Yamaha R-50 Bedienungsanleitung

STEREO RECEIVER

R-50

I FRONT PANEL

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l* ll "ll * ll I lt:t:iiiiili:iii.iillr.r.rrl

III

I CONTENTS

TOSERVICEPERSONNEL ......1

SPECIFICATIONS. ._....1

REAR PANEL . .. . ......, 2

INTERNALVIEW. ......3

DISASSEMBLYPROCEDURES. ,.. 3

ADJUSTMENTS 4-6

PRINTED CIRCUIT BOARD 7,8

SCHEMATICDIAGRAM ....9

BLOCKDIAGRAM ......9

PARTSLTST. ..10-19

SINCEI8'7 @YAMAHA

NIPPON GAKKI CO., LTD. HAMAMATSU, JAPAN

Printed in Japan 83.3. 2.5k 474 lll@

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aR-5()

I TO SERVICE PERSONNEL

(Pr:epared in accordance with UL Standard

12701

Before service of this appliance by you, please

carefully read this service manual.

Please make Leakage-current or Resistance

measurements by suitable meter to determine 1

that exposed parts are acceptably insulated

from the supply circuit before returning the

appliance to the customer.

A PROBE WITH SHIELDED LEAD.

B SEPARATED AND USED AS CLIP WHEN

MEASURING CURRENTS FROM ONE

PART OF APPLIANCE TO ANOTHER.

Confirm that the leakage current is not more

than 0.5mA AC.

I SPECIFICATIONS

Phono O.42mV

Aux,Tape 20mV

Maximum lnput Signal

l kHz 0.01% THD Phono 85mV

Output Level/lmpedance

Rec Out 120mV/1ko

0.015% THD o59v1220a

Phono (lV) 0.015%

LEAKAGE CURRENT MEASUREMENT ClRCUITS

GROUND

Appliance intended for connection to a 1 20 volt power supply.

30dB Ouietinq 75rl 0.8lrv (9.3dBf)

Usable Sonsitivity (DlN)

Mono (S/N 26dB) o.8pv (9.3dBfl (G)(B)(A)

85dB

Mono SOdB (G}(B)(A)

Stereo 76dB (G)(B)(A)

Mono tkHz o.1%

nal to

Mono

Stereo lkHz 0.15%

Harmonic Distortion l4OkHz Devl

Stereo lkHz 0.15% (G)

lkHz 4OdB

30Hz to 15kHz -1.5""

Frequenry Response

20Hz to 100kHz Aux, Tape -3dB

RIAA Equalization Deviation

Phono lo.sdB

Total Harmonic Distortion 513 to 1620kHz (G)(A)(B)

510 to 1620kHz or

Aux, Tape to SP Out 1W8o 0.008%

t ntermodulation Distortion

US & Canadian Models

General Model

European Model

120V AC,60Hz

110 - 120V ACl220 -

240V AC,50/60H2

22OV AC, SOHZ

Bass boost/cut

Treble boost/cut tlOdB (at 50Hz)

tlodB (at 2okHzl

British & Australian Models 240V AC,50Hz

Power Consumption 180W (U)(C)

100w (R)

(Ul ..... U.S.A. model

(A) ..... Australian model

(G) ..... European model

(Bl ..... British model

(Bl ..... General model

Specifications subject to change without notice.

Attenuation -20d8 (at lkHz)

FM 10O%mod lkHz

FM 40kHz mod 500mV/5ko

380mv/5ko (G)

Mono 1.6pV (15.3d8f)

stereo 22sV (38.1dBfl

o.8pv (9.3dBfl (G)(B)(A)

852 1.8d8

0.02%THD 17.5W8r}

2.5mYl47k{t 80dB (G)(B)(A)

to (SmV lnput Shorted) 88dB/80dB (G)

Aux, Tape 5.1kO Shorted lkHz 60dB

Tone Control CharactotistiG

Switched 200W max.

Unswitched 200W max.

7-118x4x1

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R-5()

I REAR PANEL

v U.S.A. & Canadian modets

v General model

v British & Australian models

v European model

ATTEilTloi:milo

[o t20 eeo aao vcE

lmwAre solaoHz^,

rpto c fir co,uD. @

+@- -O+

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r INTERNAT VIEW

@Removing Top Cover. . . .

