PAC R6000S Operation Manual page 77

Symptom
Inaccurate Results,
Continued
Coking (Sooting)
Detector Module Will Not
Zero (auto zero light lit)
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Probable Cause
Abnormal ambient temp
change
Light leakage
Defective PMT or Cooler
Defective Pre-amp PCB or
Amplifier PCB
Gas leak
Incomplete sample
combustion
Gas leak
Detector is contaminated
Sample system is
contaminated
High-voltage is too high
Processor board is bad
Pre-Amp is bad
UV Lamp is not nulled
PMT is bad
Analog Power Supply is bad
R6000S Operation Manual: Rev. G
Corrective Action
Stabilize ambient temperature.
Use light leak test to find leaks
and repair as needed.
Replace PMT or Cooler.
Replace Pre-amp PCB or
Amplifier PCB.
Use gas leak test to find leaks
and repair as needed.
Ensure furnace temperature
and gas flows are correct.
Use gas leak test to find leaks
and repair as needed.
Inspect and clean as needed.
Clean sample system.
Use High Voltage Adjustment
procedure to check. Adjust as
needed.
If board will not zero with
signal input shorted, the
processor board is bad.
Replace with new Pre-Amp.
Use UV Lamp Nulling
procedure to check. Correct
as needed.
Check response with a new
PMT-Tube.
Measure the outputs of the
analog power supplies in the
detector enclosure and
detector interface module for
+15 volts,-15 volts, and +5
volts. Replace power supplies
as needed.
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