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7000 series on screen graphics question 7704A versus 7633

 


Chris - where do you live - I'm happy for you to visit me in
Kenilworth, Warwickshire with the scope if you are unhappy to fiddle with it yourself.
Regards,
David Partridge

I am just north of Shrewsbury, but being in the race car game I get to
travel about a lot, so I could drop it in at a mutually agreeable
time? You aren't that far away at all, in the grand scheme of things.

I don't mind fiddling with stuff, but this to me is pretty darned
complex, and I would hate to do it a mischief. If you want to e-mail
me I am at chris (at) chriswilson.tv I would be most grateful if you
could find time to take a look at it at some stage, even if it's to
tell me that they are all like that ;) Thanks David

16/07/2012 21:55



--
Best Regards,
Chris Wilson.
 

No, it doesn't look right. I have the same scope (also NOS, maybe from the same MOD source ?) and mine looks like the first image.

IIRC, the character generator has 2 sets of adjustments, some on the board itself (position, hight , width etc) and more adjustments on the V-output amp where the vector is summed (and possibly on H-output as well). I bet the lead routes make a difference too :-) . I also have a 7603 with a similar looking defect (it resisted my attempts to adjust it / fix it - but it's a spare so I didn't look too hard)

You will need the serial numbers as there are serveral different versions ...

dc

--- In TekScopes@..., Chris Wilson <chris@...> wrote:



16/07/2012 21:06

Thanks for the replies re this issue. Whilst I agree the "hand drawn"
quality is somewhat charming my old eyesight isn't what it was and I
have to peer at the screen to work them out sometimes. I am convinced
there's now something not quite right about this. The numerals /
letters also waver very slightly, but only horizontally. I have been
offered the display board from a breaker 7704A, is it safe to plug it
in and see what happens, or is it not that simple? Thanks gentlemen!

--
Best Regards,
Chris Wilson.
mailto: chris@...
 


No, it doesn't look right. I have the same scope (also NOS, maybe
from the same MOD source ?) and mine looks like the first image.
IIRC, the character generator has 2 sets of adjustments, some on
the board itself (position, hight , width etc) and more adjustments
on the V-output amp where the vector is summed (and possibly on
H-output as well). I bet the lead routes make a difference too . I
also have a 7603 with a similar looking defect (it resisted my
attempts to adjust it / fix it - but it's a spare so I didn't look too hard)
You will need the serial numbers as there are serveral different versions ...
dc


17/07/2012 21:54

Thanks David, mine came from a charming lady re seller in Somerset,
one of a pair she was selling. I'm going to get David Partridge to
cast his expert eye over it shortly, it's a shame not to set it to
rights, being such an otherwise mint example. It's perfectly usable as
is, but things like that frankly bug the hell out of me ;)

--
Best Regards,
Chris Wilson.
 


No, it doesn't look right. I have the same scope (also NOS, maybe
from the same MOD source ?) and mine looks like the first image.
IIRC, the character generator has 2 sets of adjustments, some on
the board itself (position, hight , width etc) and more adjustments
on the V-output amp where the vector is summed (and possibly on
H-output as well). I bet the lead routes make a difference too . I
also have a 7603 with a similar looking defect (it resisted my
attempts to adjust it / fix it - but it's a spare so I didn't look too hard)
You will need the serial numbers as there are serveral different versions ...
dc

Thanks for that, looks like the easiest way forward is to swap out the
board (se my wanted post for details). David partridge thinks I can
use any known good board in any 7633 scope and they should work, have
you ever had cause to swap early for late etcetera? My scope came from
a dealers in Somerset, I think they had three of them, certainly two
anyway. Apart from the character display it's been fine, and I wasn't
even aware it was not as it should be until I saw some photos of
similar scopes showing a display. I can live with it as it is, but
would like to sort it as it kind of bugs me now :) Thanks dc


21/07/2012 15:25



--
Best Regards,
Chris Wilson.
Rob
 

What the possibility of those guys in Somerset letting you swap the board to
make sure that will fix the problem and then you give it back to them?....

