Page 12
Interface Board Assembly Steps
Insert and solder parts working from shortest to tallest:
1) Insert and solder R1-R6 and D1 (or wire jumper – see * above)
2) Insert and solder VR1. Bend the leads such that the hole in the mounting tab lines up with hole in
the circuit board. You may want to temporarily slide the heat sink under the regulator before sol-
dering to make sure the part is the right height off the surface of the board.
3) Insert and solder IC-A through IC-N (or sockets).
4) Insert and solder C1-C17. Note polarity on C1.
5) Insert and solder J1
6) Insert and solder J2
7) Insert and solder T1-T3
Install the heat sink under VR1 and fully tighten with the #4 hardware listed in the parts list. Do not use
a mica insulator. Thermal grease is not required.
J1 Cable Assembly
A 50 pin ribbon cable connects the front panel board to the interface board in the bus. One way to route
this cable is shown in the picture below. Here the cable exits towards the back side of the board, takes a
45/90⁰ bend, and then runs along the side of the cards to reach the front panel connector. The cable
could also come forward over the CPU board, then take a 45/90⁰ bend to go left, and then straight into
the front panel connector. This latter routing could be employed if a card cage is used that prevents
running the ribbon cable out the side. The parts for this cable are listed under J1 in the parts list.
J2 Cable Assembly
A straight-through, eight wire cable assembly connects J2 on the interface board to the data connector
on the CPU board. In the picture below, this assembly consists of red and black wires with a white con-
nector at each end. The parts for this assembly are listed under J2 in the parts list.
