Paia 4780 User manual

ELECTRONICS, INC.

=EOUENCER

ASSEMBLY

INSTRuCTloNS

47=EJ

In basic terms, a sequencer is simply another control voltage and trigger source. UDlike

other controllers, howevel.; it allows the user to pre-program an extended sequence of

control voltage variations that can be called up on command and allows the variations to

be executed at speeds beyond human capabilities. In addition to their obvious applications

in generating fast arpeggios and automatic bass lines, sequencers can also be used as

programmable function generators, counters or clock sources.

Considerable time and effort has gone into making the PAIA 4780 as versatile as possible

without losing the user in a hopeless tangle of operational details. Many of the internal

"housekeeping" functions are automatic yet externally available inputs and controls permit

by-passing automatic functions in favor of manual control.

SPECIFICATIONS

Power requlrenientB: + 18 v. @ 50 rna.

± 9v. @ 1 rna.

Clock rate: 2/see. to 32/see.

Control voltage range: 0 -5 v. nominal

Addltlonal features: Built in glide

Light Emitting Dlode lndlcates clock rate

LED Stage Status indicators

Manual and eleetrlcly activated controls

2 to 12 event re-circulating count capabilities.

SOIjDEluNG

Use care when mounting all components. Use only rosin core solder (acid core solder is never used

in electronics work. ) A proper solder joint has just enough solder to cover the I.ound soldering pad

and about 1/16 inch of the lead passing through it. There are two improper comections to beware of:

Using too little solder will sometimes result in a connection which appears to be soldered but actually

there is a layer of flux insulating the component lead from the solder bead. This situation can be

cured by re-heating the joint and applying more solder. If too much solder is used there is the danger

that a conducting bridge of excess solder will flow between adjacent circuit board conductors forming

a short circuit. Unintentional solder bridges can be cleaned off by holding the board up-side down and

flowing the excess solder off onto a clean hot soldering iron.

Select a soldering iron with a small tip and a power rating not more than 35 watts. Soldering guns are

completely unacceptable for assembling transistorized equipment because the large magnetic field they

generate can damage solid state components.

CIRCUIT BOARD ASSEMBLY

( ) Prepare for assembly by thoroughly cleaning the conductor side of the smaller "A" ciroult

board with a scouring cleanser. Rinse the board with clear water and dry completely.

Solder each of the fixed resistors in place following the parts placement designators printed on the

circuit board and the assembly drawing figure 1. Note that the fixed value resistors are Don-polarized

and may be mounted with either of their two leads in either Of the holes provided. Cinch the resistors

in place prior to soldering by putting their leads through the holes and pushing them fil.mly against the

board; on the conductor side of the board bend the leads outward to about a 45° angle. Clip off each

lead flush with the solder joint as the joint is made. Save the lead clippings for use as jumpers in

later steps.

A P i silverorgold-disregardthisband

DESIGNATION

COLOR CODE A-B-C

brown-green-yellow

brown-black-red

blue-grey-yellow

orange-orange-yellow

red-red-yellow

orange-white-green

brown-black-green

red-red-green

brown-black-green

yellow-violet-I`ed

brown-green-orange

orange-orange-orange

brown-green-yellow

blue-grey-brown

brown-black-green

brown-black-orange

brown-black-brown

orange-orange-yellow

brown-green-orange

brown-black-red

brctwn-green-yellow

red-red-orange

yellow-violet-yellow

brown-black-green

orange-orange-orange

DESIGNATI0N

#ar: I;

VALUE

47K ..

1meg

1 meg ,

COLOR CODE A-B-C

yellow-violet-orange

brown-black-green

6. 8K ................... blue-grey-red

10K...................brown-black-orange

Install the ceramic disk capacitors. Without exception the value will be marked on the body Of the

part.

DE sroNATio N vA LUE

. 001 mfd. oeramlc disk.