@Removing Front Panel . . .

@Removing Bottom Cover

r DISASSEMBLY PR.OCEDURES (Remove parts in order of disassembty as numbered.)

* Replacement of the parts of almost circuit boards in this unit is possible by removing the top and bottom cover.

R-5(,

Q eowen TRANsFoRMER

U.S.A. & Canadian models: cA66400

European model: GA66410

Australian & British models: GA66420

General model: GA66430

O ELEcrRoLYTrc cAP.: 68oopF 46V

@otooe BRTDGE: s4vB2o or RB4O2or 4D4841

@eu roor ANTENNA

@rnorur END PAcK

@ tr tC: ttPC577H E,Fl

@eowen swrrcH

@nowen tc: STK-4873

@unrru ctRcutr BoARD (1)

@uex lc: LA338o

@urcno coNPUTER rc: LC65o2c-604

@rururruc coNTRoLLER tc: LC721o

Cup Screw 4x8 FNM3-3g

Binding Head Tapping

Screw 3xB FCRM3-B[

Binding Head Tapping @ Removing Heat Sink . . . . Binding Head Tapping

Screw 3x8 FCBM3-BQ Screw 3x8 FCM3-BI

" r-o"r. p

WPipe Fixture

Block Heat Sink

Fig. 1Fig.2

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I ADJUSTMENTS

Before adjustment

Note 1: After the power switch is pushed on, wait for 5 minutes before measuring, to be sure of the most stable operation.

Step Confirmation Test point Rating or standard Adjustment method Rimark

1Power supply voltage

+B-E

_B-E

+20-E

+12-E

+9-E

-9-E

+5.6 - E

FB-E

AB-E

+36V t 5V

-36V tsv

+20v t2v

+12.5V t lV

+9.5V +O.sV

-8.9V t0.5V

+5.6V t0.5V

At FM reception mode'

+12V t 1V

At AM reception mode

less than +1V

At FM reception mode

less than +1 V

At AM reception mode

+12V + lV

Make sure that AC line voltage

comes within

Models AC line voltase

u-c 120V t 10%

G?/i20v L,10%

A,B 240V + 10% No load

2DC offset Speaker terminal

or pin 5 ol 1C112

(L ch) and Pin 12

(R ch) OV t50mV

\-/

oBefore adjustment

Note 1) After the Power switch is pushed on,wait for 5

minutes before measuring, to be sure of the

most stable operation.

Note 2) Adjust the OSC coil and IFT with a nonferrous

screw driver.

Note 3) Do not forget to keep the bottom cover on.

1. FM TUNER SECTION

oUse 200H2 to lskHz bandpass filter to measure the

REC OUT.

.On step 1 and 2 connect the auxiliary center meter

(J|0OO36 or similar) in series with the resistor 1OkO

between TPI (S OUT) and TP2 (NVcc).

Auxiliary center meter

o Measu ring inslruments abbreviation

FM SG

SSG

AM SG

OSC

DIST. M

ACVM

FM signal generator

Stereo signal generator

AM signal generator

Oscilloscope

Distortion meter

Frequency counter

AC volt meter

oSet the switches to the following positions.

INPUT .... TUNER

BandSelect .. FM

TUNING/MODE ... AUTO

VOLUME . . Min

Step Adiustment item Connection

terminal tnstrument required Adiustment

locations Adiustment method Rating or

standard Bemarks

1Detuned noise

confirmation T101

(ST DIST} Adjust noise level to

maximum at detuned

point.

2Discriminator

balance adjust-

ment

TPl -TP2

(S out)(NVcc) Auxiliary center

meter T102

(DISCRI

CENTER}

Adjust so that the

pointer of the auxil-

iary center meter points

to 0 at detuned point.

