Agilent DSO6000 series intensity controller part #? - Page 1
Forum section: electronics / testgear

author: Jwalling
author_rank: Unknown
timestamp: February 17, 2019, 12:54:18 pm
content: I'm hoping that someone may be able to ID this encoder. The shaft is broken off.Part is marked B204X1, and it has seven pins which is unusual...Thanks!

author: Carrington
author_rank: Super Contributor
timestamp: February 17, 2019, 05:28:49 pm
content: It is a dual potentiometer, it must be one of these (obsolete):PTV142B20E120AB204 VolumePTV142B20Y120AB204 ToneWhere (B204X1):B -> Linear Taper204 -> Resistance CodeX1-> ?

author: Jwalling
author_rank: Unknown
timestamp: February 18, 2019, 12:27:01 pm
content: At first, I thought you were nuts! A pot in a fairly modern DSO??!!!It is a pot, though. I wonder why they did this?Thank you very much - I never would have found this looking for encoders...

author: 2N3055
author_rank: Super Contributor
timestamp: February 18, 2019, 12:27:57 pm
content: Pot is absolute encoder...

author: Carrington
author_rank: Super Contributor
timestamp: February 18, 2019, 04:52:55 pm
content: @Jwalling:I don't need one, but...Please let us know if you can find a replacement.Some time ago I only found this one:https://www.digikey.com/product-detail/en/tt-electronics-bi/P140KV1-F25BR10K/987-1296-NDNot a 200k one, but it might allow you to replace the broken shaft.

author: HighVoltage
author_rank: Super Contributor
timestamp: February 18, 2019, 05:10:57 pm
content: I am surprised too, to learn that this scope has a dual pot instead of an encoder.Over the years I have replaced may Agilent encoders.Does the Keysight parts website list this potentiometer?May be the scope is too old for that ?

author: Jwalling
author_rank: Unknown
timestamp: February 18, 2019, 06:56:09 pm
content: Quote from: Carrington on February 18, 2019, 04:52:55 pmYep, not a problem. I already bought few 100K linear-taper parts this morning from Onlinecomponents. It would probably work as-is, but I'm going to harvest the shaft from it and put it on the original pot with the 200K resistive elements. They're easy to dis-assemble by bending four tabs. I'll take pictures and post them when I get the part and do the repair.

author: Jwalling
author_rank: Unknown
timestamp: February 18, 2019, 06:59:50 pm
content: Quote from: HighVoltage on February 18, 2019, 05:10:57 pmNo, they don't sell that part. I think the only component level part on the ACQ board that they sell, is the cal protect slide switch which fails all the time in these (and DSO5000A) for some reason. CK 101 series IIRC.

author: Jwalling
author_rank: Unknown
timestamp: February 26, 2019, 02:20:46 pm
content: So I ended up buying QTY 5 part # PTV142B20E120AB104 from onlinecomponents.com for $14.54 USD including shipping. (The shipping was more than the parts...)Rather than trying to use to old element, I put the new 100K part in. It works fine.Thanks very much again, Carrington!

author: euzer
author_rank: Regular Contributor
timestamp: March 13, 2025, 09:07:41 am
content: @JwallingI have a similar defective intensity component on a DSO5014A. I suspect the dial had front impact damage and the plastic on the bezel that surrounds it blistered free. The back plastic face of the pot/encoder is cracked and the dial has a noticeably non-smooth feel when rotated. As such I think the part is beyond repair using donor parts from an non 200k device.Is this likely to be a dual twin taper 200k pot as in this thread? Any suggestions for a replacement, or can a alternative 100k or other value be used in place.TIA

author: HighVoltage
author_rank: Super Contributor
timestamp: March 14, 2025, 09:59:25 am
content: Yes, that one looks indeed like it is not reparable.On many different Agilent instruments (Not just scopes) I have used many different pots and most of the time they worked out perfectly.In the golden days of Agilent, all these special parts could be obtained from their parts department for a very reasonable price.Unfortunately these days are over.