Thermo Scientific 49i Instruction Manual page 165

Thermo Fisher Scientific
Table 6-1. Troubleshooting - General Guide, continued
Malfunction Possible Cause
Lamp
Lamp heater
±15 volt power supply
Cell A or B noise Foreign material in one cell
excessive
Defective detector
Cell A and B noise Foreign material in
excessive
cells
Lamp failure
±15 volt power supply
Pressure transducer Pressure transducer
does not hold
calibration
Output signal Recorder
noisy
Sample is varying
Foreign material in cell
Sticky solenoid valve
Analyzer does not Leak
calibrate properly
Contaminated scrubber
Pressure transducer out of
calibration
Troubleshooting
Troubleshooting Guides
Action
Remove one cell and look for
blue light in hole of input
block
Check lamp temperature.
From the Diagnostics menu
choose Temperatures.
Check ±15 volts. From the
Diagnostics menu choose
Voltages.
Clean cell.
Interchange detectors at
Measurement Interface
Board connectors to
determine if detector is
defective.
Clean cells
Check for 1.7 volt peak to
peak waveform at lamp
current check point on Lamp
Power Supply Board
Check ±15 volts. From the
Diagnostics menu choose
Voltages.
Replace pressure transducer
Replace or repair recorder
Run instrument on stable
ozone source. If quiet, no
malfunction.
Clean cell
Replace with known good
solenoid valve.
Perform leak test
Perform scrubber efficiency
test. Replace if necessary.
Recalibrate pressure
transducer
Model 49i Instruction Manual 6-3