Page 6 of 6 FirstFirst ... 456
Results 51 to 54 of 54

Thread: Used Norman 200b

  1. #51

    Join Date
    Jul 2008
    Posts
    2,554

    Re: Used Norman 200b

    Fixing up a Norman 200c.

    This is the later version of the time proven reliable Norman 200b. This 200c was part of a group of Norman strobe system bits. Inside the 200c battery compartment was a note saying blown fuse, needs repair. No schematic, but some idea of what might go wrong causing the fuse to fail. High on the list were the power FETS used to drive the HV converter transformers. Turns out this guess was correct. One of the four BUZ11A power fets was shorted Drain to Source causing the fuse to fail. The difficult part was extracting all four power fets for replacement.

    The power configuration of the 200c is different than the 200b as likely has two sections of HV power conversion which is switched as needed to vary the power output of 50w/s or 100w/s or 200w/s. Two BUZ11A power fets are run together in parallel per HV power conversion section. This also means best to match the two BUZ11A power fets per section. BUZ11A power fets have been around for decades, easily available at low cost. Got a more than a few stuck them on the Tek 576 curve tracer matching up the sets needed.
    Click image for larger version. 

Name:	Norman 200c, BUZ11A matching.jpg 
Views:	13 
Size:	47.5 KB 
ID:	217688

    Made up the power device mounting hardware and heatsink GOooo, put them in. 200c uses the power fet heatsink as part of their mechanical assembly and pcb support, sort of ok design.
    Click image for larger version. 

Name:	Norman 200c board bott.jpg 
Views:	25 
Size:	76.9 KB 
ID:	217689

    Top of the pcb assembly.
    Click image for larger version. 

Name:	Norman 200c, board top.jpg 
Views:	32 
Size:	74.5 KB 
ID:	217690


    Got the 200c back together.. remarkable it works after sitting waiting to be repaired all these decades.

    No battery came with this 200c. Had to figure out the batter connections illustrated below. Notable is the battery pack's +12 volt goes direct to the case, battery return are the two spring terminals at the top. They are connected together to run the 200c. Next up, make a battery pack for the 200c.
    Click image for larger version. 

Name:	Norman 200c Battery con.jpg 
Views:	15 
Size:	56.1 KB 
ID:	217691

    200c is about half the weight of the 200b with the same light output.

    This makes up a good Norman 200 system with more than one LH2 lamp head and reflectors and related accessories.
    200w/s is not quite enough for view camera stuff, but the plans for these Norman 200w/s strobe units are in process.


    Bernice

  2. #52

    Join Date
    May 2015
    Location
    SooooCal/LA USA
    Posts
    2,367

    Re: Used Norman 200b

    Great job, Bernice!!! Injured but not (too) dead...

    I love it when different areas of technology, mechanics, experience, creativity, processes etc come together to provide us with the tools to help us to transcend to create new ideas, new visions, new communications, beauty etc...

    Steve K

  3. #53

    Join Date
    Sep 2006
    Posts
    359

    Re: Used Norman 200b

    Thanks for all the battery advice on the 400B - I'll investigate these suggestions

    Phil

  4. #54

    Re: Used Norman 200b

    Broncolor Balloon and FOBA Sweep Table by Nokton48, on Flickr

    The Hasselblad Ringlight works great on the 5x7 Norma. The Norman 200B Power Pack was modified by New York City Flash Clinic. They were famous in the photo district, all the fashion Guys were using this. If they didn't adjust the pack, the tube would "sparkle" wildly after firing. I sent in two packs for modding. Sadly they are gone

    Works Killer on the 5x7 Norma

    200 Watt Seconds of Ringlight!
    Flikr Photos Here: https://www.flickr.com/photos/18134483@N04/

    “The secret of getting ahead is getting started.”
    ― Mark Twain

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •