Communication Problems171Communication ProblemsMany host-printer communication problems are complex. With the exception of a defective interface cable, mostcommunications problems are not a result of a hardware failure. They usually result from an incompatible configuration of thehost computer system, network (LAN, print server, controller, multiplexer, etc.), or the printer. Sometimes the print applicationprogram itself is at fault.If you have limited communications background experience, and the cause of the problem is not readily apparent, do thefollowing:1. Print out the printer configuration.2. Verify that you have the latest level of code. If not, load the latest level of code.3. Obtain a copy of the Device Host Configuration if possible.4. Call your support group for assistance in problem analysis.If you cannot obtain support, or you have previous experience solving host-printer communications problems, the followingadditional information is provided.You can quickly check the ASCII portion of the printer logic by sending a plain text file from a PC to the printer via the parallel orserial port. For a description of each of the ASCII interfaces, refer to theUser’s Manual.Table 4. Common Communications ProblemsProblem Interface Common CausesPrinter “hangs” during print job Any 1. Reload the latest level of code (page 231).2. Replace the platen open switch.Fails to print from host-or-(go to the next page)parallel - Interface cable defective- Host/Network configuration- Printer logic- Terminating Resistors- Incorrect printer configuration. Refer customer to theUser’s Manual.
