Yamaha R-50 User manual

--
STEREO RECEIVER
R-50
I FRONT PANEL
r--i---T-----=.;=-r--;---lF;;r: l l'!|!rE!GllE.
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
(C) ..... Canadian 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)
1
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
r@
[o t20 eeo aao vcE
lmwAre solaoHz^,
rpto c fir co,uD. @
+@- -O+
@o
2
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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
g
@
" r-o"r. p
WPipe Fixture
3
Block Heat Sink
Fig. 1Fig.2
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I ADJUSTMENTS
<CONFIRMATTON OF AUDIO SECTION>
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
\l
\-/
<TUNER ADJUSTMENT>
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
FC
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
4
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
FC
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
J
J
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'
J
Adlustmenl
locations
PRESET
P1
P2
P3
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
P3
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
6
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
J
Press the Memory
button.
.f
The Memory indicator
lights about 3 seconds
J
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.
T
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;''"
w
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)
I
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.$0ARS(llS)
MA
Tq MAIN C.B0ARD(l/61
From i,lAlN C. BOARD(116)
Frorn MAIN C.BOARD
il/6)
3
c'
g
L.'
i", r,
-o
Jc
3c
o.3
-. !r'
vc,
<tE
i,
Eu
8a
IL {
0q
)
Main C. Board
14l6l
Main C. Board
l2l6l
SPEAKERS
AB
oFFI OFF
ON- ON 7
SPEAKERS
Fr*m MAIN C.B0ARD{l16)
To MAIN C.B0ARDt316l
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R-5(,
PARTS LIST
r ELECTRICAL PAR.TS
TWARNING
UL Standard 1270 requires'that components marked A be
replaced with parts having specifications equal to those
originally installed.
. Carbon resistors of this receiver are YrW.
There is no discription about them in this parts list.
Use the "Part No." HJ35OOOOoT equivalent.
Ref.
No. Part No. Description \sff€ Remarks Common
Model Markets
,,t L#. . ':.'j.--'.1
lT:*::T--
ffi
lfirt:?y,1"!{€]*i:*ll
ffi
{i:i::ir$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)
ro
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