HP 5061-3476: Which boards go where

Chris Zach cz at alembic.crystel.com
Fri Sep 10 22:41:58 CDT 2021

Hi Guy!

Thanks for the post and interesting. No it's not quite the exact power 
supply but close. However....

Are you *sure* those cards are in the right slots?

Reason I am asking: When I look at the HP docs they label the 
Pre-regulator board as A3A1. A3A1 also has the red LED. The inverter 
board (the one with the transistors and transformers) is A3A2. Likewise 
the battery charge boards are A3A3, A3A4, and the control board at the 
end is A3A5.

The slots are labeled 1-5 with 1 being closest to the power cord and 5 
being on the output end. A3A5 will only fit in slot 5, and A3A4 has the 
12 volt trim pot that is accessible outside the supply by a cut-out so 
it has to be in slot 4. Slot 3 is not used on my unit because I don't 
have the battery backup circuits.

However in your picture slot 2 has the LED preregulator board and slot 1 
has the one with the transistors and transformers (inverter). So either 
your picture has the parts backwards or someone at HP should go to hell 
for exceptionally bad numbering.

Does your supply work?


On 9/10/2021 12:43 PM, Guy Dunphy wrote:
> Here are some disassembly pics of a HP 5061-6615 power supply.
>    http://everist.org/pics/hp1000_ps/5061-6615.zip 	2.9M	
> Details:
> HP 1000 Model 2113E  SN 2340A03701  OPT 004  014
> power supply  Model 5061-6615    SN 2340
> Not the exact same PS as yours, but it might help?
> My problem is I haven't been able to find a manual and schematics for that
> apparently late model supply. Though last time I looked was years ago.
> The lack of a manual/schematics froze that restoration project.
> Can anyone suggest where I might find a copy?
> PDF, or I'd pay for an original paper copy. (To use, and also ensure it's
> scanned in high quality.)
> Guy
> At 09:30 PM 9/09/2021 -0400, you wrote:
>> Quick question: I've been cleaning out and repairing an HP5061 supply
>> for a 1000 computer. However I didn't take a picture of the 4 boards
>> when I pulled them and I want to make sure they go in the right places.
>>  From the manual (page 99 of 92851-90001_Sections-IXB_Mar-1981.pdf) the
>> slots are labeled A6-J1 through A6-J5. Does this mean that:
>> J1 is the
>> J5 is the control board (A3A5)
>> J4 is a jumper board for +12 adjustments
>> J3 is unused (battery backup boards)
>> J2 is the inverter board (A3A2)
>> J1 is the pre-regulator board (A3A1)
>> Seems right but I know how bad things can go :-)
>> Thanks!
>> C

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