Camera Module Specification; Camera Module Mechanics; Camera Troubleshooting Introduction - Nokia RX-44 Service Manual

RX-44
Camera troubleshooting

Camera Module Specification

Thefront camera of RX-44 is for video imaging purposes only. The main use cases are video call and web
camera use. Sales release SW does not enable still imaging.
Sensor type
Sensor valid pixels
F number
Focus range
Video resolution (max)
Video frame rate

Camera Module Mechanics

The camera module as a component is not a repairable part, meaning that the components inside the module
may not be changed. Cleaning dust from the front face is allowed only. Use clean compressed air.
The main parts of the module are:
-1/7" CIF CMOS sensor
-24-pin board to board connector'

Camera troubleshooting introduction

Possible Faults in Image Quality
When checking for possible errors in camera functionality, knowing what error is suspected will significantly
help the testing by narrowing down the amount of test cases.
The following types of video image quality problems may be expected to appear:
-Dust (black spots)
-Lack of sharpness
-Bit errors
In addition, there are many other kinds of possibilities for getting bad image quality, but those are ruled out
from the scope of this document since probability of their appearance is going to be minimized by production
testing.
Testing for Dust
For detecting this kind of problems, take video of uniform white surface and analyze it in full resolution.
Good quality PC CRT monitor is preferred for analysis (avoid using LCD). Search carefully since finding these
defects is not always easy.
Figure below gives an example of still image containing easily detectable dust problems. For taking a white
video uniformly lightened white paper or white wall can be used. One possibility is to use uniform light but
make sure that camera image is not flickering when taking test ivideo.
In case flickering happens try to reduce illumination level. Black spots in image are caused by dirt particles
trapped inside the optical system. Clearly visible and sharp edged black dots in image are typically dust
particles on image sensor. These spots are searched for in manufacturing phase, but it is possible that the
Issue 1
Table 13 Sub camera specification
COMPANY CONFIDENTIAL
Copyright © 2007 Nokia. All rights reserved.
1/7" CMOS sensor
658(H)x494(V)
F3.5
30cm to infinity
640 x 480
30fps
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