Agilent DSO1012A Rotary encoder replacement - Page 1
Forum section: electronics / repair

author: ltktomas
author_rank: Contributor
timestamp: January 02, 2016, 06:01:20 am
content: Hi, I have this oscilloscope for a few years and because I use it a quite often, the rotary encoder on channel 1 is doing what it wants and second channel is starting to do so. I have decided to replace them with a new ones, but don't know the exact type or it's parameters.Does anyone know what type should I order from Farnell ? (I would prefer ALPS)Thank you, Tom

author: tautech
author_rank: Super Contributor
timestamp: January 02, 2016, 06:49:00 am
content: Welcome to the forum.All I can suggest is to search the web for teardowns or reviews that might have pics so you can identify them.Or be patient, many here are on holiday and for the right member to see this thread might take a while.Good luck.

author: VK5RC
author_rank: Unknown
timestamp: January 02, 2016, 11:36:58 am
content: Hi,Sorry I can't help either, Agilent/Keysight's "Service" manuals are so useless nowadays, not like in the 1970 and 1980s.It may be worth trying at the Yahoo group "HP/Agilent Equipment" as well.Rob C

author: HighVoltage
author_rank: Super Contributor
timestamp: January 02, 2016, 11:47:03 am
content: Most likely it is an encoder that is used in other Agilent instruments.I would take it apart and take a few pictures of the encoder and post it here.You can also open the encoder and clean it and it will probably work as new afterwards.These encoders have been a problem in many agilent instruments.

author: ltktomas
author_rank: Contributor
timestamp: January 09, 2016, 03:49:03 pm
content: Hi,I have finally taken it apart. Here is some pictures.I want to replace encoders with metal (grey) head for new ones. Does anyone know what type is that ?Dimensions of encoder: 12.5 mm × 13 mm, 7 mm height, shaft diametr 6 mm, shaft lenght 8/9 mm, manufacturer is probably ALPS.Thank you for any information.

author: ltktomas
author_rank: Contributor
timestamp: January 09, 2016, 03:53:49 pm
content: Some more pictures of PCB and chips:

author: fanOfeeDIY
author_rank: Unknown
timestamp: January 13, 2016, 05:22:29 pm
content: Quote from: ltktomas on January 09, 2016, 03:49:03 pmI have a feeling that you might able to find the high quality metal encoder from here.http://www.alps.com/prod/info/E/HTML/Encoder/Incremental/EC11/EC11_list.html

author: fanOfeeDIY
author_rank: Unknown
timestamp: January 13, 2016, 05:27:51 pm
content: Quote from: fanOfeeDIY on January 13, 2016, 05:22:29 pmEC11K perhaps?http://www.alps.com/prod/info/E/PDF/Switch/Encoder/EC11/EC11.PDF

author: ltktomas
author_rank: Contributor
timestamp: January 13, 2016, 10:54:48 pm
content: After a long searching, I found Bourns PEC12R-4120F-S0012 (for Volts/Div and Time/Div control) and Bourns PEC12R-4020F-S0024 (all other encoders)I've just got the order from Mouser today and it's them. Control of the oscilloscope finally works precisely again.

author: fanOfeeDIY
author_rank: Unknown
timestamp: January 16, 2016, 01:19:28 pm
content: Quote from: ltktomas on January 13, 2016, 10:54:48 pmNice!

author: fanOfeeDIY
author_rank: Unknown
timestamp: January 16, 2016, 01:28:35 pm
content: Quote from: fanOfeeDIY on January 16, 2016, 01:19:28 pmI couldn't find 20mm length rotary encoder from ALPS too