Gte sylvania Rq4747 User manual

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SYLVANIA STEREO

HI-Fl

SUPPLEMENT 2 TO

BULLETIN: R74-3

FACTORY

PREPARED

TECHNICAL

SERVICE

DATA IIndex on

Page

22. /

SERVICE

PUBLICATIONS

DEPARTMENT

Entertainment Products Group

700

Ellicott

Street.

Batavia,

N.Y.

,._

,u

pp

!e

meot_

in

_

tr~u

_

ces

the R74-4 chassis,

_and

~odel

R04747. . .

..,R7

4-4

chassrs

1s

similar to the R74-J chass,s, with the addition of a

new

muting panel and

CD4

demodulator arcurts.

_,te

schematics

and parts lists for the R74-4 chassis are

given

in

this supplement.

END

CAP

-LEFT

HAND

74

-

36448·2

_

J

tl

, I

\

DIAL

BEZEL

74-34928-1

VENT

-CABINET

TOP

74-34773-1

COVER GLASS

74-34762-1

TUNER BEZEL

74-34763-5

KNOB -TUNING

74-34861-2

NUT

·

HEADPHONE

JAC

KMOUNTING

7

0-32649-1

TOGGLE SWITCH

74-34797-1 BALANCE

CONTROL.

74-34859-1

KNOB -BASS,

TREBLE

(INNER SHAFT)

.74-34862-1

NON-SKID PAD (4)

86-28719-5 KNOB -BASS,

TREBLE

(OUTER SHAFT}

74-34863-1

MODEL: RQ4747

CHASSIS: R74-4

IMPORTANT: Always use genuine Sylvania replacement parts and tubes.

-1.

KNOB-VOLUME

74-34861-1

END

CAP-

RIGHT

HAND

74-36448-1

PUSHBUTTON

74-34913-1

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C

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-

SUPP.

2 TO A74•3

EMENT

PARTS

LIST -

-

REPLAC

SC

HEMATIC

SERVICE

~ING

-

~

DESCRIPTION

fo~~~~TIC

~!~~I~~

-

OESCRlrT~

- h

,wise

specified)

CAPACITORS

(All

values

in

MFD,

unless

ot e

CAPACITORS

(CONTINUED)

·

csm

-

·.

·

~·

43

:Sj

24s-0

--

~·

1x1s:

·1

60

v-i

C2

C3

C4

cs

CB

C10

C14

C16

C18

C20

C22

C24

C26

C28

C30

C32

C34

C36

C38

C40

C42

C44

C46

C48

cso

C52

CS8

C63

C76

C78

CBO

C82

C84

C86

-C88

C94

C96

C98

C100

C102

C104

C106

C112

C114

C116

C118

C120

C122

C124

C128

C134

C\36

C\38

C\42

C\44

C146

C148

C302

C306

C308

C314

C316A

C316C

C318A

C318C

C320A

C320C

C322A

C322C

C324

C326

C344

C346

C402

42-34768-1

42-34941-1

42-1814&1

Mein Tuning

Gon

g

33or F,

zsr

33

0Pf

,

ZSP

33orF,

zsr

330PF.

zsr

10Pf,

NPO

18Pf,

NPO

.

01

, 100v

3.

3Pf

,

NPO

330Pf,

ZSP

3.3Pf ,

NPO

,01, 100V

.01, 100v

Trimme

r

.01,

100v

.01. 100v

.01

. 100v

33Pf, N150

.02.

100v

.02, 100v

,01, 100V

.

01

. 100v

,02, 100V

33Pf

.01, 100V

330Pf,

ZSP

820Pf,

ZSP

,01, 100V

Ceramic

Trimmer

.

01

, 100V

.01, t1l0V

10PF, NPo'

.01, 100V

100PF,

ZSP

.

05

,

sov

.05

,

SOV

.01, 100V

100PF,

ZSP

.OS

, 50V

330Pf,

ZSP

.01, 100V

4.

7PF

, N150

4700PF,

ZSU

.

05

,

SOV

.02, 100V

.01,

100V

15PF

.01, 100V

2.2PF,

NPO

.05,SOV

33PF, N150

.05,SOV

180PF

,

25P

560PF,

ZSP

270PF,

ZSP

.047

, 150V

100PF

,

ZSP

.0082

.

