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(~J
lU4
2.2K
1/4W
6C
ped-red-red
(~R15
2.2K
1/4W
IB
red-red-red
(vY.
R16
22
1/4W -
8B
red-red-blk
(A.(
R17
22
1/4W
8B
red-red-blk
(~RI8
22
1/4W
8B
red-red-blk
( ·,RI9
22
1/4W
8B
red-red-blk
(./)/ R20
22
1/4W
8B
red-red-blk
(.-1"
R21
22
1/4W
8B
red-red-blk
( . . . . f
R22
22
1/4W
8B
red-red-blk
(V)
R23
22
1/4W
8B
red-red-blk
.//
~v(
R24
330
1/4W
12E
org-org-brn
'\JIl~~.
\ 13-8.
V
'-
Insert and solder the single-in-line (SIP) resistor network
labeled RNI on the layout legend at location 16E.
Orient
the SIP so the end marked with a "1"
(sometimes this end has
a beveled corner) corresponds to the end marked with a dot
on the layout legend.
Save the resistor R12 (220
special DMA applications.
section for details.
Note
R2, is only installed with
ohm, red-red-brn) for future
See the Special DMA Applications
that the other omitted resistor,
the parity option.
Insert and solder the 8-position DIP switch at location 7A.
Or ient the switch so that ..
ow'
is to the right.
The DIP
switch solders directly to the board without a socket.
Install and solder the 5 volt 7805 regulator and 6106-14
heat sink (the larger of the two heat sinks) at location 04.
Neatly bend the regulator leads so they will route over the
edge of the heat sink and down through the holes in the PC
board without touching the heat sink or each other.
Insert
the regulator leads into the PC board holes and then attach
the regulator and heat sink to the board with a 6"':32x3/8"
machine screw so that the following order results from
bottom to top:
machine screw head, PC board, heat sink,
regulator, lock washer and nut.
Before tightening the
machine screw, position the heat sink regulator assembly as
far as possible from the edge of the PC board.
Finally,
/~older
the regulator leads.
/ /
~.
Install and solder the 12 volt 7812 regulator and 6107-14
heat sink at location 03.
Follow the procedure of the
previous step.
~l.
Insert and solder the 79L05 regulator at 10cationQl,
orienting the regulator so that the flat edge corresponds to
/the flat edge indicated on the layout legend .
• ,...i'
.,.{>f'/
~12.
Insert and solder the following tantalum capacitors, being
careful to insert the + lead of each capacitor into the hole
marked
"+"
on the layout legend.
The
+ -
lead is sometimes
indicated by a red dot on the capacitor.
Refer to the
11
North Star 16K RAM BOARD
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