FLUKE 89 IV true rms multimeter powers, measures nothing - Page 1
Forum section: electronics / repair

author: vicusa99
author_rank: Newbie
timestamp: October 15, 2018, 10:06:55 pm
content: Last time it was successfully used, until i battery contact was broke by mistakeNeed to repair the battery contact that WAS BROKEN, SO NOT HAVING NEW REPLACEMENT I SOLDER DIRECT A WIRED TO THE MULTI. PCB battery contacts + -I test to measure some resistance or voltageBut it shows 0.00 ohm, or 0 volts it beeps when switching to beep mode. It should read OL, before start.Switching to voltage gives 0.00.Thought at times, it might rush around displaying any number, both it resistance and voltage mode. But for the most 0.00 and it does not matter what the test leads do. Open, connected to something or shorted.Fuses are checked, batteries changed. Still the same.So it seems like something in the input stage might have a break / gap.Anyone have any idea of which component to investigate more or try to change??

author: coromonadalix
author_rank: Super Contributor
timestamp: October 15, 2018, 10:34:51 pm
content: Are you sure the dial is in the right position ?I had dismantled my meters to change the super caps, i mistakenly turned the dial one position, once re-assembled it did not work okay ?You can find an complete battery connectors kits on Ebay (the 5 parts kit) 59$ usd plus shipping ? and after a few weeks some new kits re-appears ?https://www.ebay.com/itm/FLUKE-87-4-89-4-187-189-789-MultiMeter-Battery-Contact-Kit-OEM-NEW/253325696665

author: vicusa99
author_rank: Newbie
timestamp: October 15, 2018, 11:34:40 pm
content: I can turn the dial differents position...Can you explain more.Yes i saw the conectors on ebay but quite expensive. Thanks any ways.If make read imput , itest some of the resistor and are reading ok.My concern is multimeter is not show input values only 0Screen and everything work.

author: The Soulman
author_rank: Super Contributor
timestamp: October 15, 2018, 11:57:42 pm
content: Quote from: vicusa99 on October 15, 2018, 11:34:40 pmTurn the dial 180 degrees and reassemble. (the contacts on both ends of the dial are probably slightly different)

author: retiredcaps
author_rank: Super Contributor
timestamp: October 16, 2018, 12:24:22 am
content: Quote from: vicusa99 on October 15, 2018, 10:06:55 pmShow us a picture with the rotary dial set to ohms and the lcd screen readout. Do the same for DCV and have the probes measuring a 1.5AA cell.

author: vicusa99
author_rank: Newbie
timestamp: October 16, 2018, 05:46:52 pm
content: Hi here some picsfirst 3 are the Resistance without measuring or not a Resistance + foto #3 continuity doesn't either readlast 3 pics are dc of a battery same behavior.Many thanks for moving more tips.

author: retiredcaps
author_rank: Super Contributor
timestamp: October 16, 2018, 07:13:54 pm
content: Assuming the rotary dial is setup correctly, here are some suggestions.1. check the input protection components "in circuit"a) fusible resistor should measure 1k ohmhttp://mrmodemhead.com/blog/fluke-87-fusible-resistor/b) PTC should measure around 1.1k ohmc) MOVs and spark gap should all measure 0L ohms2. If the battery contact was broken due to alkaline battery leakage, it would be a good idea to carefully inspect the entire pcb. An IPA bath might help if you see any alkaline leakage.

author: ElecSeb
author_rank: Regular Contributor
timestamp: October 22, 2018, 11:20:09 am
content: Wiresfluke89IV-3.jpg -> is that yellow/orange element cracked? (not quite visible on your picture)

author: Samogon
author_rank: Frequent Contributor
timestamp: October 22, 2018, 03:38:50 pm
content: Quote from: ElecSeb on October 22, 2018, 11:20:09 amIt is slit, so called spark gap

author: Samogon
author_rank: Frequent Contributor
timestamp: October 22, 2018, 03:52:07 pm
content: Vicusa99,I think that ADC is kaput, i have spare mainboard to get IC from it, but looking at battery contacts being destroyed i see big expense here.Ebay seller ~$50 for contacts setShipment and IC donor, not even counting labor

author: Robomeds
author_rank: Frequent Contributor
timestamp: October 23, 2018, 04:16:39 am
content: Are you sure the switch has all it's contacts? I didn't notice a missing contact with mine until it didn't work correctly. The problem seemed to be the meter didn't understand what it was supposed to do because only some of the connections made by the dial were actually being switched. Check out my thread on it.https://www.eevblog.com/forum/repair/fluke-187-switch-contacts/msg1093086/#msg1093086You might have the same issue.

author: vicusa99
author_rank: Newbie
timestamp: November 05, 2018, 03:26:40 pm
content: inner knob switch contact are missing. 2 of 4. i thinks that is maybe the problem, the issue would be the contacts, i didnt noticed until watching other pics from another unit on your site. where i cant found them_, Ebay doesnt have .also the external know is broke.

author: lowimpedance
author_rank: Super Contributor
timestamp: November 05, 2018, 10:59:11 pm
content: Both contacts missing !!. As this meter was apparently working before the battery wire mod , did you have the switch rotor assembly out at any time during that mod ?. If so the contacts clearly have fallen out.Have you had avery good lookaround the area where you have been working on this meter ?. Otherwise replacement contacts will most likely have to be from a donor Fluke with similar contacts. Not sure you would have much joy contacting Fluke directly, (give it a try though).

author: coromonadalix
author_rank: Super Contributor
timestamp: November 05, 2018, 11:09:33 pm
content: Quote from: vicusa99 on November 05, 2018, 03:26:40 pmYou miss clearly 2 contacts, the dial has 4 contacts, fluke usa has the battery contacts, not the dial contacts (tried to order them - no longer available), i ordered all the clips from them 1 1/2 month agopn 89-4-8006 is the small lenght battery clippn 89-4-8012 are the 3 dual battery clipspn 89-4-8003 is the longest battery clipYou will end around 60$ usd for the complete clips kitAn used working Fluke 187-189 / 87IV-89IV meter is easily 125$ usd or more ? , before you buy you must have a photo of the contacts, many used meters have them corroded ...

author: Robomeds
author_rank: Frequent Contributor
timestamp: November 08, 2018, 04:10:54 am
content: As I mentioned in my thread on almost the same issue, I contacted some of the ebay sellers and was able to get a contact. Per my other thread it was Ebay seller Fluke-USA that had one. I had to just contact them through the messaging system. It wasn't on their ebay store.

author: Robomeds
author_rank: Frequent Contributor
timestamp: November 08, 2018, 04:18:56 am
content: No idea who this seller is (I found it via an image search) but those 87-5 contacts look like they may be the same parts as the 89-4. That said, I don't think those are actually 87-5 contacts. Other 87-5 pictures don't show the same contacts nor do they have the back wiper.https://pakmuhandes.com/fluke_test_mearument_equipments)/fluke_accessories?product_id=621Yup... 87-3. Check out this threadhttps://www.eevblog.com/forum/buysellwanted/wtb-(ukeu)-rotary-switch-contacts-for-fluke-87-iii/

author: coromonadalix
author_rank: Super Contributor
timestamp: November 08, 2018, 10:25:06 am
content: Tried to source the dial contacts, many fakes websites china related .......... be careful you'll get some deceptions, never had any emails answers after lots of trialsMy solution was to buy used / defective meters to source them.