User Guide

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8 — Camera Module

Troubleshooting

Nokia Customer Care

Issue 1 Company Confidential Page 8–1

Summary of content (18 pages)

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RM-1 Camera Module Troubleshooting Nokia Customer Care Table of Contents Introduction to camera module troubleshooting...............................................................................................................8–5 The effect of image taking conditions on image quality..................................................................................................8–6 Image quality analysis ..................................................................................................
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RM-1 Camera Module Troubleshooting Nokia Customer Care Introduction to camera module troubleshooting Background, tools and terminology Faults or complaints in camera operation can be roughly categorised into three subgroups: 1 Camera is not functional at all; no image can be taken. 2 Images can be taken but there is nothing recognizable in them. 3 Images can be taken and they are recognizable but for some reason the quality of images is seriously degraded.
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RM-1 Camera Module Troubleshooting Nokia Customer Care Sensitivity Camera module's sensitivity to light. In equivalent illumination conditions, a less sensitive camera needs a longer exposure time to gather enough light in forming a good image. Analogous to ISO speed in photographic film. Sharpness Good quality images are 'sharp' or 'crisp', meaning that image details are well visible in the picture.
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RM-1 Camera Module Troubleshooting Nokia Customer Care Figure 77 Blurring caused by shaking hands Movement in bright light If an image is taken of moving objects or if the device is used in a moving vehicle, object 'skewing' or 'tilting' may occur. This phenomenon is fundamental to most CMOS camera types, and usually cannot be avoided. The movement of camera or object sometimes cause blurring indoors or in dim lighting conditions because of long exposure time.
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RM-1 Camera Module Troubleshooting Nokia Customer Care Figure 78 Noisy image taken in +70 degrees Celsius Phone display If the display contrast is set too dark, the image quality degrades: the images may be very dark depending on the setting. If the display contrast is set too bright, image contrast appears bad and "faint". This problem is solved by setting the display contrast correctly. This is normal behaviour; do not change the camera module.
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RM-1 Camera Module Troubleshooting Nokia Customer Care Figure 80 Flicker in an image; object illuminated by strong fluorescent light Bright light outside of image view Especially the sun can cause clearly visible lens glare phenomenon and poor contrast in images. This happens because of undesired reflections inside the camera optics. Generally this kind of reflections are common in all optical systems. This is normal behaviour; do not change the camera module.
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RM-1 Camera Module Troubleshooting Nokia Customer Care Examples of good quality images Figure 82 Good image taken indoors Figure 83 Good image taken outdoors Image quality analysis Testing for dust in camera module Context For detecting these kinds of problems, take an image of a uniform white surface and analyse it in full resolution. A good quality PC monitor is preferred for analysis. Search carefully, since finding these defects is not always easy.
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RM-1 Camera Module Troubleshooting Nokia Customer Care onto the image sensor active surface, for example, when the phone is dropped. Thus it is also possible that the problem will disappear before the phone is brought to service. The camera should be replaced if the problem is present when the service technician analyses the phone.
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RM-1 Camera Module Troubleshooting Nokia Customer Care 2 The photographed object is too close – the camera lens operates with distances from 40 cm to infinity. This is no cause to replace camera module. 3 User has tried to take pictures in too dark conditions, and images are blurred due to handshake or movement. This is no cause to replace camera module. 4 There is dirt between the protection window and camera lens. 5 The protection window is defective.
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RM-1 Camera Module Troubleshooting Figure 85 Image taken with clean protection window Nokia Customer Care Figure 86 Image taken with greasy protection window Image bit errors Bit errors are image defects caused by data transmission errors between the camera module and the phone baseband and/or errors inside the module. Usually bit errors can be easily detected in images, and they are best visible in full resolution images.
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Nokia Customer Care RM-1 Camera Module Troubleshooting Note: Make sure that the phone has the latest software before continuing. Results The camera is working properly. Next action If there are still problems with the camera, see Camera baseband hardware troubleshooting (Page 8–15). Page 8–14 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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RM-1 Camera Module Troubleshooting Nokia Customer Care Camera baseband HW troubleshooting Note: The rest of the camera signals are present ONLY when camera is operating. Use the Camera application to start the camera power-on sequence. Issue 1 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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Nokia Customer Care RM-1 Camera Module Troubleshooting Figure 88 Example of differential amplitude. The differential amplitude in this figure is (96 mV + 140 mV) / 2 = 118mV. Figure 89 Example of common mode voltage. The common mode voltage in this figure is (980 mV + 860 mV) / 2 = 920mV. Page 8–16 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.
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RM-1 Camera Module Troubleshooting Nokia Customer Care See Also • Bad image quality troubleshooting (Page 8–18) Bad camera image quality troubleshooting See Also • Camera hardware failure message troubleshooting (Page 8–13) Page 8–18 Company Confidential Copyright © 2004 Nokia. All Rights Reserved.