100 pf. ceramic diskik

. 05 mfd. ceramic disk

. 05 mid. ceranic disk

Up to this point all components have been ron-polarized and either lead could be placed in either of

the holes provided without affecting the operation of the circuit. Electrolytic capacitors are polarized

and most be mounted so that the ''+ " lead of the capacitor goes through the ''+ " hole in the circuit

board. In the event that the ''-'' lead of the capacitor is marked rather than the " + " lead it is to go

throngh the unmarked hole in the circuit board.

Note that the operating voltage (v. ) specified for a capacitor is the minimum acceptable rating.

Capacitors supplied with specffic kits may have a higher voltage rating than that specified and may

be used despite this difference. For instance. a 100 mid. 25v. capacitor may be used in place of

a 100 mid. 10v. capacitor without affecting the operation Of the circuit.

Mount the following electrolytic capacitors and solder them in place. The values, voltage rating and

polarization are marked on the body Of the part.

uH,?AI"::

VALUE

2. 2 mid. 10v. electrolytic

2. 2 mfd. 10v. electrolytic

hstall the transistors. Orientation Of the transistors is keyed by the flat on the side of the case and

should be evident from inspection of the parts placement diagram shown in figure 1 and the parts

placement designators printed on the circuit board. All semi-conductors are heat sensitive and may

be damaged if allowed to get too hot during soldering. To be on the safe side heat sink each transistor

lead during the soldering operation by grasping it with a pair of needle-nosed pliers at a point between

the circuit board and the body of the transistor. The part type no. is printed on the case.

DESIGNATION TYPE NO.

#,y i:

2N5129

Install the diodes. Note that these parts are polarized and must be

properly oriented in order to

operate correctly. Polarization of the diodes is indicated by a colored band on one end of the case.

Install as shown in figure 1. The physical appearance Of the device is related to the schematic

symbol used on the circuit board parts placement designators in the drawing below.

DESIGNATION

(¥z :i

TYPE NO.

|N914

Using the excess resistor leads clipped from resistor installation. form and install the

wire jumper indicated by the solid line printed on the circuit board and shown in the parts

placenien( diagrar.I figure 1,

Install the trin`mJ=r potf,ntiometer.

:?i.- .`

NATION

R37

VALUE

50K trimmer potentiometer

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

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.

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-:

(+,.,

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

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DE=|

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-black-red

blue-grey-brown

brown-black-orange

orange-orange-yellow

red-red-yellow

red-violet-yellow

recl-violet-yellow

orange-orange-yellow

red-red-yellow

DESIGNATI0N

(+`

IEE,

:.f`

(i.`

ff3FL

R105

R106

R107

R108

RIO9

R110

R11|

R112

R113

R114

R115

R116

R117

R118

R119

R120

R121

R122

R123

(V' R130

(¥;

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(iF

:i`

(d¢,fry

R131

R132

R133

R134

R140

R141

R142

R143

100K...............

LOOK................

2. 2 meg ohm .,......

330K

IK..................

1K..................

47 ohms ..............

330K.....'..........

|00K................

33K.................

680 ............. ' . . .

10K.................

COLOR CODE A-B-C

red-red-yellow

brown-black-yellow

brown-balck-yellow

brown-black-yellow

red-red-green

orange-orange-yellow

brown-black-red

yellow-violet-black

orange-orange-yellow

brown-black-yellow

orange-orange-orange

blue-grey-brown

brown-black-orange

Install the ceramic disk capacitors. The values Of these capacitors are marked on the body of the

part.

:::.

HEE

(y,

01 mid. ceramic disk

005 mid. ceramic disk

01 mid. ceramic disk

01 mfd. ceramic disk

01 mid. ceramic disk

. 01 mfid.

. 01 mfd.

. 01 mid.

• 01 mfd.

ceramic disk

cerahic disk

ceramic disk

loo p£. ceramic disk

. 005 mid. ceramic disk

Following the directions given for capacitor installation on the ''A" circuit board, install the

electrolytic capacitors on the ''8" circuit board as follows:

DE SIG NATION DE SC RIPI`ION

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(dy--`:

HfiL

2. 2 mid. 10v. electrolytic

1000 mid. 25v. electrolytic

33 mid. 16v. electrolytic

Following the instructions given for diode installation on the ''A" circuit board, install the diode8 on

the ''8" circuit board as follows:

D3......................1N914

D4 ...................... 5. 6v. Zener

(jry'`' U8ing the excess resistor leads Clipped from resistor installation, form and install the 7

wire jumpers indicated by the solid lines printed on the clrouit board and shown in the parts

olacement diagram figure 4.

