Dyna FM-3 - Assembly of Circuit Boards; RF Circuit Board (PC-7) Assembly

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ASSEMBLY

INSTRUCTIONS

You

will first

assemble

the

three

etched

circuit

boards

PC-7,

PC-8

and

PC-12,

and

then

mount

these

and

other

components

on

the

chassis

and

complete

the

wiring.

The

use of

protectively

coated

circuit

boards

in

the

Dynatuner,

on

which

most

of

the

components

are

mounted,

greatly

simplifies

assembly

of

the

kit,

and

contributes

consider-

ably

to

its

outstanding

performance.

Close

attention

to

the

suggestions

made

here

will

enable

you

to

realize

the

fullest

capabilities

of

the

Dynatuner.

On

each

etched

circuit

board

all of

the

cOlll.ponent posi-

tions

are

diagrammed

on

the

top

of

the

board

(the

side

without

the

copper).

The

identification

symbol

for

each

component

is

marked

between

the

holes

into

which

its

leads

will be

inserted.

Resistors

may

be

identified

from

the

color

code

on

the

parts

list.

The

first

color

stripe

is

nearest

the

end

of

the

resistor.

Any

fourth

color

stripe

may

be

ignored.

Each

capacitor

'is

marked

with

its

value

and

any

special

characteristics.

Other

special

components

will be

identified

as

they

are

called

for in

the

assembly

process.

To

speed

assembly,

it

is

suggested

that

you

first

compare

the

com-

ponents

with

the

parts

list

and

sort

them

accordingly.

The

edge

of a

corrugated

box

makes

a

handy

storage

rack

for

resistors

and

small

capacitors.

Before

starting

assembly

of

the

etched

circuit

boards,

observe

detail

A.

A

GOOD

SOLDERING

JOB

IS

ESSEN-

TIAL

TO

THE

SATISFACTORY

PERFORMANCE

OF

YOUR

TUNER.

Soldering

to

etched

circuit

boards

is eas-

ier

than

conventional

point-to-point

wiring

when

it

is

done

correctly.

The

copper

side

of

each

Dynatuner

board

is

coated

with

a

corrosion

inhibitor

which is

also

conducive

to

soldering,

but

there

is

no

substitute

for good

soldering

technique.

SNIP

OFF

EXCESS

LEAD

I

CORRECT

SOLDER

CONNECTION

NOTE

BODY

OF

RESISTOR

IS

PRESSED

TIGHT

TO

BOARD.

MAKE

SOLDER

flOW

SMOOTHLY

FROM

LEAD

TO

COPPER.

SNIP

OfF

EXCESS

LEAD

CLOSE

TO

SOLDER.

DETAIL

A

Be

sure

that

enough

heat

reaches

both

the

copper

on

the

board

and

the

wire to be

soldered

to

make

a

smooth

solder

junction.

When

making

connections

to

the

eyelets,

be

sure

that

the

solder

flows from

the

wire to

the

board,

across

the

eyelet,

so

that

the

eyelet

is

soldered

to

the

wire

and

to

the

board

at

the

same

time.

Tlw

insulating

wax

or

enamel

used

on

the

leads

of

some

components

(capacitors,

chokes)

may

prevent

good

contact

when

these

leads

are

soldered,

if

all

of

the

insulation

has

not

been

removed

from

that

part

of

the

lead

which

is to be soldered. Avoid

getting

solder

on

the

outer

}S"

edge

of

the

boards.

This

area

contacts

the

chassis

when

the

boards

are

installed

and

solder

splashes

here

will

prevent

~miform

contact,

stressing

the

board.

ASSEMBLY OF

THE

R.F. CIRCUIT BOARD

PC-7

l(

J

Position

the

PC-7

etched

circuit

board

in

front

of

you

as

in

the

pictorial

diagram.

Support

the

board

over

an

open

box

or

between

two

objects

so

that

the

leads

from

the

components

may

project

through.

Insert

all

of

the

one-half

watt

resistors

in

their

places

on

the

circuit

board.

To

bend

the

leads

of

each

resistor

to

the

correct

shape,

hold

the

resistor

between

the

thumb

and

forefinger of

one

hand

and

bring

the

thumb

and

forefinger of

the

other

hand

just

across

the

ends

of

the

body,

bending

the

leads

as

in

detail

B.

It

will

help

in

rechecking

your

work

to

orient

the

color

codes

of

all

resistors

uniformly.

Spreading

the

leads

slightly

after

installation

will

hold

the

resistors

flush

to

the

board,

so

that

they

will

stay

in

place

when

the

board

is

inverted

for

soldering.

Solder

each

lead

with

a

small

amount

of

solder.

The

solder

should

flow

smoothly

all

around

the

lead

on

to

the

copper.

Cut

off

all

excess leads.

Be

careful

not

to allow

the

lead

to

form a bridge

to

another

portion

of

the

circuit.

DETAIL

B

After

soldering,

there

should

be

no

space

between

the

bodies

of

the

resistors

and

the

top

of

the

PC

board.

If

there

is,

the

resistor

should

be

gently

pressed

to

the

board

while

the

soldered

leads

are

reheated,

until

the

resistor

is flush

with

the

board.

This

also

applies

to

other

components

mounted

in

the

following

steps.

2('))

Insert

the

3.9

microhenry

choke

L2

and

the

heater

choke

L5.

Insert

aU

the

one

watt

resistors. Do not

confuse

the

larger 2

watt,

10,000

ohm

resistors to

be used

on

PC-B

with

the

one

wall

resistors used

here.

Insert

the

2.2

mmfd

tubular

capacitor

Cll

(red-red-white-gray

dots).

Invert

the

board,

solder

each

lead

of

these

components

and

trim

off

the

excess.

3

(;;

Insprt

the

two 9 pin

sockets

VI

and

V2.

Note

the

location

of

the

flat

side

of

each

socket.

Be

certain

that each lab goes

into

its hole

and

dor:s

not

bend

over on top of

the

board.

Seat

each

socket

firmly

to

the

board

and

then

solder

each

pin

and

the

cen-

ter

ground

pin.

7

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