Author Topic: Schematic and troubleshooting of LD 4000 FL ballast  (Read 535 times)

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Offline krzychb

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Schematic and troubleshooting of LD 4000 FL ballast
« on: March 20, 2016, 08:59:25 pm »
Hello everybody and here is my first post :)

Thanks to great blog by Pavel Ruzicka I have managed to repair two faulty electronic ballasts of LD 4000 fluorescent lamps by a German company Elektra. I have seven of them used every day since more than 12 years. Two failed out of seven over 12 years seemed to me a reasonable reliability to invest some time for repair.

You will find schematic of ballast and description of repair in my repository.

Below is a nice waveform of ballast starting up.  I consider it as an EKG of FL brought back to life ;)

If you have such lamp and it happens to be faulty, do not throw it away because it is robust, nicely designed and therefore fun to fix.

« Last Edit: March 30, 2016, 07:58:17 pm by krzychb »

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