Need Some Electronic Repair Help

[KDoug]

Hi,

I'm trying to repair a Dewalt Oscillating tool, and to do that I had to take the circuit board out. I accidentally chipped one of the components trying to get the board out. I've been watching several electronic videos on how to desolder and replace SMD components like this and I've practiced on a scrap circuit board from one of my other power tools. So I've got two questions:

What is this part? I has the number 102 on it.

Where can I get an equivalent replacement?

Sorry if the pictures aren't that great, it was hard to get the camera to focus.

 

[The Cobbler]

looks like a programmable chip,you may be sol on that one

 

[captaindiode]

It looks like an SMD resistor pack. 102 would indicate 1,000 ohms. If you have an digital meter, set it on ohms and measure across the opposing pins. The are four 1,000 (or 1k) ohms resistors in it. I would measure it before I tried replacing and see if you really damaged it.

1 is the first number in the value
0 is the second number in the value
2 means multiply by 100 or add two zeros

 

[MBfreak]

Pic not clear enough for me to really see.
Like captaindiode says, it is probably a SMD 1000 Ohm resistor.
I THINK it is a single resistor, I have not seen SMD´s in " packs " they were quite common on pinconnected resistor packs.
If it is a single resistor, get two solder irons with fine tips and melt both pads while lifting the part.
Clean the pads with solder wick. Hold the new part in correct position and resolder one pad at a time using a very small amount of tin.

Ola

 

[KDoug]

It looks like an SMD resistor pack. 102 would indicate 1,000 ohms. If you have an digital meter, set it on ohms and measure across the opposing pins. The are four 1,000 (or 1k) ohms resistors in it. I would measure it before I tried replacing and see if you really damaged it.

1 is the first number in the value
0 is the second number in the value
2 means multiply by 100 or add two zeros

Thanks, that was very helpful. I read something briefly on the resistor coding but wasn't sure if it applied to my case because I was unsure if it was a resistor or not.

I think it works, I was just wanting to see if I could replace it in case I did any damage to it. I bought all the stuff to do it: ChipQuik and a fine point soldering iron tip. The ChipQuik works good, I tried removing some small resistors on a scrap board I had.

 

[KDoug]

This may be a better picture:

 

[outdoorspace]

https://www.digikey.com/product-detail/en/bourns-inc/CAY16-102J4LF/CAY16-102J4LFCT-ND/3437828

 

[Miss the Pontiacs]

It looks like an SMD resistor pack. 102 would indicate 1,000 ohms. If you have an digital meter, set it on ohms and measure across the opposing pins. The are four 1,000 (or 1k) ohms resistors in it. I would measure it before I tried replacing and see if you really damaged it.

1 is the first number in the value
0 is the second number in the value
2 means multiply by 100 or add two zeros

Wow that is certainly easier than what I remember. Is there much use for the old school method that I had to learn? In the end we didn’t use it much. We would just isolate the problem replace the card, mark the repair tag and it became someone else’s Edit

Further information: List of electronic color code mnemonics
A useful mnemonic matches the first letter of the color code, in numeric order. Here are two that includes tolerance codes gold, silver, and none:

Bad beer rots our young guts but vodka goes well – get some now.[13]
Black Brown ROY of Great Britain had a Very Good Wife who wore Gold and Silver Necklace.
The colors are sorted in the order of the visible light spectrum: red (2), orange (3), yellow (4), green (5), blue (6), violet (7). Black (0) has no energy, brown (1) has a little more, white (9) has everything and grey (8) is like white, but less intense.[14]

 

[captaindiode]

From China:

https://www.ebay.com/itm/50-100-200...hash=item5b467153f1:m:mCDmNnnC1oOc9NtqhA9VpaA


How do they ship so cheap?

I still would try to change it unless it really is damaged. With 4 contact on each side your really need hot air, not an iron. Very easy to burn up the circuit board.

 

[KDoug]

From China:

https://www.ebay.com/itm/50-100-200...hash=item5b467153f1:m:mCDmNnnC1oOc9NtqhA9VpaA


How do they ship so cheap?

I still would try to change it unless it really is damaged. With 4 contact on each side your really need hot air, not an iron. Very easy to burn up the circuit board.

Thanks, how would I know the spacing between the tabs? If I do a google search, what would be the proper nomenclature I should use?

