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Tektronix 2247a 100mhz scope not working right on times/div
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powerstroke7.3:
I believe that I got this scope this way I had 3 different scopes at 1 point in time and I can't remember which ones were what but I got rid of the other 2 and kept this one and I guess this was the broken 1
 It only works in certain positions on The Times per division knob
https://youtu.be/rmCz7nXiKzw
wn1fju:
If it were a slightly older Tek scope, the sweep times were controlled by a mechanical cam switch which closed little leaf springs on the board.  Those were notorious for getting dirty and a gentle cleaning would usually fix all problems.  Once in a while, the timing capacitors and/or resistors would go bad, but I've only seen that a couple of times.

But, alas, your scope is all digitally controlled.  Download the operation manual and the service manual (w140.com) and read through them carefully.  You might want to try a few things, such as:

1) restore to factory default
2) attempt a calibration (probably will fail)
3) run the diagnostic program

There are two sweep generators in the scope, A and B.  You also might want to try the B sweep and see if that is working.  That might give you a clue as to whether the digital control data (common to both A and B) is making it through correctly, or if it is just a problem with the A sweep generation.

In any event, the service manual provides some information on how to diagnose/repair sweep problems.  Good luck.
powerstroke7.3:

--- Quote from: wn1fju on September 01, 2022, 12:10:21 pm ---If it were a slightly older Tek scope, the sweep times were controlled by a mechanical cam switch which closed little leaf springs on the board.  Those were notorious for getting dirty and a gentle cleaning would usually fix all problems.  Once in a while, the timing capacitors and/or resistors would go bad, but I've only seen that a couple of times.

But, alas, your scope is all digitally controlled.  Download the operation manual and the service manual (w140.com) and read through them carefully.  You might want to try a few things, such as:

1) restore to factory default
2) attempt a calibration (probably will fail)
3) run the diagnostic program

There are two sweep generators in the scope, A and B.  You also might want to try the B sweep and see if that is working.  That might give you a clue as to whether the digital control data (common to both A and B) is making it through correctly, or if it is just a problem with the A sweep generation.

In any event, the service manual provides some information on how to diagnose/repair sweep problems.  Good luck.

--- End quote ---
yeah i have the service manual.  I swear these era of scopes are more complicated  than newer ones
tautech:

--- Quote from: powerstroke7.3 on September 01, 2022, 07:55:31 pm ---yeah i have the service manual.  I swear these era of scopes are more complicated  than newer ones

--- End quote ---
Granted, 100 milli Hertz scopes are certainly a rarity.
powerstroke7.3:

--- Quote from: tautech on September 01, 2022, 08:08:08 pm ---
--- Quote from: powerstroke7.3 on September 01, 2022, 07:55:31 pm ---yeah i have the service manual.  I swear these era of scopes are more complicated  than newer ones

--- End quote ---
Granted, 100 milli Hertz scopes are certainly a rarity.

--- End quote ---
all i see for sale are similar ones or even older 3 digit model #s
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