Electronics > Repair

[SOLVED] HP 34401a - Error 612, 613, 615, 617, 618, 619, 621

<< < (8/22) > >>

Satbeginner:

--- Quote from: Satbeginner on June 22, 2017, 05:08:15 pm ---Hi all,

This thread now seems to be a 34401A repair source, so sorry for me joining as well:

I acquired a 34401A that has the following errors: 612,613,615,617,618,619 and 621.
Both DCV and ACV readings seem to be OK.

Based on the information here, I did some checks and it seems that the second half of u201 (b) has died.
The 7V on r201 and/or r202 when changing ranges is still there, so I ordered some ad706's.

Will keep you posted, in saludo,

Satbeginner (Leo)

--- End quote ---

Hi all,

Today the AD706's arrived, so I could replace U201.

Result?? Yes!! One 34401A back to life, and compared with my HP 3457A well within specs.

I am one happy bunny!

Un saludo,

Satbeginner (Leo)

Samogon:
Good job!
Welcome to the club:)

Zucca:
Satbeginner nice!

When I stared this I had not idea this failure was and is so popular... I have no clue why the U201 is dying so often...  meh... lesson learned always post a fix in the EEVBLOG to help the world.

HighVoltage:
I have replaced a few U201 already and when I get another broken 34401A, this is a first go to check for me now, right after testing the power rails.

With all the information on eevblog about the 34401A repair, it has gotten much easier to fix these great DMMs.

Satbeginner:
I don't get it either, because the "A" half was still working fine. It must have something to do with somebody having applied a (really) high voltage while on ohms setting??

Un saludo a todo.

Navigation

[0] Message Index

[#] Next page

[*] Previous page

There was an error while thanking
Thanking...
Go to full version
Powered by SMFPacks Advanced Attachments Uploader Mod