Bail9Lift9Mechanism Failure
Normal Bail!Lift Sequence
The following is what should happen during a normal bail9lift sequence:
The cartridge carriage positions over the engagement lever. This connects the auto9lift mechanism to the drive9roller gear. The media motor becomes the driving force for the auto9lift.
The media motor drives the drive roller, which in turn drives the bail auto9lift. The bail begins raising up until the •UP" position is reached.
The carriage moves away from the engagement lever so that the media may be driven by the drive roller without affecting the position of the bail. (The bail is kept in the up position by the left bail arm resting in the notch on the gear cam.)
4After the media is moved forward, the carriage again positions over the engagement lever. The media motor then drives the bail auto9lift and the bail lowers to the down position.
When the bail is down, it presses on the bail sensor switch. This is how the plotter knows the position of the bail.
Problems
DThe cam gear and engaging gear detach from the drive9roller gear even though the carriage is still actuating the engaging lever. This can happen due to excessive part tolerances or wear.
DThe engaging lever spring is installed on the lower rung of the Y9drive bracket, creating too much spring tension. Excessive spring tension accentuates any looseness in the bail lift parts. Install the spring on the upper rung.
DThe carriage does not properly locate the engagement lever, preventing the gears from engaging. Any problems with the carriage9motor control system (for example, the encoder strip) or associated mechanics could cause this problem. Also, if the carriage cannot find the true left stop during initialization (caused by interference), the engaging lever cannot be located. Possible causes of interference are the service9station sled and the main tensioner bracket.
DThe bail falls from the up position. This can result if the cam is over or under9rotated. The notch on the cam, used to catch the left bail bracket, is not properly located for the •bail up" condition, and the bail falls abruptly. A bail calibration may correct this problem.
Teflon Washers versus Cam!Gear Support
Problems can arise if the lift mechanism is too loose or too tight. The solution in the DesignJet 200 involved the use of teflon washers. A new solution comes with the introduction of the DesignJet 220 and involves a new part called the cam9gear support. (Details chapter 9, w New BailLiftMechanism Support.)
8914 Troubleshooting | C3187990000 |