Obviously I have nothing to base it on but I am not convinced that the
problem is in the board. I suppose if you can get a board cheap enough it
doesn't matter but before I laid out serious money (whatever that means) I
would want to be as sure as I could that this path would fix the issue.

Please don't read this as saying that swapping the board is not good advice.
I think it is/could be. However, I would just want to be as sure as I could
before I laid out $$.

Anyway, not meant to offend just brainstorming.
Rob

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf
Of Chris Wilson
Sent: Saturday, July 21, 2012 9:29 AM
To: david
Subject: Re: [TekScopes] Re: 7000 series on screen graphics question 7704A
versus 7633




No, it doesn't look right. I have the same scope (also NOS, maybe from
the same MOD source ?) and mine looks like the first image.
IIRC, the character generator has 2 sets of adjustments, some on the
board itself (position, hight , width etc) and more adjustments on the
V-output amp where the vector is summed (and possibly on
H-output as well). I bet the lead routes make a difference too . I
also have a 7603 with a similar looking defect (it resisted my
attempts to adjust it / fix it - but it's a spare so I didn't look too
hard)
You will need the serial numbers as there are serveral different versions
...

dc

Thanks for that, looks like the easiest way forward is to swap out the
board (se my wanted post for details). David partridge thinks I can
use any known good board in any 7633 scope and they should work, have
you ever had cause to swap early for late etcetera? My scope came from
a dealers in Somerset, I think they had three of them, certainly two
anyway. Apart from the character display it's been fine, and I wasn't
even aware it was not as it should be until I saw some photos of
similar scopes showing a display. I can live with it as it is, but
would like to sort it as it kind of bugs me now :) Thanks dc


21/07/2012 15:25



--
Best Regards,
Chris Wilson.



------------------------------------

Yahoo! Groups Links
 

Rob,

I couldn't work out by looking at the screen yesterday whether the problem was on both vertical and horizontal signals from the readout board, or just the vertical or just the horizontal. The only other readout boards I had to hand didn't appear to work at all - both untested early boards from 7633s that were scrapped (faulty HT xformers) - I don't think this should make any difference.

There wasn't time to start any serious component swapping - I should have swapped out U2284 which is the Format Generator chip, but didn't think to do that until too late.

I tried changing Q2530 on the vertical board, but that didn't fix it, I should probably have changed Q2430 as well but ran out of time. It might be the U510 horizontal channel switch that's causing all the problems but I didn't have time to swap that out either.

Certainly the problem was not focus or astigmatism.

Dave

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Rob
Sent: 21 July 2012 16:03
To: TekScopes@...
Subject: RE: [TekScopes] Re: 7000 series on screen graphics question 7704A versus 7633

What the possibility of those guys in Somerset letting you swap the board to make sure that will fix the problem and then you give it back to them?....

Obviously I have nothing to base it on but I am not convinced that the problem is in the board. I suppose if you can get a board cheap enough it doesn't matter but before I laid out serious money (whatever that means) I would want to be as sure as I could that this path would fix the issue.

Please don't read this as saying that swapping the board is not good advice.
I think it is/could be. However, I would just want to be as sure as I could before I laid out $$.

Anyway, not meant to offend just brainstorming.
Rob

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf Of Chris Wilson
Sent: Saturday, July 21, 2012 9:29 AM
To: david
Subject: Re: [TekScopes] Re: 7000 series on screen graphics question 7704A versus 7633




No, it doesn't look right. I have the same scope (also NOS, maybe from
the same MOD source ?) and mine looks like the first image.
IIRC, the character generator has 2 sets of adjustments, some on the
board itself (position, hight , width etc) and more adjustments on the
V-output amp where the vector is summed (and possibly on
H-output as well). I bet the lead routes make a difference too . I
also have a 7603 with a similar looking defect (it resisted my
attempts to adjust it / fix it - but it's a spare so I didn't look too
hard)
You will need the serial numbers as there are serveral different
versions
...

dc

Thanks for that, looks like the easiest way forward is to swap out the board (se my wanted post for details). David partridge thinks I can use any known good board in any 7633 scope and they should work, have you ever had cause to swap early for late etcetera? My scope came from a dealers in Somerset, I think they had three of them, certainly two anyway. Apart from the character display it's been fine, and I wasn't even aware it was not as it should be until I saw some photos of similar scopes showing a display. I can live with it as it is, but would like to sort it as it kind of bugs me now :) Thanks dc


21/07/2012 15:25



--
Best Regards,
Chris Wilson.



