Nokia RM-12 Troubleshooting Instructions page 86

RM-12
Nokia Customer Care
Figure 14: Image taken with a greasy protection window
Bit errors
Bit errors are defects in image caused by data transmission error between camera and phone
baseband or inside camera module. Bit errors can be typically seen in images taken of any
object, and they should be most visible in full resolution images. A good practice is to use uni-
form white test target when analyzing this kind of errors.
The errors will be clearly visible as colorful sharp dots or lines in camera images. See Example
about bit errors caused by JPEG compression. One type of bit error is lack of bit depth. In that
case image is almost totally black under normal conditions sensing something only under very
high illumination.
Typically this is a contact problem between the camera module and phone main PWB. Check
camera assembly and connector contacts.
If fault is in the camera module typically bit error is visible only when using some specific image
resolution. E. g. in viewfinder fault might exist but not in full size image.
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