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Prepare for assembly by thoroughly cleaning the conductor side of the ''8" circuit
hstall the multi-turn potentiometers R41 through R46. Install the controls by pushing all three
pins through the holes provided in the clrcutt board and then soldering only the pin closest to the
edge of the circuit board.
Make sure that the control is perpendicular before soldering the rear
two pins of each control.
(#ty-
E::
(i£ ,
R43
(ay,'
R44
(`Y
R45
(i
R46
50K multi-turn
50K multi-turn
50K multi-turn
50K multi-turn
50K multi-turn
50K multi-turn
When these controls have been Soldered in place, carefully pull the knobs from the shafts. Save
the lmobs for re-lngtallatlon in later steps.
Mount the integrated circuit.
Note that the orientation of the integrated circuit is keyed by a notoh
at one end of the case which aligns with the semi-circular key on the de8ignator printed on the circuit
board. Use particular care when installing this part, like any other semi-conductor it iB heat sensi-
tive and should not be exposed to extraordinarily high soldering temperatures.
Make Sure that the
orientation is correct before soldering. once the unit is in place it cannot be removed without destroying
destroying it.
DESIGNATION
TYPE NO.
ut
IC-1
......................
LM3900 or
CA3401E Quad Norton Amplifier
h the following steps wires will be soldered to the clrcult board which will later connect to tbe
front panel controls and jaekB. At each step prepare the wire by cutting it to the Specified length
and stripping 1/4 inch of insulation from each end Of the wire.
''Tin" each end of the wire by
twisting the exposed strands tightly together and melting a small amount of solder into the wire.
Using the wire provided make the following connections to the ''A" circuit board.
A 10 inch length to point 'W''.
4-1/2 inch length to point ''H''.
5 inch length to point ''J''.
4-3/4 inch length to point ''K".
4-1/2 inch length to point ''L''.
6-1/2 inch length to point ''M''.
4 inch length to point ''N''.
6 inch length to point ''P''.
6-1/2 inch length to poitit ''R''.
6-3/4 inch length to point ''S''.
1-1/4 inch length to oof nt 'T''.
6 inch length to point ''AJ3''.
1-I/2 inch length to point ''A''.
1-1/2 inch length to point "8''.
1-1/2 inch length to point "C''.
1-1/2 inch length to point ''D"
1-1/2 ilich length to point ''E'1.
1-1/2 inch length to point ''F".
1-3/4 inch length to point ''G''.
Pass the wires from points A, 8, C, D, E and F through the unmarked holes adjacent to each point.
Tj-:
/
(+,.,
4
11 facilitate their connection to front panel jacks in later Steps. See ligure 2.
Prepare the 2-1/4 inch piece of RG-154/U co-axial cable provided by 8trlpping 1/2 inch
Of the black outer insulatioD from each end. Carefully un-brald the shielding to apose
the insulated inner conductor. Twist the loosened braid back together and lightly "tin"
the end.
Remove 1/4 inch Of insulation from the irmer conductor at each end (Bee figure 3)
At one end of the cable prepared above connect the tinned shield to circuit board point
'rv.l and solder.
Comect the inner conductor Of the cable prepared above to circuit board point 'U''.
TELS CoMPLETEs AssErmL¥ oF THE ..A.i clRculT BOARD. TEMpoRAluL¥ SET THE CIRCulT
BOARD AslDE AND pROcEED VITH THE AssErmLy OF THE 4780 I.Bw clRcurr BOARD.
board with a scouring cleanser.
Rinse with clear water and dry completely.
Following the directions given for resistor installation on the ''A" circuit board, install the fixed
value resistor.s on the ''8" circuit board as follows.
Save the resistor lead clippings for use in
later steps. See figure 4.
DESIGNATION
( i,,
R48
( ty,,`
lEi=
DE=|
(#
:i
er.
R49
R50
R51
R52
R53
R54
R55
R56
R57
R58
R59
R60
R61
R62
R63
R64
R65
R66
R67
R68
R69
R70
R71
R72
R73
R74
R75
R76
R77
R78
R79
R80
R81
R82
R83
R84
R85
R86
R87
R88
R89
R90
R91
R92
R93
R94
R95
R96
R97
R98
R99
R100
R101
R102
R103
R104
COLOR CODE A-B-C
brown-green-yellow
brown-green-yellow
brown-green-yellow
brown-green-yellow
brown-green-yellow
brown-green-yellow
brown-black-red
brown-black-red
brown-black-red
brown-black-red
brown-black-red
brown-black-red
blue-grey-brown
brown-black-orange
orange-orange-yellow
red-red-yellow
red-red-yellow
red-red-yellow
red-red-yellow
red-red-yellow
red-red-yellow
red-red-yellow
red-red-yellow
red-red-yellow
red-red-yellow
red-red-yellow
red-red-yellow
red-violet-yellow
red-violet-yellow
red-violet-yellow
red-violet-yellow
red-violet-yellow
red-violet-yellow
red-violet-yellow
red-violet-yellow
red-violet-yellow
red-violet-yellow
red-violet-yellow
recl-violet-yellow
orange-orange-yellow
orange-orange-yellow
orange-orange-yellow
orange-orange-yellow
orange-orange-yellow
orange-orange-yellow
orange-orange-yellow
orange-orange-yellow
orange-orange-yellow
orange-orange-yellow
orange-orange-yellow
orange-orange-yellow
red-red-yellow
red-red-yellow
red-red-yellow
red-red-yellow
red-red-yellow
red-red-yellow
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