checklist describes problems that may be encountered while power-
ing up the analyzer and/or preparing it for normal operation. If the ana-
lyzer experiences problems during power-up, review this checklist and
perform the corresponding corrective action to fix any problems.
Problem Encountered
The LEDs for various analyzer operations are not operating properly, as de-
scribed in “Powering Up the Analyzer” in this chapter.
Corrective Action
Take appropriate safety precautions and check for proper I/O wiring and
power connections.
If the LEDs are still not operating properly, reset the analyzer by cycling the
AC power off a minimum of 15 seconds before cycling it on again.
Problem Encountered
One or both source lamps are not firing.
Corrective Action
Take appropriate safety precautions and check for proper wiring connections.
If the wiring is okay, check the lamp-socket connections. See “Source Lamp
Replacement” in Chapter 6 to make adjustments to the lamps. Perform an
Auto-Setup if necessary to ensure the lamps are operating at peak efficiency.
Problem Encountered
Temperature zone values do not increase.
Corrective Action
Take appropriate safety precautions and:
• Check the fuses for the temperature zones to ensure they have not
blown. These fuses are located on the AC Distribution board in the
Lower Enclosure (see Figure 3-20).
• Check the Over-Temp Switch on the Optical Bench Assembly (see
Figure 3-2). If the plunger has popped out, press it to reset it.
• Check for proper wiring terminations for the appropriate temperature
zone.
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