Advertisement
4,
fasten the ''8" board in place using two each 440 X 1/4 inch machine screws and 6 1cotwashers.
Note that diode D5 as well as the wires to S3 and J2 will be between the front panel and the
front edge of the "a" circuit board.
Make sure that all seven of the LED's associated with this
circuit board align with the front panel holes provided for them.
Following the same procedure that was used while mounting the "A" circuit board,
Using the wires previously connected to pin jacks J4 throngh J9 make the following connections
to the ''8" circuit board.
Solder each connection as it is made. (see figure 14)
(V#
The shorter of the two leads from J4 to 'B" circuitboardpoint "AH".
The longer of the two leads from J4 to point ''88''.
The lead from J5 to point ''AA''.
The lead from J6 to point ''CC''.
The lead from J7 to point "DD''.
The lead from J8 to point ''FF''.
(J#
The lead from J9 to point "EE".
MAKE THE FOLLOWING CONNECTIONS BETWEEN THE ''A" and ''8'' CIRCUIT BOARlrs.
Solder each connection as it is made. (see figul.e 15)
(7
::i::::X:"..::::
(+f
point "u" (center
conductor Of co-ax)
Point ''V" (shield of
cO-ax)...........
to ''8'' board
point ''X''.
point 'rY„
point ''Z„
point ''AB„
point ',U„
point ,rv„
Connect the short piece of insulated wire previously soldered to the ''com" terminal
of the upper LED board (4780/C) to point ''AD" of the ''B" circuit board.
IVIAKE THE FOLLOWING CONNECTIONS TO THE FRONT PANEL CONTROLS USING THE
WIRES PREVIOUSLY INSTALLED ON THE 4780/8 CIRCUIT BOARD. (See figure 14)
(ty'
from point "AG" to lug #1 of pushbutton s2 (solder two wires).
(ip`,
from point "AU" to pin jack J18 (solder).
EREJ
from point ''AF" to lug #1 of R136 (solder two wires).
from point "X" to pin jack J16 (solder two wires).
from point ''AX" to lug #1 of R137 (solder two wires).
from point ''AW" to lug #3 of R137 (solder two wires).
Feed the wire originating at ''8" circuit board point ''ZZ" between the front panel
and the wires connecting to pin jacks J4 through J9 and connect to lug #1 of S1 (solder).
FLIP THE MODULE OVER AND MAKE THE FOLLOWING CONNECTIONS USING THE
WIRES PREVIOUSLY PASSED THROUGH THE CIRCUIT BOARD. (see figure 16)
(`}py`
Connect the wire originating at circuit board point "WW" to pin jack J17 (solder).
(t-`
Connect the wire originating at circuit board point "AE" to the "com" pad of the
4780/C board.
NOTE: Do not pass this wire through the hole in the "com" pad as this
presents the danger of a short circuit to the front panel.
Simply lay the wire against the
pad and solder in place.
Connect the wire from circuit board point ''UU" to J15 (solder).
Connect the wire from circuit board point 'TT" to J14 (solder).
(`#`a
Connect the wire from circuit board poiut "SS" to J13 (solder).
(`f
Cormect the wire from circuit board point "RR" to J12 (solder)
Connect the wire from circuit board point ''PP" to Jll (solder)
Connect the wire from circuit board'point ''NN" to J10 (solder)
N#
Connect tbe wire from circuit board point "VV" to J3 (solder).
NOTE: Exercise
caution at this connection that the two wires coming through the single hole in the circuit
-
board are not confused.
Connect the wire coming from circuit board poiflt ''YY" to lug #1 of S3 (solder 2 wires).
THIS COMPLETES ELECTRICAL ASSEhill3LY OF THE 4780 SEQUENCER.
Turn the module over
and install the 12 pitch control knobs on the shafts of the multi-turn trimmers accessible through
the holes in the front panel.
Rotate the three potentiometer shafts (R135, R136 and R137) fully
counter-clockwise before pressing on the three control knobs provided.
Make sure that the
pointer of each knob points to the ''7 0'clock" position of an imaginary clock face before pressing
it in place.
13
Advertisement
