To Replace The Top Pc Logic Power Supply; To Remove The Bottom Pc Logic Power Supply; To Replace The Bottom Pc Logic Power Supply; To Make Adjustments Required After Replacement - Sun Microsystems Enterprise Tape Library 7/3500 Field Service Manual

To Replace the Top PC Logic Power Supply

Follow the removal instructions in reverse order.

To Remove the Bottom PC Logic Power Supply

1. Detach the connectors from the tape drive MUX PWA.
2. Disconnect the AC power.

To Replace the Bottom PC Logic Power Supply

Follow the removal instructions in reverse order.

To Make Adjustments Required After Replacement

1. Turn off AC power and remove the PC power supply cover (remove the screws on
the top of the power supply).
2. Verify that +5V, +12V, and -12V fuses are replaced and that no shorts exist.
3. Hook a DVM up to +5V and GND test points on the robotics controller.
4. Turn on AC power.
5. Locate potentiometer in PC power supply main board.
6. Adjust +5V to between +5.05V and +5.15VDC.
7. Verify that +12V is between +11.5V and +12.5V. If not, adjust +12V within limits
and reverify that the +5V is within limits.
8. If power cannot be adjusted, replace power supply and repeat procedure.

To Troubleshoot

Make sure the connectors on the robotics controller PWA are seated properly.
152 Sun Enterprise Tape Library 7/3500 Field Service Manual • July 1997