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978 is a left Ink Sump Full meaning the left ink sump on the left side of the printer is full. Note: A software counter monitors the usage of the ink sump. There are no sensors associated with the ink sump, so it may not actually be full.
1. Cycle printer on / off check result.
2. Push [Menu], select "List / Test Print" then push [#Enter] to print the System Summary.
3. Check the Total Counter reading of the System Summary.
4. Replace the left ink sump if necessary.