Fluke 89 IV: How to know the knob/switch position? - Page 1
Forum section: electronics / repair

author: EvanShultz
author_rank: Newbie
timestamp: February 25, 2019, 05:46:17 pm
content: I have a Fluke 89 IV with the knob removed from the switch. The little while plastic mount for the knob was broken and, since it's pulled out, I don't know how to align the switch and knob. (The meter doesn't work now but eventually I would be able to figure it out...)It appears that I can find a small screw and use that to secure the two white plastic parts that form the "stem" from the knob. Then I should be able to push the knob + stem back into the switch and everything should be fine. At least, that's my plan so far. Any suggestions here are welcome, but the big reason why I opened this topic is: does anybody know the proper orientation of the knob and switch? I do not know how the switch would be positioned when the knob is turned to "OFF", for example.

author: ModemHead
author_rank: Frequent Contributor
timestamp: February 25, 2019, 06:39:31 pm
content: This is an 87-IV and the switch is in the OFF position.

author: psykok
author_rank: Frequent Contributor
timestamp: February 25, 2019, 07:10:40 pm
content: I contacted Fluke support this morning to know what could be done for my 89 IVI just got the answer, 87 and 89 serie IV are not under support any more and not eligible for any kind of repair.In place they offer me to buy a 289 for a discounted price. The price is not bad but unfortunately still too expensive for me.

author: EvanShultz
author_rank: Newbie
timestamp: February 25, 2019, 07:16:02 pm
content: Quote from: ModemHead on February 25, 2019, 06:39:31 pmFabulous! Thank you!

author: EvanShultz
author_rank: Newbie
timestamp: November 16, 2021, 02:43:33 pm
content: I finally found the motivation to try and wrap this up. I put the knob and spring-selection-switch part on the front and back of the front cover together with a screw.It does work, but the knob is a little wobbly and doesn't have the nice, tight, precision feel it should have. So now I have a working meter.However, it would really be nice to get the proper knob since this is a nice meter. Does anyone know where to look? It appears the Fluke 189 also has the same front cover as the 89 IV. I didn't find it on eBay and I contacted other sellers with covers to no avail. Broken 89 IV and 189 meters are still expensive, and I don't need the guts. Thoughts?

author: commongrounder
author_rank: Frequent Contributor
timestamp: November 16, 2021, 07:47:48 pm
content: I wonder if a replacement for the broken part could be 3D printed? I once took a broken unusual plastic potentiometer shaft to a Maker Place operation. I had them scan the pieces, and they did a great job of printing a replacement. Cost me $20.00US.

author: floobydust
author_rank: Super Contributor
timestamp: November 16, 2021, 09:06:47 pm
content: I have seen plastic hex pcb spacers and hex rods at the hobby shops. Maybe measure it and see, if it's a common size like 1/4".https://www.keyelco.com/category.cfm/keyelco/Spacers-Standoffs/id/495and McMaster Carr.It does see a lot of torque so a 3D print might not be strong enough? Or get an 87V part.

author: EvanShultz
author_rank: Newbie
timestamp: November 17, 2021, 07:26:02 am
content: Thanks for the suggestions!I'm not sure a 3D printed part would work either. But good idea.The problem seems to be that the white-ish plastic hex part is also the indicator on the knob. So the dark plastic of the knob is seemingly an overmoulding. Getting it out and fitting in a hex spacer might be challenging. But it could be worth a shot. Thanks for the suggestion, and I'll use the meter as it is for a while to see how it holds up before trying anything else.