Plotter does not recognize print head is installed or hangs on initialization.

Plotter displays one of the following: 

                  THE HEAD IS ACCESSIBLE NOW
                  PLEASE INSTALL PRINT HEAD

or, plotter will not complete initialization on power-up.


A.    If one of the above condition occurs after a print head/ink cartridge 
      has already been installed, perform the following:

      1.   Move the carriage assembly area to the exchange position by 
           perfoming the following steps:

           a.   With the plotter power on and the plotter displays either:
                ONLINE or UNLOADED, press the MENU button until the plotter
                displays: MANUAL.

           b.   Press the left arrow key on the plotter. The carriage assembly
                will move to the exchange position.

      2.   Inspect the electrical contact points of the print cartridge. 
           Perform the following:

           a.   Lift the Cartridge Locking Lever on the carriage assembly 
                and remove the print head/ink cartridge.

           b.   Turn off the plotter power.

           c.   With a cotton swab moistened with isopropyl alcohol, 
                clean the print head electrical contacts located on the 
                carriage assembly. 
                
                Also, clean the print head electrical contacts located on 
                the print head.

           d.   Reinstall the print head into the carriage assembly, and
                lower the Cartridge Locking Lever on the carriage assembly.

                Note: The Cartridge Locking Assembly should operate freely. 
                If it binds or offers resistance, the print head may not be 
                installed correctly. 

                i.   The print head should be positioned with the electrical
                     contacts of the print head on the lower right side. 

                ii.  The indention on the right side of the print head is 
                     to be placed on the gray mounting rod on the carriage 
                     assembly.

                iii. Press lightly on the middle of the print head to seat
                     the print head in the carriage assembly and slowly
                     lower the Cartridge Locking Lever to lock the print head
                     in place. 
                     
           e.   Turn on the power to the plotter. 

           f.   If the plotter still displays an error, then there may be 
                a problem with that particular print head.

                i.    Check by replacing the print head with another one.

           g.   If the problem is still not resolved, the plotter requires 
                service.