Agilent Keysight 3034a X-Series Oscilloscope Repair

[salvagedcircuitry]

Hey Guys! I made a repair video about fixing a faulty Agilent / Keysight 2000a/3000a x-series power supply



Massive thanks to my fellow eevblog members. This thread inspired me to create this video, as it seems that the 2000a/3000a oscilloscope power supplies have a few different failure modes.
Relevant EEVblog forum thread:
https://www.eevblog.com/forum/repair/dso-x-3024a-power-supply-defect/


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

Keysight InfiniiVision 3000 X-Series Oscilloscope Firmware (latest)
https://www.keysight.com/main/software.jspx?cc=US&lc=eng&ckey=2014548&nid=-32976.970765.02&id=2014548

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

Power supply retrofits:
https://www.digikey.com/en/products/detail/mean-well-usa-inc/RPS-300-12/7706051
https://www.digikey.com/en/products/detail/mean-well-usa-inc/RPS-400-12/7706061
Will need ps_on inverted:
https://www.digikey.com/en/products/detail/mean-well-usa-inc/RPSG-160-12/7706116
https://www.digikey.com/en/products/detail/murata-power-solutions-inc/PQC250-12/6873845

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

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


Let me know what you think!

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