022

, 250V

.047, 150V

.039

.0068

.22,

150V

.039

.0068

.039

.22

, 150V

.01,

100V

.

01

,

100V

.01,

100V

220PF

,

25P

.1, 150V

,c500 j

,.

L,

~,3

::9

~ :h .:. ,oos,

1so

y_~

cs

oa ,1, 150v

••·•

.2.

e510 ,1,

160V

C512 ,1,

150V

CS34

,1,

150V

C540

.01

,

100V

C603

,01, 1

OOV

C606 ,047,

150V

C608 ,047, 150V

C610 820PF, 25P

C614 33PF, N\

50

C618 ,1,

150V

C620 .1, 150V

C622

1200PF, Z

SP

C624

560PF,

ZS

P

C625 .

01,

1

OOV

C627

.

01,

100V

C629 5.6PF

::632 10PF, NPO

C634 .01,

100V

C636 .

01,

1

oov

C638 330PF, 25P

C640 330PF, 25P

C642 .

01,

150V

C644 ,

01,

100V

ELECTROLYTIC CAPACITORS

(Values

are

shown

as

: MFD/Working

Voltage)

CS4

C60

C72

C74

C90

C92

C108

C132

C140

C150

C151

C301

C310

C312

C342

C514

C516

CS18

CS20

CS22

C524

C528

C530

C532

C536

C538

CS44

C560

C562

C602

C604

C612

C616

C626

C628

C630

41-32477-46

41

-32477-85

41-32477-85

41-32477-46

41-32477-

85

41

-32477-3

41

-32477-47

41

-

32477-86

41-32477-9

41-32477-33

41-23765-16

41-32477-9

41-32477-86

41-32477-85

41-363

86

-1

41-36386

·1

41

-

36386

-1

41

-

36386

-1

41

-

32477-67

41-32477-67

41-32477-95

41-32477-67

41-32477-

95

41-32477-67

41-23765-5

41-23762-54

41-32477-

34

41-23765

-

17

41-32477-86

41-23765-17

41

-

32477-50

41-32477-

51

5/25V

1/50V

1/SOV

5/25V

1/50V

10/15V

10/25V

2/50V

100/6V

10/15V

1/50V

100/6V

2/50V

1/SOV

5000/40V

500/35V

500/SOV

500/35V

500/SOV

500

/35V

500/35V

5/25V

100/15V

25/15V

2/50V

2/SOV

50/25V

100/2

5V

POLYSTYRENE CAPACITORS

C56

C64

C68

C70

C126

40-28121 ·1

40

-28121 ...

40-10285-13

40-10285-1J

40-10285-

50

10

OOOPF

•S

OV

2500PF • 50V

330PF . 1

25

V

330PF , 125V

390

rF

. 12

sv

SERVICE - _

--REPLACEMENTP

ARTS LIST (CONTINUED) -

DESCRIPTION

SCHE

MATIC

CODING SERVICE

f

l'IG

PART NO.

1s1ST

O

flS

(All

1/4W, Carbon, 5_

%,

unless otherwise specified) PART

NO

. DESCRIPTION

RESISTORS

(C~EDI

124

21

121

30

132

IM

11131

111aa

11140

11142

11144

Jl

141

111

48

37

-14576-5

37-1457&15

660 ohm

10K

3.

3K

1K

4.7K

270ohm

22K

10K

22K

330 ohm

1K

100 ohm

5.

6K

270 ohm

180 ohm

820

ohm

15K

330 ohm

390 ohm

16K

1K

1K Variable • FM Meter Zero

1.

5K

150 ohm

4.7K

330

ohm

Variable • Separati

on

220 ohm

3.

9K

3.

9K

470 ohm

100K

470ohm

100K

33K

22K

10K

2.

2K

100 ohm

56K

100K

330K

10K

120K

100K

120K

100K

56K

33K

1K

10K

22K

1K

150 ohm,

1r:m.

