EEVblog Electronics Community Forum
Electronics => Repair => Topic started by: WB8PFZ on January 12, 2025, 08:06:03 pm
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Thinking I looked everywhere for a schematic for a HP 3400 ac voltmeter board. Found a few but not the one I have :( . Mine has six what look like transistors.
Thanks Mike HP part number 03400-66507 no revision number
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Search for "3400A" on Artek's site: https://artekmanuals.com/manuals/hp-manuals/
The latest one they have is manual version 03400-90013 which will cover revision 03400-66503 of that board (Video Amplifier Assembly). I haven't seen a revision -66507 of that board - it has stayed the same through the latest models of the 3400A that I have so I would assume that the circuit in the Artek manual should be very close to the same.
Hal
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january 1970 edition manual last page mentioned about -66507. :-+
schematic is shown on page 44.
also,
Change A7 Board Assembly - Power Supply to -hp- Part No. 03400-66505.
NOTE: -hp- Part No. 03400-66507 is directly interchangeable with 03400-66505.
https://pearl-hifi.com/06_Lit_Archive/15_Mfrs_Publications/20_HP_Agilent/01_HP_3400B_20MHZ_True_RMS_Voltmeter/HP_3400A_Op_Serv_1968.pdf
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Thanks for all the info. My 75 volt rail has 83 volts. Not sure why or if this will be an issue? Mike