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ESG D4000A problems

Question asked by sm7ovk on Feb 7, 2011
Latest reply on Jan 29, 2016 by BurkettC

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Hi,

I'm trying to repair a ESG signal generator. Error is most probably on board 4400 60002 where there are some MMICs marked 641. Does anybody has a CLIP or knows what type of MMICs this is? Could it be MGA-64135, (?).

There is also another ic at the output from this board. It might be U203 but I'm not sure. What type of IC is this? Golden flatpack with 8 pins.

The fault is that the 9V is badly loaded by this board and perhaps somebody has seen this error before?

Regards
Jens

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tabbott Feb 9, 2011 8:48 AM
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Hi Jens -

I do not have a positive reply for you.

The ESG D4000A is an obsolete product, and there is no CLIP that can be found or obtained.

The defective board, E4400-60002 is also not available to purchase.

Sorry for the bad news.
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- sm7ovk @ tabbott on Mar 19, 2012 1:40 AM
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  Hi,
  
  I looked at the ESG again this weekend. Before I scrap the unit - does anybody have the E4400-90336.pdf?
  Apparently this is with schematics and perhaps this would be the last chance for my unit. The ESG will be used for ham-radio experiments only so there is no commercial interest in this.
  This time when I started it there isn't any text at all on the screen. It seems to get light on but the contrast/light can't be adjusted - computer failure too?
  
  Regards, 73
  Jens
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  - tabbott @ sm7ovk on Mar 20, 2012 8:55 AM
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    Hi Jens -
    
    Here’s the ESG-C Service Guide link:- http://cp.literature.agilent.com/litweb/pdf/E4400-90335.pdf
    In the Service Guide, you can refer to the Front Panel Display Troubleshooting to aid you in the display issue that you are seeing.
    
    Regards -
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  - percih70 @ sm7ovk on Dec 11, 2012 5:38 AM
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    Hello Jens
    
    RE: E4400B circuit drawings
    
    Did you ever succeed in locating all or part of the manual E4400-90336.pdf?
    
    I too have a E4400B, this time with a suspected faulty pulse mod circuit,
    
    I'm after circuit drawings for the A9 output board, & A11 reference board, (the ESG-A versions).
    
    Again, the generator is for Ham Radio use, so unless I can locate the drawings, it will be beyond economic repair, shame as its a very nice generator, but I couldn't justify the 400usd on the full manual.
    
    any info much appreciated at percival.harry(at)gmail.com
    
    Regards
    
    Harry
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    - sm7ovk @ percih70 on Nov 21, 2013 1:08 AM
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      Hello Harry,
      
      I'm sorry for a very late answer, but I'm normally not checking the signal source part of the forum.
      I didn't found the E4400-90336.pdf and I would also use my generator for ham radio. My unit is scrapped and I couldn't get my hands on any spareparts at resonable prices.
      73
      Jens, SM7OVK
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      - jlubecky @ sm7ovk on Dec 4, 2013 4:35 PM
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        This is most likely to late to help but I looked at the schematics and Yes the 641 is MGA-64135 The U203 is the final amp out. 9v driving it.
        This board (p/n E4400-60002 Synthesizer) is available on ebay for 300 I repair these ESGs but for that price I'd just get the board and move on. maybe remove the final amp and see if supply comes back up.
        I hope this helps.
        
        Joe Lubecky
        Test Equipment Plus
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        BurkettC @ jlubecky on Jan 29, 2016 6:14 PM
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        Old thread, but it would be great if someone could make the CLIP (or doc with schematics) available for the E4400 series of sig gens. E4400-90336 is apparently the name but Googling has turned up nothing....
        
        Edit: Apparently E4400-90336 is for the E4400B series. I'd like the E4400A & B.
        
        Edited by: BurkettC on Jan 29, 2016 7:13 PM
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