Problem with Fluke 233 - Page 1
Forum section: electronics / repair

author: kdl1950
author_rank: Contributor
timestamp: January 08, 2022, 06:28:24 pm
content: Hi guys,I bought a Fluke 233 cheaply. The batteries in the display have run out. Thus the connections and the circuit board were damaged. Was able to clean everything so far and bring it back in order.Only I have two problems:1. The previous owner destroyed the L201 coil. For whatever reason.could someone tell me which SMD coil is suitable?Possibly also U202 and Q206?I think, I have some problems with the Voltage.When the battery voltage is high, it always restarts and the wireless function does not work either. It works fine with weaker batteries.The coil is currently bridged.2. the buzzer does not work. It is shown in the display. When I switch over in the resistance measurement. Unfortunately there is no sound. Does anyone have an idea of ​​how to troubleshoot?Thanks in advance

author: TekForever
author_rank: Contributor
timestamp: January 08, 2022, 08:05:52 pm
content: Hey.I believe I have a Fluke 233 at home. I can check to see if I can read the component labels later -- currently out of the home getting some stuff done.

author: kdl1950
author_rank: Contributor
timestamp: January 08, 2022, 08:39:56 pm
content: Hey TekForever,Thank you for the quick response and help.There's no hurry. Is just a craft project.Greetings from Germany

author: TekForever
author_rank: Contributor
timestamp: January 09, 2022, 01:15:40 am
content: Base. See next post for display

author: TekForever
author_rank: Contributor
timestamp: January 09, 2022, 01:18:57 am
content: Wait I'm an idiot. I just realized you were talking about the display lol. Here's pictures of that. Hope this helps.I can also try to see if I can talk to some guys on Monday. I'll try to keep this in mind when I get into work.

author: kdl1950
author_rank: Contributor
timestamp: January 09, 2022, 03:57:13 pm
content: Hi there,okay it should be 100 µH?But what kind of resistance should it have? There are so many different.Do you have a reverence type? DC/DC Typ of course.Another question. Can you give me an exact picture of the battery connections? Like my picture.I'm not sure whether the connection of the transmitter diode DS202 comes directly from the negative pole.I also found out that the connection problem or restarting the display is not too high but too low a voltage.Unfortunately the batteries run out relatively quickly. Even though the meter is turned off. After 1-2 hours, the radio mode can no longer be used because the voltage has dropped too far.Does anyone have an idea?

author: srmahaffy
author_rank: Contributor
timestamp: January 12, 2022, 03:54:05 pm
content: Hi, sorry to jump on your post, but wondering if you can give me some information on your Fluke 233. I’m currently looking at one on eBay that needs repair that I want to fix. It is missing the battery covers (on the base and display unit). Can you tell me if the magnet part of the display unit is just the battery cover?? (Want to know if I will not have the magnet feature of the display while I get a replacement cover if I purchase the meter). Thank you!!

author: kdl1950
author_rank: Contributor
timestamp: January 13, 2022, 07:47:28 pm
content: Hello,the magnet is in the battery cover.See the picture.

author: kdl1950
author_rank: Contributor
timestamp: January 13, 2022, 07:48:46 pm
content: Backside

author: colourlessgreenideas
author_rank: Newbie
timestamp: March 31, 2022, 04:59:05 am
content: Quote from: kdl1950 on January 09, 2022, 03:57:13 pmYes, it is 100 uH.Quote from: kdl1950 on January 09, 2022, 03:57:13 pmYes, DS202 is connected between R212 & GND.Quote from: kdl1950 on January 09, 2022, 03:57:13 pmProbably because you shorted out L201. That's the inductor for the PSU boost converter.

author: kdl1950
author_rank: Contributor
timestamp: April 17, 2022, 06:19:32 pm
content: Hi Guys,thank you for your help.The measuring device runs perfectly again.Coil renewed and the missing ground connection.Battery consumption is now normal.Special thanks to colourlessgreenideasVery good forum.Greetings from Germany