Cause a): The blue and red twin air tubing that supply the cartridge and shuttle with air have been switched.
Solution a): Verify that the air hoses from the controller to the inker are connected properly:
- RED AIR TUBING connects to the ink cartridge and to the barbed fitting that is closest to the center of the controller connector.
- BLUE AIR TUBING connects to the shuttle connection on the shuttle mechanism and to the barbed fitting that is closest to the outside edge of the controller connector.
Cause b): Dot Size Potentiometer is defective.
Solution b): Run diagnostic test "B." Dot Size Potentiometer Test described in the controller maintenance section of the Operations Manual for your inker. If test results are not within parameters, contact Xandex Customer Service.
Cause c): If the dot size changes, but does not change sufficiently, the cartridge type is not correct.
Solution c): Three cartridge types are available for Xandex pneumatic inkers. You must select the cartridge type based on the inker model, ink type and dot size required. Cartridge types are A5, A6, and A8. Each has a different size Teflon tube and therefore, a different dot size range. Type A5 is capable of creating the smallest ink dots and type A8 the largest. For more information see Pneumatic Inking System Dot Size Specifications (PDF) to select a cartridge type to fit your requirements.
Cause d): Dot size knob set screw is loose, allowing the knob to turn without changing the dot size setting.
Solution d): Loosen the set screw sufficiently to remove the dot size knob from the potentiometer shaft. Turn the potentiometer shaft counterclockwise until it stops. Replace the dot size knob with the knob indicator set at MIN on the controller scale and tighten down the set screw. Perform potentiometer diagnostics as documented in the controller maintenance section of the Operations manual for your inker to verify potentiometer operation.