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SUCCESS !!!!!!! CAL 06 and CAL 07 just performed (without making any adjustments) and I noticed that the dots that replace the "???????" during the CAL procedure disappeared (it might have been after

Hi Nigel, Cal 06 sets up the scope so you can make the necessary adjustments, but doesn't attempt to read any of the results itself. It is entirely left to you to twiddle the caps, resistors and

At last, someone who actually recognises the error code!!!! Great news Chuck; I had a feeling in my bones that I'd get a response! So, since I've not yet attempted to do CAL 06, exactly how do I

Hi Nigel, Tell your friend: Test 04, Fail 03 is a common error, and yes, it is explicitly listed in Table 6-4, of the 2467 Service manual. The Fail code is the sum of all of the errors that are

The following photos have been uploaded to the DM502 Switch pack ( /g/TekScopes2/album?id=279187 ) album of the [email protected] group. * Switch Pack.JPG (

I have an issue with the switch pack on a DM502A I will be uploading pictures. here in a few. I am servicing the meter and the switch actuator spit its self out of the front of the meter. I am curious

I'm posting here parts of a thread that previously ran on Tekscopes in case there are others who may have another slant on this problem. The scope boots up with a DIAGs message of Test 04 Fail 03.

Sure, the opamp could be receiving a -0.87V input. Start with where the result is bad, and work back to where it makes sense again. U1956B is a non inverting amplifier with a gain of 1. What is on pin

Sorry for the delay on the answer, Chuck. My guess is based on this line of my first post of this trend ***quote I noticed the volatge on pin1 of U1956B was -0.87V. According to the schematics, it

As I recall, the manual, or perhaps the manual update sheets, mention this effect. I think they added a resistor at a certain point to allow some pulses, albeit ugly, to appear if the TG is not

A reply to cover several inputs.... When I first noticed the problem, I was using a 50ohm cable direct to my 7904A/7A26 which has only the standard 1M/22pf input impedance. If I recall, there probably

The timing is unaffected by term, but indeed the output voltage and wave is specified for 50 Ohms term. This quirk never affected my use of the TM501 Jon

Nigel, I have? 3 working TG501 units and they indeed only only output the proper fast rise and fall peak shaped Time marks when they are 50 Ohm terminated. However, when connected directly into a

I've evolved to finding that in fact my TDS684A power supply is good, and is instead cycling due to a 24V supply over current. Further testing has found that it is the CRT display portion that is at

I don't quite understand how you could be getting "nothing" (though I have not checked the manual or schematic for the TG501). I assume that you feeding into a high impedance load (e.g. a 10MΩ scope

A word to the wise. I know how we all religiously terminate our 50 Ohm cables with a 50 Ohm load...... don't we.....???? Well sometimes we forget, or are just doing a quicky check and fail to use, or

In my mind they are. Keithly is a tektronix company. Eric wrote:

Hi all, I think Tektronix and Keithley are part of the same group, so I thought appropriate to post here. I searched for a Keithley group, but don't seem to find one. Is there no such thing? Are

Did you by chance remove all the caps and then install new ones?? There is a mistake in the service manual that will have you install low voltage caps on a higher voltage output. Sometimes it goes

I will look into the caps mentioned and I have been looking into the comparators. Would be nice to be able to trust schematic. This is same issue salvage side had when I got it. Thanks for help.