10%

1K

22K

82K

I .SK

560 ohm

10K

2,K

120K

4.7K

33 ohm

150K

33K

470

ohm

3.3K

10K

150K

100K

10K

R149

RISO

R152

R301

A304

A306

R308

R310

R312

R314

A315

R316·

R318

R320

R322

R324

A324A, C

R326

R402

R404

R502

A504

R506

R508

R512

R514

R516

R518

R520

R570

A572

R602

R604

R606

R607

A608

R609

A610

A612

R614

R616

R618

R620

R622

R624

R626

R628

R630

R632

R634

A636

R638A8/

CD

A638AC ·

R638BD

R639

R640

R642

R644

R646

R648

R650

R652

R654

R656

R658

R660

R662

R664

R668

R672

R684

RG86

R688

_R690

37

-3461

1-3

37..!2053-3

37-22053-3

37-34651-1

37-34908-2

37-34909-2

37-33717-6

36-34726-7

•

36

,-

34726-0

100K

18K

4.7K

100K

10K

IOK

120K

220 ohm

820 ohm

47K

(Ea

r

ly

Prod.I

4.7K

3.

6K

4,3K

3.

6K

7.

SK

4.3K

47K

SOK

Variable -

Four

Section

Volum

e

4.7K

3.3

meg.

1/2W, 10%

68ohm

68 ohm

330 ohm,

1W

, 10%

10

meg.

1/21'1

. 10%

3.

9K

2.

2K

220 ohm, 1W, 10%

220 chm, 1/'ZW, 10%

SK Var

ia

ble •

C04

Balan

ce

SK

Variable -

CD4

Balance

180K

33K

3.3K

5.

6K

10K

4.7K

100K

Var~ble

•

Four

S

e.:

:ion Ba

s.s

100K Va

riable•

Four Section Treble

15K

39K

10K

470K

3.

3K

15K

10

meg,

10%

33K

27K

3.3K

5.

6K

100K Vari

able

-Dual

Front/R

ear Bal.

100K

Variable•

L/R

Fr

ont

Balonce

100K Variable•

L/R

Re

ar Balance

100K

82K

10K

470

ohm

10K

1K

10K

3.

3K,

1/2W,

10%

820

ohm

270 ohm

~

~~:

Variuble - Bias

Adjust

\Dohm

3.3K,

1/2

1'1

. 1

0%

150 ohm

2.7 ohm, 1/21'1, 10

""

150

ohm

2.7 ohm, 112W. 1

0:':.

.

24

ohm.

ZW

, w,w

,27

ohm,

.:.v,

W/W

BOTTOM

FOIL

-----------------------7

----

G

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- -

~-

-

---rll'-

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..

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tr:"

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SCHEMATIC

DIAGRAM

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SYLVA~IA

TYPE

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PART

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(ALL

NUMIER

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13-343157-3

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.

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1S-3435-1. l'NI' ·

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·

FM

Otcillator.

13-34371~1-

NPN

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01110· l're

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13-34375-1

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13-3431&-1

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13-34381'1

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100-360

100-350

90-270

N/A

20CMOO

5eOOMIN,

30MIN,

90-270

80-200

10-150

SEE

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20MIN.

90-270

N/A

225-450

50-150

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3V

110mW

32V

4V

200mW

11V

4V

200mW

46V

4V

·.

IOOmW

45V

4V

500mW

30V

200mw

411V

4V

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10V

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70V

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700mW

12V

3V

250mW

40V

4V

2.1W

50V

4V

300mW

-

20V

B5V

N/A

110V

4V

500mW

NIA

25V

200mW

20V

10V

250mW

30V

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ID

U.

1uA

1,2,3

.29uA

3,4

,211uA

3,4

100nA

4,11,

11

100nA

4,11

N/A

7,8

.09uA

3,4

100nA

3.4

.

""A

9

•.

•

N/A

11

: 10, 11, 12

N/A

I,

10,

11

, 12

100nA

3

100JA 13

10uA

3,4.

14

100nA 1

100nA

4,

10

N/A

7,

11

N/A

7, 15

.26uA

3,4

100nA

3,4

; "

!~-:'

_,

·.

~-

,.

.•

BROWN

DDT

_. 100-160.

·RED DOT

..

