[Info-vax] VAX 4000 105 power supply

[Joseph Floyd]

The correct pinout for a KA53 (VAX 4000 model 105 mainboard) is: (Need to use a fixed-width font to view)

Connector as viewed on the Mainboard.
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|  1  |  2  |  3  |  4   |  5   |   6  |   7  |
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|  8  |  9  | 10  |  11  |  12  |  13  |  14  |
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                  |======|
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Table 2–3 System Module Power Connector Voltages

Pin Number         Voltage                    Tolerance               Color
1                  – 12.1 Vdc                 5%                      Blue
2                  Ground                     -                       Black
3                  Ground                     -                       Black
4                  Ground                     -                       Black
5                  +5.1 Vdc                   5%                      Red
6                  +5.1 Vdc                   5%                      Red
7                  +3.5 to +5.25 Vdc          -                       Brown
8                  +5.1 Vdc                   5%                      Red
9                  +12.1 Vdc                  5%                      Orange
10                 +5.1 Vdc                   5%                      Red
11                 Ground                     -                       Black
12                 Ground                     -                       Black
13                 – 9 Vdc                    5%                      Yellow
14                 – 9 Vdc return             -                       White

-9V Measurement made with positive lead connected to pin13 and negative lead connected to pin 14.
Pin 14 is the Ground for the –9 Vdc supply (an isolated supply)

This was found in the manual: "VAXstation 3100 Model 76 Maintenance Guide" on page number 17 of the document (26th sheet of the PDF) in Table 2-3.

https://manx-docs.org/collections/antonio/dec/MDS-2000-01/cd1/VAX/VS31MMG2.PDF

I'm currently powering the KA53 mainboard from a Vaxstation 3100 38 power supply model H7821-00.    So, at least this supply is compatible with the H719-01 used in the VAX 4000 Model 100/105/106/107