LS SERIES SERVICE MANUAL
ISSUE 4.0 FAULT FINDING 5
SYMPTOM PROBABLE CAUSES AND ACTIONS
No change in load
as sample is
tested.
This can be caused by a damaged loadcell.
If possible, check the machine with another loadcell.
Check the Crosshead Loom for broken conductors.
Check that the ADC is converting an analogue voltage by
selecting the PC Diagnostic Mode. Press "v" to run the
voltage test and note the Loadcell Amplifier Output shown
in ch[7]. Apply a load to the loadcell, press "v" again and
check that the voltage has changed. If the voltage
changes, try re-calibrating the loadcell. If the voltage
does not change, replace the Main PCB.
Console display
indicates a
different value
loadcell than fitted
This can be caused by the Loadcell EEPROM being
erased. Note that an erased EEPROM will normally
display a message that a loadcell is not fitted.
If possible, check the machine with another loadcell.
Reprogram the loadcell using the diagnostic mode.
If the display still does not show the correct value, check
the +5V on pin 11 of the loadcell socket on the moving
crosshead.
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