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K2 - LED Diffuser Installation Question

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Wesley Inouye

K2 - LED Diffuser Installation Question

Hi,

On 9/12/10, Stan wrote:

"I noticed the LCD backlight assembly is labeled (top down) "A" and "K"
on one side and "K" and "A" on the other side. The corresponding board
positions for D2 and D3 have "+" signs.

The manual doesn't say anything about polarity or even if there is a
"top" and "bottom" to the diffuser; just to install it and ensure it is
exactly 1/8" off the board using the spacers provided.

I just wanted to double check with someone who has already been through
this. Do the "A" and "K" have something to do with polarity? These are
little LEDs and normally polarity is important.
Thanks,

Stan Levandowski WB2LQF"

I've reached the same step and have the same question, but for some reason
my reflector search did not list the responses. Thank you in advance for
your help.

Wes...KH6HRY
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Alexey Kats

Re: K2 - LED Diffuser Installation Question

It's indeed "Anode" and "Kathode" (in German). I checked data sheets for
similar parts on Mouser and LED backlight panels that have "A" and "K" on
them have these leads attached to combined anodes and cathodes of the LED
group. See SSB-COB10025GW<http://www.mouser.com/ProductDetail/Lumex/SSB-COB10025GW/?qs=sGAEpiMZZMvlvmHaYoGmZXTwJQogLTy2wt%2fgFdHF7zk%3d>as
an example.

On Sat, Apr 2, 2011 at 2:54 AM, Wesley Inouye <[hidden email]> wrote:

> Hi,
>
> On 9/12/10, Stan wrote:
>
> "I noticed the LCD backlight assembly is labeled (top down) "A" and "K"
> on one side and "K" and "A" on the other side. The corresponding board
> positions for D2 and D3 have "+" signs.
>
> The manual doesn't say anything about polarity or even if there is a
> "top" and "bottom" to the diffuser; just to install it and ensure it is
> exactly 1/8" off the board using the spacers provided.
>
> I just wanted to double check with someone who has already been through
> this. Do the "A" and "K" have something to do with polarity? These are
> little LEDs and normally polarity is important.
> Thanks,
>
> Stan Levandowski WB2LQF"
>
>
> I've reached the same step and have the same question, but for some reason
> my reflector search did not list the responses. Thank you in advance for
> your help.
>
> Wes...KH6HRY
> ______________________________________________________________
> Elecraft mailing list
> Home: http://mailman.qth.net/mailman/listinfo/elecraft
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:[hidden email]
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>

--
Alexey Kats (neko)
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Wesley Inouye

Re: K2 - LED Diffuser Installation Question

Thanks Alexey. Now it seems obvious, once you pointed it out that is.

Aloha,

Wes...KH6HRY

On Sat, Apr 2, 2011 at 12:38 AM, Alexey Kats <[hidden email]> wrote:

> It's indeed "Anode" and "Kathode" (in German). I checked data sheets for
> similar parts on Mouser and LED backlight panels that have "A" and "K" on
> them have these leads attached to combined anodes and cathodes of the LED
> group. See SSB-COB10025GW<http://www.mouser.com/ProductDetail/Lumex/SSB-COB10025GW/?qs=sGAEpiMZZMvlvmHaYoGmZXTwJQogLTy2wt%2fgFdHF7zk%3d>as an example.
>
> On Sat, Apr 2, 2011 at 2:54 AM, Wesley Inouye <[hidden email]> wrote:
>
>> Hi,
>>
>> On 9/12/10, Stan wrote:
>>
>> "I noticed the LCD backlight assembly is labeled (top down) "A" and "K"
>> on one side and "K" and "A" on the other side. The corresponding board
>> positions for D2 and D3 have "+" signs.
>>
>> The manual doesn't say anything about polarity or even if there is a
>> "top" and "bottom" to the diffuser; just to install it and ensure it is
>> exactly 1/8" off the board using the spacers provided.
>>
>> I just wanted to double check with someone who has already been through
>> this. Do the "A" and "K" have something to do with polarity? These are
>> little LEDs and normally polarity is important.
>> Thanks,
>>
>> Stan Levandowski WB2LQF"
>>
>>
>> I've reached the same step and have the same question, but for some reason
>> my reflector search did not list the responses. Thank you in advance for
>> your help.
>>
>> Wes...KH6HRY
>> ______________________________________________________________
>> Elecraft mailing list
>> Home: http://mailman.qth.net/mailman/listinfo/elecraft
>> Help: http://mailman.qth.net/mmfaq.htm
>> Post: mailto:[hidden email]
>>
>> This list hosted by: http://www.qsl.net
>> Please help support this email list: http://www.qsl.net/donate.html
>>
>
>
>
> --
> Alexey Kats (neko)
>

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Don Wilhelm-4

Re: K2 - LED Diffuser Installation Question

In reply to this post by Wesley Inouye

Wesley,

The board layout along with the orientation of the LEDs assures you that
it cannot be mounted backwards, no matter how it is oriented. Just
follow the manual instructions and all will be OK.

73,
Don W3FPR

On 4/2/2011 5:54 AM, Wesley Inouye wrote: