Dyna FM-3 - Page 8

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TlGHTlN

HNSION

NUl

fiRMLY

WITH

LONG·NOHO

PurRS

SOLO£R

3

CORNUS

OF

HN510H

NUl

TO

CIRCUIT

aouo

MOUNTING

CAPAC.lTOR

C8

%" screw

in

the

hardware

bag.

Be

sure

that

the

points

of

the

nut

face

away

from

the

screw

head,

and

run

the

nut

out

on

the

screw so

that

it

is

at

least

1;2"

from

the

head.

Insert

the

tabs

of

the

capacitor

into

the

matching

cutout

on

the

board.

Note

the

location of

the

wire lead.

Hold

the

capacitor

firmly

against

the

board,

and

turn

the

screw

in

from

the

bottom

(see

detail

"D")

until

the

spring

tension

nut

is firmly seated.

Now

tighten

the

nut

with

long-nosed pliers, while

pressing

the

capacitor

to

the

board.

The

points

of

the

nut

must

dig

into

the

copper

so

that

the

capacitor

mounting

is

absolutely

rigid.

Solder

the

nut

to

the

board

at

three

points.

Insert

the

top

lead

of

the

capacitor

into

the

hole

indicated

in

the

pictorial,

keeping

it

as

short

as

possible,

and

solder

the

lead.

7 (

j)

Mount

the

special

temperature

compensating

ca-

pacitor

C7 (2.55

nunfd

N2200,

with

six color

stripes)

as

shown

in

the

pictorial.

Make

sure

it

is

seated

snugly

against

the

board

and

against the

tube socket.

Solder

both

leads.

8 (

J)

Mount

the

I.F.

transformer

Tl

(one

of

the

four

marked

432001)

on

the

board.

Note

the

indicator

(a

slot

or

color

marking)

in

one

corner of

the

top of

the

can.

Be

sure

to

mount

the

transformer

with

this

indi-

cator

oriented

as

shown

in

the

pictorial.

The

trans-

former

should

snap

into

place

and

seat

firmly

against

the

board.

Solder

the

mounting

tab

next

to C12 first,

but

do

not

solder

the

other

mounting

tab.

Solder

each of

the

four

cormecting lugs. Avoid excessive

heat,

but

be

sure

a good connection

is

made.

Do

not

use too

much

solder, to

prevent

any

excess from

running

into

the

transformer

and

damaging

it.

g ( ,}) Observe

the

direction

of

the

offset

in

the

ground

straps

as

shown

in

the

pictorial

diagram.

Insert

the

ground

straps

into

their

slots

in

each

of

the

tube

sockets.

Solder

both

to

the

board

..

W() )

Insert

a

round

toothpick

or

similar

instrument

into

eyelets

#2

and

#4

from

the

bottom

of

the

board.

The

purpose

of this is

to

prevent

solder

from filling

these eyelets. Now

solder

the

eyelets

to

the

copper

on

the

board

and

remove

the

toothpick.

(These

eyelets

may

already

have

been

soldered

when

you

receive

the

board.)

Be

certain

a good

connection

is

made

all

around

each

eyelet

as

this will be diffi-

cult

to

check later.

Insert

the

two

heavy

leads

of

the

antenna

coil

L\

into

eyelets

#2

and

#4.

Note

that

this coil

is

mounted

on

the

bottom

of

the

board,

and

is

oriented

to

align

the

center

slug

with

the

hole

in

the

board.

Solder

the

two leads

to

the

eye-

lets

on

the

top of the board.

It

may

be

necessary

to

scrape

the

coil leads,

or

to ream

the

eyelets

slightly

if

the

inside

of

the

eyelet

is

not

perfectly

free of

solder,

as

this is a

very

snug

fit.

t

fJ

.

'~

•

c:

,

4 (

J)

Refer

to

the

pictorial

diagram,

the

parts

list for

PC-7,

and

the

values

marked

on

the

individual

ca-

pacitors.

Insert

all the disc

capacitors

as

shown in

detail

C.

Make

certain

that

the

body

of

each

capac-

itor

touches

the

board.

Bend

the

leads

slightly

to

prevent

them

from falling

out

when

the

board

is

inverted

for soldering.

Solder

all leads.

NOTE

CAPACITOR

BODY

TOUCHES

BOARD.

DETAIL

D

6(

J)

The

oscillator

trimmer

capacitor

C8 is a white

tubu-

lar

ceramic form

with

a

#6

screw

and

special

spring

tension

nut.

The

nut

is

supplied

threaded

onto

the

DETAIL

C

5

(I

)

Mount

the

oscillator coil

lA

(the

one

with

four

leads

at

the

bottom)

in

the

group

of four holes in-

dicated.

The

two

heavier

leads

are

inserted

in eye-

lets

#10

and

#11.

Mount

the

mixer coil 1.3

(the

one

with

only two leads

at

the

bottom

and

none

at

the

top)

in

eyelets

#7

and

#8.

Be

sure

it

is

oriented

as

shown

in

the

pictorial

diagram.

See

that

each

coil form is

seated

firmly

to

the

board

and

solder

all six coil leads;

the

eyelets

must

be firmly sol-

dered

to

the

coil

leads

and

to

the

copper

foil.

8

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