Topic or Information
Printer prints garbage or unreadable text
The printer produces unreadable text. The most common cause of printing unreadable text is that you use the serial interface, and that the handshaking is not set up in the same way on the PC and in the printer.
1) Print a Self-test and look at the flow control parameter.
2) Compare with the manual for the printer model you use to see if the setting corresponds to Hardware, or XON/XOFF handshaking.
3) In the control panel of your PC, or in the setup dialogue of your application program, set it up for Hardware handshaking or XON/XOFF handshaking. The default setting in Windows is often "None" and will not work on longer text printouts.
Problems often occur when the buffer in the printer is full, the printer signals to the PC that it can not process more data, and stops sending data. If handshaking is set incorrectly the PC disregards this and continues to send data. That part of the data disappears, and may contain control codes that tell the printer what to do. When the printer buffer has free space again the printer starts to receive data. This data is printed out as characters although it is graphics data that it receives the printout may be unreadable and may contain many cut commands etc.