Metex MS 2000 handyscope - Page 1
Forum section: electronics / testgear

author: microsearch
author_rank: Newbie
timestamp: May 08, 2025, 01:55:11 pm
content: I have been given a metex ms 2000 handyscope to use for fault finding.It works but the 30 year old battery pack is no good, i have purchased the new correct batteries, tryed to put it all back together but couldnt get get continuity between the four 1.2v batteries, upon checking one of the components, a thermal fuse has blown i think.now the issue is that I dont know what the part is, how to work out what it is and were to buy the components.Im looking forward to getting it going so if anyone could help that would brilliant, and would certainly make my dayHope everyone is well.Chris 😊

author: Aldo22
author_rank: Super Contributor
timestamp: May 08, 2025, 02:24:54 pm
content: Why do you want to bother with it?There are much better handheld scopes for very little money.e.g.https://www.aliexpress.com/item/1005007394192248.html

author: tunk
author_rank: Super Contributor
timestamp: May 08, 2025, 02:44:08 pm
content: For an initial test to see if it works, short it.If it's dead, Aldo22's advice is a good one.Or if you need two channels:https://www.eevblog.com/forum/testgear/new-$40-2ch-pocket-scope-2mhz50msps-(august-2023)/And there's a list of cheap scopes here:https://www.eevblog.com/forum/testgear/portable-oscilloscopes-list/There are "70" and "44" on the fuse which could indicate temperature.

author: microsearch
author_rank: Newbie
timestamp: May 08, 2025, 04:16:13 pm
content: Nostalgia I suppose but it is still good for continuity, diode checking that sort of thing, would love to have it working

author: microsearch
author_rank: Newbie
timestamp: May 08, 2025, 04:21:11 pm
content: I will definitely definitley be getting a new one, this has been knocking for ages and deserves second life I think.Can I ask what you mean by 70 and 44 how do I translate that into a part I honestly am nowere near understanding how to either find a replacement or alternative I am new im sad to say I imagine ill look back in year and think jeez lol

author: Aldo22
author_rank: Super Contributor
timestamp: May 08, 2025, 05:11:08 pm
content: I have no idea, but it could be something like this:https://mybatteryplus.com.au/products/thermostat-70-degree-4mm70a-06-replaces-klixon-er470a

author: microsearch
author_rank: Newbie
timestamp: May 08, 2025, 05:32:49 pm
content: thanks for that but if look ill also need a replacement(whatever the small cone shape thing is with the yellow top connected to the klixon IC) do you know what it is ?

author: robert.rozee
author_rank: Frequent Contributor
timestamp: May 09, 2025, 05:01:34 am
content: Quote from: microsearch on May 08, 2025, 05:32:49 pmit is a "microtemp" thermal fuse. in theory they will self-reset when the temperature drops, but rarely do. for examples, see:https://www.ermec.es/Therm-o-disc/ThermalFuseswhen replacing one, it isveryimportant tonotheat up the microtemp's leads, often the leads will be welded or crimped.cheers,rob :-)

author: microsearch
author_rank: Newbie
timestamp: May 09, 2025, 04:45:47 pm
content: I found now thank you it was 98c 10a, I had a thought about soldering the leads to the fuse, im going to use flux and only putting iron on for 2 secs max, as an added bumper so to speak, im going to wet a sponge and put it inbetween were im soldering and the actual component to try minimise any overheating due to excessive heat whe soldering, ill post how i got on when i recieve the fuse. thank you for your help

author: robert.rozee
author_rank: Frequent Contributor
timestamp: May 09, 2025, 04:59:23 pm
content: keep the device leads full-length, and hold with a pair of snipe-nosed pliers between the solder joint and the component to conduct away the heat.years ago, you used to be able to buy what looked like tiny spring-loaded clothes pegs made out of solid metal that you could clip onto a component lead to help conduct the heat away. i doubted anyone even made these any more, but checking i see that goot still do:https://en.goot.jp/products/detail/h_2slcheers,rob :-)

author: microsearch
author_rank: Newbie
timestamp: May 11, 2025, 11:02:59 pm
content: il do that cheers Rob, got fuses yesterday gonna play with that battery pack tomorrow ill keep you posted

author: microsearch
author_rank: Newbie
timestamp: May 15, 2025, 09:36:53 am
content: So update. it all went well until i tried plugging it into meter, could hear little pops, so disconnected and meter which is fine thankfully, think i shoul dof changed diode aswell, I was sloppy. will re update when I get a diode

author: microsearch
author_rank: Newbie
timestamp: June 11, 2025, 07:47:08 pm
content: it turns out the battery pack was fine i had inserted it properly, love this now, would be nice to find a replacement display due to the backlight not functioning.