160-210

ORANGE

DOT

200-260

YELLOW

DOT ·: · 250-310 0

~

Q 8 <'.---)

E 8 C

GREEN

.

OOT

_ · :

...

~

300-300

1 2 3 4 6

lJ

8

B C E

~

PLANE

9

e,

10

E B C

l•••I

SEATINg,/

PLANE

12

w

16

--

CABINET

PARTS

LIST

R04747

--

SERVICE

DESCRIPTION

PART

NO

.

DESCRIPTION

FM

Anitnn1

27-14926-2

Pushbutton

Gu

l

de

- 2 Button

Pushbu1ton

Guide

•6 Button

BEZEL

Spted

Clip•

Dial

Bezel

to

Escutcheon

Cowr

GI•

74-34762-1

Speed

Clip • Gleu to

Bezel

Dial

74-34928-1

Tuner

Knob•

Balance

Control

74-34859-1

. Knob•

B•

.

Treble

(lnlllf'Shift)

74-34862·1

CABINET

Knob·

81&1,

Trtbll

(Outer

Shah)

74-34863-1

End

Cap· Left Hind

Knob•

Top

Mitch

74-34797-1

End

Cap· Right

Hend

Knob-

Tuning

74

-

34861-2

Non-Sk

id

Pad,

Cabinet

Bottom

..Knob·

Volume

74-34861-1

Vent

-

Cabinet

Bottom

Nut

•

Halphont

.llek Mollntillg

70-32649

-1

Vent

-

Cabinet

Top

''Ulflblltton · ··

74-34913-1

-

12-

·•

SERVICE

PART

NO.

74.34929

.2

74-34929-1

70-34933-1

70-26679-1

74-34763-5

74-36448-2

-

--

74-38441

&i,2111N

,~.,.,.,

74-34771-1

SUPP,

2

TO

~74~

.

