Vivitar ViviCam 3720 Guía Del Usuario

6-1 Camera will not turn on
1. Battery is not properly installed- remove and reinstall the batteries.
2. Insufficient  battery voltage-  Do not use old  batteries or batteries 
    with mixed battery life. It is  not recommended to  use rechargeable
    batteries with lower  voltage.

6-2 Flash will not fire
1. Flash set to OFF -Set the flash to Auto or On.
2. Flash has  not been fully charged  The flash takes a  few seconds
    to charge up while the Operation  LED is blinking. Flash light is 
   fully charged when the Operation LED turns off.
3. Battery level is low - When the battery indicator does not show a 
    fully charged battery, the voltage is low for the flash to work.,
    Please change new batteries.
 

6-3 Image is blurred / out of focus 
1. Subject is out of focal range. Ensure that there is at least 1.5m
    ( 5ft )  between the camera lens and subject.
2. Camera moved- Hold the camera steady while taking the picture.
    When flash is on, hold the camera steady until flashes have
     fired two times( First flash is to reduce a red-eye phenomenon 
     and to detect the brightness of the target.)