a) does not power up after pressing power key.

    * make sure the batteries are loaded and check if the batteries are properly installed with battery cap firmly closed.

    * if it doesn't help, change the batteries and try again.

    * call for service if problem persists.

    b) cannot transmit data or programs via the terminal's communication port.

    * check if the cable is plugged tightly, then,

    * check if host communication parameters (com port, baud rate, data bits, parity, stop bit) match with the terminal's.

    c) keypad does not work properly,

    * turn off the power then press the 7, 9 and power keys simultaneously to enter the system menu.

    * from the system menu, select the test and then its sub-item kbd.

    * perform the key-in test.

    * if problem persists, call for service.

    d) scanner does not scan,

    * check if the barcode reader is enabled, or

    * check if battery-low indicator is shown on the lcd display. if yes, change the batteries.

    * if problem persists, call for service.

    e) abnormal responses,

    * open the battery cap and reload the batteries.

    * enter system menu by pressing 7, 9 and power keys simultaneously.

    * check if the terminal can have a correct response by performing tests.

    * if problem persists, call for service.