Author Topic: Agilent Power Supply 5 Band Color Coded Fuses?  (Read 2887 times)

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Offline AB2ZITopic starter

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Agilent Power Supply 5 Band Color Coded Fuses?
« on: January 22, 2015, 12:39:42 pm »
I'm posting this for a fellow ham on the Yahoo Amatuer Repair forum:
---------------------------------------- His Message ----------------------------
Guys,

I found an issue with my Agilent PS. The ciruit board has two fuses and they are both open for sure. Both are placed close to each other and are identical in markings. I am not able to identify the rating of these two fuses. The fuses look similar to 1/2W carbon resistors and are color coded Brown, Black, Gold, Gold and White. I could not find such fuses in "LittelFuse" catalog. What could they be? Any suggestion?

73
AB3EH
----------------------------------------end of message---------------------------

Anyone have any information I can pass along?

Thanks,
Kevin AB2ZI
Kevin J. Morgan AB2ZI <kmorgan6@optonline.net>
Blog: http://ab2zi.blogspot.com/
Photos http://www.flickr.com/photos/44030661@N03/
 

Offline VK5RC

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Re: Agilent Power Supply 5 Band Color Coded Fuses?
« Reply #1 on: January 22, 2015, 07:58:50 pm »
I was recently repairing my old 6644 (~2000 MY), could they be zero ohm resistors? In my PSU the fuses are green. IF it is a 66xx or 65xx series PSU note that the schematic has parts for most models on the one diagram, you need to refer to the 'parts list' and 'correct ' the schematic. Even then there are differences!
What model and any photos?
Whoah! Watch where that landed we might need it later.
 

Offline AB2ZITopic starter

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Re: Agilent Power Supply 5 Band Color Coded Fuses?
« Reply #2 on: January 22, 2015, 10:21:50 pm »
I was recently repairing my old 6644 (~2000 MY), could they be zero ohm resistors? In my PSU the fuses are green. IF it is a 66xx or 65xx series PSU note that the schematic has parts for most models on the one diagram, you need to refer to the 'parts list' and 'correct ' the schematic. Even then there are differences!
What model and any photos?

lab grade power supply model E3633A

Kevin AB2ZI
Kevin J. Morgan AB2ZI <kmorgan6@optonline.net>
Blog: http://ab2zi.blogspot.com/
Photos http://www.flickr.com/photos/44030661@N03/
 

Offline AB2ZITopic starter

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Re: Agilent Power Supply 5 Band Color Coded Fuses?
« Reply #3 on: January 23, 2015, 03:01:12 pm »
I was recently repairing my old 6644 (~2000 MY), could they be zero ohm resistors? In my PSU the fuses are green. IF it is a 66xx or 65xx series PSU note that the schematic has parts for most models on the one diagram, you need to refer to the 'parts list' and 'correct ' the schematic. Even then there are differences!
What model and any photos?

Here's a photo of the unit and the specific parts circled...

Kevin J. Morgan AB2ZI <kmorgan6@optonline.net>
Blog: http://ab2zi.blogspot.com/
Photos http://www.flickr.com/photos/44030661@N03/
 

Offline wraper

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Re: Agilent Power Supply 5 Band Color Coded Fuses?
« Reply #4 on: January 23, 2015, 03:13:22 pm »
They are fusible resistors. They do not have current rating, only resistance and power in Watts. Therefore you should read the resistance according to the color bands. Considering size they should be 1W or maybe 2W.
 

Offline wraper

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Re: Agilent Power Supply 5 Band Color Coded Fuses?
« Reply #5 on: January 23, 2015, 03:20:02 pm »
1 ohm 5%. Hard to say about what last white band means, probably power rating, this however is out of standard resistor color coding. This resistor is 4 band + 1 something additional, not standard 5 band coding. In 5 band coding, third band cannot be gold or silver (multiplier).
Edit: had a look into datasheets, that white band could mean nothing more than particular resistor series. http://media.digikey.com/PDF/Data%20Sheets/Yageo%20PDFs/FAE%20Series%20Spec.pdf
« Last Edit: January 23, 2015, 03:25:54 pm by wraper »
 

Offline AB2ZITopic starter

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Re: Agilent Power Supply 5 Band Color Coded Fuses?
« Reply #6 on: January 23, 2015, 04:57:31 pm »
Ok, thanks for the information which I will pass along...

All the best,
Kevin AB2ZI
Kevin J. Morgan AB2ZI <kmorgan6@optonline.net>
Blog: http://ab2zi.blogspot.com/
Photos http://www.flickr.com/photos/44030661@N03/
 


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