CD4PANEL--

CAPACITORS

-13-

-

C182

~~

=---C154

~

~~~

~~=-

-.i-C152

-

-~

C1198

·.

~~l-

e2•

-·

~ (

C248

-.-;.

C21M

<-;_

C278

C244

C264

C227

C224

C284

C260

C282

,,,_

---C258

C220

C256

254

C252

"1'14

C250

~

,

j)

' ~ -

:as

C262

. - ~

~

/ .r

•3:

°1

n: x ·

• - I

r

---

CD4 PANEL

-

..

~

~,

\

.! .

..

.

t

''.

..

~.

·:

I

.·

'.)

.

~

·~

.

\,f

,'

{

··1···

~

.

r

i ..

J ·,

't.~·

..

t

h,

(

',

~

'.

· ' l

. .. p /

~

\

:J

·• ,

.,

, .~

~

f ) '

:v,: \

/':

..-

~-,.

;•~

r_..

·.

,; · "·~ l

··

1,

. -

~

'

,.J:.-

:

I;!'

i

<?

.J'

'

-J

~

""

-

C

:t

~

!4

t

~t

~

tlll

+L

...

-

U<

-

SCHEMATIC

DIAQr.

. '

cooER)~

riAlltf

(CO,

oE

-=

·

-=--=--=--=-

··

-:_-:_-:_-_-_1----,---i

MU

1111

·

~------------l11:!<101=:---,._+------.•,oo---+-•~'"'.,ca,

t.n

h;

~ll

IOOlc

rJ:4

♦

Y!

un

"2,..--,CM.

UIOUT

T0U1TCH,

K"IUTKMI

CONTIIOl

uoo

t.H

Clll

.

ii.

11201

LZ<

UM

Ql4

INZ

J.

)I.

.47 !<IV 11«

IUOI

IIIIIHT

Qt

IN,UT

.17.

cuo

-·

LIOI

,...,

~I~

lU

♦

t.

n:

------------------

TOC04

IND.

L.t.11,

+

CIN

.~

CH4

.

m

IIZH

fflt

-18-

,

...

L

...

"2H

47K

S\Jl'P. 2 TO R74-3

~

vn-

.

~

10 R7

4-3

SCHEMATIC

SERVICE

~

fi~EMENT

PARTS

LIST

(CD4 PANELi -

COOING

p

ART

NO

. -

DEICRIPTION

CAPACITORS (All

nlu.

in

MFD . .

c102

'uni"'

otti_,,.

apeclfled)

C104

41

-3

2477

-46

ll/2tSV

Electrolytic

Cl<)8

.0047.

IIIOV

C108

.0068

Cl

10

40-l028S-60

390PF

Polvnvren•

Cll2

.01.

1110V

C114

40-IQ28S.6S

1200PF

Polyatyrene

C116

6600PF

C118

41

-3

2477

~6

6/26V

ElectTOlytlc

CIIII

41

-3

2477

-38

2II0/16V

ElectTOlytlc

C120

,01.

100V

C122

3300PF

C124

2200PF

C126

680PF,Z6P

C127

41

-3

2477

-34

25/16V

Electrolytic

C128

220PF

Cl30

41

-3

24

?7-38

250/16V

Electrolyt

ic

C1

38

3300PF

_ .

C142

lOOOP~

C144

3

300PF

C146

41-34346-2

.22f25V

ElectrOlytlc

C148

:.-::!..

48

B8/35V

Electrelytic

C150

41

-3

2477

-46 .oon.

5"-Polyatyrene

C

152

5/25V

Electr0lytlc

C154

-

2200PF

ClS6

.

Cl-39l48-84

.47/SOV

Elecmilytlc

C168

41-39148-&4

4~v

Elec,trolytic

C160

.01

.

Z5U

C182

47PF

C164

.0082

C186

.0068

C168

40-10285-50

390PF

Potvnvr-

C170

.01,

150V

C172

40-10285-65

1200PF

Polynyr-

C174

6600l'F

C176

41-324n-48

5/25V

ElectrOlytic

cne

.01.zsu

C180

41-324n-46

5/25V

Elec:trolytlc

C182

41-324n-46

5/25V

Electn'.llvtlc

C184

41-324n-46

5/25V

Eiec;trolytic

C188

41-32477-38

250115V

Electrolytic

C202

41-324n-46

5/25V

E1ec:trolytic

C204 ·

.0047.

150V

c:zoe

.

0068

C208

40-10285-60

390PF

PotvatY,_

C210

.DI.

150V

C212

40-10285-66

1200PF

Potynyrene

C214

5600PF

C218

4142477-48

5125V

Electrolytic

C2111

41

9Ml

l~

ffOl15V-£~

e2111 .01.1oov

C220

3300PF

-c:222

2200PF

C224

680PF,Z5P

C226

41-32477-34

25/16V

Electrolytic

C227

220f'F

C228

41-32477-38

250/15V

Electrolytic

C230

3300PF

C238

toooPF

C242

3300PF

C244

41-34346-2

.22/25V

Electrolytic

C246

41-39324-149

.SS/35V

Electrolytic

C248

40

·

10286-44

.0027,

5"

•

Polystyrene

C250

41-32477-46

5/25\/

Electrolytic

C2!52

2200P

F

C:254 41-

