Kenwood KA-2050R User manual

STEREO INTEGRATED AMPLIFIER KENWOOD
KA-2050R/3050R
SERVICE MANUAL ©1992-6 PRINTED IN JAPAN
B51 -4546-00 (S) 2349
(KA-2050R)
Panel ass'y
(A60-021 9-02)
Knob
(K29-4384-04)
Metallic cabinet
(A01 -2932-02)
Knob
(K29-4384-04)
Phone jack
(El 1-0208-05)
Knob
(K29-4382-04)
Foot
(J02-1 034-05)
Knob
(K29-4215-04)
AC power cord*
Phono jack
(El
Phono jack Miniature phone jack
Phono jack
(El 3-0634-05)
Screw terminal board Power cord bushing
(E70-0018-05): E, X, M, P,T (J42-0083-05)
(E70-001 9-05): L
outlet*
C&3-)
Slide switch
(S3 1-2322-05)

KA-2050R/3050R
Panel ass'y
(A60-021 7-02)
Knob
(K29-4384-04)
Metallic cabinet
(A01 -2932-02)
Knob
(K29-4384-04)
Phone jack
(El 1-0208-05)
Knob
(K29-4382-04)
Foot
(J02-1 034-05)
Knob
(K29-421 5-04)
Knob Phono jack
(K29-4385-04) (El 3-0634-05)
Screw terminal board
(E70-0018-05): E, X, M, P
(E70-001 9-05): L
Power cord bushing
(J42-0083-05)
Slide switch
AC outlet*
(E03-)
(S31 -2322-05)
*Refer to parts list on page 17.
Accessories
•Remote control unit .... 1
j
I0(ton: j|:
J1,
1rIff. .
(A70-0597-05)
(A09-0094-08) :Batterry cover
•Batteries (R03/UM-4/
"AAA") 2
•AC plug adaptor 1
(Except for some areas)
For the unit with aEuro-
pean AC plug in areas
other than Europe.
(E03-01 15-05)

KA-2050R/3050R
ADJUSTMENT/REGLAGES/ABGLEICH
ADJUSTMENT
No. ITEM
INPUT
SETTINGS
OUTPUT
SETTINGS
AMPLIFIER
SETTING
ALIGNMENT
POINTS ALIGN FOR FIG.
Unless otherwise specified, set the respective switches as follows:
POKER: ON SPEAKER: BREC OUT: OFF SELECTOR: PHONO
lIDLE CURRENT
Connect aDC
voltmeter across
CPI (L)
CP2 (R)
(X09-)
VOLUME: 0
VRl (L)
VR2 (R)
(X09-)
8.8 mV (a)
REGLAGES
NITEM
REGLAGE DE
L’ ENTREE
REGLAGE DE
LA SORTIE
REGLAGE DE
L‘ AMPLIFICATEUR
POINTS DE
L‘ ALIGNMENT ALIGNER POUR FIG.
Sauf indicat ioncontrai re, r6gler comme suit les commandes respectives:
POWER :0N SPEAKER: BREC OUT: OFF SELECTOR :PHONO
ICOURANT DE
POLARISATION
-
Connecter un
vollmfttre de CC
SUR CPI (G)
CP2 (D)
(X09-)
VOLUME: 0
VRl (G)
VR2 (D)
(X09-)
8.8 mV (a)
ABGLEICH
NR. CENGENSTAND
EINGANGS-
EINSTELLUNG
AUSANG-
E1NSTELLUNG
VORSTARKER-
EINSTELLUNG
ABGLEICHE-
PUNKTE ABGLE1CHEN FUR ABB.
Wenn nicht anders angegeben, die einzeln&n Schalter wie folgt einstellen:
POKER: ON SPEAKER: BREC OUT: OFF SELECTER: PHONO
ILEERLAUFSTROM -
Einen
Gleichspannungs-
messer Uber
CPI (L)
CP2 (R)
anschlieOen.
(X09-)
VOLUME: 0
VRl (L)
VR2 (R)
(X09-)
8.8 mV (a)
(a)
3

2SO2340STX5 2SB1S316TX5 2SO 23-* 0BT *52S01531BTX5
.a riA
j— LO
C0 CBo
I—Lo
tuner rj*
*— RC
i— LO
AUX f-R 0
i- LC+°
r0
L*r: °
SYSTEM CONTROL
AUD 10 UNIT (A/3)
KA-2050R
X09-3601 -02 A/3 (P)
X09-3602-72 A/3 (M. X, T. E)
X09-3602-73 A/3 (L)
KA-3050R
X09-3601 -01 A/3 (P)
X09-3602-70 A/3 (M. X, T. E)
X09— 3602 —71 A/3 (L)
:§
<KA-3OS0RJ
L07-04 90—*5
<K A— 205 0R1
CONTROL UNIT (A/5)
KA-2050R
XI 1-3271 -01 CPI
XI 1-3270-21 (M)
XI 1-3270-71 (X)
XI 1-3270-51 (T)
,XI 1-3272-70 <E. L)
KA-3050R
XI 1-3261 -01 (PJ
XI 1-3260-21 (M)
XI 1-3260-71 (XI
XI 1-3260-51 CTJ
XI 1-3262-70 (E. L)
L07-O492-.S XII E/5
{KA-20S0RJ II
.Ajr2^

