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| Schematic for Agilent E3630A? |
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| TheSteve:
Bringing this thread back from the dead. Thank you for posting the schematic. I just repaired a broken E3630A from ebay and it came in handy. The -20 volt overload LED was permanently on and the -20 volt supply had no output at all. Both the volt and amp meter were stuck with all segments on. The -20 volt and ground banana jacks were pretty chewed and kind of ripped out from the supply. All of the button caps are also missing. When I received the supply I connected it up and discovered the 0-6 and 0-20 supplies both worked even if the displays didn't. I also noticed a hot smell coming from the unit. My finger quickly located that U9(LM339) was very hot. A little circuit tracing through schematic indicated that U9 handled the overload indication. The voltage to the chip was fine but the reference input used for the -20 volt supply was incorrect. Being the chip was smoking hot I snipped the legs that handled the -20 volt overload indicator. At that point the entire supply came to life including both the volt and amp meter. The rest of the LM339 still worked even. I replaced the LM339 and everything works exactly as it should. The -20 and ground binding posts were repaired as best possible and the supply was reassembled. I will order new key caps from Keysight and possibly some new binding posts but they aren't too bad at this point. The rest of the supply is as new. I had feared the TC14433's would need to be replaced but was pleased to see both worked fine once the bad LM339 was removed. |
| LarryS:
Thank you, I just starting to use EEVBlog for something besides watching the videos. I'll tryout suggestion. Thank you again, larry |
| franksterb92:
Hey do you have those schematics for the hp e3630a the links for them are dead |
| RomDump:
--- Quote from: franksterb92 on September 17, 2023, 07:18:44 am ---Hey do you have those schematics for the hp e3630a the links for them are dead --- End quote --- It looks like they were mirrored on the BAMA archive. https://bama.edebris.com/manuals/hp/e3630a/ |
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