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Electronics => Repair => Topic started by: WB8PFZ on January 12, 2025, 08:06:03 pm

Title: Searching for HP schematic 03400-66507 HP3400 RMS voltmeter power supply 6 trans
Post by: WB8PFZ on January 12, 2025, 08:06:03 pm
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
Title: Re: Searching for HP schematic 03400-66507 HP3400 RMS voltmeter power supply 6 trans
Post by: HalFoster on January 13, 2025, 12:49:43 pm
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
Title: Re: Searching for HP schematic 03400-66507 HP3400 RMS voltmeter power supply 6 trans
Post by: squadchannel on January 13, 2025, 01:32:31 pm
january 1970 edition manual last page mentioned about -66507. :-+

schematic is shown on page 44.

also,
Quote
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
Title: Re: Searching for HP schematic 03400-66507 HP3400 RMS voltmeter power supply 6 trans
Post by: WB8PFZ on January 14, 2025, 06:01:47 pm
Thanks for all the info. My 75 volt rail has 83 volts. Not sure why or if this will be an issue? Mike