The L1000 tape library has two types of power supplies (ATL P/N's: 
6220518-01 and 6220571-01). There is only one SUN part number (370-3531) 
which has two revisions (-01 and -02), but you CANNOT specify the 
revision when ordering (revisons correspond to the 2 different ATL
power supplies).
The cables and connectors on these power supplies are slightly 
different from each other (output voltages and number of cables), but 
either supply will function properly in the L1000 Library Unit.

Both power supplies are interchangeable with ONE caveat. 
The transformer wires are color coded differently as follows:

6220518-01        6220571-02
brown             brown         upper terminal away from power supply
white             brown/white   lower terminal away from power supply
black             blue          upper terminal close to power supply
blue              blue/white    lower terminal close to power supply
green             green         chassis ground
                         ______
                        |\     \
6220518-01  6220571-02  | \     \
brown       brown-------+U \     \
white       brn/wht-----+L  \     \
                        \    \     \
black       blue---------+--U \_____\
blue        blu/wht-------+-L |     |
                     |     \  |XFMR |
green---+---green    |      \ |     |
      __|__         \|/      \|_____|
       ---           `
        -     to power supply

    -------------------------------------------------------

The cables and connectors between power supplies are slightly 
different, but the required ones are present on both.

Connections:

J5 on power supply                            to J5 on the backplane
J6 on power supply                            to J6 on the backplane
J7 on power supply                            to J7 on the backplane
3 peripheral connectors on power supply       to Drives 0,2 and 3
drive 1 (longer cable than 0,2 or 3)          to J8 on the backplane
5 transformer wires                           to transformer (see above)
all other power supply connectors             not used
            
    
  ^   ^   ^         .----.     .-------------------------.
see transformer +--=|    |=    |                         |   
wiring above -> +--=|XFMR|=    |                         |  
                |   '----'     |      Backplane          |
              .-+-------.      |                         |
              |   PS  J5|------> J5                      |
    Drive 0---|         |      | J29 N/U                 |
    Drive 2---|  J29/J4 |      | J4 N/U                  |
    Drive 3---|  N/U  J6|------> J6                      |
    Drive 1-+ |         |      | J8 J7                   |
            | |       J7|--+   '-^--^--------------------'
            | '---------'  |_____|__|           
            |____________________|             
               (longer cable)