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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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