Author Topic: EEVblog #540 - HP35670A DSA Repair - Part 4  (Read 22117 times)

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Offline mikerj

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Re: EEVblog #540 - HP35670A DSA Repair - Part 4
« Reply #50 on: June 14, 2015, 07:07:10 am »
. Can't you just remove and replace all the op-amps and try to see if it works? Surely they can't be that expensive.

Already suggested on page 1 of this thread.  The AD845's are $7 each, and there are a lot of them.
 

Offline c4757p

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Re: EEVblog #540 - HP35670A DSA Repair - Part 4
« Reply #51 on: June 14, 2015, 07:10:59 am »
As well as proprietary chips on the same rails, I believe.
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Online EEVblog

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Re: EEVblog #540 - HP35670A DSA Repair - Part 4
« Reply #52 on: June 14, 2015, 09:45:13 am »
Dave, I have done similar to this board and worse without schematics. Can't you just remove and replace all the op-amps and try to see if it works? Surely they can't be that expensive. A vacuum desolder station helps rather than solder-wick. As far as the ASIC/CPLD well you're of course SOL.

They are expensive, but I could socket them and put in cheaper one to test. And yes, if it's not them and it and ASIC or whatever them I'm screwed, the odds of that are high. There is a ton of stuff on that rail that I'm pretty sure went sky high, it could be anything. I've already spent enough time on it, I couldn't be bothered any more.
 

Offline Quarlo Klobrigney

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Re: EEVblog #540 - HP35670A DSA Repair - Part 4
« Reply #53 on: June 14, 2015, 10:12:17 pm »
Sorry, I was trying to offer encouragement, not to foster anger or frustration. Maybe at a later date when things cool off you'll try again, or maybe one of the kind intertoob people will provide the unobtainium parts it needs. Either way keep on keepin' on.
Voltage, does not flow, nor does it go.
 

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Re: EEVblog #540 - HP35670A DSA Repair - Part 4
« Reply #54 on: June 14, 2015, 10:32:27 pm »
Sorry, I was trying to offer encouragement, not to foster anger or frustration. Maybe at a later date when things cool off you'll try again, or maybe one of the kind intertoob people will provide the unobtainium parts it needs. Either way keep on keepin' on.

 

Offline TheDefpom

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Re: EEVblog #540 - HP35670A DSA Repair - Part 4
« Reply #55 on: September 12, 2016, 09:37:27 pm »
Dave, if you have given up on this, perhaps you could send it my way to have a crack it it?


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