Electronics > Repair
DSO-X 3024A Power Supply defect
rernexy:
Parts I ordered arrived today. Bought 2 different models of the resistors and capacitor.
Measured the ESR of the cap from the supply and the new ones using an "ESR Meter Mk II" as seen in the photo.
1.4R for the old cap, 0.25R for the new ones.
Measured the capacitance of all of them with various multimeters, all read within 87uF to 95uF.
Then measured capacitance (not ESR) with the LCR45 at different frequencies, theres a few photos of that and a table below.
-OldNewNew (high ripple current)1kHz 46uF87uF84uF15kHz 1.08uF cycled negative to ~110uF cycled negative to ~110uF 200kHz 282nF 6uF but cycled slowly between 5 and 8 uF 5.9uF but cycled slowly between 5 and 8 uF
Here are specific parts I bought:
100uF cap:
LGW2W101MELA25 450V high ripple current https://www.nichicon.co.jp/english/products/pdfs/e-gw.pdf
LGUW6101MELA same as on the supply https://www.nichicon.co.jp/english/products/pdfs/e-gu.pdf
22K resistors:
CRGP2512F22K https://www.te.com/global-en/product-4-2176331-1.html
352122KFT https://www.te.com/global-en/product-8-2176070-1.html
rernexy:
Continuing from previous post, here are scope captures of 200kHz 1Vpp square wave fed into the old cap and the direct equivalent new cap (LGUW6101MELA). Just like what @w2aew demonstrates at https://youtu.be/115erzCCxgE
capture 1: old cap, scope DC coupled
capture 2: old cap, scope AC coupled
capture 3: new cap (LGUW6101MELA), scope DC coupled
capture 4: new cap (LGUW6101MELA), scope AC coupled
Leo Bodnar:
My MSO-X 3024A PSU blew up as well - just now.
Nice consistency Agilent, or Shitsight or whatever you are called now.
Leo
rernexy:
--- Quote from: Leo Bodnar on January 30, 2021, 07:57:23 pm ---My MSO-X 3024A PSU blew up as well - just now.
--- End quote ---
Do you have any photos of what specifically blew up?
How old was your 3024A?
Leo Bodnar:
Looks like synchronous rectification MOSFET.
It's 7-8 years old - obsolete by iPhone standards.
Leo
--- Quote from: rernexy on January 31, 2021, 04:20:54 am ---Do you have any photos of what specifically blew up?
How old was your 3024A?
--- End quote ---
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