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Thanks very much, Roger. You can go away on your holiday; don't worry about trying to fix this!!!

As I say, the gain is set in the sensor head so it's in the feedback loop of the main instrument, I have a 6501 photopic head but don't have the 6511 (cosine corrected) version. I'll be surprised if

J6511. He says it's the sensor and I believe him. I suspect this may be made of unobtanium.

There are a number of sensor heads available for this instrument, I have several of them here. They come in both 'imperial' and 'metric' units. In terms of electronic components they only have a photo

And I quote: "I went through the prescribed procedure in the manual to inject an artificial DC signal into the 15 pin connector on the readout unit and got a sensible number, but the whole thing goes

What do you mean by the sensor ? Is it the actual photo pick up device or it is the sensor assembly is not working ?

A friend acquired a J16 but the sensor is, in his words, "toast". Any thoughts on replacing such a beast?

There's no memory in the module but there is a DALLAS DS1742W-150 Timekeeping RAM on the main board in the scope. Does your scope have the latest firmware ? Is the date & time clock working as

Hello Kerry, Can you post some photos with waveforms for 5, 2 and 1 ns ?I have one TG 501 and I don't know if it is in range of specifications.I don't have an oscilloscope with 1 GHz bandwich, but? I

That would be the one I scanned. I took a lot of care to make sure it's clear -- if you find any problems, let me know, I still have the original files and paper manual. --Toby For serious fault

Sounds like an insulation failure in the HV section. With sound, my guess is the wire that brings HV to the CRT. HTH, Dave Wise ________________________________________ Sent: Monday, September 03,

There is a very decent PDF manual at w140.com/tekwiki/wiki/466. For serious fault finding I print off a few pages, sometimes as two sheets stuck together, and make a note on these where to find other

There were four revisions of 154-0644-0x, -00, -04, -05 and -09. Only -00 (< B040600) and -05 (repl for -00 and used from B040600) were used in 7704A. The other two were used by 7854 and 790x series

Hey all, When I turn on my 547, occasionally once the thermal relay clicks on, the fan will slow down more than usual, and I'll hear a loud crackle and hiss and the CRT won't come on. Any ideas what

My TDS3032 (original version) works fine. When I turn it off, it seems to retain its settings except it doesn't remember the GPIB address configured in the I/O Setting. I set it to GPIB Address 2, and

Oh, right. That hadn't occurred to me to be honest. I've removed the 'CRT fuse' as you suggested and run the rest of the scope up to 230VAC without anything going *bang* so that's a plus, anyway.

Hey Kerry, Nice to know that it worked. Such a pity that you had to replace U310. ECL logic ICs are usually very robust and don't seem to fail very often. But definitely, better this than having to

Hello Fabio i replaced U310 (with the help of another Tekscopes member) and this solved the problem. The 20ns, 10 ns and 5ns timing is now correct. I made most of the adjustments in the manual to

The circuitry around the high voltage transformer T1501 constitutes a power oscillator running at around 50kHz, there is feedback from the CRT cathode to Q1472 that controls the drive to the power

Ok Chris, Let me get the scales out and do some weighing! It would be much preferable to send the entire module, as I know it works, and includes the driver power transistors. I have things on over