39148-&4

.A7/50V

Electrolytic

C256

41 •39148-&4 .A7/50V

Electrolytic

C258

47PF

c:zeo

.01,

Z6U

C2tl2

47PF

C264 ,0082

C2&II

.0068

C288

40

.

10285-50

390PF

Polystyrene

C270

.

01.

150V

SCHEMATIC

COOING

a!RVICE

~

OESCRIP1'~

CAPACITORS

(CONTINUED)

C272

40-10285-55 120(ll'F

Polv11vr

en•

C274

!5600f'

F

C276

41

-3

2477-46 6/25V

E1ectro1v11c

C278

.01

, Z6U

C282

41-32477-48

6/'Zf>V

El,ctr0IY1IC

C284

41-32477-46

5/'lfN

Electrolvtlc

ill

,pedflldl

RESISTORS

(All 1/4W, Carbon.

5~

unlest othlrW . ·

R101

R102

R104

R106

RIOS

R110

R112

Rl14

R118

R120

R122

R124

R125

R127

.

R128

R129

R132

R134

R136

R138

R140

R142

R144

R146

R148

RISO

R152

R156

R158

RIIIO

R152

R164

R166

R168

R201

R202

R204

R206

"

R208

R210

R212

R214

R216

R218

R220

R222

R224

R226

R227

R228

R229

R232

R234

R236

R238

R240

R242

R244

R246

R248

R250

R262

R256

R268

-19·

470K

47K

18K

2.

2K

2.2K

lmeG

12K

100K

1110

ohm

330ohm

100K

47K

10K

2.7K

100

ohm

220ohm

1.5K

37

-

14576-16

: :

~~

Veriablt · V,C.0,

Adjust

8.2K

3.3K

100K

15K

100K

22K

3.6K

2.2K

330 ohm

100K

150K

2.7K

47K

470K

47K

18K

2.2K

2.2K .

1-mlll

12K

100K

180ohm

330ohm

1001<

47K

10K

2,71(

100ohm

220ohm

1.5K

6.8K

37-14576-16 4,

71(

Var

iable• V.C.0. Adjull

8.2K

3.

3K

100K

15K

16K

100K

22K

3.

6K

2.2K

2.

21(

330ohm

. PANELi (

CONTINUED)

-

--

RE

PLAC

EMENT PARTS LIST (C04

SCHE

...,.TIC

SERVICE

oUCfl

ll'1'1

~

CODING ~ T NO, -

RESISTORS 1

coNT

IN

UEDI

7,7

11'.

R264

R266

R

2'111

SOLID

STATE D

EVI

CES

IC100

IC200

SC1

02

SC202

COILS

L1

02

L1

04

L106

L1

08

L114

L116

L118

L.202

L204

LZ>6

_

L..208

L214

L216

L218

1&-:1

6647-1

16-3

6647

-1

72..J668&-1

13-175

96

•2

13-1759&-2

.MISC

EL

LANE

OUS

PARTS

SK100

SK102

SK

104

51(,207

SK204

73-366

79-5

73-36679-3

73,-36679-3

7

3-366

79-3

73

-366

79-3

72-3

5686-

1

47!(

47K

L

of

t Ct,an

f\

•1

~

...

R

i9h

t c1>enn•I

....--

28

pi

r>

IC

soc

ket

ol<)de

oiode

32

MH •

p.djustebl•

73

,Sr.lH .

,4djUI~

100MH

10M

t-f

1oM

t-f

3

2',!H

.

,Adj

u,

toi>

le

23_

5M

H • AdiUStable

3

:zM

H · ,'ldjU1'3ble

23.sMH •

,Ad

justa

bl

•

100MH

10

MH

1

oMH

32M

t-f

• Adjust»t>'•

23

.

SM

H - Ad

iut

"'

ble

eonnec:to< . 5

eo

nn

ect

o<

-

Laft

en-nnel

Inpu

t

c o

nnect

or

. U lt

c.,.,,,..,1

OutPUt

CoM ectO' . Rigllt CM "

,,.,

I

nput

eonn~r

. R

i9'11

CJ\al\l\81OutPUl

5oc

k

11'1

_ ln

,_,.twd

Ci

rcuit

-SPEAK

ER

PROT

ECTION

CIRC

UIT

-

SCHEMATIC

C

ODI

NG

C1

202

C1204

C1206

01202

0

1204

R

1206

R12

08

R1

210

R1212

R1

214

R12

16

R121 8

R1220

RV12

02

SC

1202

SC

1204

SC

12

06

SERVICE

PARTN0

-

41-32477-85

41

-3

2477

-

50

41-32477-85

13-2

6386

..J

13-2

9033

-3

31-3

9947

-2

13-

17596

-10

13,17596-10

13-

17596-10

72-

27

200-6

DESCRIPTION

1M

FO,

50V

El

ectroly

tic

50

MF

O,

25V

Electro

lyt

ic

1

MF

O,

SOV

Electro

lyt

ic

Transis

to

r • Re

l.av

Dr

iver

Transi

sto

r

~

Vo

lt~

Amp

Resistor • 1

OOK

. 1/4W, 5% - C

ar

bon

Resist

or

-

22K

