Manual

Troubleshooting 47
Dispensing Head
Table 6-3 Dispensing Head Troubleshooting
Symptom Possible Cause Recovery
1. No system power.
See System Power recovery
procedures (Table 6-1).
2. Servo amps failed
3. +48V power supply down
4. Limits not cleared
Contact a service technician.
No XYZ-Axis Dispensing
Head Motion
5. Home/Limit cable disconnected Connect Cable.
1. Home PCA damaged Replace PCA.
2. Home flag not positioned
properly
Contact a service technician.
Dispense Head Fails to
Find Home
3. Obstruction preventing machine
motion.
Remove obstruction.
1. Fatal following error
2. Cable pulley loose
Dispense Head Starts
To Move, Stops And
Goes Open Loop
3. Amp inhibit (voltage, current,
hall, temp)
Contact a service technician.
Jerky Movement
Mechanical interference along X
Y or Z axis.
Visually inspect the axis for anything
that may be restricting movement.
1. Height Sensor has been
adjusted or is loose.
Dispenses at Wrong Z-
axis Position
2. Nozzle/needle has been
changed.
Perform a Valve Offsets or Calculate
Master Offsets routine in FmNT. For
assistance, refer to the FmNT User
Guide or FmNT Online Help.
Height Sensor
Table 6-4 Height Sensor Troubleshooting
Symptom Possible Cause Recovery
1. Probe damaged Check for bent probe.
Probe Does Not Drop or
Retract
2. No Air Pressure Verify Main Air Pressure is ON.
Needle Hits Substrate
Probe tip is lower than the needle tip
when valve is in dispensing position.
Perform Valve Offsets or Calculate
Master Offsets in FmNT.