Products > Test Equipment
HP/Agilent 34970A Teardown
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PTR_1275:
Hi guys,

I have recently bought a 34970 and the front encoder is a bit intermittent. When it works it is picking up every second click. As this is my first 34970 I am not sure if this is normal or not.

I dissasembled and checked the encoder, it has been replaced at some point as the soldering hadn't been cleaned after being re-worked. I looked in the service manual and the part number is ECL0J-C24-SE002. The only reference that I can find on Bourns' site is that it has been replaced with a ROHS version with a L at the end of the part number.

The encoder that is currently in the unit is a ECW1J-B24-AC0024L
I haven't ever worked with encoders nor can I find a breakdown of what the part numbers actually mean, are any of you with more experience able to comment on your thoughts? Are they only meant to pick up every second click? Is there a way for me to test this encoder and get something legible out of the results? What is the difference between the Agilent listed part number and what you have used for your repairs?

Thanks in advance

-Chris
GNU_Ninja:
This data sheet ought to help. http://www.farnell.com/datasheets/1695367.pdf
PTR_1275:
Thank you,

That makes a lot more sense. I put the encoder on the scope just after posting just to see what I could see, I am getting signals on both pins with each detent.

From the data sheet I am making assumptions (If they follow a similar naming convention across their encoders) that the factory encoder doesn't have any detents. If this is the case the user wouldn't know that the unit is waiting for 2 signals from the encoder to increase or decrease, but because this has detents I can tell.

That is of course if the units didn't originally come with detended encoders.

Cheers
-Chris
TiN:

--- Quote ---Semi-rigid flatcable between mainboard and display module.
--- End quote ---

Just reminded me, had same problem before in 33120A, those cable connectors are nasty.

P.S. oops, necrothread...  :)
SteveyG:
Hi free_electron,

I don't suppose you recall the part number for the encoder? I want to replace mine as it's playing up, but want to disassemble, repair and reassemble in one go...
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