If you do not have a multi
borrow one, you can still easily perform a
continuity check by using a battery and light
bulb. Select a wire and then check each pin
until the circuit is complete. Using this
method, the photo shows that it is the Red wire
that corresponds with Pin #3 on the connector.
15. The next step is to cut off the old cord
and clean up the holes in the PCC so you can
solder on the new cord.
16. This joystick was originally wired using
only a single side of each Pot. If you refer to
the schematic you can see that the Compustar
joystick needs to be wired on both sides of each
Pot. In the photo you can see were I pulled out
both Pots from their holders. The red circles
indicate were I soldered new wires onto the tabs
of the sides that were not used.
The Circuit
17. If you study the schematic you can see that
it is actually fairly simple. There are two
Pots, one for RA control and one for DEC control.
Each Pot is connected to same ground on one side
and voltage on the other side. On each Pot there
is another wire connected to the part that slides
across the resistor. This wire will also have a
voltage reading, but the voltage will vary
depending on where it is along the resistor.
These wires that have variable voltage are
connected to Pin #1 for RA control and Pin #3 for
DEC control.
18. When you push the "ABORT" button on the
Compustar computer it will carry out the abort
command as normal. It will also look at Pin #1
and #3 to see if there is voltage present. If
there is that means that a joystick is connected.
As soon as those voltages start to change up or
down that means that you are moving the joystick
and the computer will tell the telescope to move
depending on the voltage changes.
19. There are also two pushbuttons in the
joystick circuit. Both pushbuttons are connected
to ground on one side. PB1 is the pushbutton
that acts like the "SYNC" command key on the
computer and is also connected to Pin #2. PB2 is
the slew pushbutton and is also connected to Pin
#4. When PB1 is pressed it is basically touching
Pin #2 to ground. This is the computers signal
to carry out the "SYNC" command. Likewise when
PB2 is pushed it touches Pin #4 to ground and
this signals the computer to toggle between the
"SET" and "SLEW" speed rates.
Re-wiring the Joystick
20. In the schematic, if you follow the conductor from Pin #9, you will see that it is
connected to Pin #7 and #6, one side of PB2, one side of P2, one side of PB1 and one side of
P1. In the photo above you can see the original joystick wiring to the PCC. The four wires
at the top go to the Pots and the Blue and White sets of wires go to the fire buttons in the
handle. The arrows indicate that the circuits on the PCC show one side of each button is
(15 pages)
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