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4. Mount the 690-3-B heat sink and LM317K regulator on the PC
board such that the following sequence results from back to
front: 6-32 bolt heads, PC board, heat sink, regulator, lock
washers, and nuts.
Two bolts are required to mount this
regulator.
position the heat sink as far from the edges of
the PC board as possible and tighten the bolts.
Now solder
the two regulator leads.
5. Assemble the disk drive power plug as follows.
Cut off a
piece of 4-conductor power cable about 3 inches long.
Remove
an inch of outer insulation from both ends.
Strip 1/4" of
insulation from each conductor at both ends.
Crimp and solder
each of the four power plug pins to the conductors at one end.
Finally, insert the power plug pins into the power plug using
the following color code: +5 read, +12 green, ground black and
white.
Consult the OEM Manual (sections 4.2 and 5.2) for the
correct connection of power to the power pins.
6. Solder the four wires coming from the power plug assembly to
the appropriately labeled holes in the lower righthand corner
of the PC board.
The wires should be inserted into the PC
board from the solder side.
NOTE: If the MOS-PS power supply is being used, then skip the
remaining steps of these instructions and go on to the MDS-PS
assembly instructions.
7. Insert and solder the two .047uf ceramic disc capacitors (Cl
and C2) in the locations indicated by the silk screen legend.
8. The four wires in the 5-foot power cable should.be soldered to
the four holes in the PC board labeled 0v, 0v, 9v, and 18v
using the following color code: 0v black, 0v white, 9v read,
18v green.
The wires should be inserted into the PC board
from the component side.
9. Connect the other end of the power cable to the appropriate
power points of the unregulated power supply.
For example,
the cable can be connected to the power pins at an unused
position on the S-100 bus mother board.
Consult the computer
reference manual for details.
If the disk drive is to be
mounted inside a cabinet (MOS-CAB)
then the power cable should
be passed through a hole in the back of the cabinet and
clamped with the provided strain relief bushing before
connection to the power source.
10. Check that the regulators are providing +5 and +12 volts at
the power plug before plugging into the drive.
21
North Star MICRO-DISK System
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