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RAM 4A-4 Assembly Instructions
1)
Unpack your board and check all parts against the parts lists
enclosed in the package.
2)
If gold contacts on the edge connector appear to be corroded, use
pencil eraser to remove any oxidation.
bright or any abrasive material as it will remove the gold plating.
3)
Insert and solder each of the eighteen IK ohm 1/4 watt resistors
(brown/black/red)
location.
4)
Insert and solder each of the ten 220 ohm 1/4 watt resistors (red/
red/brown) R19 through R28 .
5)
Insert and solder the one 100 ohm 1/4 watt resistor (brown/black/
brown)
R29.
)
Insert and solder each of six 1N4002 diodes, CR1 through CR
as shown in the Assembly Diagram.
as indicated on board.
7)
Insert and solder one 1N751A zener diode,
marks as shown on the board.
NOTE:
All IC pin I's point in the direction of the edge connector as
indicated with the square solder pad in each hole pattern."
)
Insert and solder each of the three 74LS74 at locations CIO, C9, a
8
and D2.
9)
Insert and solder each of the three 74LS156 at locations D
and DIO.
10)
Insert and solder each of the three 8T97 at locations C2, C3, and
D 3 .
11)
Insert and solder one 8T98 at location D l .
' '7)
Insert and solder one 7402 at location C
Insert and solder one
13)
v4)
Insert and solder one
Insert and solder two
RAM 4A
Assembly Instructions
RESISTOR INSTALLATION
R1 through R18 .
See Assembly Diagram for location.
See Assembly Diagram for location.
IC INSTALLATION
in location
7 4 L S 2 0
at location
7 4 2 5
at location
7 4 0 4
NOTE:
Do not use Scotch-
See Assembly Diagram for
NOTE:
Observe polarity marks
Z1 observing polarity
.
8
C4.
C 7 ,
C6 and
D 7 .
,
6
, D9,
8
6 - 1 3
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