 

[The Cobbler]

...

How do they ship so cheap?

......

I've wondered that too, their shipping must be subsidized by the Gov't

 

[pgray007]

I've wondered that too, their shipping must be subsidized by the Gov't

Incidentally, you’re right. There’s a policy for reduced rate postage from “economically disadvantaged” countries from a couple decades ago. The idea being that you’d give small companies in places like Africa access to US consumers so they could grow small businesses, improve their economies, etc.

Like many good ideas, China is pretty far from the economic backwater it was when the policy was enacted, so now they can ship to the US through the postal system way cheaper than I can ship the same package to the next town over.


Sent from my iPhone using Tapatalk

 

[outdoorspace]

Thanks, how would I know the spacing between the tabs? If I do a google search, what would be the proper nomenclature I should use?

Use a caliper and compare your measurements to the dimensions in the datasheet. By far the most common package for resistor arrays is 0.12" x 0.06".

 

[nehog]

https://www.mouser.com/Passive-Components/Resistors/Resistor-Networks-Arrays/_/N-e89l is another source.

 

[KDoug]

So I finally got around to measuring the resistance on the resistor and I'm consistently measuring .3 ohms. Does that even sound right or do I have my meter set incorrectly?

 

[RPH]

Is the device isolated when measuring? If not, then there is a good chance you’re measuring a parallel path through the circuit. Hardest thing I have with the new guys is to make sure their measuring what they think they are. Surface mount components come in sizes that are 605, 805, and a few others. Wrong size and it won’t fit the pads. Some are the size of ground pepper grains.

 

[ransil]

Size looks like a 0603 or 0805
Hard to tell in a picture
Small chip might not hurt it, if it is bad from chipping/ cracking it will read open.
.3 ohms something not reading right.
Its a resistor array so you need to check all 4 resistors, should be straight across.


Sent from my SM-G920V using Tapatalk

 

[KDoug]

Is the device isolated when measuring? If not, then there is a good chance you’re measuring a parallel path through the circuit. Hardest thing I have with the new guys is to make sure their measuring what they think they are. Surface mount components come in sizes that are 605, 805, and a few others. Wrong size and it won’t fit the pads. Some are the size of ground pepper grains.

If by isolated you mean it's been removed from the board, it hasn't been. CaptainDiode mentioned in a previous post above to measure the resistance while on the board. Don't know if that's right or wrong. There are 3 other resistors just like and they read .3 ohms as well. Unless I'm measuring the wrong pins. The 102 code says that it is supposed to be 1K ohms.

 

[KDoug]

Another picture:

 

[KDoug]

Alright so from what I've gathered from the comments on here is that the resistor should be fine... still bugs me I don't know enough to find an equivalent replacement part.

Anyways, I've got one more part I need to find which was the initial problem. There is a connector on the board that is wired to the battery terminals (with 20 AWG) that burnt out. I thought about soldering the wires directly to the board, but the wire is too big in diameter to fit through the holes on the board. If someone could point me in the right direction with a similar part I'd very much appreciate it. I think it has a 2.5mm pin spacing. There is a lot of parts that come up on Google when I type in "wire to board connector", and I feel lost.

Attached are some pictures.

 

[KDoug]

Since I haven't got a whole lot of replies to this thread, does anybody have a good electronics forum I can ask my questions?

Thanks

 

[ozymandis]

There`s a Russian guy on here who does that kind of thing, send him a message he`s great, his blog`s a good long read. Im sure he would help you.
Find his garage thread I think its called "a small garage in Russia". He repairs allsorts of stuff this is right up his street, he also likes Americans.I cant remember his nickname on here it`s Viouk or Vlouk something like that, short for Vladimir.

 

[KDoug]

There`s a Russian guy on here who does that kind of thing, send him a message he`s great, his blog`s a good long read. Im sure he would help you.
Find his garage thread I think its called "a small garage in Russia". He repairs allsorts of stuff this is right up his street, he also likes Americans.I cant remember his nickname on here it`s Viouk or Vlouk something like that, short for Vladimir.

Thanks, pretty much am wrapping up this project at this point, but will keep that in mind for the future

 

[bluecomputer]

https://www.allaboutcircuits.com/ has a pretty good electronics forum