NorthStar HORIZON Manual page 15

for all sockets being installed. Then remelt the corner
connections while applying pressure down on the board. This will
remove any gaps that may be present between the IC sockets and
the PC board. Finally, solder the remaining pins of the IC
sockets.
DIP HEADER SOLDERING
Wren making jumper connections on a DIP header, solder resistor
or capacitor lead snippings between the leads to be connected.
Wren more than two pins are to be connected together, bend a
single wire so that it routes to each pin, and solder each pin
or.ce. Insert the header in an IC socket on a PC board to hold it
dlring soldering. Overheating the pins with the soldering iron
will melt the plastic of the header. If there are multiple
jlmpers on a header, make sure that no unintended connections are
made by carefully routing the jumpers, or by insulating each
jllmper with some wire insulation.
RE:SISTOR AND CAPACITOR INSTALLATION
Te, install resistors or capacitors, first make right angle bends
iI' the leads to fit the PC board hole spacing. (Some capacitor
lE,ads are already appropriately spaced and do not need bending.)
Tl,en insert the leads as far as possible through the correct
hc,les in the PC board and spread the leads slightly on the solder
so_de of the board to keep the part in place. After a group of
resistors or capacitors has been inserted, then solder the leads
OIl
the solder side of the board and snip off the excess leads as
c_ose to the board as possible. Use caution to avoid eye injury
flam flying bits of wire. Save the lead clippings for later use
ill making jumper connections.
PI{INTED CIRCUIT BOARD LAYOUT
T'1e white component layout legend is printed on the component
side of a printed circuit (PC) board. All components are
i1sprled from this side (component side) and soldered on the
a ther side (solder side). Locations on the PC board are
identified by two--character codes as marked on the board: a digit
f'lilowed by a letter indicating the horizontal and vertical
cJordinates of the location. Note that in North Star kits, IC's
C3n be found on styrene pads in positions corresponding to their
intended locations on the PC board.
Pin numbering conventions for the S-100 edge pins are as follows:
When Viewing the component side of the board (with the pin edge
facing down), pins 1,2, ..• , 50 range from left to right. When
viewing the solder side of the board, pins 100, 99, ... , 51 range
from left to right.
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North Star HORIZON Computer