3station center set

confirmation 300s} FM

ANT

TP1 -TP2

(S out) (NVcc)

FM SG

[gguH, t tttt, I

lzoosrr (75.2dBr) |

IMONO lkHz I

[roox uoo ]

Auxiliary center

meter

TUNING SW

+UP or DOWI Confirm that the auxil-

iary center meter

deflects to 0 at tuned

the signal of FM SG

4Monaural distor-

tion adiustment 300r} FM

ANT

REC OUT

(TP7, TP8}

FM SG

[98MHz t 1t<Hz I

lzoaep l75.2dBtl I

I monaural 1 OOHz orl

L+oon' 1oo% MoD_.j

DIST. M. OSC

BPF

vc101

(MONO DIST) Reduce distortion to

minimum Less than

-64d8 Confirm that

all signal O

indicators

lisht

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Adiustment

locations

VB102

(vco)

Stereo indica'

tor

Adiustment method Rating or

standard Bemarks

Step Adiustment item Connection

terminal tnstrument required O Connect resistor

2.2Mo between TPs

(i9M) and 1p6 (+12)

and force the set in

stereo mode.

@ Adiust so that VCo

frequency is at lgkHz

19kHz I

lOHz Confirm that

stereo indi-

cator lights

up.

After adlust-

ing, remove

the FC and

2.2MA

resistor.

5VCO adiustment 300s, FM

ANT

TPs -TP6

11gtvl) (+12)

TP3 - TP4

(19kHz) (G)

FM SG

fgSMHzttt<Hz I

I zoasp (7s.2dBf) I

I Unmodulated -l

hesistor 2.2Mo

T101

(ST DIST) Less than

-48dB

G model

only Less

than -35dB

Not adiust

T101 , when it

is within

specifications.

6Stereo distortion

confirmation 300s, FM

ANT

REC OUT

(TP7, TP8)

FM SG, SSG

'98MHz t lkHz I

70dBp (75.2d8f) I

STEREO L, R I

1kHz, 100% MOD.I

Dtsr- M, OSC

BPF Confirm that the leak-

age level of the

opposite channel is

minimum

Less than

26dB

7Separation confir-

mation 300s) FM

ANT

REC OUT

(TP7. TP8)

FM SG, SSG

lsst\rHi f ttl'{z I

I zoaer, (7s.2dBf) |

I STEBEO L or R I

I rtnz, toox rrltoo-l

bsc, acvNlt, ePr

3000 FM

ANT

REC OUT

(TP7, TP8)

FM SG. SSG

lg8MHz t 1t<Hz I

I zoaep (75.2d8f) I

Lprlor 9% MoD -l

osc

ni.annnant RPF

VRl01

(PILOT

CANCEL}

Observe waveform on

the OSC and adjust so

that carrier leakage

le\rel reduced to

minlmum

More than

34dB

IPilot cancel

adlustment

Confirm that the

auxiliary center meter

points to 0 at tuned the

signal of FM SG

lf it is not

points to 0,

start allover

from step 2.

IDiscriminator

balance confirma'

tion .

Tfi -TP2

(S out)(NVcc)

300s, FM

ANT

Auxiliary cente meter

FM SG

l-98MHz i lkHz I

l-roac, t-15-2dBfll VR103

(FM FINE) By shorting TEST

terminals, the counter

shifts by one digit, then

adiust so that the

lowest effective digit

comes to I or 0.

r-This figure

I -8O.O

g8.0MHz-1*79 E

When shifting

After adiust-

ing, open the

TEST termi-

nals.

10 lf offset adiust'

ment 300a FM

ANT

TEST termi-

nals

(K4, T6)

FM SG

[98MHztlkHz I

[zoaeu (75.2d8f) -]

Short

TUNING SW

+UP or

DOWN

Confirm that auto

search recePtion is

possible with the tun'

ing button.

Confirm

that muting

is performed

at auto recep-

tion.

11 Auto search

reception confir-

mation

3000 FM

ANT FM SG

[9BMHz t t tHz

lzoaar l25.2dBtl

I ruoNo t tgz

Irooga moo

2. AM TUNER SECTION

oConnect the AM dummy antenna for adiustment' oWhen once the test terminals are shorted in adjusting

FfU, tt',. frequency of 630kHz, 1440kHz' -and 1080

tH, it memo;ied at each AM preset position 1' 2 and 3'

Adlustmenl

locations

PRESET

Adiustment maftod Rating.or

$andard Remarks

Step Adjustment item Connection

terminal lnstrument required

Confirm the maximum

sensitivitY less than

55dB,r

1SensitivitY confir'

mation AM ANT

BEC OUT

(TP7, TP8) DST. M

ACVM

AM dummY antenna

AM SG

l-1O8OkHz t 0.1 kHzl

fsoaar ]PRESET

Signal O

Confirm that all signal

O indicators light. Confirm that

all signal O

indicators

goes out at

detuned

point.

