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errors, there may be a motor or driver fault (or, very unlikely, a
mechanical fault making the shaft difficult to rotate).
If position #1 cannot be located (the motor drives slowly as it
searches for position #1) then the most likely cause is a problem
with the optical encoder. There are two LEDs on the encoder
PCB. The green one is lit whenever the RMS is "on" an inlet.
The red LED indicates position #1 (i.e. both LEDs will be lit at
position #1). For ease of checking the functionality of the optical
sensors, the RMS can be rotated by hand: switch off the
controller, unplug the motor connector, and switch back on. If
there appears to be a problem, check that there is no dust around
the holes in the disc and around the optical transmitters /
receivers. If there is no activity, remove the screws fixing the
encoder disc to the pulley (note the orientation). Both LEDs now
should be lit. Slide a piece of paper between the optical
transmitters and receivers, and both LEDs should be off.
If it appears that the LEDs (and hence the optical sensors) are
working correctly, then the bracket holding these sensors may
need adjustment. Refit the encoder disc. Loosen the nuts holding
the bracket in place and adjust until both LEDs are on at position
#1 (Adjustment will affect the alignment of the sample arm with
the port. Remember that the arm position can be adjusted
slightly, as noted above). Switch off, reconnect the motor, and
switch on. Check that alignment is still OK when the motor is
driven. Check a selection of other ports.
Heating
If there is a reported fault, the following checks can be carried
out.
Main Heater
Warning!
Mains voltages present.
Switch off at the Inlet circuit breaker before removing the
inlet controller PCA cover or disconnecting any heaters.
Verify that the temperature readout is correct. Use an
independent temperature measurement if required. Check F1 on
the controller and then check that the controller is delivering
power to the heater connections on the controller (J18) (This may
not be a continuous supply if the controller is attempting to
control. See also
Prima PRO & Sentinel PRO Mass Spectrometers User Guide
"Main Body
Heater").
Technical Description: Inlet
Rapid Multi-Stream Sampler
C-13
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