, 1/4W, 5" •

Carbon

RHi

sto

r • 2

20

K,

l/4W

, 5% • Ca

rbon

An

is-t

or •

47K

,

1/4W,

5% •

Carbon

Res

is

tor • 100K,

l/4W

, 5

%.

Carbon

Resist

or•

47K, 1/4W, 5% •

Carbo

n

Resist

or

• 47K, 1/4W, 5% .

Carbon

R

ni

1tor ·

47K

, 1/

4W

, 5

'!1.

•

Carbon

Relay

Di

ode

Di

od

e

Di

ode

Smell 3-9in

Trans

i

stor

Socket

-

20-

J

--

SPEAKER

PROTECTION

PANEL

--

;.' . J

80TTOM

fOll

■

-

SUPP. 2 TO

A'74-3

---PRO

,DUCT

SAFETY

GUIDELINES.

FOR

ALL

PRODUCTS

--

CAUTION:

Do

NOT modify any circuit.

Se"lce

work

should

be perfonned only after

you.,.

thoroughly famllla,

,·

following

Nfety

checks.

Rbk

of

potential

hazards

end

Injury

to

the

user

incre•ae•

If

..

fety check,

•re

not

adhered

to,

With

Ill

Of

U,.

---

SAFETY CHECKS

---

SUBJECT: Fire &

Shock

Huard .. . .

l.

Be

~re

that-~

component,

UC

.

positloned

in such a

way

to

.

avoid

PONibility

of

aborts

to

acijaccnt

components.

Thu

is

especially

important

on

thoac

chu1i1

which

arc

transported

to

and

from

the

repair

ahop.

. . . .

2.

Alway,

replace

all

protectwe

device

■

,uch

u

insulator

■

and

barrier,

after

working

on

a act.

..

.UMFD

AC

type

capacitor,

betwce~

a k

p-ound

(water

pipe,

conduit,

etc.) and the

no"11

!l>Od

part

■,

one

at

a time.

Meuurc

the

AC

v:i~P<>le(l

111

~

combination

1500

ohm

rcmtor

and

,1

5M1'

q~

Reverse

the

AC

plug

on

the

set

and rep

])

capacitoi'

. mcuurcmcnt1 again:

for

each exposed

mct~t

AC

'WI~·

mcuurcd

muat

not

exceed

.!

·

volts

R,M.S,

T~art.

\'01~:

to

0.2

milliamp AC. · •

corr"Polllli

!.

Check

for

damaged

imwatlon

on

wire

■

including

the

AC

cord.

. · · · .

4.

Check

acroa-the-line

component

■

'for damage

and

replace

if

necessary,

- ·

5.

After

re--...embly

·

of

the

act,

alw~y1

perform

an

AC

leabge

test

on

~e

n~acd

metallic.parts

of

the

.

cabinet

~ch

u

the

knob,,

antenna

terminals.

etc.

to

be

sure

the

■

cth

safe

to

.

..

operate

without

danger

of

electrical

shock.

Do

not

uac a

line

isolation

transformer

during

tlµs

teat. Uae

an

AC

Any

value exceeding this

limit

constitu

t

es

aP0tcn .

-

hazard

arid

mu

■

t

be

corrected

immediately,

tialsboq

AC

VOLTMETER

voltmeter

having

5000

obmi

per

volt

or

more

sensitivity

in

good

earth

grou

nd

.

the

following

manner:

· such u

the

water

.

Connect

a

1500

ohm

10

.

watt

remtor,

_paralleled ·

by

·-

,·.. pipe,

co~uit,

etc. :

.. .. ·. -·.:

~

.

1500.n

- ., -

....

-._,._

.....

,ow

·. .

. .,

---INDEX---

CONnNn

~

Parts

lda1tifution

-·Audio Mute Panel

_________________

&

-CD4

Decoder

Panel

13

-

Speaker

Protection

Panel

21

Repla~

Pam

List -Audio Mute

,.

_

..

1 5

-

CD4

Decoder Panel 19

-Cabinet

12

-Main

Amplifl•

2

•Speaker Protection Panel 20

Schem.Cic Diagram • CD4 Decoder 17

-

R74--1

Amplifier 7

-R74 Tuner

10

Tranlistor

Replacement Gulde 12

Printed

in

U.S.

A.

·22-

Place

this

Probt

on

each

'1J>oltd

ltltbllic

P11t

I

GTE SYLVANIA RQ4747 User manual

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