Diagnostic & repair
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As well as any modern digital devices, in Elphel network cameras the complex hi-tech components is included. We spend a lot of efforts for as possible long term trouble-free working of our cameras, but, unfortunately, any complex technical equipment has property to break.
The given section of Manual contains the information about the probable malfunctions arising during work of cameras, and ways of their detection and elimination. We hope, that the given section of Manual will be least visited by you.
Contents
Troubleshooting and Elimination
Necessary actions before repair or testing of cameras
Open the cameras case, take out the board's fastening screws and take out the processor board.
Accurately disconnect the cable from the sensor and attentively examine a processor board (especially around the network socket). All on-board details shouldn't have the overheating traces. Also there shouldn't be a smell burnt.
Malfunction
Camera does not work
Elimination
The C49, C50 and C52 condensers test
Sometimes the cameras does not work in result of short circuit in filter condensers C49, C50 or C52. For defining it, it is necessary to check up resistance in condensers. If the short circuit is revealed, the condenser is broken and its replacement is required.
The power supply checking
Connect the power supply cable to the processor board (the sensor cable can be disconnected).
Measure the voltage in points W14 - W13. There should be the 48V.
If in the given points the voltage is out, check up the voltage on condenser C52. If the voltage is present, the DC2 do not give out the power to the camera for any reasons. Can be short circuit in the DC3, or something else.
If the previous tests have the positive results, check up the voltage on DC3 output in points W12 - W11. It should be 3.3V. It is the basic system voltage intended for the processor and the network chip.
If the previous tests have the positive results, but the camera all the same does not work, also any indicator does not burn, it is necessary to check up the voltage on 2 contact of U2. It should be from +1 up to +3.3V. If the test result is from 0 up to 0.4V, the system is in constant reset which generates U2.
More
If the previous tests have the positive results, and the camera all the same does not work, you can try the Flashitall script.
If after updating the cameras software at reboot the green indicator is constantly burn, and the yellow indicator blinks during ping time, but ping answers are not present, you can try the Flashitall script.
Free Software and Open Hardware. Elphel, Inc., 2005
