Electronic Circuits and Projects Forum



Oscilliscope repair

12 Last »
  1. 14th September 2005 08:10 PM #1
    jrz126 jrz126 is offline

    Oscilliscope repair

    I just bought another oscope off ebay to repair the one I have with the broken CRT.

    The one I bought has a few problems...according to the auction, it fails the self tests for CCD, PA, and Trigs.

    The scope that I have now passes (well it passed before it broke) all of the selftests.

    Am I better off just swapping the CRT or should I try to fix the problems on the one that I am about to recieve (maybe by swapping circuit boards)?

    I do have the service/repair manual, so I should be able to figure it out.

    I'm a noob when it comes to ocsope repair, so Im hoping there are some of you out there with some experience
    Jeff
    To the optimist, the glass is half full.
    To the pessimist, the glass is half empty.
    To the engineer, the glass is twice as big as it needs to be.
  2. 14th September 2005 10:07 PM #2
    JimB JimB is offline
    I would swap the tube.
    Your first scope was working until it was dropped, the most likely thing to break is the tube.
    So, swap the tube and see what happens.

    JimB
    0
    Experience is directly proportional to the value of the equipment ruined.
  3. 15th September 2005 03:00 PM #3
    1st Mil-tech 1st Mil-tech is offline
    Yep just replace the CRT, less time and aggravation and no calibration would be needed.
    0
  4. 15th September 2005 03:43 PM Thread Starter #4
    jrz126 jrz126 is offline
    You're positive that I dont need to recalibrate? I emailed somebody from tektronics awhile back and they said I would have to.
    0
    Jeff
    To the optimist, the glass is half full.
    To the pessimist, the glass is half empty.
    To the engineer, the glass is twice as big as it needs to be.
  5. 15th September 2005 04:50 PM #5
    Nigel Goodwin Nigel Goodwin is offline
    Super Moderator
    Quote Originally Posted by jrz126
    You're positive that I dont need to recalibrate? I emailed somebody from tektronics awhile back and they said I would have to.
    Changing the CRT will obviously change the calibration, but it might even be closer than it was before - so don't worry about it!.

    Bear in mind you can only read a scope scale to a fairly poor degree of accuracy, so if the scope is slightly out it doesn't matter that much.
    0
    PIC programmer software, and PIC Tutorials at:
    http://www.winpicprog.co.uk
  6. 15th September 2005 10:45 PM #6
    1st Mil-tech 1st Mil-tech is offline
    of course you would get that reply from Tek, silly me, their interest is only in the equipment working to specs. Oh no! you mean there's a, what price did you say,service charge?

    Don't get me wrong, I used to work for em and they are a quality oreinted company, but you may be able to buy a refurbished one for less than the calibration costs.

    The beam adjust controls are analog so whats to calibrate?
    0
  7. 16th September 2005 11:53 PM #7
    Dean Huster Dean Huster is offline
    OK, "1st Mil-tech", your little pic has brought back a flood of old memories, but I can't sort them out. That was a crystal radio, right? Who made it? As I recall, it was just a tuner and what appear to be other knobs aren't?

    Dean
    0
    Dean Huster, Electronics Curmudgeon
    Contributing Editor emeritus, "Q & A", of the former "Poptronics" magazine (formerly "Popular Electronics" and "Electronics Now" magazines).

    R.I.P.
  8. 17th September 2005 04:08 AM Thread Starter #8
    jrz126 jrz126 is offline
    The service manual has a 'display adjustment' section. There are quite a few adjustments to be made...like on the time base display board there are 9 pots...Integrate time, Vert vector comp, Horiz gain, vertical gain, vert spot wobble...ect.

    Will l have to adjust these? (these are what I was referring to when I was talking about calibrating)

    Fed-ex says it should be delivered tomorrow
    0
    Jeff
    To the optimist, the glass is half full.
    To the pessimist, the glass is half empty.
    To the engineer, the glass is twice as big as it needs to be.
  9. 17th September 2005 08:08 AM #9
    Nigel Goodwin Nigel Goodwin is offline
    Super Moderator
    Quote Originally Posted by jrz126
    The service manual has a 'display adjustment' section. There are quite a few adjustments to be made...like on the time base display board there are 9 pots...Integrate time, Vert vector comp, Horiz gain, vertical gain, vert spot wobble...ect.

    Will l have to adjust these? (these are what I was referring to when I was talking about calibrating)
    Don't worry about them! - bang the tube in and see how it works, if they do need adjusting?, what have you got to adjust them against anyway?.

    However, most adjustments probably won't be required, and it will probably be close enough as it is.
    0
    PIC programmer software, and PIC Tutorials at:
    http://www.winpicprog.co.uk
  10. 18th September 2005 05:59 PM Thread Starter #10
    jrz126 jrz126 is offline
    Just got it all put back together and it looks pretty good, all of the tests pass.

    It feels kinda weird tearing into something that you paid $200 for only a few minutes after it is delivered to your house.
    0
    Jeff
    To the optimist, the glass is half full.
    To the pessimist, the glass is half empty.
    To the engineer, the glass is twice as big as it needs to be.
12 Last »
Tags
« Configure PIC16F628 | SONY DVP-NS765P service menu »
Electronic Circuits  |  Learning Electronics

Join our community with over 100,000 Members! It's free, easy and when you're logged in you have many more features! Click to register.
Page Time: 0.10329 seconds      Memory: 7,622 KB      Queries: 15      Templates: 0