Install the multi-ton potentlometers R124 through R129. Install the controls try pushing an

three pins through the holes provided in the circuit board and then Soldering only the pin Closest

to the edge of the olrcuit board. Make sure that the control is perpendicular before soldering

the rear two pins Of each control.

ar' Ri24

(ryy` Ri25

( YF R126

(t - R127

( T,_ R128

(i- R12 9

50K multi-turn

When these controls have been Soldered in place, carefully pull the knobs from the shafts.

Save the knobs for re-installation in later steps.

Following the directions given for transistor installation on the ''A" circuit board install the

transistor on the ''8" circuit board.

¥9GNA#°T....................2N3391

TYPE NO.

EE-==-fi

Mount the integrated circuits following the directions for integrated circuit installation given for

the ''A" circuit board. Make sure that orientation is correct before soldering, once the unit is

in place it cannot be removed witbout destroying lt.

IJESIGNATION TYPE NO.

LM3900 or CA34olE Quad Norton Amplifier

748 op-amp

( tylp'Y Four "fleaw clips have been included to facilitate power supply cormeetion. hsert these

clips in the holes at the end Of the circuit board marked "++". "+ ", ''-" and " i ''.

Solder in phee.

In the following steps wires will be soldered to the ''8" circuit board which will later comect with

front panel controls and jacks. At each step strip 1/4 inch of insulation from each end and twist

and ''tin" the exposed BtrandB.

UBing the wire provided make the following connections to the circuit board.

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A 1-1/2 inch length to point ''NN".

A 1-1/2 inch length to point ''PP''.

A 1-1/2 inch length to point ''RR''.

A 1-1/2 inch length to print "SS''.

A 1-1/2 inch length to point 'TT''.

A 1-1/2 inch length to point lruu'l.

Pass the short wires installed in circuit board points ''NN" through ''UU" through the

unmarked holes in the circuit board as shown in figure 2.

(i7giv:,:i A 1-1/2 inch lezigth to point "W".

A 1-1/2 inch length to point 'W''.

Pass the wire just installed through the unmarked hole just to the right of circuit

board point 'WW".

A 1 inch length to point ''RT'.

A 1 inch length to point 'ryY"

Pass the wire just installed in circuit board point "YY" and the wire previously in-

stalled at point "W" through the unmarked 1/8 inch hole in the circuit board just to

the right of point ''YY''.

A 9-1/2 inch length to point ''ZZ''.

{.rp' A 1-1/2 inch length to point "AE".

( ,3f- Pass the wire just installed through the unmarked hole directly above circuit board

point ''AE„.

A 3 inch length to point ''AF''.

A 2-I/2 inch length to point "AG''.

A I-1/2 inch length to point ''AU''.

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(`)#'f Prepare a 2-3/4 inch length of the co-axial cable provided by stripping 1/2 inch of

insulation from one end and un-braiding the exposed shield wires. Twist the shield

wires tightly together and tin by melting a small amount of solder into the wires.

Remove 1/4 inch of insulation from the end of the exposed center conductor. Counect

the shield to cicouit board point "AK" and the inner conductor to point "AJ".

(+/Strip1/2inchoftheouterinsulationfromthefreeendofthepreviouslyinstalled

cable. Cut the braided shield flush with the outer insulation before stripping 1/4

inch Of insulation from the exposed inner conductor. Cormect the inner conductor

to circuit board point ''AL''.

Make the following interconnections between points on the ''8" circuit board.

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Comect the wire from point ''GG" to point ''AT''.

Connect the wire from point ''HH" to point "AS".

Connect the wire from point ''JJ" to point ''AP''.

