DMP 302 (26-2849)            Troubleshooting           Faxback Doc. # 4168


If the printer fails to operate properly, try these troubleshooting
suggestions. If you still cannot eliminate the problem, contact your local
Radio Shack store for assistance.
┌───────────────────────────────┬───────────────────────────────────────────┐
│  SYMPTOM                      │  CAUSE AND REMEDY                         │
├───────────────────────────────┼───────────────────────────────────────────┤
│The printer does not print.    │  * Power is not getting to the printer.   │
│The POWER indicator does not   │   -Be sure the power cord is securely     │
│light.                         │    connected and POWER is set to ON.      │
├───────────────────────────────┼───────────────────────────────────────────┤
│The printer does not print.    │  * The printer is off line.               │
│The POWER indicator lights.    │   -Press ON/OFF LINE until the ON/OFF     │
│                               │    line indicator lights.                 │
│                               │   -Be sure you have loaded paper.         │
│                               │  * The connection to the computer is not  │
│                               │    complete.                              │
│                               │   -Check the connection between the       │
│                               │    printer and the computer.              │
│                               │  * The ribbon cassette is not correctly   │
│                               │    installed.                             │
│                               │   -Install the ribbon cassette correctly. │
│                               │  * The Dip Switches are not set correctly.│
│                               │   -Recheck all settings. Printers with a  │
│                               │    serial and a parallel port are most    │
│                               │    likely to have the wrong interface     │
│                               │    enabled.                               │
├───────────────────────────────┼───────────────────────────────────────────┤
│The printer operates correctly,│  * The paper is jammed or not properly    │
│but the paper does not feed    │    loaded.                                │
│properly. On Line/Off Line     │   -Remove the paper and reinsert it       │
│indicator flashes.             │    correctly.                             │
├───────────────────────────────┼───────────────────────────────────────────┤
│The print is light or smeared, │  * The ribbon cassette is not properly    │
│or the ribbon is not feeding   │    installed.                             │
│properly.                      │   -Correctly install the ribbon cassette. │
│                               │                                           │
│                               │  * The ribbon is old or worn out.         │
│                               │   -Replace the old ribbon cassette with a │
│                               │    new one.                               │
│                               │                                           │
│                               │  * The print head position is not correct.│
│                               │   -Adjust the print-head gap to match the │
│                               │    paper thickness.                       │
├───────────────────────────────┼───────────────────────────────────────────┤
│The On Line/Off Line indicator │  * The printer is out of paper.           │
│flashes.                       │   -Load more paper. Then press ON/OFF LINE│
│                               │    until the ON/OFF LINE indicator lights.│
├───────────────────────────────┼───────────────────────────────────────────┤
│Erratic operation or wrong     │  * Check interface cable at printer and   │
│characters printing.           │    computer.                              │
│                               │   -If cable is worn or damaged replace.   │
│                               │   -If cable is loose or not connected,    │
│                               │    insert properly to the computer and    │
│                               │    printer.                               │
├───────────────────────────────┼───────────────────────────────────────────┤
│Printer suddenly starts        │  * The print head has over heated. (This  │
│printing unidirectional and    │    feature is designed to protect the     │
│then stops.  The On Line/Off   │    print head.)                           │
│line indicator is flashing.    │   -Wait for the print head to cool.       │
│                               │    Printing will resume automatically.    │
└───────────────────────────────┴───────────────────────────────────────────┘