Author Topic: Need help identifying this wire wound? resistor - wierd code  (Read 1348 times)

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Offline wangleseTopic starter

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Need help identifying this wire wound? resistor - wierd code
« on: August 28, 2018, 01:58:58 pm »
Hey eevblog people, apologies for this being my first post, so be nice :P

I'm repairing my son's Shark Lift-Away vacuum cleaner. The rotary brush on the vacuum head seized, (dog hair I think), and a bush broke, and a resistor identified as R6. I THINK it's wirewound, it's ceramic but the colour codes have got me confused.  No, it's blown so my multi-meter gets nothing.
The colour bands are Brown, Green, Gold, Gold, Black (picture)  I've looked for circuit diagrams etc and codes everywhere, but I'm at a loss, and Shark is no help whatsoever. There are pictures of the circuit board I have looked at but I think the resistor varies with country voltage?

Oh, I 3d printed the new bush, and it's fine. Not prepared to plug in the power till I get this bit sorted :-*
 

Online T3sl4co1l

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Re: Need help identifying this wire wound? resistor - wierd code
« Reply #1 on: August 28, 2018, 02:26:24 pm »
1.5 ohms would be the first guess, but the wire seems rather thick for that?  And the black band must be saying something (I don't know what offhand).  May be 0.15 instead?  But I don't know why they wouldn't use a silver band for that.

This says noninductive:
https://electronics.stackexchange.com/questions/330208/what-does-a-black-band-at-the-end-of-a-resistor-mean
which would be 1.5 ohm, NI, and whatever the size suggests, 3W or so I guess?

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Offline wangleseTopic starter

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Re: Need help identifying this wire wound? resistor - wierd code
« Reply #2 on: August 29, 2018, 11:29:59 am »
Hey T3sl4co1l,

that might be the thing. Tanks for finding that.  Since it's a resistor on a driver board for a big motor on the vacuum brush, the non inductive bit might explain it.' I might have to look for a 1.5 Ohm 3W, something with ceramics which should be safe. Can't hurt to try it out. I'll report back. ^-^
 

Online Ian.M

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Re: Need help identifying this wire wound? resistor - wierd code
« Reply #3 on: August 29, 2018, 01:44:32 pm »
There's probably only one break in the wire or metal film element.  Try scraping away enough of the ceramic coating to measure from each lead to the break, which should at least give you an estimate of its value to check against your reading of its colour code
 

Offline Brumby

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Re: Need help identifying this wire wound? resistor - wierd code
« Reply #4 on: August 29, 2018, 02:31:19 pm »
Reading the bands:
Brown. .Green. .Gold. .Gold. .Black
1
5
x 0.15%250ppm

So: 1.5 ohm 5% with 250ppm/ÂșC temperature coefficient
« Last Edit: August 29, 2018, 02:33:05 pm by Brumby »
 


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