Harris Performance 7000 - Manual (Page 62)

Chapter 8: 7000PS Power Supply Module Output Voltage Selection
36 6800/7000 Series - Frames and Power Supplies Installation and Operation Manual
Output Voltage Selection
Ouput voltage is controlled by selection of jumpers J1-J4 for positive
voltage, and jumpers J5-J8 for negative output.
Installing jumpers J2 and J4 connects the nominal 7 V ending to the
output rectifier filter circuitry. This allows the power supply to be
adjusted to 6 or 8 V output.
Installing jumpers J1 and J3 connects the 13 volt winding to the output
circuitry and gives a 13 V output.
Installing jumpers J1 and J4 connects the 7 V winding in series with the
13 V winding to the output rectifier and filter circuitry. Two windings in
series gives an output which can be adjusted to 21V.
Installation of jumper J5-J8 give the corresponding negative output
voltages.