Marconi TF2700

Hi Jim, Maybe by now you will have found a manual. Like you I bought a TF 2700 just recently on ebay ..perhaps from the same eastwood people? Anyway if you need a manual this one is very handy.

approx 7MB download pdf Good luck, mine seems in good shape after a bit of a cleanup and the manual sorts out what the various settings of range and loss switches should be at. It was a bit quirky to begin with but now it all makes sense and works a treat so I am a happy bunny. Let me know how you get on. Mike

This is my first newsgroup post so maybe I could ask for some help from the newsgroup.

Is there anyone who has experience of repairing a Tektronix TDS 460. ( 4 channel 350MHz DSO ) ?? Mine shows an acquisition fail in the self test. It behaves OKish in free run outside the waveform trigger region and one gets an untriggered free running trace activity on screen. However when the trigger level is in the correct active part of the waveform no triggered capture takes place..ie the trig light goes on..and the waveform disappears. Having tried to read up any leads from the web I suspect a capacitor may have gone down in either the trigger circuit or on the a/d acquisition board. The snag is that these scopes were module repair as far as I can tell, so the usual wonderful Tek service manuals which I now have, have no PCB level schematics.

Any help here would be very gratefully received...maybe I should post this as a separate post...forgive y naive use as usenet is rather new to me. Thanks for looking Mike K

I don't know if it will help in your case, but I've fixed several TDS460s that had power up problems. Replacing all the electrolytic's in the switching power supply fixed the problem. Maybe your caps are just starting to go south? Looking at the PS outputs with a scope and checking for ripple may be a good start.

Good luck!

Hi Mike, I found a website from which I was able to download the TF2700 manual. Haven't got round to checking mine yet, but I've taken the precaution of getting a couple of OC203s and some AC128s as spares (couldn't find any OC200s or GET102s but choice of types doesn't look to be critical).

Jim Hawkins