2Sign'al O indica'

tor confirmation AM ANT

TUNING SW

+UP or

DOWN

Confirm that auto

search recePtion is

possible with the

tunning button.

3Auto search

rqception confir'

mation

AM ANT AM dummY antenna

AM SG

[1 oSokHz i 0.1 kHz I

[ooaar ]

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3. DIGITAL CONTROL SECTION

.TEST POINT

Step Adiu3tmont itom Connection

terminal !nstrument required Adjustment

locations Adiustmont method Rating ot

standard Remarks

IPreset memory

confirmation 3000 FM

ANT

AM ANT

FM SG

[98MHz i lkHz I

lzoaep 7s.2dBtl I

luoruo trxz I

Lroox rvroo I

AM dummy antenna

AM SG

[ro8orxz io.lkHzl

lsodep I

L+ooxz,30% MoD l

FM/AM SW

TUNIT{G SW

MEMOBY SW

PHESET SW

O Memoring the PRE-

SET Pl at FM SG

frequency.

@ Memoring the PRE-

SET P2 at AM SG

frequency.

@ Confirm that the fre-

quency memorized is

recalled.

O Press the FM button and

tuned the 98MHz with

AUTO seach

Press the Memory

button.

The Memory indicator

lights about 3 seconds

Press the PRESET Pl

during the Memory

indicator lights.

.l.

The PRESET LED of

Pl lights.

@ Press the AM button and

tuned the 1080kHz with

AUTO seach.

Press the Memory button

.1.

The Memory indicator

lights and the PBESET

LED of Pl flash6s.

PrCSS thE PRESET P2

.1.

The Memory indicator

goes out and the PRE-

SET LED of P2 lights.

2Last channel

memory confir-

mation

POWER SW O Press the PRESET Pl

@ Turn the power

switch off.

@ After about 5

seconds, turn the power

switch on.

@ Confirm that the

PRESET Fl memorized

is recalled.

@ tnepRg-

SETof Pl dbe:

not lights

lel ffifll

!h ,[3. --srDsr

(-) ffira

n Q_-r,",0.-.., ,ffi]]

tl qssB/ffi _ 8Hffl;''"

E C$3 l-rcr.4 1 R2o4

t/r ==fu

l-#',",,,1118 ltsJJD-m

iffii''i vEi6zr^'* mi

-&-&- vco ','6tr#

g*3

*[H " "Q"

I ,"'os I r;l

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From MAIN C.BOARO('/6)

BOAR.D (Pomern side)

I PRINTED CIRCUIT

oKey circuit board

oMain circuit board 1216 - 6/6)

To MAIN C.BOARD(116,

To MAIN C"8OAR0{l/6)

.7a F.an MAIN C.BOARD(l/6)

Main C. Board

(5/61

To MAIN C

Main C. Board

(6/6)

From

From MAIN C.BOAR0(l/6)

From i/tAlN C. BOAfrO t ll5)

TUN_UI|_G- TUNING

/MODEMEMORY FMAM DOWN

To MAIN C.$0ARS(llS)

Tq MAIN C.B0ARD(l/61

From i,lAlN C. BOARD(116)

Frorn MAIN C.BOARD

il/6)

L.'

i", r,

-o

o.3

-. !r'

vc,

<tE

IL {

)

Main C. Board

14l6l

Main C. Board

l2l6l

SPEAKERS

oFFI OFF

ON- ON 7

SPEAKERS

Fr*m MAIN C.B0ARD{l16)

To MAIN C.B0ARDt316l

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R-5(,

PARTS LIST

r ELECTRICAL PAR.TS

TWARNING

UL Standard 1270 requires'that components marked A be

replaced with parts having specifications equal to those

originally installed.

. Carbon resistors of this receiver are YrW.

There is no discription about them in this parts list.

