Sony TR-714 User manual

SERVICING GUIDE

TR

-7

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Specifications

for

TR-714

Circuit 7

transistor

superheterodyne

Covering

range:

M.W. 535~1,605 Kc

IF

frequency

Sensitivity

Selectivity

Output power

Current drain

Speaker

Battery

Dimensions

Weight

Color

S.W.

3.9~12

Mc

455

Kc

M.W.

50

pV/m

with

built-in

ferrite

bar

antenna

Better

than

5

µV/m

with

external

aerial

(effective

heiget

5 m.)

S.W.

60

µV/m

with

telescopic

antenna

Better

than

5

pV/m

with

external

aerial

(effective

heiget

5 m.)

Better

than

17

db

(±10

Kc off)

50

mW

(non

distorted)

7

mA±20%

at

0

signal

2¼

''

PM

dynamic

speaker

(8

52)

9

Volts

BL-006 P,

Eveready

216

or

equivalent

116x76x33.5mm

(4½"x3·

1

xl¼'')

350

gr.

(12.5 ozs.)

Cream,

Dark

green

and

Dark

grey

-1-

Adjustment

Mixer

stage

Operating current

The

current

can

be

known

from

voltage

drop

across

R

3

which

is

normally

0.66~0.77

Volt.

Sinc:e R3

=2.2

KQ,

the

current

will

be

300~350

µA.

Tracking

M.W.

band

i.

Adjust

core

of

L,

to

receive

1,680

Kc

(upper

limit)

with

the

variable

condenser

set

at

minimum.

Then

adjust

trimmer

C,-

,

to

receive

520

Kc

(lower

limit)

with

the

variable

con-

denser

set

at

maximum.

ii.

Adjust

L,

to

get

maximum

output

at

640

Kc.

iii.

Adjust

C,-,

to

get

maximum

output

at

1,400

Kc.

iv. Confirm

that

520

Kc

and

1,680

Kc

can

be

received

at

each

extreme

position

of

the

variable

condenser.

S.W. band

i.

Adjust

L3

to

receive

3.82

Mc

(lower

limit)

with

the

variable

condenser

set

at

maximum

and

adjust

C,-3

to

receive

12.8

Mc

(upper

limit)

with

the

variable

con-

denser

set

at

97°

(counting

from

maximum

position).

ii.

Adjust

L,

to

get

maximum

output

at

3.82

Mc.

iii.

Adjust

C,-,

to

get

maximum

output

at

12.8

Mc.

Helpful informations

1.

In

higher

frequency

range

the

local

oscillator

frequency

varies

when

the

antenna

circuit

is

adjusted.

This

variation

leads

to

misadjustment.

To

get

proper

result

the

following

process

is

recommended.

When

C

1_1

is

adjusted,

change

signal

generator

frequency

slowly

until

peak

output

is

given

by

the

set

under

adjustment.

Then

turn

tuning

knob

of

the

set

to

tune

to

the

new

signal

frequency.

Adjust

again

C,.

1

to

get

peak

output.

Repeat

this

procedure

for

2

or

3

times.

When

proper

adjustment

is

accomplished,

highest

output

will

be given.

Around

12

Mc,

image

frequency

may

come

into

the

adjustable

range

of

the

trimmer.

The

image

frequency

can

be

distinguished

as

follows.

When

the

signal

generator

frequency

is

changed

with

the

tuning

knob

of

the

set

fixed, 2

frequencies

will

be

received.

Among

them,

higher

frequency

gives

image.

2.

When

the

set

is

mounted

in

the

cabinet

after

tracking

adjustment,

alignment

of

RF

section

is

affected

by

grille

plate.

To avoid

this

trouble,

the

tracking

adjustment

must

be

performed

after

the

set

is

mounted

in

the

cabinet.

To take out

the

set

from

the

cabinet

1. Remove

back

cover

of

the

cabinet

and

detach

shielding

plate.

(This

shielding

plate

must

be

attached

without

fail

after

the

set

is

mounted

in

the

cabinet,

because

it

is

important

to

keep

the

set

from

body effect.)

2.

Remove

screws

under

the

ferrite

bar

at

the

right

end

and

on

the

right

side

of

the

cabinet.

-2-

~

)

To

roi

antenna

(SW)

Green

MWAnt

SWO

Ciq)

_C2

L2

MWAnt

•

To

ext

.

antenna

(

MW)

I r

r,__

""

I-

--1

~--__.

(''

~

'-"'

Battery

hoLder

0

J ;

~2~r~~:_

Yell

ow

/

\.

s

C>

N

y-

o::~lac~--

~ ·

i......::::

Bl

=a

c

=k--+--O----U

~

ftn

•

...,

,,...

,,.-,.__

-

Rio

-IC-

' ·"

~

W

hite

@~

J

~ t - ..-

T r

. - - •

v-

,!

.T .

