8 • DP/SP Troubleshooting
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backpressure, replace the component. Replace as many components as
necessary to resume operation at the standard operating backpressure.
8.16 Vacuum Degassing Module Low Vacuum
• Leak in the vacuum degassing module
Check all tubing connections for leakage; tighten loose fitting connections.
8.17 Vacuum Degassing Module Does Not Run
• Electrical connections incorrectly installed
There may be a problem with the connections from the vacuum degassing
module to the CPU board. Contact Dionex for assistance.
NOTE The ICS-3000 Ion Chromatography System electronics
components cannot be serviced by the user.
8.18 DP/SP Digital I/O Port Inoperative
• TTL input-related error
1. The TTL input mode must match the signal type output by the device
connected to the pump. Check the user’s manual for the device to verify
that the correct signal type is selected.
2. A programming error occurred in the device sending the signal. Refer to
the user’s manual for the device for troubleshooting assistance.
• TTL/Relay output-related error
1. A programming error occurred in the device sending the signal. Refer to
the user’s manual for the device for troubleshooting assistance.
2. The device being triggered may require a TTL input, not a relay. Connect
the device to a pump TTL output.
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