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"Flying" Wires
(i.e. those which go from circuit board to panel mounted parts.)
In the following steps, wires will be soldered to the 9720 board
which in later steps will be connected to the front panel controls
and switches. At each step, cut a piece of wire to the specified
length and strip 1/4" of insulation from each end. Twist the
exposed wire strands together and "tin" them by melting a small
amount of solder into the strands. This will make soldering easier
when the wires are installed and prevents fraying
of the wire strands when they are pushed through
the holes. Solder each connection as it is made
and clip any excess wire from the solder side
of the board.
PC POINT
WIRE LENGTH
( ) "A"
7-1/4"
( ) "C"
7-1/2"
( ) "E"
7"
( ) "H"
6-1/4"
( ) "J"
6"
( ) "L"
7-1/4
( ) "N"
7-1/4"
( ) "P"
8"
( ) "S"
8"
( ) "U"
6-1/4"
( ) "W"
7"
( ) "Y"
5-3/4"
( ) "AA"
6"
( ) "AC"
5"
( ) "AE"
7-1/2"
This completes assembly of the 9720 circuit board. Admire your work for a few minutes
then take a break. When you come back, admire your work again but this time be critical. It
would be a good time to double check the orientation of polarized parts and that the right
resistors and capacitors are in the right places. Examine the solder joints. On the component
side make sure excess solder has not flowed though the hole. On the solder side, are they all
nice and shiny? If they have the "lumpy" granular look that indicates a cold joint, reheat them.
Solder bridges are less likely with a solder masked circuit board but they can still happen. If
you're not sure about a bridge refer to the foil patterns in fig 1.
Front Panel Controls
Now we will put the circuit board aside temporarily and mount the
controls, switches and jacks on the front panel. If you have the optional
panel available from PAiA, you will be installing these parts at the
locations shown in fig 2.
010321
PC POINT
WIRE LENGTH
( ) "B"
7-3/4"
( ) "D"
7-1/2"
( ) "F"
7"
( ) "I"
6"
( ) "K"
7-3/4"
( ) "M"
7-1/4"
( ) "O"
8"
( ) "R"
7"
( ) "T"
6-1/2"
( ) "V"
6-1/4"
( ) "X"
6"
( ) "Z"
5-3/4"
( ) "AB"
6-3/4"
( ) "AD"
7-3/4"
( ) "AF"
8"
Note:
Note:
Note:
Note: If you also have the
Note:
9720frm FracRak
Accessory kit do not use
the wire from that kit in
these steps. 9720frm
wires are already cut to
length for use with the
power connector.
Be very careful not to nick wire
strands while stripping
insulation. An inexpensive wire
stripper is a good tool to have
here. When soldering the wire
to the board do not allow the
insulation to slip through the
hole - make sure you are
soldering to wire.
9720 VCO
11
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