Question about Sunpak Auto 544 Flash
One easy thing: I would like to buy some transformers (oscillation transformers) of the 544 Sunpak flashes. If you do not know, it's OK, please do not give irrelevant information. Truly said, I am working on those Sunpak flashes in a company and my company has a shortage of these transformers. If you can show me, maybe we will order a lot of them.
Thanks and have nice days.
IF you are working on them then you know the part number on the transformer. You may need to use Alibaba to see if the part is available in China.
Posted on Jul 31, 2017
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Posted on Jan 02, 2017
The probable cause of such behavior is a faulty quench capacitor. The part is specially manufactured to withstand rather high voltage (350 V) and large current peaks (300 A) - despite of its small dimensions - and often goes wrong. Replace it with a capacitor cannibalized from a cheap second-hand shoe-mount flash having the same feature (series thyristor circuitry) and as high guide number as available. Both Sunpak units are highly populated inside, only try to repair them if you have a certain skills in such a job. If any of these explanations is unfamiliar for you then leave the flash alone and take it to a repair shop - there is lethal voltage inside, even long after the unit has been switched off. Good luck! Laszlo (kalaci at index dot hu)
Posted on Jan 24, 2008
SOURCE: sunpack 544 flash
There can be more than one reasons for that.
1. Broken wire at sync terminal.
2. Electronic sync issue:
2.1. Faulty sync thyristor (CR02).
2.2. Faulty trigger transformer
2.3. Any other passive component around the previous two.
3. Broken sync lead to the flash tube.
4. Broken leads to the main terminals of the flash tube.
5. Electronic fault at main thyristor.
5.1.Faulty main thyristor.
6. Faulty flash tube.
7. Other, like crack on the PCB.
Good luck! :)
If you happen to decide to part with your faulty flash, please consider to write me first, I offer it a good home... best regards, Laszlo klaci(at)index(dot)hu
Posted on Nov 14, 2008
The Rebel XTi has a sophisticated communication protocol between the camera and a dedicated flash. Only ETTL-II capable flashes can benefit from all the features the engineers at Canon thougt out. This means that with the otherwise superb Sunpak you won't be able to emit autofocus assist pulses, red-eye reduction pulses, the camera won't increase or reduce the flash intensity for bracketing, zoom lens settings won't be reflecting on the flash illumination angle, and so on. But! Set your Canon to full manual (125th sec), set Sunpak to auto, take one of the working apertures according to your taste (depth of field, etc.) and set the same aperture on the camera, and shoot. You still can use bounce flash. I am not sure about second curtain flash, I suspect it won't be possible. Both tele kit and milky filter in front of the flash head are of great help, you don't need to worry about the differences these make in flash intensity. Always keep in mind that the flash makes good exposure according to the given working aperture and, as long as you set the same aperture on the camera, the subject will be correctly illuminated. (I have a Sunpak 522 and a 455 and employ them this way, with success, on my XSi.) Of course you can set set the flash in full manual (M/PR/MD), using the left side, set knob and calculator dial, and this is the only way if you want to make series of shots, because the flash can only make bursts if the power is reduced to at least 1/16th. Good light, Laszlo
Posted on Dec 06, 2008
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