Table of Contents
Advertisement
RAM BOARD ASSEMBLY
Before beginning assembly of the RAM board, first check that you
have all the parts listed in the parts list.
This manual aoolies
to the RAM-16-A3 board revision - check the PC board markinq to
be sure you do not have a RAM-16-A2 board.
Note that in the
following instructions, "left" and "r ight" refer to those
directions when viewing the component side of the PC board with
the 100-oin connector facing down.
~.
Using an ohmmeter, check for open circuits between the pair
of solder pads for each of the following six capacitor
locations: Cl, C2, C3, C4, C5, and C6.
If any shorts are
found, locate and correct the problem or return the PC board
for reolacement.
J.
j
~-
Insert and solder the two 20-pin IC sockets at locations 8D
and 17E on the PC board.
Follow the procedure described in
the Assembly Information section.
Be sure the sockets are
installed with the correct orientation (all the IC's have
pin 1 toward the top of the boaid.
Insert and solder the thirty-nine 16-pin sockets with
correct orientation.
Do not install a socket at the switch
position (7A).
Do not install any sockets in the positions
reserved for the parity option unless you will be assembling
the parity option at this time.
The parity option sockets
are located
a~
positions 3A, 9A, 9B, 9C, and 9D.
Insert and solder the twenty-one 14-pih sockets with correct
orientation.
Do not install sockets at locations 10E or
15E, unless you are assembling the parity option at this
time.
Now check all the solder joints for possible solder bridges
between adjacent solder pads, unsoldered connections, or
cold solder joints.
Insert and solder the following resistors:
Resistor
Value
Size
Location
Color-code
(t
Rl
2.2K
1/4W
0A
red-red-red
(-../
R3
330
1/4W
2D
org-org-brn
(' *
R4
2.2K
1/4W
7A
red~red-red
(:f'R5
18K
1/4W
lA
brn-qry-org
(
R6
470
1/4W
IB
yel-vio-brn
(~
R7
10K
1/4W
2A
brn-blk-org
(
R8
2.2K
1/4W
7A
red-red-red
(,;( R9
2.2K
1/4W
3D
red-red-red
( ) R10
330
1/4W
10E
org-org-brn
('-)
Rll
2.2K
1/4W
6A
red-red-red
(V')
R13
2.2K
1/4W
5C
red-red-red
North Star 16K RAM Board
Hl
Advertisement
Table of Contents
