Author Topic: 34401A test failures (many)  (Read 9339 times)

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Offline motocoder

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Re: 34401A test failures (many)
« Reply #25 on: August 02, 2015, 04:36:56 pm »
There's one listing on ebay. I haven't used this vendor before, so standard caveats apply.

http://www.ebay.com/itm/1SK6-0001-DIP-8-/361222471615?pt=LH_DefaultDomain_0&hash=item541a897fbf

Yes, I saw that one. I sent him a "Best Offer" yesterday, but no reply yet. Thanks.
 

Offline chihaxinh

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Re: 34401A test failures (many)
« Reply #26 on: August 05, 2015, 02:41:49 am »
If you have part and replace U101 , what do you think error can relative with U102 ?

How to check U102 dead or alive when DMM power on ?
 

Offline motocoder

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Re: 34401A test failures (many)
« Reply #27 on: August 05, 2015, 02:46:12 am »
If you have part and replace U101 , what do you think error can relative with U102 ?

How to check U102 dead or alive when DMM power on ?

U102 may have an issue, but I can see that the meter is basically reading OK - it's just stuck on the wrong range because U101 is not processing the serial data.
 

Offline alsetalokin4017

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Re: 34401A test failures (many)
« Reply #28 on: August 05, 2015, 03:55:40 am »
Another alternative:

http://www.utsource.net/ic-datasheet/1SK6-0001-9914.html

I've made several orders from UTSource and have always been happy. It's kind of hard to figure out their price structure though; I don't see a price listed for this part but apparently they do have it. You might email them with an inquiry; the ebay seller price shocked me.
The easiest person to fool is yourself. -- Richard Feynman
 

Offline motocoder

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Re: 34401A test failures (many)
« Reply #29 on: August 05, 2015, 04:17:55 am »
Another alternative:

http://www.utsource.net/ic-datasheet/1SK6-0001-9914.html

I've made several orders from UTSource and have always been happy. It's kind of hard to figure out their price structure though; I don't see a price listed for this part but apparently they do have it. You might email them with an inquiry; the ebay seller price shocked me.

I sent them a RFQ several days ago. They quoted me $80 for the part. No thanks!
 

Offline motocoder

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Re: 34401A test failures (many)
« Reply #30 on: August 16, 2015, 04:34:39 am »
I got what I hope is not a counterfeit replacement part for U101 from an eBay seller. I replaced it, and now I am getting error #604.

Is there a way to verify that U101 is functioning correctly?

I saw another post here that this was caused by a bad U201, U102, and some zeners. It looks like the previous owner already replaced U201, and checking the voltages on its pins, it seems to be working.

I notice that the voltage across CR203 is 4.58V. Schematic says this is a 5.1V zener. I know the zener voltage does vary with current, but that seems pretty far off.
 


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