Use the "Part No." HJ35OOOOoT equivalent.

Ref.

No. Part No. Description \sff€ Remarks Common

Model Markets

,,t L#. . ':.'j.--'.1

lT:*::T--

ffi

lfirt:?y,1"!{€]*i:*ll

ffi

{i:i::ir$a:ii:llia{i!Mi

ar:tir!:ifir*:!.li:i 3

?f&f$:!".i1xt]}i*

i,r*l;iri$;*i:*.

8n'{ffi{fi*tf

u:k. r:b r-:l ;. - '

:ta.*&;:{:lt :a:tii,a

fll'l1t:riy35*xi;iri

I,-'.'r ".:;

ffii

l .i-" 'i;1

msps$$s

[&tr*sE

Kt]rix;'*i

q*1!-tffi**

iill*]ri:|l;:;:ii:l

i*{***rl

ff**:]ix

re ;

"1":';*{{.*'..1: l

rffiffi

' "lt- '.

FG 4r3 !90 Ceramic Cao 39pF 50v e. 2Ic249,250

FG 4170 47oF sOV c221,222

FG 421 iOO IOOpF 5OV c 199.200 G

FG 4 22120 22Oot 50v c1 91,1 92 G

FG I4 22 20 22OpF 50v cl49.190.241 .242

FG 423 :30 33OoF sOV c1 93-' 1 96 G

G425 60 56OpF 50v c217.214

FG :4 31 rOO 1 OOOoF 50v c108,168

G731 i80 18O0oF sOV c239,240,251,252

FG I4 34 70 47OOoF 50v c287 -290 G

G44i4 oo o.o1 ,,F 50v cr 05,r 06,r 57,r 67,1 69,r 71,1 84,

20s 2to 263

FG i4414 o0 o.o1!F 50v c219,24O G

G44t 420 o.o22,,F 50V c281 -286 G

FG i44144 70 o.o47 uF sOV c237,234,259-262

G t44 42i20 o.o22pF sOV c215.216.264.265

FH 241 ioo o.o!rF soov c1 86

120 22pF sOV cl76.177

I19:21 ioo 1 OOpF 50v cro9,r 10

:G 21i31ioo IOOOpF sOV c143,1 52,1 60

FG 121i24i70 47OpF 50v c1 53

FG 21 134:70 47OOpF 5OV cl14,117,114

22i 41 iOO O.Ol rF 25V c I 02- 1 04.1 3 I.1 34- 1 37.144.

la5 r6t r69 r8! 2rt

I22i41 iOO o.olrF 25V c1 55 G

I22 42120 o.o22uF 25V R,U,A,C,B

I22 42i20 o.o22pF 25V c127 ,134,140,245,246

S25 26i80 Semi Conductive Ceramic Cap. 68OpF 50v sAIc126

U35 70 Mica Cap. 27pF SOOV v.{ ,1 lc170

FZ 00i35 80 Electrolytic Cap 4TOOOIF 5.5v ,:c1 73

zo0 390 Ceramic Cap. 0.1!F 25Y E7I c233,234

FZ OO: 39 i 40 Electrolytic Cap 68OO/F 50v tfc266,267

uA i2s 241 70 Mylar Cap. 47OpF sOV c1 15,1 16 A,G,B

UA 25 26i80 68OpF 50v R.U,C

UA 25 26 80 68OpF 50v c123 R,U,A,C,B

UA 25i3 oo IOOOpF sOV G

UA 25 3 oo IOOOpF sOV c121,122

UA 2513 50 lsOOpF sOV c112

UA 25 4 oo o.o14F sOV c1 29,1 30

UA 25i4 50 o.o1srF sOV c1 50

UA 25 460 o.016,,F 50V c203,204

UA 25i 480 o.ol8!F 5ov c223-226

UA 251 44i 70 o.o47 pF sOV c151.162

UA 25i45 60 0.o56!F 50V c201,202

UW 91 i 73:30 Electrolytic Cap 33!F 6.3V ,fc279

UW 91 i74i70 47pF 6.3V c141,142

UW 91 i81 !OO IOOIF 6.3V c1 58,1 97,1 98

x New Parts (trffiEBe)

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