Epson EQUITY 386/33 PLUS - Manual (Page 53)

2. Hold up the front of the subassembly at a slight angle and
arrange the ribbon cables so they curve underneath the
subassembly and extend out its left side. Then grasp the
two power supply cables, labelled P4 and P5. Each
connector has six pin holes and a large tab on one side, as
shown below.
There is a 12-pin power supply socket on the right side of the
main system board (toward the back) that holds both of the
power supply connectors, as shown below.
power supply
Accessing Internal Components 3-11