Cadence ZRS C8 Instrucciones de operaciones descargar pdf (Pagina 72)

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Figure

38.

Rad,io

Eeceiuer

R-lf4/URR,

top

aiew

of

Note.

Do

not

remove

r-f

and

i-f

shields

from

the

chassis

or

shield

cans

from

the tuned

units

until

the

trouble

has

been

traced

definitely

to

the

particular

unit.

Do not

damage

wiring

by

pushing

it

back

and forth

during

inspection.

Be

careful

not

to damage

the

re-

ceiver in

any

other

way.

d.

Misalinement

of one

or

more

stages

of the

receiver

will

cause

reduced

output.

Misaline-

ment

of the

h-f

(high-frequency)

oscillator

may

prevent

any

output.

e.

When trouble

is

localized

in

a

given

stage,

test the

tube,

measure

the voltage,

and measure

the

resistance

of the tube

socket

of

that

stage.

/".

Troutrle

in

a circuit

or

stage

may

not

cause

changes in

voltages

and

resistance

meas-

rrements

at the

tube

socket.

The notes

included

n

this

paragraph

are merely

a

guide

and

-houlcl

suggest

other

procedures,

such as

volt-

64

'

-.,r.,,.'"l.ul--

:'.-.':

:

I:

....;y].gx!gi;

chassis

toítlt coaer

remooed.

age and resistance

measurements

on

individual

parts.

g.

Remove

only

one tube

at

a time

when

testing.

Check

the number

of

the

tube

and

test

it;

if

the

tube

is not

defective,

return

it

to

its

proper

socket

before

another

tube

is

removed.

h.

Each

step

presupposes

the

satisfactory

completion

of all

previous

steps.

Isolate

ancl

clear

any

trouble

located

before

proceeding

with

any

succeeding

steps.

80. A-f

Signol

Substitution

Tesrs

a. High

OutTtut.

In

these

tests,

turn

OUT-

PUT

HIGH-LOW

switch

54 to HIGH,

and

ap-

ply

a 1,000-cycle

audio

signal

from

an audio

generator

through

a .05-pf

(microfarad)

capac-

itor.

î8

f4

tt

nt

fc

:

&.:-:.

AGO

313A

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