Nokia RM-57 Service Manual page 301

Nokia 6681/6682 mobile terminal

Table of Contents

RM-57/58

Camera Module Troubleshooting

Introduction to camera module troubleshooting................................................................................................................8–5

The effect of image taking conditions on image quality...................................................................................................8–6

Camera construction....................................................................................................................................................................8–10

Image quality analysis ...............................................................................................................................................................8–12

Testing for dust in camera module...................................................................................................................................8–12

Testing camera image sharpness......................................................................................................................................8–13

Dirty camera lens protection window.............................................................................................................................8–14

Image bit errors......................................................................................................................................................................8–15

Camera troubleshooting flowcharts.......................................................................................................................................8–15

Camera hardware failure message troubleshooting..................................................................................................8–15

Camera baseband HW troubleshooting...........................................................................................................................8–17

Camera viewfinder troubleshooting................................................................................................................................8–18

Bad camera image quality troubleshooting..................................................................................................................8–19

Flash LED troubleshooting.........................................................................................................................................................8–20

Introduction to flash LED troubleshooting.....................................................................................................................8–20

Flash LED and image taking conditions...........................................................................................................................8–20

Flash LED construction...........................................................................................................................................................8–24

Analysing image quality.......................................................................................................................................................8–25

Possible faults in image quality...................................................................................................................................8–25

Testing flash module functionality.............................................................................................................................8–25

Testing image colours with flash................................................................................................................................8–26

Testing flash power..........................................................................................................................................................8–26

Flash LED troubleshooting flowcharts..............................................................................................................................8–26

Bad image quality when using flash LED..................................................................................................................8–26

Flash LED indicator mode troubleshooting..............................................................................................................8–27

Flash LED HW baseband troubleshooting.................................................................................................................8–27

List of Tables

Table 17 Camera specifications................................................................................................................................................8–10

List of Figures

Figure 70 Blurred image. Target too close..............................................................................................................................8–6

Figure 71 Blurring caused by shaking hands.........................................................................................................................8–7

Figure 72 Near objects get skewed when taking images from a moving vehicle.....................................................8–7

Figure 73 Noisy image taken in +70 degrees Celsius..........................................................................................................8–8

Figure 74 Image taken against light.........................................................................................................................................8–8

Figure 75 Flicker in an image; object illuminated by strong fluorescent light...........................................................8–9

Figure 76 A lens reflection effect caused by sunshine........................................................................................................8–9

Figure 77 Good image taken indoors.....................................................................................................................................8–10

Figure 78 Good image taken outdoors..................................................................................................................................8–10

Figure 79 Camera module cross section and assembly principle..................................................................................8–11

Figure 80 Camera module bottom view including serial numbering..........................................................................8–12

Figure 81 Effects of dust on optical path..............................................................................................................................8–13

Figure 82 Image taken with clean protection window....................................................................................................8–15

Figure 83 Image taken with greasy protection window.................................................................................................8–15

Figure 84 Bit errors caused by JPEG compression..............................................................................................................8–15

Figure 85 Example of a good quality image taken with the flash LED........................................................................8–20

Figure 86 overexposed image..................................................................................................................................................8–21

Issue 1

Table of Contents

Company Confidential

Nokia Customer Care

Page 8–3

Table of Contents