User Guide

Table of Contents
Introduction to camera module troubleshooting ..............................................................................................5–5
The effect of image taking conditions on image quality...................................................................................5–6
Camera construction........................................................................................................................................... 5–10
Main camera construction.................................................................................................................................. 5–11
Image quality analysis ....................................................................................................................................... 5–12
Testing for dust in camera module .............................................................................................................. 5–12
Testing camera image sharpness................................................................................................................. 5–13
Dirty camera lens protection window ......................................................................................................... 5–14
Image bit errors ............................................................................................................................................. 5–14
Camera troubleshooting..................................................................................................................................... 5–16
Camera hardware failure troubleshooting....................................................................................................... 5–16
Camera baseband hardware failure troubleshooting ..................................................................................... 5–17
Camera image quality troubleshooting............................................................................................................ 5–18
Flash LED troubleshooting.................................................................................................................................. 5–19
Introduction to flash LED troubleshooting.................................................................................................. 5–19
Flash LED and image taking conditions ....................................................................................................... 5–19
Camera flash LED troubleshooting ............................................................................................................... 5–24
List of Figures
Figure 26 Blurred image. Target too close. .........................................................................................................5–6
Figure 27 Blurring caused by shaking hands ......................................................................................................5–7
Figure 28 Near objects get skewed when taking images from a moving vehicle...........................................5–7
Figure 29 Noisy image taken in +70 degrees Celsius .........................................................................................5–8
Figure 30 Image taken against light....................................................................................................................5–8
Figure 31 Flicker in an image; object illuminated by strong fluorescent light................................................5–9
Figure 32 A lens reflection effect caused by sunshine........................................................................................5–9
Figure 33 Good image taken indoors................................................................................................................ 5–10
Figure 34 Good image taken outdoors ............................................................................................................. 5–10
Figure 35 Camera module cross section and assembly principle................................................................... 5–11
Figure 36 Main camera module bottom view including serial numbering................................................... 5–11
Figure 37 Effects of dust on optical path .......................................................................................................... 5–13
Figure 38 Image taken with clean protection window................................................................................... 5–14
Figure 39 Image taken with greasy protection window ................................................................................ 5–14
Figure 40 Bit errors caused by JPEG compression............................................................................................ 5–15
Figure 41 Example of a good quality image taken with the flash LED .......................................................... 5–19
Figure 42 overexposed image............................................................................................................................ 5–20
Figure 43 Dark and noisy image ........................................................................................................................ 5–21
Figure 44 Shaken image ..................................................................................................................................... 5–22
Figure 45 Camera white balance failure and overexposure ........................................................................... 5–23
Figure 46 Color difference between flash colour limit samples..................................................................... 5–23
RM-437; RM-449; RM-450
Camera Module Troubleshooting
Issue 1 COMPANY CONFIDENTIAL Page 5 –3
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