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Oscilloscope Channel Not Working


A few years ago I found this wonderful Tektronix manual on (analog) oscilloscope diagnostics appropriately titled Troubleshooting Your Oscilloscope [pdf]. It may not be a problem, it might be that you don't have the controls set right. It only services to adjust the low frequency compensation trimmer on 10x/100x probes. A trigger problem might result in a mess of waveforms overlaid instead of a single crisp shape while a Z-axis amplifier problem would affect the intensity of the beam.

Perhaps it is time for a digital upgrade anyway... Newer Post Older Post Home Subscribe to: Post Comments (Atom) Recent Posts Loading... See the scope manual for more details Logged EpicIntelGamer Regular Contributor Posts: 178 Country: Re: Tektronix 2235 Oscilloscope Channel Repair Help « Reply #10 on: July 31, 2013, 09:00:26 AM Although it is thinking about it, wouldn't electrostatic plates might have the exact opposite problem (obviously to a lesser degree), leading to the exact same problem: bandwidth?Since the plates work with

Common Oscilloscope Problems

I had hoped for an issue outside the MCU. Please be positive and constructive. The only relevant things I can think of to calibrate it is the scope itself and a 555 chip I have, I dont have a function generator or anything. « Last I would think the input channels would be electrically the same so if I use the same probe on both inputs and get two different results I have to believe one

  • Logged w2aew Super Contributor Posts: 1435 Country: I usTa cuDnt speL enjinere, noW I aR wuN Re: troubleshooting analog oscilloscope « Reply #1 on: December 17, 2012, 01:11:43 AM »
  • You may also see a beam that is deflected to the far right or left despite adjustment.
  • I will need to plug it is and then follow Dave's (from EEVBlog)rule: "Thou shalt test voltages"!Nothing appears obviously burned out on any of the other boards from what I can
  • My 1590A has none of these issues.
  • Aug 26 '12 at 19:18 @RyanB. - see edits - try it on 1V/div and also the suggested 20mV/div but with 100mV pk-pk signal.
  • Your cache administrator is webmaster.
  • On the block diagram PDF, these are labeled as "channel [A or B] signal pre-amp"It seems like according to the block diagram, that only after those 2 input amps that the
  • So, now what?

And it works with high voltage, that would explain the loud noise. How??? Channel 2 has very sharp edges once the compensation is complete. Oscilloscope No Horizontal Sweep Logged kg4arn Supporter Posts: 211 Country: Re: troubleshooting analog oscilloscope « Reply #11 on: June 01, 2013, 10:48:09 PM » You may need a second working scope so that you

Oscilloscopes are designed and built in blocks of circuits. Oscilloscope Troubleshooting Circuit steveastrouk1 year agoReplySounds like you have blown the Y amp on both channels. -max- (author)  steveastrouk1 year agoReplyHow would both Y amps fail though? Please be positive and constructive. The only alternative I seem to have is to go back to V7.0 as this is the only scope I have.Thank you in advance.Robert Lewis 0 Kudos Message 1 of 3

I get a good squarewave but it doesn't vertically go as far as it should, however measuring DC voltages with the scope seems pretty accurate. Oscilloscope Crt Not Working Logged darthtony Contributor Posts: 22 Country: Re: troubleshooting analog oscilloscope « Reply #13 on: June 02, 2013, 11:40:46 PM » Cleaning the trigger level pot didnt do anything.After a lot Still, zipittee-doo-daa nothin' at all.-max- (author)  iceng1 year agoReplyIt seems to be something other than that. Female has wings while male does not Fields for which there exist multivariable polynomials vanishing at single specified point The meaning of 'already' in the sentence 'Let's go already!' Attack and

Oscilloscope Troubleshooting Circuit

The only problems remaining on this oscilloscope are my 1) lac of actual probes, 2) missing clear plastic indicator with numbers on it that should be around the knob of the Look for the trigger circuit and check every stage step by step. Common Oscilloscope Problems There is usually a small screw on the probe that you turn to make this adjustment. Oscilloscope Troubleshooting Guide Also I forgot to mention a small blueish purplish wire was next to it, similarly just sticking out the scope.