''=--f'

C2-1

C

2-

"'(

ff'

t

MWOSC

/1

I

S.WAA

@

® To

Speaker

VA-VG

ANT

SA-SW

ANT

BA-MW

ANT

VO-VG

OSC

@

~~~~~~g

SOe,;,.

~H

C11

~

[id

To

grownd

~

I

Mounting

diagram

of

TR-714

(Printed

side)

C22,....

C21

X4

.i:,..

7 2~1

~KsR1oiF1\·-Mw

c9

-\onthecircuit

3

OSC•

SW

(}SC

Mounting

of

TR-714

) )

T

0

VO

on

the

circuit

board

C21

T

0

VA

on

the

circuit

board

circuit

b0ard

board

x,

X,,1

Schematic

diagram

of

TR-714

Parts

list

for TR-714

--

Symbol

Description

Symbol

De

s

cription

L,

SW.

Ant.

coil Ria lOK!J 5%

¼W

LA-034-lQ

R"

56

K.!2

II

L2

MW.

Ant.

coil R

1,

820.Q

II

LA-035-lQ

R1s

820

.Q

II

L,

SW.

Oscillator

coil

R1

1 lOKJ'J

II

LO-027-AQ

R1

s 56KJ'J

II

L,

MW.

Oscillator

coil

R1•

5

.Q

II

LO-026-AQ R

,o

680

.Q

II

IFT1

LI-021-AR

R2,

220

.Q

II

IFT2

LI-021-BR

R

22

5.6K.Q

II

IFT

3

LI

-021-CR R

2a

220

.Q

II II

T1

TI-002-04 R

,.

22

.Q

II

I/

T2 TX-002-04 R

,s

22

.Q

II II

SP

2

¼"

8Q

R

21

2.2K.Q

II

J

Earphone

jack

C,-1

.

C1

-2

PVC

-

2JT

R1

30K!!

5%

¼W

C

2-

1.

C,.,

Trimmer

condenser

C,.,. C

2-

•

R,

4.2

K!!

"

II

Ca

2pF

(

Styro

l)

Ra

2.2

K!!

" "

c.

0.

05µF

R,

220

Q " " c,

0.

01

µF

R,

CD

100

K!!

"

II

c.

370

pF

(

Styrol

)

Rs

470

Q

II

" C1

2000pF

(

"

)

R1

820

Q "

II

Cs

170pF

(

II

)

Rs

7.5

Kfl

" "

c

•.

1. c•.

,®

20

µF

10

V

Block

R.

22

K!!

" "

C10®

lOµF

3V

Rio

4709

" "

Ca

2

pF

(

Titanium

)

R11®

5

K!!

II

"

C1,

0.01

µF

(

MXL

)

R12

1.2

K!!

II

"

cl3

200

pF

(

Styrol)

CD

To

be

adjusted

when

X,

or

Xa

is

replaced.

®

Volume

control

with

switch.

®

Electrolytic.

-5-

Symbol

Description

c"

0.01

µF

(

MXL

)

C1sCD

2

pF

(

Titanium

)

C1

s®

10µ

3V

C11

200

µF

(

Styro

l)

Cis

0.02

µF

(

MXL

)

C19@

5µF

6V

C,o

0.001

µF

(

MXL

)

C21

®

5µF

6V

C,,@

30µF

3 V

c,

,

0.05

µF

(

MXL

)

C2

, 5

pF

(

Styrol

)

C21

lOpF

(

II

)

C"

0.02

µF

(

MXL

)

c,.

®

lOµF

10V

X1

2T201

(2SA122)

x,

2T76 (2SC76)

Xa

2T76 (2SC76)

x,

2T66 (2SD66l

x,

2T65 (2SD65)

x.

2T65 (2SD65)

X1

2T65 (2SD65)

D1

1T23G

D2

1T23G

D,

1T52

Voltage

and current

distribution

for TR-714

Vo

ltage

I

Volt

Current

E 7,s

X1

B

6.5

,s

300

~

350

µA

5

00

µA

C 0

--

E

0.31

x, B

0.41

300~350 µAs

oo

µA

C

8.3

,s

--

E

0.31

Xa

B

0.51

65

~

750

µA,. 5

mA

C

8.3

,s

--

E 0.

75

x, B

O.85

1~

1.1

mA

2•5

mA

C

7.3

,s

--

E

O.75s

x, B O.

85

s 1~

1.1

mA

2_5

mA

C

7.8

,s

--

E 0

Xs.

X1

B

0.151

650~750

µA,.,

mA

C 9

,s

Current

drain

at

O

signal:

7

mA±2O

%.

Measurement

was

performed

with

the

negati

ve

lead

of

the

voltmeter

connected

to

the

negative

side

of

the

battery.

Internal

resistance

of

the

voltmeter

is

20

KSJ

/V.

Small

figure

data

shows

voltmet

er

range.

Power

source

voltage:

9

Volts.

-6-

Sony TR-714 User manual

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