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Diagnostics and Troubleshooting
General Troubleshooting Hints
Measurement Results Indicate Excessive Noise Over The Whole
Spectral Range
Ensure that the lamps are turned on when making measurements.
Measurements taken with both lamps off exhibit excessive noise over the
whole wavelength range. In addition, the self test (only Agilent ChemStation
software), lamp intensity, and stability diagnostics within the software can
aid in diagnosing problems within the optical system which contribute to
excessive noise. Causes and solutions for excessive noise over the whole
wavelength range are shown in Table 42.
Table 42 Excessive Noise Over Whole Wavelength Range
Possible Causes Action
Light path is blocked. Ensure that the light path is free and clear of
all obstructions
Cuvette or flow cell not installed correctly. Check and correct cell installation.
Air bubble sticking on the quartz window of
the flow cell.
Use cell cleaning fluid to passivate flow cell.
Source lens or spectrograph lenses dirty or
fogged.
Clean lenses.
Shutter not functioning or partly blocking
light.
Exchange shutter assembly.
Spectrophotometer data acqusition (SDA)
board may be defective.
Exchange SDA board.
Spectrophotometer lamp supply (SLS) board
may be defective.
Exchange SLS board.
Main power supply (MPS) may be defective. Exchange MPS.
Spectrograph electronics may be defective. Exchange the optical unit.
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