Handling Instructions; Image Quality Analyses - Nokia RM-313 Service Manual

RM-313
Camera Module Troubleshooting
Figure 38 Possible sources of electric shocks

Handling instructions

With an undamaged module there is no possibility of an electric shock. However, the possible damage cannot
always be seen and therefore insulating glows should be always worn, when handling the Xenon module.
Disassembling the module is never allowed, because there is no way to fully discharge the module and also
repairing is impossible.
Care must be taken, when module is removed from the phone, because the flex is quite sensitive and can be
broken during removing. The flex should also not be bended or twisted unnecessarily.

Image quality analyses

Possible faults in image quality
When checking for possible errors in the flash functionality, knowing what error is suspected will significantly
help the testing by narrowing down the amount of test cases. The following types of image quality problems
may be expected to appear:
• Xenon module is not flashing at all
• Colours of the images are bad
• Flash power is weak (long distances, over 2m)
• Images overexposed at short distances (less than 20cm)
Testing module functionality
For testing module overall functionality, take an image with the flash and monitor same time whether the
LED flashes or not.
To do this test use always FORCED FLASH mode in the phone, not AUTOMATIC mode.
FORCED FLASH mode forces the LED module to flash even if there is some ambient light in present.
Testing image colors with the flash
For testing image colors with the flash. Take an image of the target, which contains something white. You
should take the image in the total darkness and from the ~ 1m range.
If the white target appears to be white then the flash is working correctly. However remember that there is
some variation in the flash color from module to module (see previous figure).
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