Electronics > Repair
[Solved!] Agilent E3648A Output 1 not working
Gluteniz:
Hi,
Today when turning on my Agilent E3648A the output 1, only shows -00.38V 0.154A Unreg and can't be adjusted, the normal clicking sound when adjusting is working but no change on voltage.
Little info:
Bought used worked for around five months then blew "GBU8J / IRF540 / IRF2807" underload.
Replaced "GBU8J / IRF540 / IRF2807" on both outputs and after the repair it worked for over a year, but today this problem.
Output 2 works as intended.
Self test passes.
Tried replacing "GBU8J / IRF540 / IRF2807" on Output 1 even though they looked good, but as guessed problem still the same
any guesses, ideas or pointing in the right direction is very appreciated.
IanJ:
Big photos ouch!
Have a look on my YT channel, I have repaired quite a few of these PSU's, a couple with symptoms like yours.
https://youtube.com/playlist?list=PLFTNjqbH_TxkiYsF76ttjXmxgQeXewjSQ&si=sNvLhOM2El-gUDQG
Ian.
Gluteniz:
--- Quote from: IanJ on November 20, 2024, 07:59:54 pm ---Big photos ouch!
Have a look on my YT channel, I have repaired quite a few of these PSU's, a couple with symptoms like yours.
Ian.
--- End quote ---
Oops :-[
Thank you, will check them out!
derZockerMP:
Check the DAC voltages on the test points mentioned in the schematic in the service manual. Also, test the power supply voltages. Follow the path of the DAC signals to the error amps and look for voltages that are not within specifications.
TheDefpom:
I have also done repairs on sister models of this supply, I have a playlist on my YouTube channel which you may want to check out in case there are clues there for you.
https://www.youtube.com/playlist?list=PL2z3V9RkHQE2Twk6VoEBURx88TDXPKVSP
One thing to watch for is that the service manuals have many mistakes in them with values, part numbers, identifiers etc., so always double check everything and compare, as the circuit diagrams are not always correct for these.
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