Old Philips PM3302 Oscilloscope?

[DaveC]

Hi all.. sorry for the cross post but I though each of you could help in
this case...

I'm looking to buy an old Philips PM3302 Oscilloscope off a trade site. The
seller has listed its fault "Has a problem with the trace jumping" and
shows a picture of it in action here trying to display a square wave...

http://www.trademe.co.nz/structure/auction_photo.asp?id=10252004&permanent=
0&photoID=3346924

I thought if I could pick it up for a small amount I could have it fixed
with the money I'd have left over. So here are my questions.

1) Does any one know how old this is and what its specs are?
2) Would the fault cost much to have fixed and if it woulld be fixable?
3) How much should I pay in it's present condition?

Thanks in advance.
DaveC

 

[Jeff Liebermann]

On 4 Apr 2004 00:39:39 NZST, DaveC <bobason456@hotmail.com> wrote:

I'm looking to buy an old Philips PM3302 Oscilloscope off a trade site. The
seller has listed its fault "Has a problem with the trace jumping" and
shows a picture of it in action here trying to display a square wave...

http://www.trademe.co.nz/structure/auction_photo.asp?id=10252004&permanent=
0&photoID=3346924

If that's a square wave, it has more troubles than just a flakey
horizontal sync circuit. The rise time is apparently also faulty as a
square wave would have vertical lines, not at an angle.

I thought if I could pick it up for a small amount I could have it fixed
with the money I'd have left over. So here are my questions.

$20 is the current bid. My guess is that it can be fixed in about 2
hours. Dunno if the labour rate is worth it.

1) Does any one know how old this is and what its specs are?

20MHz. Digital storage. Toronto Surplus has one for US$395.
I have a PM3233 which is dated 1978(?) on one of the boards. The last
digit is barely readable and may be something else.

2) Would the fault cost much to have fixed and if it woulld be fixable?

Methinks you should also consider what it's worth if it were working.
I wouldn't bother with a 20MHz scope. You need at least 60Mhz or
preferably 100MHz to see anything useful. With multiple faults, I
don't think this can be economically repaired.

3) How much should I pay in it's present condition?

$20-$50. Essentially for the parts.

Thanks in advance.
DaveC

--
Jeff Liebermann 150 Felker St #D Santa Cruz CA 95060
(831)421-6491 pgr (831)336-2558 home
http://www.LearnByDestroying.com AE6KS
jeffl@comix.santa-cruz.ca.us jeffl@cruzio.com

 

[Nigel Cook]

"DaveC" <bobason456@hotmail.com> wrote in message
news:406eb08b@news.actrix.gen.nz...

Hi all.. sorry for the cross post but I though each of you could help in
this case...

I'm looking to buy an old Philips PM3302 Oscilloscope off a trade site.
The
seller has listed its fault "Has a problem with the trace jumping" and
shows a picture of it in action here trying to display a square wave...


http://www.trademe.co.nz/structure/auction_photo.asp?id=10252004&permanent=
0&photoID=3346924

I thought if I could pick it up for a small amount I could have it fixed
with the money I'd have left over. So here are my questions.

1) Does any one know how old this is and what its specs are?
2) Would the fault cost much to have fixed and if it woulld be fixable?
3) How much should I pay in it's present condition?

Thanks in advance.
DaveC

2 main reasons for jumping traces is in the trigger /
TB area.
1/ Mains riple on a DC rail in that area.
2/ Parasistic oscillation in or around an FET
in the TB
Both usually easily cured

electronic hints and repair briefs , schematics/manuals list on
http://homepages.tcp.co.uk/~diverse

Nigel, Diverse Devices,S outhampton, England