Filter/Grating Motor Test - Agilent Technologies 1220 Infinity II LC User Manual

Table 40
Cause
Lamp off.
Old lamp.
Absorbing solvent or air bubble in flow cell.
Dirty or contaminated flow cell.

Filter/Grating Motor Test

VWD Filter/Grating Test Description
The actual position of the filter motor and grating motor is defined as the
number of steps from the reference (sensor) positions. The VWD Filter/Grating
Test counts the number of motor steps required to move the filter motor and
grating motor back to the reference (sensor) position. If the number of steps
required to reach the reference positions are the same as the expected step
number, the test is passed. If a motor fails to move, or loses motor steps, the
test fails. The test evaluates the results automatically.
VWD Filter/Grating Test Results
Probable causes of test failure:
Table 41
Cause
Defective filter motor assembly.
Defective VWM board.
Table 42
Cause
Defective filter motor assembly.
Defective VWM board.
1220 Infinity II LC System User Manual
Probable causes of test failure
Filter Motor Test
Grating Motor Test
Test Functions and Calibration
Variable Wavelength Detector (VWD)
Corrective action
Switch on the lamp.
Exchange the lamp.
Ensure the flow cell is filled with water, and
free from air bubbles.
Run theCell Test. If the test fails, exchange the
flow cell windows ("VWD Cell Test
Description" on page 162).
Corrective action
Exchange the filter motor assembly.
Exchange the VWM board.
Corrective action
Exchange the filter motor assembly.
Exchange the VWM board.
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