12 9720 VCO
010321
( ) Using the nuts supplied with them, mount the eighteen
1/8" Closed Circuit Phone Jacks as shown in fig 2.
Note that while both Mono and Closed Circuit Jacks are
shown in the schematic (Fig 7), CC jacks are used for
both types. Orient the jacks as shown in fig 3 before fully
tightening the nuts to secure them.
It will be easier to do the ground wiring of J11-J18 before the rest
of the panel controls are mounted.
( ) Cut a 4-1/4" length of the bare wire supplied and pass it through
the holes in the "S" lugs of J11 and J17 (lift these two lugs away
from the panel and twist them so the wire can pass through).
Lift the "S" lug of J18 and connect the end of the wire extending
beyond J17 to J-18 lug S.
At this point there should be a stub of wire about 3/4" long extending
beyond the "S" lug of J11 which will be connected in later steps.
( ) Solder the connections between the wire and J11 and J17
before connecting the "S" lugs of J12-J16 to the wire by bending
them up until they touch the wire then soldering the two
together. DO NOT SOLDER the connection at J18.
( ) Using the flat washers and nuts supplied, mount
the seven potentiometers to the panel as shown
in fig 2. Note that four different values are used so be
careful that the correct value is placed in the correct
location. Value is stamped or printed on the body
of the part. Orient the pots with the solder lugs as
shown in fig 3 and fully tighten the nuts to secure them.
A tip:
marking the part number (e.g. R200) on the back
of the pots with an indelible pen will make later wiring
easier and less prone to error.
( ) Using the nuts supplied with them, mount the two
miniature toggle switches as shown in fig 2.
Orient the switches as shown in fig 3 and fully
tighten the nut to secure it. The switch is
symmetrical so whichever soldering lug
is on the left or up is #1.
Bend or remove this tab so
against the front panel.
that the pot will seat flush
SPDT switches may
be supplied even
though only SPST
are required.
S
X
T
T
S
X
Closed Circuit Jacks
have 3 lugs
2
2
3
1
1
3
Summary of Contents for 9720
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