When I had the scope opened up earlier today I was examination the rotary switches used. Hot Network Questions The pun worked in English, but what was it in Japanese? If you know what the blocks are and what they do, you can identify which block is causing problems. HORIZ DISPLAY has nothing to do with MODE. Oscilloscope No Trace

Pressing HORIZ DISPLAY A should switch to the A time base. You might find block diagrams, schematics for each board, and maybe a schematic showing connections between all the boards. Hotels on the Las Vegas strip: is there a commitment to gamble? I wasn't even trying to change the MODE.

I never use ADD or SINGLE so those aren't an issue. Tektronix Oscilloscope Repair I'd also try a divider on the compensation signal to make it so the full waveform is on the screen at 20mV/div, just in case it's a problem specific to that Use an isolating transformer and keep one hand in your pant pocket.

After checking out the menu structure I decided to compensate the probes.

Yes, I made it! Logged eak Contributor Posts: 8 Country: Re: troubleshooting analog oscilloscope « Reply #15 on: February 05, 2014, 04:56:14 AM » I have the same problem with triggering on my hm Like the MCU isn't detecting the polling signal.I noticed after posting that this behavior is intermittent, though. Oscilloscope Repair Services With a better sense of all the boards involved, I started tracing individual switch pins on the schematic.

Otis Active Participant ‎06-03-2005 07:24 PM Options Mark as New Bookmark Subscribe Subscribe to RSS Feed Highlight Print Email to a Friend Report to a Moderator Hello Robert,From what I'm understanding Any sugestions as to what to check futher?-max- (author)  -max-1 year agoReplyUPDATE: Discovered today that some driver transistors, which are mounted to heat sinks, are overheating. Your cache administrator is webmaster. this contact form No vertical deflection) ❾ Vertical controls for both channels have stopped working ❿ Dual trace shows only one trace ⓫ I have not been able to do anything

between 5V/DIV and 0.2V/DIV the signal isnt displayed as it should.when i go from 0.2V to 0.5V div you expect the signal to have a dicreased display amplitude, however it suddenly There is no solder mask, greyish white, and there are no silkscreened values or numbers.I traced both the wire and the connector and ribbon cable to the same mod board, which You might be able to use the probe cal output together with a frequency counter to calibrate the timebase, although the jitter might be too high for that. That should be fairly accurate unless the scope has severe issues.

Repairable????I went to my workbench today to discover that my BK Precision 30MHz analog scope has stopped working. Logged darthtony Contributor Posts: 22 Country: Re: troubleshooting analog oscilloscope « Reply #10 on: June 01, 2013, 08:58:02 AM » no the external trigger doesnt work either. Instead it switches on X-Y where the CH1 input deflects the beam vertically and CH2 deflects it horizontally. more stack exchange communities company blog Stack Exchange Inbox Reputation and Badges sign up log in tour help Tour Start here for a quick overview of the site Help Center Detailed

or is everything electrostatic based? (I can see how maintaining constant current through a coil would require more power than contant voltage on a plate)steveastrouk -max-1 year agoReplyNo, AFAIR, its all done What would cause them to fail, I mean?Also, I should note that the XY does work, only in the X direction. I'm guessing you have adjusted the vertical position to zoom in at the top of the waveform. Channel2 –Ryan B.

If you're lucky you'll also find part numbers and descriptions for each of the many components on the boards. Alternatively, I may let the scope sit awhile. Logged edavid Super Contributor Posts: 1972 Country: Re: troubleshooting analog oscilloscope « Reply #12 on: June 02, 2013, 02:34:27 AM » Quote from: darthtony on June 01, 2013, 08:58:02 AMno Power Supply As with many electronics, if the power supply goes bad, all sorts of problems occur.

I will do further examination, and plug it in and probe where there were some red and black wires tacked on to the connector for the mod board.~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~p.s. Where do we start? EEVblog Electronics Community Forum A Free & Open Forum For Electronics Enthusiasts & Professionals Welcome, Guest.