Re: electrohome G05-805 parts question ..

that's the word..

ripples...

there's static rippling in the vectors, more noticeable on the shorter vectors.. in the longer vectors, the ripple is only for the first quarter of the line length.. its not a board problem, several boards look the same in it, and the boards in turn look ok on my test rig and in other machines.. :)

interesting you should say that about the resistors and stuff... you see, at some point there has been a small fire on the deflection board, several replaced components, and strangely, some component spaces not loaded, i can only assume they shouldn't be..

i'll whip the deflection pcb out tonight and put it on the flatbed scanner and post a link to the pic so you could see..

in the meantime, i can go thru the manual and check every component ugh :)

thanks!

Andy Welburn

  ----- Original Message -----
  From: Rodger Boots
  To: vectorlist@synthcom.com
  Sent: Monday, April 30, 2001 9:04 AM
  Subject: Re: VECTOR: electrohome G05-805 parts question ..

  That's one thing to try. I wouldn't think the transistor would cause vectors not to line up (but board adjustments would). And do any of your lines have ripples or zigzags in them? Either of these could point to either regular wirewound resistors being used instead of the non-inductive wirewound resistors in the yoke feedbacks (yoke to ground) OR a bad filter capacitor allowing high-voltage power supply noise to get back into the deflection circuits.
    
  John Robertson wrote:

     Try moving the BDW51C to the other 2N3716 position and vice versa. Does the problem shift? If not then it is on the game board, or the deflection amp on the monitor. Try the board in your friends machine to eliminate it...
    John :-#)#
      

    At 02:05 PM 4/29/2001 -0500, you wrote:

      A BDW51C crosses to an ECG/NTE284 or SK3836.
      A 2N3716 crosses to an ECG/NTE284 or SK9134.
      Well, THAT'S kind of interesting! What is the difference between an SK3836 and
      SK9134? They are both NPN power transistors in a TO-3 case, but beyond that I
      don't know.

      There is a common saying "If it ain't broke, don't fix it" that might apply
      here. Does it work? Then leave it alone!
        

      Andy Welburn wrote:

> hi all.
>
> I'm just looking to cap an electrohome g05-805 that i have in a battlezone
> caberet, i've found the deflection transistors on the underside of the
> chassis, however, after expecting a 16/92 arangement i find there is 2x
> 2n3792's, one 2n3716, and a BDW51c .
>
> would i be correct in assuming that this bdw51c is just an equivalent part
> for a 2n3716?
>
> the monitor works ok, but the vectors aren't spot on, they're not dead
> straight all the time.. i've replaced most caps, but i think the deflection
> transistors getting replaced should do it some good..
>
> anyone care to comment?? i'm a bit unsure..
>
> thanks in advance
>
> Andy Welburn
>
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Received on Mon Apr 30 10:23:56 2001