User Guide

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 camera module uses socket type connecting. For versioning, laser marked serial numbering is used on
the PWB.
The main parts of the module are:
•
Lens unit including lens aperture.
•
Infrared filter; used to prevent infrared light from contaminating the image colors. The IR filter is glued
to the EMI shielded camera body.
•
Camera body; made of conductive metallized plastic and attached to the PWB with glue.
•
Sensor array including DSP functions is glued and wire-bonded to the PWB.
•
PWB, FR-4 type
•
Socket type connection
•
Laser-marked serial numbering on PWB (for versioning)
•
Passive components
•
Camera protection window; part of the phone cover mechanics
•
Dust gasket between the lens unit and camera protection window
Image quality analysis
Testing for dust in camera module
Symptoms and diagnosis
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. Figure "Effects of dust on optical path" is an example image containing easily detectable
dust problems.
When taking a white image, use uniformly lightened white paper or white wall. One possibility is to use
uniform light but in this case make sure that the camera image is not flickering when taking the test image.
In case flickering happens, try to reduce illumination level. Use JPEG image format for analysing, and set the
image quality parameter to ‘High Quality’.
Black spots in an image are caused by dirt particles trapped inside the optical system. Clearly visible and
sharp edged black dots in an image are typically dust particles on the image sensor. These spots are searched
for in the manufacturing phase, but it is possible that the camera body cavity contains a particle, which may
move 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.
If a dust particle is lying on the infrared filter surface on either side, they are hard to locate because they are
out of focus, and appear in the image as large, grayish and fading-edge 'blobs'. Sometimes they are invisible
to the eye, and thus the user probably does not notice them at all. However, it is possible that a larger particle
disturbs the user, causing need for service.
RM-437; RM-449; RM-450
Camera Module Troubleshooting
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