Connect the wire from point "KK" to point ''AR''.

Connect the wire from point ''LL" to point ''AN''.

Connect the wire from point ''MM" to point ''AM".

''Dress" the wires installed above so that they all lie flat against the circuit board. The wires

may be held in place by pressing them down between conveniently placed resistors on the

circuit board.

This completes assembly of the 4780 ''8" circuit board. Temporarily set this circuit board aside

You are now ready to put together the light emitting diode. assemblies using the small 4780/C

circuit boards. This will be a delicate assembly and the instructions should be followed

EXACTLY to assure success.

I+.

Thoroughly scour the conductor side Of the ''C" circuit boards until they are bright

and shiny. Perform this step only when ready to prcoeed with the assembly to

prevent oxidation on the circuit boards. Oxidized circuit boards will require

soldering temperatures that are higher than can be tolerated by the parts that are

to be mounted. Rinse the boards with clear water and dry completely.

(tygiv^ Cut twelve 3/4 inch lengths of the bare wire provided. Lay the boards face dowfl on the

work surface with the conductor sides up. Insert one of the twelve 3/4 inch length of bare

wire into the hole in each of the twelve soldering pads and solder in place following detail

drawing figure 5.

The boards should now have the wires protruding out the conductor side with none of the wire

protruding from the component side of the circuit board. If there is a small bit of wire crowing

on the component side, clip it off flush with the circuit board.

You are now ready to mount the Light Emitting Diodes (LEDs). Fir.st examine this part carefully

and note that one of the leads is marked with a green band. This marks the cathode of the LED.

Observe that the rear side of the case is flat, while the front side is roughly dome shaped. In a

later step the dome shaped front of the package will mate with a hole in the front panel.

Bend the leads of the LED loosely back. DO NOT use pliers to form a right angle bend in

the leads. Make sure that the green band g.oes through the hole that is pal.t of the common

strip marked ''com" on the conductor side of the board. Insert the LEDs on the component

side of the circuit board and fold the leads tightly against the solder pads. DO NOT SOLDER

YET.

It is imperative that the LEDs not be subjected to excessive soldering temperatures. Before

each LED is soldered in place, carefully scrape the j2±g!E of its lead with a razor blade or

sharp knife to remove any oxidation that may have formed. (NOTE: the green cathode band

is on the Eg±Lof the lead. )

As each lead is scraped clean lightly solder it to the circuit board pads. Clip off each lead

as short as possible after it is soldered.

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LED-I.

LED-2

LED-3

LED-4

LED-5

LED-6

LED-7

LED-8

LED-9

I.ED-10

LED-11

LED-12

(-fy Prepare a 2-1/2 inch length of insulated wire by removing 1/4 inch of insulation from each

end and tinning the exposed wire.

Install the wire prepared above in the pad marked ''com" from the conductor side of

the ''C" circuit boards. Solder. Cut away any wire that protrudes from the component

side of the circuit board. This circuit board will become the top LED board and should

now look like the board shown in figure 6.

STOP

When this module is fully assembled the Light Emitting Diode Boards will be difficult to

service. At this point test the 4780/C boards using any size 1. 5 volt flashlight battery

as shown below. Make sure that the negative (-) terminal of the battery connects to the

''com" pad of the 4780/C board. Check polarity and soldering connections of any LED

that does not light.

Touch ''+ " of battery to each LED lead in turn.

You are now ready to connect the smaller ''C" circuit boards to the ''A" and ''8" boards. Note that

the larger boards have holes under the multi-turn potentiometers marked 1 through 6. The LED

boards have their pads numbered 1 through 6 also.

(`}~ Using the LED board with the wire installed in the "COM" pad, insert the bare wires

coming from points labeled 1 through 6 into the holes labeled 1 through 6 on the ''A"

circuit board. NOTE: These wires are to be inserted from the component side of the

''A''Circuit board. In a subsequent step this LED board will bend around so that it is in

front of the ''A" board. This will require that there be approximately 1/2 inch of the

bare wire between the two boards. The spacing will be correct if the ''C" board is just

slightly above the top of the multi-turn trimmers as shown in figure 7 when the leads

are soldered in place.