------------------------------------

Yahoo! Groups Links






------------------------------------

Yahoo! Groups Links
Rob
 

10-4. Thanks.
I didn't realize it had been broken down so far. In hind sight, I likely
should have though.

In any event, I suppose it may be obvious that I have done the bone head
thing in the past of paying for a board (admittedly a different
one/application) w/o fully exhausting everything else. Only later to find
the real 'issue' after laying out the $$. I actually have said board mounted
above my work bench as a constant reminder.

Thanks again for the deeper insight. I am sure it will work out favorably.
Rob

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf
Of David C. Partridge
Sent: Saturday, July 21, 2012 1:05 PM
To: TekScopes@...
Subject: RE: [TekScopes] Re: 7000 series on screen graphics question 7704A
versus 7633

Rob,

I couldn't work out by looking at the screen yesterday whether the problem
was on both vertical and horizontal signals from the readout board, or just
the vertical or just the horizontal. The only other readout boards I had to
hand didn't appear to work at all - both untested early boards from 7633s
that were scrapped (faulty HT xformers) - I don't think this should make any
difference.

There wasn't time to start any serious component swapping - I should have
swapped out U2284 which is the Format Generator chip, but didn't think to do
that until too late.

I tried changing Q2530 on the vertical board, but that didn't fix it, I
should probably have changed Q2430 as well but ran out of time. It might be
the U510 horizontal channel switch that's causing all the problems but I
didn't have time to swap that out either.

Certainly the problem was not focus or astigmatism.

Dave
-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf
Of Rob
Sent: 21 July 2012 16:03
To: TekScopes@...
Subject: RE: [TekScopes] Re: 7000 series on screen graphics question 7704A
versus 7633

What the possibility of those guys in Somerset letting you swap the board to
make sure that will fix the problem and then you give it back to them?....

Obviously I have nothing to base it on but I am not convinced that the
problem is in the board. I suppose if you can get a board cheap enough it
doesn't matter but before I laid out serious money (whatever that means) I
would want to be as sure as I could that this path would fix the issue.

Please don't read this as saying that swapping the board is not good advice.
I think it is/could be. However, I would just want to be as sure as I could
before I laid out $$.

Anyway, not meant to offend just brainstorming.
Rob

-----Original Message-----
From: TekScopes@... [mailto:TekScopes@...] On Behalf
Of Chris Wilson
Sent: Saturday, July 21, 2012 9:29 AM
To: david
Subject: Re: [TekScopes] Re: 7000 series on screen graphics question 7704A
versus 7633




No, it doesn't look right. I have the same scope (also NOS, maybe from
the same MOD source ?) and mine looks like the first image.
IIRC, the character generator has 2 sets of adjustments, some on the
board itself (position, hight , width etc) and more adjustments on the
V-output amp where the vector is summed (and possibly on
H-output as well). I bet the lead routes make a difference too . I
also have a 7603 with a similar looking defect (it resisted my
attempts to adjust it / fix it - but it's a spare so I didn't look too
hard)
You will need the serial numbers as there are serveral different
versions
...

dc

Thanks for that, looks like the easiest way forward is to swap out the board
(se my wanted post for details). David partridge thinks I can use any known
good board in any 7633 scope and they should work, have you ever had cause
to swap early for late etcetera? My scope came from a dealers in Somerset, I
think they had three of them, certainly two anyway. Apart from the character
display it's been fine, and I wasn't even aware it was not as it should be
until I saw some photos of similar scopes showing a display. I can live with
it as it is, but would like to sort it as it kind of bugs me now :) Thanks
dc


21/07/2012 15:25



--
Best Regards,
Chris Wilson.



------------------------------------

Yahoo! Groups Links






------------------------------------

Yahoo! Groups Links





------------------------------------

Yahoo! Groups Links

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