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5-5
Troubleshooting 5
Electrical
Electrical
Input functions not operating
• Make sure connections into terminal block
connector are secure.
• Make sure terminal block connector is secure in
input/output port.
• Check connections for proper pin assignments.
• Be sure pins from external devices are assigned
correctly.
• Check polarity of input. Inputs should be a
contact closure. If not, it must be TTL level
(logic 0 activates).
• Confirm that source supplying input to liquid
handler is working.
Output functions not operating
• Make sure connections into terminal block
connector are secure.
• Make sure terminal block connector is secure in
the input/output port.
• Check connections for proper pin assignments.
• Output from liquid handler should be compatible
with device to which it is interfaced. Outputs
are contact closures.