(7r'-' In a similar manner mount the remaining LED circuit board to the "B" circuit board.

(jgiv' Fasten the two "L" brackets to the "A" circuit board using one 4-40 X 1/2 inch

machine screw, one 1/4 inch spacer, one lockwasher and one 4-40 nut on each bracket as

shown in figure 8. Note that the unthreaded hole in the "L" bracket is used in this step.

\r,..,

In a similar manner fasten two ''L" brackets to the ''8" circuit board.

(tIr Position the mounting holes on the LED boards so that they are in line with the

threaded holes in-the ''L" bracket. In a later step. screws will pass through the front panel

and through the LED board into the threaded holes in the ''L" brackets.

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In a similar manner mount black pin jack J3.

In a similar manner mount red pin jack J4.

In a similar manner mount red pin jack J5.

In a similar manner mount red pin jack J6.

In a similar manner mount red pin jack J7.

One Light Emitting Diode remains to be mounted on the ''8" board. Just to the right of

the circuit board point "WW" are two holes marked ''LED" (left side of board). Solder

two of the ''flea clips" provided into these holes. Note that when properly installed the

upright portions of the "U" shape of this clip will be pointed toward the closest edge Of

the circuit board. (see figure 9)

(q# Install the two LED supporting flea clips.

Bend the leads of the LED ±gg±±!y back and slip them into the clips such that they are roughly

parallel with the surface Of the circuit board. The ends Of the LED should be even with the rear

edges Of the clips. Make sure that the unmarked lead goes into the clip that Connects to R6o.

Lightly solder the LED leads to the clips.

Placethefrontpanelface\downonasoftragtopreventmarringthefinish.

ae`' Place a blackpin jack (J1) in thehole provided as shown in figure 10. Fasten in

place with a tinnerman nut as shown in figure 11. Press the tinnerman out down firmly.

NOTE that all tinnerman nuts must be mounted verticly as shown in figure 10.

faS Ina Similar manner mount black pinjack (J2) as shownin figure lo.

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(`y¢ In a similarmanner mount red pin jackJ8.

In a similar manner mount red pin jack J9.

In a similar manner mount red pin jack J10.

(-`) In a similar manner mou[it red pin jack Jll.

(/t In a Similar manner mount red pin jack J12.

(|`' In a similar manner mount red pin jackJ13.

(|`'' In a similarmanner mount red pin jackJ14.

(rf h a Similar manner mount red pin jack J15.

(-i ln a similar manner mount red pin jack J16.

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In a similar manner mount red pin jack J17.

In a similar manner mount red pin jack J18.

¢}p/ Using two 440 X 1/4 inch screws. two 4-40 nuts and two lock nuts, mount slide switeh s1

„.,

in the position shown ln figure 10. Make sure that the points Of the 4-40 nuts do not interfere

with the travel of the slide inside the Switch.

Mount the SPST push button switoh S2 in the position shown in figure 10. Use the lockwasher

between the rear surface Of the front panel and the body of the switoh.

In a similar manner mount pushbutton switch S3.

Mount 500K potentiometer R135 in the location shown in figure 10. Use two 3/8 inch nuts,

one behind the front panel as a spacer and the second on the front side Of the panel to secure

the potentiometer. Adjust the rear nut so that none Of the threaded shaft Of the control is

exposed when the front nut is tightened down. This will allow the control knob which will be

mounted in a later step to seat as closely as possible to the front panel. Orieut as illustrated.

(a;# In a similar manner mount 500K potentlometer R136 in the location shown in figure 10.

rfu<.L# orient as illustrated,

In a similar manner mount 75K potentiometer R137. Orient as illustrated.

In the following steps interconnection wiring will be done on the front panel controls. At each step

cut the wire to the specified length and strip 1/4 inch of insulation from each end. Twist the exposed

strands and tin by melting a small amount of solder into the wire. (Bee figure 12)

110

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Prepare a 1-1/2 inch length Of insulated wire and connect lug #2 o£ Sl and lug #3 of R135.

