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Tektronix 2335 Oscilloscope Repair

Discussion in 'Electronic Repair' started by [email protected], Nov 20, 2008.

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  1. Guest

    I have a early 1980's era Tek 2335 here that is in need of repair. I
    know this is a somewhat scarce ruggedized military model, but it may
    be helpful if someone could tell me if there is a more standard model
    that this may be a clone of.

    I have many Tek service manuals, but not for this particular model.
    It would be great if I could troubleshoot from the manual of a
    slightly different model.

    Even advice would be helpful. The symptoms it displays are:

    Beam out of focus. Cannot sharpen, but does take some adjustment.
    Vertical adjustment does not work.
    Straight horizontal line, which does not change on Ch1 or CH2. No
    visible channel seperation.
    Does not respond to input of either AC or DC.
    Brightness varies with sweep frequency.

    I have another scope, so testing is not a difficulty.
     
  2. JW

    JW Guest

    Download the 86MB service manual here:
    http://www.ko4bb.com/cgi-bin/manuals.pl?dir=Tektronix/Tektronix_-_2235

    There's even a txt file with a possible solution for your scopes focus
    problem:

    http://www.ko4bb.com/Manuals/Tektro...onix_2235_Poor_Focus_Problem_and_Solution.txt
    ----- Original Message -----
    From: Jay Sario
    To:
    Sent: Thursday, December 27, 2007 12:28 AM
    Subject: [TekScopes] TEK 2235 no good focus


    Having a 2235 myself, I had found and saved this note from another
    newsgroup:
    Good luck! Adriano
     
  3. JW

    JW Guest

  4. JW

    JW Guest

    And if you get desperate:
    http://yourmanualsource.com/

    90 bucks though. Ouch.
     
  5. Jim Yanik

    Jim Yanik Guest

    No.there's the 2335,2336,2337;all one family.
    An unusual scope,uses a lot of TEK-made ICs(sole source,NLA!),and difficult
    to work on. Not a big seller like 465 or 7000 series.

    I checked BAMA and one other manuals site,and neither had any of the 2300
    manuals.
     
  6. Guest

    I finally set aside time and got inside the HV section.

    I found that the 2335 bears no simarity at all to the 2200 family as
    far as schematics and design.

    There are alot of specially made parts inside the HV section,
    including a thick film resistor combo.

    I may be able to bypass or jury rig something here, but I would need a
    copy of the schematic for the HV section. Are there any links to one?

    Many thanks in advance....
     
  7. JW

    JW Guest

    Well, as I said before, yes. Unfortunately, it doesn't come cheap:
    http://yourmanualsource.com/

    Just be sure to ask them if it contains schematics before you purchase it.
    There's some manual companies who sell service manuals without diagrams...
     
  8. Jim Yanik

    Jim Yanik Guest

    wrote in
    if you have no vertical deflection or positioning,why are you looking at
    the HV section?
     
  9. neon

    neon

    1,325
    0
    Oct 21, 2006
    that old I would not look for a particular bad part I WOULD REPLACE POWER SUPPLY capacitors to begin with. finaly why buy a tek without a manual? do you ever even calibrated the scope ?
     
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