Cadence ZRS C8 Instruções de Operação descarregar pdf (Página 76)

nuna

I

(3)

Repeat

(2)

above for

any inoperative

band,

using frequencies

designated

in

a

above. This

will

check

the

follon'inq

comnonents:

Conlponents

hearcl.

the

crystal

calibration

oscillator

ma1'

be

defective.

Check

the follou'ing

points

in turn:

o.

Check

the

voltage

at

terminal

B

of Vb

(trlate

of caiibration

oscillator).

Ò.

Check the

band

switch

ancl

resistors

RBB.

RSl,

anrl

R35.

c.

Check L3,

R13,

C26

and the 10K-ohm

re-

sistor

in

the T12

assembl-v.

d.

Check

for

an

oscillator

gricì

voltage

of

-25

volts

clc.

If there is

considerable

variance

from

this

value, check

R14

and

C25, the

cr-vstal,

and

the

tuning

of

T72.

e.

If the

beat signal is

present

on

all bands,

but not

present

on band 4,

C54 is open

or ANT.

TRIMMER

control might

need

retuning.

85.

D-c

Resistonces

of

Coils

qnd

Trons-

formers

of Power

Supply

PP-308/

URR

C

rvinding

of T1

(secondary).

B rvinding

of T5

(seconclaly).

D

n'inding

of T5

(secondary)

and 2,400-spf

ca-

pacitor.

f

. Antenna

Terminal

A.

(1)

If no

signal

is

heard,

check

the

con-

tacts

of relay

K1,

PHN.-C.W.-NET-

CAL.

srvitch,

band

switch,

primary

of

T1,

and

the internal

capacitor.

(2)

Repeat

the

procedure

for

any inopera-

tive band,

using frequencies

desig-

nated in

a

above.

This rvill

check

T1

and T5

and

the following

components:

et..l

i

Components

Primary

of

C rvinding

Primary

of

B

rvinding

and

band srvitch.

Primary

of

D

rvinding

of T1 and

band switch.

of T5, internal

capacitor,

of T5 and

band switch.

83. Bfo

Signol

Substitution

Tests

Turn

PHN.-C.W.-NET-CAL.

sl,vitch

to

C.W.

Feed

an

unmodulated

signal

at

455

kc

through

a .05-pf

series capacitor

from

the

signaì

genera-

tor to

pin

6 of

V3

(signal grid

of the

converter).

A tone

signal should

be heard in

the

loud-

speaker

or headphones, If not,

check

tube V7:

tube voltases;

C44

(B.F.O.

trimmer)

;

T13 for

misalinement,

open,

or short; internal

capaci-

tors,

75

p,.f

and 53ó

p.p.f;

and the 150K-ohm

resistor.

Check

resistors R28,

R29,

and R11

and

capacitors

C41. C43,

ancl

C24. The

voltage

measured at

thr bfo

gricl,

pin

4 of V7,

should

ire

betu'een

-15

nnd

-20

volts dc.

84.

Crystol Colibrotion Signol

Tests

-iurn

PHN.-C.W.-NET-CAI-. sr.r'itch

to CAL.

ne

the

receiver thror"igh

the entire tuning

:se for

each bancl.

A

beat

note should

be

irtl

every

200 kc

on the dial. If

no

signal is

ó8

The

d-c resistance

of the transformers

coils in the

power

supply

are listed below:

2

o

i

and

2

o

Trans-

former

or

coil

i

i

Ohms

I

Special conditions

Terminals

80

1'

T102

7to2

2toB

3to4

4to5

A

't

.1

.2

.2

A

.1

^

l4

160

160

I .|.)

6to7

7to8

8 to 9-- --

9to10

11to12

- --

13

to

14

14 to I5

16 to 17

I-'-

T103

7 to2--

180

Zto3

180

4toD

,.

.t

DtOt) -

.t

L106

" 7.2

L107

1.2

i

L111

10

L112 i0

K10 ì

50

i.101 E101--ll

to;l

.01

Vibrator

E101 removed

i-I02

E101-2

to 2

.04 from

socket. Meas-

I-103

E101-{

to

I

.04

urements

are

taken

AGO 313A

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