My technician is trying to repair the flash but is lost without the diagram.
I had the same problem on a new 285HV flash. I pulled it apart and found a blown resistor and track in the head of the flash.
The flash was fairly easy to pull apart, there is a clip hiding behind the blue disk, the rest is just screws.
There are 3 circuit boards, two in the base and one in the head.
The blown resister is in the head and is the large resister next to the violet wire. From the edge of the board there is R22 brown-black-brown, two diodes, another resistor yellow-violet-brown and then the one that died.
I have the service manual for the flash and it is titled 285/285HV but the circuit board in the service manual and in the flash are different.
After much studying of the circuit diagram I believe the value of the resister is 12K 2watt (90% sure, if not it is 10K 2watt).
I replaced the resistor with the 12K and was able to use the extra length of the leg of the resistor to bypass the blown track, used some heat shrink to insulate the leg from shorting out with the board.
I have tested the flash and it is working but I have not used it extensively.
Disclaimer: this board is right next to the capacitor, you don't want to touch it if it has a charge. Use a multimeter to check.
I bought the resistor from here: www.digikey.com Part No. P12KW-2BK-ND $0.206 (min order 5 still only a $1.03)
Good luck and remember I am not an electronics tech and your problem may be different to mine.
Richard
Actually that resistor was a 22k 2w but you should have no issues with that one I hope.. ;) that resistor gets fu*ked up if you bridge some high voltage on the PC sync connectore for some resaon, so you'll need to open up the whole vivitar 285HV until you reach the head circuit and desolder and solder a new resistor to fix it.
tent:wq
actually that resistor was a 22k, 2w not a 12k.. but ok.. ;) this little fu*cker gets easily blow in case of some sync bridging with some bad voltage.. need to open up the whole thing until the head and exchange the blown 22k with a new one..
tent:wq
this can also be helpful:http://www.flickr.com/photos/gromaler/29... =D
tent:wq
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What is the problem with the flash?
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Never work. I took it out of the box installed batteries and after three minutes I hear a loud pop and smelt smoke.
My technician opened it and one of the curcuit boards is burnt.
Thank you all. My technician figured out the values of the burnt components and fixed it.
Electroman. The flash is new. Vivitar relaunched this flash around March, 2007.
Thank you all. My technician figured out the values of the burnt components.
This flash is new. Vivitar relaunch this product around March last year.
I have the same exact problem. Just not sure what component is fried in my unit and mine is the new 285HV which i just got a week ago. Can you provide the component descriptions or anything that will assist in having my own electronics handy man troubleshoot my flash? Thanks in advance! -harry
Can you provide the component part numbers/names or a picture of what was fixed? My unit is fried as well and it is a new 285HV i recently got. I want to see if one of my friends is able to fix mine for me as well instead of shipping it back.
Hi uncleabe,
I have the same problem. Could you post the values for components?
When trying to open my Vivitar cables vari power is off, then I need the diagram for electric power cables to paste vari power, if you have the technical specifications would send me e-mail [email protected]
Al intentar abrir mi vivitar los cables del vari power se despegaron, entonces necesito el diagrama eléctrico para poder pegar los cables al vari power, si tienes las especificaciones técnicas agradecería me las enviaras al e-mail [email protected]
anybody know the shape of the filament of Vivitar 285HV? I am wondering if i can use it as a linear source in my optical project. Thanks
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