88 Agilent 1200 Preparative Pump User Manual
6 Troubleshooting and Diagnostics
Error Messages
Spurious Index
The pump motion control expects one (and only one) index signal for every
turn of the drive wheel. This error message is generated, if this signal is
received more often than within one complete turn of the drive wheel.
Encoder not Connected
There is an encoder wheel mounted to the shaft of the pump motor, that gives
pulses to the motion control according to the rotation of the shaft. The error
message is generated if the short bridge on the connector is not sensed.
Probable cause Suggested actions
1 Missing reflections to light switch because
of contamination on drive wheel.
Ensure the drive wheel is clean.
2 Defective Pump drive. Exchange the pump drive assembly.
3 Defective main board. Exchange the main board.
Probable cause Suggested actions
1 Defective or disconnected pump encoder
connector or cable.
Ensure the connector is clean, and seated
correctly.
2 Defective main board. Exchange main board.
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