Author Topic: HP 8904A - Front Panel Replacement LEDs?  (Read 627 times)

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Offline Wil_BloodworthTopic starter

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HP 8904A - Front Panel Replacement LEDs?
« on: May 17, 2024, 02:50:46 pm »
Anyone know where I can find replacements for the LEDs on the front panel of the 8904A?

2215261-0

Thanks!

- Wil
 

Offline rfengg

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Re: HP 8904A - Front Panel Replacement LEDs?
« Reply #1 on: May 17, 2024, 08:30:25 pm »
« Last Edit: May 17, 2024, 08:39:24 pm by rfengg »
 
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Offline Wil_BloodworthTopic starter

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Re: HP 8904A - Front Panel Replacement LEDs?
« Reply #2 on: May 17, 2024, 08:38:31 pm »
Aren't these standard 5mm RED LED's?

a) https://www.mouser.com/ProductDetail/Kingbright/WP56BID?qs=58z0TXQGVSSigALogKJCBg%3D%3D

or even

b) https://a.co/d/clpXEMH

Well, they're not red... more of an orange-ish yellow.  But I'm not sure if they're "standard"... gonna have to pull it apart and see I guess.

And they're 3mm at most... nowhere near 5mm.

- Wil
« Last Edit: May 17, 2024, 08:40:33 pm by Wil_Bloodworth »
 

Offline rfengg

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Re: HP 8904A - Front Panel Replacement LEDs?
« Reply #3 on: May 17, 2024, 08:40:13 pm »
Looked at some pics online , and they do look a bit orangy in some pics and red in others.....but anyways looks more like red.
BTW, if you bias a red led too high, they do have an orange tinge......
« Last Edit: May 17, 2024, 08:43:04 pm by rfengg »
 

Offline Wil_BloodworthTopic starter

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Re: HP 8904A - Front Panel Replacement LEDs?
« Reply #4 on: May 17, 2024, 08:42:49 pm »
Nope.

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Offline rfengg

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Re: HP 8904A - Front Panel Replacement LEDs?
« Reply #5 on: May 17, 2024, 08:50:50 pm »
Yes, your pic shows them orangish indeed.....here's one from another site.....anyways, are you bothered too much about the color?

Here's one at Mouser which has a red lens but has a orange-red emission.

https://www.mouser.com/datasheet/2/776/BL_BJE5V4V_AT-3074580.pdf
« Last Edit: May 17, 2024, 08:56:26 pm by rfengg »
 

Offline Wil_BloodworthTopic starter

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Re: HP 8904A - Front Panel Replacement LEDs?
« Reply #6 on: May 17, 2024, 09:01:27 pm »
Yes, your pic shows them orangish indeed.....here's one from another site.....anyways, are you bothered too much about the color?

Here's one at Mouser which has a red lens but has a orange-red emission.

https://www.mouser.com/datasheet/2/776/BL_BJE5V4V_AT-3074580.pdf

Nah, I don't care about the color... one of them is smashed and I just want it to work.  It would be nice if all four were the same... just because I'm OCD.  This weekend, I'm going to pull the cover off and measure one of them more accurately.  Thanks for the links!

- Wil
 

Offline Lstkartagi

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Re: HP 8904A - Front Panel Replacement LEDs?
« Reply #7 on: May 17, 2024, 09:29:09 pm »
The 8904A service manual including parts and schematics is online: https://www.keysight.com/us/en/assets/9018-40471/reference-guides/9018-40471.pdf hmm, but I don't see the LEDs at first glance.
« Last Edit: May 17, 2024, 09:34:59 pm by Lstkartagi »
 

Offline Wil_BloodworthTopic starter

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Re: HP 8904A - Front Panel Replacement LEDs?
« Reply #8 on: May 17, 2024, 11:24:25 pm »
Yes, I looked in the service manual first and didn’t find anything.

- Wil
 

Offline xrunner

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Re: HP 8904A - Front Panel Replacement LEDs?
« Reply #9 on: May 17, 2024, 11:35:24 pm »
Anyone know where I can find replacements for the LEDs on the front panel of the 8904A?

I have one of those units. They are just 3mm yellow LEDs nothing special. Available pretty much anywhere LEDs are sold.
I told my friends I could teach them to be funny, but they all just laughed at me.
 
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Offline Wil_BloodworthTopic starter

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Re: HP 8904A - Front Panel Replacement LEDs?
« Reply #10 on: May 18, 2024, 03:26:09 am »
Sweet! Thank you!

- Wil
 

Online coppercone2

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Re: HP 8904A - Front Panel Replacement LEDs?
« Reply #11 on: May 18, 2024, 04:16:32 am »
i have that too, i think they look a little smokey or something. dirty yellow
 
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