Koden MD300 radar

Discussion in 'The Projects Forum' started by patpin, Sep 20, 2012.

  1. patpin

    Thread Starter Member

    Sep 15, 2012
    226
    18
    Hello,
    I hav got a Koden MD300 . Is works fine until after turning it on on another occasion (6mds later) the rings didn't appear after the normal heating up period of 150 sec. Also another time the rings were flickering on the CRT screen. The radar is from 1988. Any idea's?:confused:
     
  2. R!f@@

    AAC Fanatic!

    Apr 2, 2009
    8,754
    760
    Yes..! it's broke.
     
    patpin likes this.
  3. debe

    Well-Known Member

    Sep 21, 2010
    947
    184
    Does it look like this? I own this one & have the workshop manual for it. Is it only the range rings not showing?
     
  4. patpin

    Thread Starter Member

    Sep 15, 2012
    226
    18
    Yes, it looks exactly as the joined photo's. The only exterior difference is that your type is a MD3000 and mine a MD300.
    The only failure is that the rings sometimes dont come on the screen, another time they do ana on another occasion they come on the screen after 5 or 10 minutes. Do you have an electronic copy of the workshop manual? Thanks fr yr answ.
     
  5. debe

    Well-Known Member

    Sep 21, 2010
    947
    184
    I have scaned the Wksp manual & there is 40 pages on the Logic circuits & 109 pages on the rest of the circuits. I can see if it will burn onto a CD & post it to you. Heres a bit on range rings. The 2 pictures are of where the Azimuth signal is located in the Antenna & the plug on the back of the Display unit. Have seen plenty of problems with int breaks in the cable conecting the Antena to the Display. Particularly on Planing hull vessels where the units are subjected to viabration & shock loading. If you are curious the reference to( Rebuilt motor) is how i rebuilt the Antena drive motor after mine failed & no longer avalable, Thats another story. The Azimuth signal is also generated in the motor.
     
    Last edited: Sep 21, 2012
  6. debe

    Well-Known Member

    Sep 21, 2010
    947
    184
    Some more.
     
  7. debe

    Well-Known Member

    Sep 21, 2010
    947
    184
    There is 2 types of Logic boards in this model, The T100-7000M1 circuit shown here is the best i have of this board. Have Wksp manual on CD now, If you need it PM me a postal address.
     
    Last edited: Sep 22, 2012
  8. cork_ie

    Member

    Oct 8, 2011
    348
    58
    I'm impressed at the efforts some AAC members go to, to help their fellow man!
     
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