You learn a lot by repairing them, you learn how they work and a lot about troubleshooting in general.So far I have 3 that I have repaired, a B&K Precision 2120 20Mhz 2 channel, a Tektronix 2221A 2 channel 100Mhz and a Hitachi V-1150 4 channel 150Mhz. I don't know how different the sweep circuit is on the 2160, my 2120 doesn't have the delayed time base.It is worth keeping around if you do get another scope, having a working one is really helpful for repairing a broken one. Could just be aging components like capacitors. Likely not that big of a deal.Hard to say about the sweep problem. Bk Precision 20 Mhz Oscilloscope Model 2120 Manual Guide The channel 2 problem was likely operator error, might have blown the vertical amplifier circuit on that channel. If there is no movement then that channel is dead. If the dot moves vertically at all on channel 1 then it is a CRT horizontal drive problem.You can repeat the same test on channel 2, however the dot should move vertically.
If this all seems normal than the problem is in the sweep circuit, not the CRT horizontal drive. If you center the dot and set the scope to 1V/div and apply -5V to the input the dot should move all the way to the left without moving vertically, +5V will make it go right. The dot should move right or left depending on whether it is + or - and should not move vertically. Put the scope in X.Y mode and apply a voltage to the channel 1 input. I don't know how similar yours is, but on my 2120 the sweep circuit needs quite a few rails, the +5V, +/-12V and +24.You can isolate the sweep circuit from the CRT horizontal drive circuit.
Bk Precision 20 Mhz Oscilloscope Model 2120 Manual Pdf If you have a supply problem then there can be all kinds of weirdness. Everything you need to worry about should be under 300V, 260V is the highest my 2120 has apart from the HV to the tube.Checking your power rails is one of the first steps of troubleshooting. No need to mess with the high voltage points. You're getting a nice bright trace, your high voltage is fine. A subreddit dedicated to news, articles and general discussions related to the field of.Rules.The focal point of your post should be related to the subject of component-level electronic engineering as supported by the post tags / flairs below.
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