a) does not power up after pressing power key.

    ·change the batteries.

    b) does not power up after changing batteries.

    ·check if the batteries are properly installed with battery cap firmly closed.

    ·if problem persists, call for service.

    c) battery-low indicator is on,

    ·change the batteries.

    d) cannot download application program from the host to the cpt-711 portable data terminal or vice versa, via rs-232 port.

    ·check if the rs-232 cable is plugged tightly, then,

    ·check if host communication parameters (com port, baud rate, data bits, parity, stop bit) match the cpt-711 portable data terminal's.

    e) cannot download application program from the host to the cpt-711 portable data terminal or vice versa, via irda port.

    ·check if the irda transceiver tightly connected to host's com port, then

    ·check if host communication parameters (com port, baud rate, data bits, parity, stop bit) matched portable's.

    ·check if the cpt-711 portable data terminal is properly positioned within the reading range: (5 to 100cm, 30 degree solid angle) of the irda transceiver.

    f) keypad does not work properly,

    ·turn off the power then press the 7, 9 and power keys simultaneously to enter the kernel mode operation.

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

    ·perform the key-in test.

    ·if problem persists, call for service.

    g) scanner does not scan,

    ·check if symbologies used are enabled, or

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

    ·if problem persists, call for service.

    h) abnormal responses,

    ·open the battery cap and re-load the batteries.

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

    ·check if the cpt-711 portable data terminal can have a correct response by performing entering data.

    ·if problem persists, call for service.