Solder the connection at Sl but do not solder the connection at R135 at this time.

Cut one lead of loon resistor R139 (brown-black-yellow) to a length of 1/2 inch and the

other lead to a length o£ 1 inch.

(rty D"" Pass the 1 inch lead of the previously prepared resistor through lug #3 of R137 to lug #2 Of

R137. Pass the 1/2 inch lend of this resistor through lug #1 of R137. Solder the connection

at lug #2 of R137 but do not solder the connections at lug #1 and lug #3 at this time.

(ri}. Cut both leads of 4. 7K resistor R138 tyellow-violet-red) to a length of 3/8 inch.

( +)Y Connect one lead of the previously prepared resistor to lug #1 of R136 and the other lead

to lug #3 of R136. Do not solder either connection.

S:¢bys'"' Prepare a 2 inch lengthofinsulatedwire and connect lug#1 ofs2 to lug#2 ofs3. Solder

the connection at S3 but do not solder the connection at S2 at this t`ime.

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(dy~-' Connect the lead coming from the end of D5 that is marked with a colored band to lug #1

of S3. NOTE: Correct orientation of this diode is necessary for operation of the unit.

Solder this connection.

Connect the remaining lead of D5 to J1. DO NOT Sol.DER.

Peel the cardboard backing from the black ''dots" provided. Mount the dots over the LED

holes on the back of the front panel as shown in detail figure 10.

THE CIRCUIT BOARDS MAY NOW BE BOLTED TO THE FRONT PANEL AS FOLLOWS:

Using two each 4-40 X 1/4 inch screws and 61ockwashers, mount the smaller ''A"

circuit board to the front panel as shown in figure 8. Note that the ''A" circuit board will

be the top board of the two board stack and mounts approximately on an imaginary line

between R135 and R136. When mounting the board make sure that the shafts of the multi-

turn trimmers R41 through R46 align with the top-most row of large holes in the front panel.

Also make sure that the Light Emitting Diodes align with the row of smaller holes.

MAKE THE FOLLOWING CONNECTIONS BETWEEN THE ''A" CIRCUIT BOARD.AND THE

FRONT PANEL CONTROLS USING THE WIRES PREVIOUSLY INSTALLED ON THE CIRCUIT

BOARD. (see figure 13) Dress the wires against the front panel wherever possible.

rl-

Point ''J" to pin jack J1 (solder 2 wires at this point).

Point ''K" to lug #2 of R136 (solder).

Point "M" to lug #3 of S1 (solder).

Point ''P" to pin jack J16 (DO NOT SOLDER) .

Point ''R" to lug #2 of S2 (solder).

Point ''S" to lug #2 of R135 (solder).

Point ''T" to lug #3 of R136 (solder two wires).

Point ''W" to pin jack J2 (solder).

Point ''G" to lug #3 of R135 (solder two wires).

The remaining wires coming from the component side of the "A" circuit board will connect

to thg, ''8" circuit board in the following steps.

Connect the six wires that pass through the circuit board from points ''A" through

''F" to pin jacks J4 through J9 respectively. ro NOT SOLDER any of these

connections at this time.

BEFORE MOUNTING THE ''8'' CIRCUIT BOARD THERE ARE SEVEN CONNECTIONS WIIICH

MUST BE MADE TO PIN JACKS J4 THROUGH J9. h later steps these wires will connect to

points on the ''8" circuit board. Prepare each wire prior to installation by stripping 1/4 inch

Of insulation from each end and twisting and tinning the exposed strands.

A 5-1/2 inch length to J4 (DO NOT SOLDEI9

An 8 inch length to J4 (Solder three wires).

An 8 inch length to J5 (Solder two wires).

A 6-1/2 inch length to J6 (Solder two wires).

A 5 inch length to J7 (Solder two wires).

A 4 inch length to J8 (Solder two wires).

A 4-1/2 inch length to J9 (Solder two wires).

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.

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