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POWER SUPPLY (MDS-PS) ASSEMBLY
Start
by
assembling the power PC board following steps PI-P5.
If
~'
the board is being converted from use with an unregulated power
source then the two capacitors Cl and C2 should be removed.
Then
continue with the following steps.
51.
Install and solder the two electrolytic capacitors in the
locations indicated by the silk screen legend.
Be sure to
mount both capacitors with the
"+"
side oriented as
indicated
by
the silk screen legend.
C3
C4
35BBuf
3000uf
15wvdc
30wvdc
electrolytic
electrolytic
52.
Install and solder the four rectifier diodes.
Be sure to
observe the correct polarity when installing the diodes.
The banded end of the diode should correspond to the band
marked on the silk screen legend.
D1
D2
MR501
MR501
3 Amp
3 Amp
D3
D4
1N4002
1N4002
1
Amp
1
Amp
S3.
Mount the transformer to the cabinet using the 6-32xl/2"
machine screws such that the following sequence results from
bottom to top:
machine screw head, cabinet, transformer,
lock washer, and nut.
The transformer should be mounted so
that the solder lugs are away from the back of the cabinet.
S4.
Mount the toggle switch in the leftmost hole (looking from
the back) and the fuse holder in the center hole.
85.
Pass the power cord through the rightmost hole and solder
one wire to lug 1 of the transformer.
Cut the other wire
shorter and solder it to the lug at the end of the fuse
holder.
Clamp the power cord to the cabinet using the
strain relief bushing.
86.
Solder the other lug of the fuse holder to one of the lugs
of the toggle switch with a short piece of hook-Up wire and
then solper the other lug of the toggle switch to lug 2 of
the transformer.
57.
Put the fuse in the fuse holder.
58.
Solder the three transformer lugs 3, 4, and 5 to the three
corresponding holes in the power PC board marked T3, T4, and
TS on the silk screen legend using short pieces of hOOk-UP
wire (about 4 or 5 inches).
•
Now follow steps P9 and PIa of the Power Board assembly
instructions and the power supply is ready to use.
21
North Star MICRO-DISK System
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