Check first serious view camera outside the switch operation, it is set as the normal state, handle toggle zoom, zoom motor movements, not on the viewfinder still images, digital zoom is shown as 100 times. Analysis: because of state switch has been allocated to the normal position, so the zoom should be between 1 ~ 8 times the normal state of mechanical zoom, and if the viewfinder display digital zoom, explain the digital video camera there is fault. ePBservice manual download site
 ePBservice manual download site
The machine is the realization of the digital zoom mainly through the transformation on the front panel number/normal state of the switch. Is based on the state of the switch in the circuit that IC312 (MN1882010VOM) the potential of 33 feet to determine IC304 (MN6733) internal signal works, if 33 feet for high potential IC304 works in normal state, the Y is directly through IC304 signal; 33 feet for low potential IC304 work in digital zoom. ePBservice manual download site
 ePBservice manual download site
 ePBservice manual download site
The state switches 33 feet potential changes, but there is no change of viewfinder. According to the mechanical state of zoom zoom motor not the failure, to show that the circuit fault probably out IC312 around. Because the zoom motor controlled finally reflected in IC312 42 and 43 feet, so will overhaul of the emphasis on the microprocessor and peripheral circuit. Test IC312 each pin voltage, no exception, then test lC309 (MN1882010VON) pin voltage is essentially normal. So instead of using oscilloscope waveform at various points test, test found at the ends of the X301, X302 waveform is normal. The reset circuit IC311 (MN13821) (2) feet in boot instantly found no reset pulse, and artificially in a 100 Ω resistance after (2) feet of instantaneous short circuit. Toggle zoom motor controller, can zoom, viewfinder also show the image, then image is normal, enough to prove that IC311 fault occurs. In instant boot IC311 cannot provide microprocessor IC309, IC312 reset pulse. Make internal microprocessor can't correctly into the initialization, and can't work conducted within a program. After replacing IC311, repeated on/off. The camera troubleshooting.

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