Infratec™ 1241 Grain Analyzer
Service Manual 1001 5015 / Rev. 4 5:71
Detailed description
TWM shutter motors can cause I2C cable crosstalk noise resulting in that an
unexpected reset signal is sent to the Monochromator shutter. The reset signal
positions the monochromator shutter in "closed" position, which is the default state.
If it occurs during analysis then the light source may unexpected be blocked resulting
in displayed message "ERROR Reference scan light level is too low", i.e. no light
falling on the detector.
The cross cable talk originates in that the TWM shutter motor causes voltage spikes
generated from the inductive load. The cable crosstalk noise has been eliminated on
the TWM side by new revision of TWM PCB that has been updated with a capacitive
decoupling on the reset signal.
The updated TWM PCB (10012790) was implemented in production 2008-01-01.
Compatibility
It is not necessary to update existing TWM's or Infratec unless it shows the error
message described above.
Unaffected versions:
• Infratec 1241-001 model has sufficient motor drive protection
• Infratec 1241-002 model delivered after 2008-01-01, has updated HW that
provides improved motor drive protection (Ref. TN 1234)
• TWM 1241-050 delivered after 2008-01-01 is updated with HW described in
this TN.
Affected versions:
• Infratec 1241-002 model delivered prior 2008-01-01, to be updated with below
listed HW (Ref TN 1234):
- P/N 60023758 DSP Board
- P/N 60028013 Cable stalk Kit
• TWM 1241-050 delivered prior 2008-01-01 needs to be updated with TWM
PCB (10012790) as described in this TN.
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