[Boatanchors] [collins_radios] Simpson 260 Assistance Needed

[David Knepper]

I am still hunting for the problem with my 270 - not 260- which was my mistake.

I have received many suggestions/tips and they are all most appreciated.

I will report what I find in a few days.  My 270 has worked flawlessly but all of a sudden the RX1 scale will not zero when the leads are "shorted."  The needle sits on half scale with little movement when I turn the zeroing pot on the front panel.

Replaced battery with a new EverReady and tested all the resistors with another meter.  This unit even smells new with absolutely no corrosion on the battery terminals.  It had all the indications of a weak battery but that is not the problem.

Now that I have a schematic I can begin to really troubleshoot the meter.

More later ... 

Thanks to all those that responded to my email.

David Knepper, W3CRA/W3ST
Collins Radio Associaton - Join Today
www.collinsra.com
Editor of the Collins Journal
Secretary of the Collins Radio Association
See us on Facebook:  Collins Radio Association

  ----- Original Message ----- 
  From: JACK BREWER 
  To: collins_radios at yahoogroups.com 
  Sent: Wednesday, September 28, 2011 6:21 PM
  Subject: Re: [collins_radios] Simpson 260 Assistance Needed


    

  What position is the main selector in and what scale also what position are the other selectors in ? One of my main jobs for Conrail Corp was repairing  Simpson meters. Do you have a complete schematic or the abreviated one that usually comes with the meter?



  From: David Knepper <collinsradio at comcast.net>
  To: collins_radios at yahoogroups.com
  Sent: Wednesday, September 28, 2011 5:50 PM
  Subject: Re: [collins_radios] Simpson 260 Assistance Needed


    
   
  Jack, it is a Simpson 270 and yes, when you touch the leads, you are setting the meter for infinity.

  The meter stays in the middle of the scale with some variation when you ajust the pot.

  Thanks

  David Knepper, W3CRA/W3ST
  Collins Radio Associaton - Join Today
  www.collinsra.com
  Editor of the Collins Journal
  Secretary of the Collins Radio Association
  See us on Facebook:  Collins Radio Association

    ----- Original Message ----- 
    From: JACK BREWER 
    To: collins_radios at yahoogroups.com 
    Sent: Wednesday, September 28, 2011 5:08 PM
    Subject: Re: [collins_radios] Simpson 260 Assistance Needed


      
    I have rebuilt many of these meters. I don't understand what you are trying to do .you should get 0 with the leads shorted and infinity with the leads open. I take it that you are using the ohms position and scale.



    From: David Knepper <collinsradio at comcast.net>
    To: boatanchors at mailman.qth.net; collins_radios at yahoogroups.com; amateur-repairs at yahoogroups.com
    Sent: Tuesday, September 27, 2011 9:12 AM
    Subject: [collins_radios] Simpson 260 Assistance Needed


      
    I have a problem with my late model Simpson 260 multimeter

    Although I have replaced the 1.5 volt battery, I still cannot adjust the meter movement to infinity when the two leads are shorted.  

    I have to dig out my instruction book that just has the schematic.  

    I suspect a bad resistor but that is just a guess.

    There has to be a technician among these three groups that can assist me.

    Thank you

    David Knepper, W3CRA/W3ST
    Collins Radio Associaton - Join Today
    www.collinsra.com
    Editor of the Collins Journal
    Secretary of the Collins Radio Association
    See us on Facebook:  Collins Radio Association








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