Nokia N72, Руководство по обслуживанию

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Table of Contents
Introduction to camera module troubleshooting ............................................................................................... 8–5
The effect of image taking conditions on image quality ................................................................................... 8–6
Image quality analysis ........................................................................................................................................ 8–10
Testing for dust in camera module ............................................................................................................... 8–10
Testing camera image sharpness .................................................................................................................. 8–11
Dirty camera lens protection window .......................................................................................................... 8–12
Image bit errors .............................................................................................................................................. 8–12
Camera troubleshooting flowcharts ................................................................................................................... 8–14
Camera hardware failure message troubleshooting ................................................................................... 8–14
Camera baseband HW troubleshooting ........................................................................................................ 8–15
Camera viewfinder troubleshooting ............................................................................................................. 8–16
Bad camera image quality troubleshooting ................................................................................................. 8–17
Flash LED troubleshooting ................................................................................................................................... 8–18
Introduction to flash LED troubleshooting ................................................................................................... 8–18
Flash LED and image taking conditions ........................................................................................................ 8–18
Flash LED construction .................................................................................................................................... 8–22
Analysing image quality ................................................................................................................................. 8–23
Possible faults in image quality ................................................................................................................ 8–23
Testing flash module functionality .......................................................................................................... 8–23
Testing image colours with flash ............................................................................................................. 8–24
Testing flash power ................................................................................................................................... 8–24
Flash LED troubleshooting flowcharts .......................................................................................................... 8–25
Bad image quality when using flash LED ................................................................................................. 8–25
Flash LED indicator mode troubleshooting ............................................................................................. 8–25
Flash LED HW baseband troubleshooting ................................................................................................ 8–26
List of Figures
Figure 66 Blurred image. Target too close. ......................................................................................................... 8–6
Figure 67 Blurring caused by shaking hands ....................................................................................................... 8–7
Figure 68 Near objects get skewed when taking images from a moving vehicle ........................................... 8–7
Figure 69 Noisy image taken in +70 degrees Celsius ......................................................................................... 8–8
Figure 70 Image taken against light .................................................................................................................... 8–8
Figure 71 Flicker in an image; object illuminated by strong fluorescent light ................................................ 8–9
Figure 72 A lens reflection effect caused by sunshine ........................................................................................ 8–9
Figure 73 Good image taken indoors ................................................................................................................. 8–10
Figure 74 Good image taken outdoors .............................................................................................................. 8–10
Figure 75 Effects of dust on optical path ........................................................................................................... 8–11
Figure 76 Image taken with clean protection window .................................................................................... 8–12
Figure 77 Image taken with greasy protection window ................................................................................. 8–12
Figure 78 Bit errors caused by JPEG compression ............................................................................................. 8–13
Figure 79 Example of a good quality image taken with the flash LED ........................................................... 8–18
Figure 80 overexposed image ............................................................................................................................. 8–19
Figure 81 Dark and noisy image ......................................................................................................................... 8–20
Figure 82 Shaken image ...................................................................................................................................... 8–21
Figure 83 Camera white balance failure and overexposure ............................................................................ 8–22
Figure 84 Color difference between flash colour limit samples ...................................................................... 8–22
Figure 85 Mechanical construction of the flash LED module ........................................................................... 8–23
RM-180
Camera Module Troubleshooting Nokia Customer Care
Issue 1 COMPANY CONFIDENTIAL Page 8 –3
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