Electronics > Repair

DSO-X 3024A Power Supply defect

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salvagedcircuitry:
Hey Guys! I found a similar problem with my 3034a oscilloscope power supply. I made a repair video about fixing it. 



Hats off to @DEHiCKA for posting the power supply blog repair link. My current mode controller was completely toast as well.

List of replacement parts:
Datasheet for look-a-like lineage branded power supply. CCH125 series:
http://apps.geindustrial.com/publibrary/checkout/CCH125?TNR=Data%20Sheets%7CCCH125%7CPDF&filename=CCH125.pdf

Genuine Keysight PSU repair part: 0950-5277
https://www.keysight.com/my/partDetail/0950-5277

Original mosfet:
https://www.digikey.com/product-detail/en/stmicroelectronics/STP12NM50/497-2666-5-ND/603691

Replacement mosfet:
https://www.digikey.com/product-detail/en/ixys/IXTP450P2/IXTP450P2-ND/2328313

Two pin Diode package near mosfet:
https://www.digikey.com/product-detail/en/on-semiconductor/MUR860G/MUR860GOS-ND/919926

Current mode controller:
https://www.digikey.com/product-detail/en/on-semiconductor/UC3842BVD1R2G/UC3842BVD1R2GOSCT-ND/5802572

Replacement MOV:
https://www.arrow.com/en/products/v300la20ap/littelfuse

Replacement NTC Varistor:
https://www.arrow.com/en/products/b57237s709m/epcos-tdk

Replacement Fuse:
https://www.digikey.com/product-detail/en/bel-fuse-inc/MRT-6-3AMMO/507-1119-1-ND/4794478

Replacement 1w 22k resistor under main filter capacitor:
https://www.arrow.com/en/products/erj-1tyj223u/panasonic

Tall cap I selected:
https://www.digikey.com/products/en?keywords=ucy2w101mhd

Dimensionally compatible cap:
https://www.digikey.com/product-detail/en/rubycon/450VXH100MEFCSN22X25/1189-2028-ND/3564971

Power Supply Replacement Candidates:
Meanwell RPS-300-12
Meanwell RPS-400-12
Meanwell EPP-300-12
Will need ps_on inverted:
Meanwell RPSG-160-12
Murata PQC250-12

mlloyd1:
so, is anybody seeing this issue on the 3000T models (yet)? :(

mlloyd1

TheSteve:

--- Quote from: mlloyd1 on May 07, 2020, 03:20:57 pm ---so, is anybody seeing this issue on the 3000T models (yet)? :(

mlloyd1

--- End quote ---

The 3000t series uses a different power supply that so far doesn't appear to have any issues.

salvagedcircuitry:

--- Quote from: TheSteve on May 07, 2020, 04:33:22 pm ---
--- Quote from: mlloyd1 on May 07, 2020, 03:20:57 pm ---so, is anybody seeing this issue on the 3000T models (yet)? :(

mlloyd1

--- End quote ---

The 3000t series uses a different power supply that so far doesn't appear to have any issues.

--- End quote ---

Dave's early review shows the same lineage power supply @2:23


Granted, they could have changed it out later on (I hope they did).

TheSteve:
Keysight has confirmed in the past that they have changed it. I know my 3024T has a different model supply. Perhaps it was after production had started.

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