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kac-9630/ LM-9630 CMOS sensor problem

hi

im using sensor KAC-9630. the circuit im using is the one given in the
specification.
the sensor stops aquring images when its gain and/or intergration time
is set to some higer level.
i tried this with two sensors. Although first sensor had the above
problem, it started to work properly
without any problem after about a month it is soldered to the board.
second one worked fine initially, but suddenly started to behave as
above when i
re-solder some of its pins to correct some loose connections. i start
with gain of 1 and intergration time of 1. it works properly(although
the aquired image is totaly black)
until it is exposed to heavy light.
i work the sensor in Video mode, and did't check with snapshot mode for
the second sensor.
but i tried both modes with the first sensor, and same happend for both
modes.

thank you in advance.
 
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