Onoff Posted April 13, 2019 Share Posted April 13, 2019 Anyone got a Hitachi drill charger model UC18YRL/YFL? Resistor on board fried beyond recognition/testing. Only 4 screws on the back to take a look for me. Cheers Link to comment Share on other sites More sharing options...
newhome Posted April 13, 2019 Share Posted April 13, 2019 I have a UC24YFA Link to comment Share on other sites More sharing options...
Onoff Posted April 13, 2019 Author Share Posted April 13, 2019 2 minutes ago, newhome said: I have a UC24YFA So close but no banana! Almost certainly different. Here's the complete board: Link to comment Share on other sites More sharing options...
newhome Posted April 13, 2019 Share Posted April 13, 2019 That's a relief cos I now don't need to stress about getting the screws out! Link to comment Share on other sites More sharing options...
dpmiller Posted April 13, 2019 Share Posted April 13, 2019 brown back orange? 1 Link to comment Share on other sites More sharing options...
ProDave Posted April 13, 2019 Share Posted April 13, 2019 = 10K ohm (10,000 ohms) If it has burnt out, it almost certainly means something else has gone. but worth a try. I would not be at all surprise if FET1 was dead. 1 Link to comment Share on other sites More sharing options...
Onoff Posted April 13, 2019 Author Share Posted April 13, 2019 Thanks all! Looks like @dpmiller found the same link. But is it brown/black/ORANGE? Looks almost brown/black/brown... Some confusion between 1k & 10K... http://www.fixya.com/support/t8214626-resister_r8_hitachi_uc18yrl_charger1st answer says:"Hi Mark,R8 Should be a 1000 Ohm 1/4Watt resistorRgds Ray"A bit further down:R8 looks like a 10K 1/4 watt resistor.Then:"The values that i read:R3 = 4.7 ohm, savety 1/4 WR4 = 47 ohm, savety 1/4 WR8 = 1 k ohm, 1/8 W (seen on working PCB) R9 = 0.47 ohm, savety 1/2 Wthese resistors and Fet: 2SK2996 were defective" Link to comment Share on other sites More sharing options...
Onoff Posted April 13, 2019 Author Share Posted April 13, 2019 I'm erring towards it being 1k so brown/black/red... ??? Link to comment Share on other sites More sharing options...
dpmiller Posted April 14, 2019 Share Posted April 14, 2019 I'd be erring towards a new charger... Link to comment Share on other sites More sharing options...
Onoff Posted April 14, 2019 Author Share Posted April 14, 2019 1 hour ago, dpmiller said: I'd be erring towards a new charger... Me too but it's not mine and the owner's tight! Link to comment Share on other sites More sharing options...
Ed Davies Posted April 14, 2019 Share Posted April 14, 2019 Glad it's not just me that finds resistor colour codes difficult to distinguish. Link to comment Share on other sites More sharing options...
ProDave Posted April 14, 2019 Share Posted April 14, 2019 It needs someone with a working one to probe it with a multimeter. some resistor colour bands can go odd colours if the resitor is routinely running hot. Link to comment Share on other sites More sharing options...
Onoff Posted April 14, 2019 Author Share Posted April 14, 2019 16 minutes ago, Ed Davies said: Glad it's not just me that finds resistor colour codes difficult to distinguish. The old 4 band ones were easy, at a glance. Link to comment Share on other sites More sharing options...
Jeremy Harris Posted April 14, 2019 Share Posted April 14, 2019 2 hours ago, Onoff said: The old 4 band ones were easy, at a glance. Yes, they were, also the colours were easier to distinguish. I can think in the old colour codes, and look through a box of resistors and subconsciously view them in terms of value, without having to think about converting colours to numbers (might be a side effect of synesthesia, though, as I think of words as colours anyway, today is black, being Sunday). The newer, dark coloured, resistors, with the new (well, ~20 year old now) colour code are a lot harder to decode, and often seem to need both mental effort and a magnifying glass. I find the new brown and red bands particularly challenging to distinguish. I'm not colour blind either, but can sense what it might be like to be colour blind when trying to decode these, especially some of the dark background MF12 series ones. Link to comment Share on other sites More sharing options...
Onoff Posted April 14, 2019 Author Share Posted April 14, 2019 41 minutes ago, JSHarris said: Yes, they were, also the colours were easier to distinguish. I can think in the old colour codes, and look through a box of resistors and subconsciously view them in terms of value, without having to think about converting colours to numbers (might be a side effect of synesthesia, though, as I think of words as colours anyway, today is black, being Sunday). The newer, dark coloured, resistors, with the new (well, ~20 year old now) colour code are a lot harder to decode, and often seem to need both mental effort and a magnifying glass. I find the new brown and red bands particularly challenging to distinguish. I'm not colour blind either, but can sense what it might be like to be colour blind when trying to decode these, especially some of the dark background MF12 series ones. I was about 12 I think and more interested in scavenging old tvs, hi-fis or anything with a plug from dumps and tips than anything at school. As payment for digging a neighbours footings me and a mate got breakfast bought for us in some cafe in Deptford opposite the doss house. He got cash on top, I got the whole E12 range of resistors from Garlands! Link to comment Share on other sites More sharing options...
dpmiller Posted April 14, 2019 Share Posted April 14, 2019 I've still got the remains of an E12 pack from John Bull's... Link to comment Share on other sites More sharing options...
Onoff Posted April 14, 2019 Author Share Posted April 14, 2019 5 minutes ago, dpmiller said: I've still got the remains of an E12 pack from John Bull's... Stephensons in Bromley, Rapid in Eynsford, Filmers in Dartford....God I loved old school electronics shops! Bi-Pak, Greenweld, TK Electronics... Then Maplin came along and killed them all. Link to comment Share on other sites More sharing options...
dpmiller Posted April 14, 2019 Share Posted April 14, 2019 Indeed. And everybody sold the same Altai stuff. As a teenager, I worked in an electronics repair shop- TV, video, group gear, CB. The Boss made a proposition to Maplin which they flat out refused. It was another ten years before they appeared in NI. Still, we had access to RS, CPC, HRS, Willowvale as well as as a couple of local distributors of tat... Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now