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Thread: ESG D4000A problems


Permlink Replies: 6 - Pages: 1 - Last Post: Dec 4, 2013 5:35 PM Last Post By: jlubecky
sm7ovk

Posts: 53
Registered: 01/24/08
ESG D4000A problems
Posted: Feb 7, 2011 7:43 AM
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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
tabbott


Posts: 1,483
Registered: 07/24/09
Re: ESG D4000A problems
Posted: Feb 9, 2011 9:48 AM   in response to: sm7ovk in response to: sm7ovk
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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.
sm7ovk

Posts: 53
Registered: 01/24/08
Re: ESG D4000A problems
Posted: Mar 19, 2012 2:40 AM   in response to: tabbott in response to: tabbott
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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
tabbott


Posts: 1,483
Registered: 07/24/09
Re: ESG D4000A problems
Posted: Mar 20, 2012 9:55 AM   in response to: sm7ovk in response to: sm7ovk
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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 -
percih70

Posts: 2
Registered: 12/11/12
Re: ESG D4000A problems
Posted: Dec 11, 2012 6:38 AM   in response to: sm7ovk in response to: sm7ovk
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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
sm7ovk

Posts: 53
Registered: 01/24/08
Re: ESG D4000A problems
Posted: Nov 21, 2013 2:08 AM   in response to: percih70 in response to: percih70
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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
jlubecky

Posts: 15
Registered: 08/20/13
Re: ESG D4000A problems
Posted: Dec 4, 2013 5:35 PM   in response to: sm7ovk in response to: sm7ovk
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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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