Re: [Elecraft] K2 - LED Diffuser Installation Question

[Don Wilhelm]

  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:
> 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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Re: [Elecraft] K2 - LED Diffuser Installation Question

[Wesley Inouye]

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  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-COB10025GWas
>  an example.
>
>  On Sat, Apr 2, 2011 at 2:54 AM, Wesley Inouye  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:Elecraft@mailman.qth.net
>>
>> 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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Re: [Elecraft] K2 - LED Diffuser Installation Question

[Alexey Kats]

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-COB10025GWas
an example.

On Sat, Apr 2, 2011 at 2:54 AM, Wesley Inouye  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:Elecraft@mailman.qth.net
>
> 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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[Elecraft] K2 - LED Diffuser Installation Question

[Wesley Inouye]

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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[Elecraft] K2 - LED Diffuser Installation Question-END OF THREAD

[stan levandowski]

Thanks, everybody!

Stan Levandowski WB2LQF
HF QRP CW -- Doing more with less for over 50 years!
QCWA #35038   OOTC #4558   NAQCC #4740   SKCC #6488   FISTS #(Pending)
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[Elecraft] K2 - LED Diffuser Installation Question

[stan levandowski]

Things are going very well. Completed the Control Board and now wrapping 
up the Front Panel Board.

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.

ALSO -- the manual says, "Do not remove the backing from either side of 
the diffuser"  AND IT NEVER MENTIONS THE BACKING AGAIN.  But surely it 
has to come off before the LCD is installed over top of it!!  May I 
assume I can remove the front and rear backings from the diffuser after 
I've soldered it and before I install the LCD?

  Advice here surely appreciated!

Thanks,

Stan Levandowski WB2LQF
HF QRP CW -- Doing more with less for over 50 years!
QCWA #35038   OOTC #4558   NAQCC #4740   SKCC #6488   FISTS #(Pending)
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Re: [Elecraft] K2 led diffuser

[Bob Nielsen]

On Jul 7, 2006, at 1:02 PM, Masleid, Michael A. wrote:


Hello Arie

My K2 was a few serial numbers before yours.

The layers in my kit were:

The LCD:

Polarizer (remove this and it is ruined)
Glass
Liquid Crystal stuff
Glass substrate with lots of pins
Transflective Layer (looks a bit like metal foil - don't mess with it)




I recall that there is a very thin plastic sheet over the polarizer.   
It was a bit hard to tell and I inadvertently removed the polarizer  
(I'm sure I'm not the only one).  I ordered another but stuck it back  
on so I could continue until the new one arrived.  The old one is  
still working fine 3+ years later, but I have a spare if I ever need it.


73 - Bob, N7XY
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RE: [Elecraft] K2 led diffuser

[Masleid, Michael A.]

Hello Arie

My K2 was a few serial numbers before yours.

The layers in my kit were:

The LCD:

Polarizer (remove this and it is ruined)
Glass
Liquid Crystal stuff
Glass substrate with lots of pins
Transflective Layer (looks a bit like metal foil - don't mess with it)  

The Back Light:

Thin milky film half stuck to clear plastic diffuser, kind of wrinkled
Clear plastic diffuser with LEDs stuck to it
Thick white material (not attached well, but it is important to leave it on 
there)

I tried to straighten out the milky film but it only got worse, so I
decided to leave it off.  My guess is that it might help even out the light
if you leave it on, but I didn't want to look at the wrinkles forever.
I figure it was in there to prevent scratches - but I could be wrong.
I wonder how many encountered this?

Michael, AB9GV

>I'm building K2  # 3612 . Question about the led diffuser.

>The back side has a thick foil. The front side is much more thinner, a milky
>thin foil which is a bit loose from the glass.
>Is it right to leave the thin foil on there, or should it be taken off. I'm
>not sure.
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[Elecraft] K2 led diffuser

[Arie Kleingeld PA3A]

I'm building K2  # 3612 . Question about the led diffuser.

The back side has a thick foil. The front side is much more thinner, a milky
thin foil which is a bit loose from the glass.
Is it right to leave the thin foil on there, or should it be taken off. I'm
not sure.

Thanks in advance.

73,
Arie PA3A
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