Internal optics have become dirty
See Optics Block Cleaning for cleaning
details
Instrument has contamination on the optics
due to condensation or excessive loading
Clean instrument. See Optics Block
Cleaning.
Tubing from the pump inlet is not
connected to the outlet nozzle or tubing is
leaking (Model 9303).
Remove obstruction from inlet and/or re-
calibrate flow. If there is no flow or the
flow rate is too low, replace pump
assembly.
Reset laser power.
Check laser cable to detector board.
Replace laser assembly.
See Laser Replacement.
Laser is set at incorrect laser power or the
laser is damaged
Laser has become misaligned due to
excessive bumps or jolts
Detector board malfunction
Replace detector board. See Detector
Board Replacement.
Counts are too high or
cannot zero unit
Contamination in the optics chamber,
clean optics.
Deposits in the inlet—clean inlet and
check for dents on the inlet. If inlet is
dented, replace the inlet.
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