BDFHJ
PC BOARD (Component side view)
AUDIO UNIT
SUPPLY
I's;Jj Mini
i2;in 1 1
1
•miff!
1
1
1
m1
1
•-
POWER SUPPLY 111I11
DRIVE AMP
CONT.AMP
V.V. RO-
ll II -5521-
POWER AMP [L
R146 W220
1W
«»»«»• o)><a> «o'o»i
IA|IA| ir>tU>) a>t(0t
5»5* 5>5‘ 5‘5' SlSlSlSlSlX 5>5' 5'5' 5ii' VR CONT
5Refer to the schematic diagram for the values of resistors and capacitors
VOLUME
CONTROL
0
SPEAKERS

LOUDNESS
TAPE2
Refer to the schematic diagram for the values of resistors and capacitors.

OTHER AREAS (M)
AUSTRAL IA(X)
ENGLAND <T| SCAND INAVI A(L) CANADA (P)
EUROPE (E)
OTHER AREAS CM)
AUSTRAL lA(X)
ENGLAND CT) SCAND INAV IA(L) CANADA (P)
EUROPE (E)
XOS—3602-70 X09-3602-71 X09-3601-01 X09-3602-72 XO 9-3602-73XO 9- 3 6 01-0
2
Cl 28. 134
R1 27. 128
R1 67
R181
R1 93. 194
R211,212
F4, 5
A1
NJM456SD
6800*50
0.01
A1
NJM4565D
6800*50
A1
NJM4565D
6800*50
NJM4580D-D NJM4S80D-D
5600*42
0.01
9.1K
470 1
W
3.3K
5600*42
0.01
9.1K
5600*42
NO
820 1W 820 1W 820 1W
NO NO 6A125
V
T1AL250V T1AL2S0V 1A 250V T1 AL250V T1AL250V
5A125V
1A250V
W1 8. 45. 58
75~78
89. 90.1 15
W85. 86
122. 125
X09- 360X—XX Q1 ~4 2SK1 70 (BL .V) D1~30, !
ICl NJM4565D (3050R) Q5~1 02SC 2 8 78(B )57. 63~l
ICl NJM4580D-D (2050R )Q1 1—1 4:2SC 1845 (F .E) D31.32
1C2 LC 7821 N19. 20 58. 59
IC3NJM4580D-D Q15~1
8
2SA992 <F .E) D51
IC4TC 8163N Q21 .22 =2SC 4137 (V .W)
"N Q23 .24 2SC 24 58(Y .GR) D5 2—55
IC5TA840SS 52. 53 or 2SC331 1A<Q
.
R) D60.76
IC6 *PC 7805AH FQ51 2SA1048 <Y. GR)
IC7
or TA7805Sor 2SA1309A(0. R) D61 .62
NJM45650-D Q54 .55 :2SC 2003(L .K)
orHSS 104
A
RBV-602LFA
or D5SBA20F03
S5688B
Q56 .5 9
Q57, 58
060. 62. 63
Q61
UN 4112 o rDT A124E S
UN421 2orDTC 124ES
2SD863 (E .F)
2SB764 <E .F)
D60. 76 =RD5.1JS (B 2)
orHZS5 .1S(B2)
D61 .62 RD7 .5JS (B)
70~74, 85 or HZS7.5S(B2)
D75:RD20 JS (B
)
or HZS20S (B)
XI 1-32XX-XX
02 2SC2003 (L. K)
D231SSI 33orHSS1 04
XI 1-32XX-XX
(MTYPE) XI 1D/5
CANADA p
OTHER AREAS
AUSTRAL IAX~
ENGLAND T
EUROPE. SCANDINAVIA E.L
UNIT Ngg
XI 1-3261 -01
XI 1-3260-21
XI 1-3260-71
XI 1-3260-51
XI 1-3262-70
UNIT N*»C —
XI 1-3271 -01
T1.6AL250V T1 .6A
T1.6AL250V
T16AL250V ~
T1.6AL250V
XI 1-3271 -01 2A250V NO
XI 1—3270 —21 T1AL250V T1AL250V
XI 1—3270 —71 T1AL250V NO
XI 1-3270 —51 T1 AL250V NO
XI 1-3272—70 T1AL250V NO
SIGNAL LINE
GND LINE
+B LINE
-B LINE
KA-2050R/3050F
Y08-4582-70 KENWOOD

zAA
UN4212
2SA1309A
2SC331 1
A
AC
2SK170
HSS104
HSS104A
HZS5.1S
RD5.1JS
S5688B
1SSI 31
1SSI 33
LC7821N
NJM4565D
NJM4565D-D
2SA992
2SB764
2SC1845
2SC2003
2SC2878
2SD863
2SB1 531 BT*5
2SD2340BT*5
DTA124ES
DTC124ES
UN4112
2SA1048
2SC2458
TC9163N
TA8409S
TA7805S
NJM4580D-D
UPD75004CU-1 45
2SC4137 PST529C
DC voltages are as measured with ahigh impedance voltmeter.
Values may vary slightly due to variations between individual
instruments or/and units.
Les tensions c.c. doivent etre mesurees avec un voltmetre ahaute
impedance. Les valeurs peuvent diferer legerement du fait des
variations inherentes aux appareils et aux instruments de mesure
individuels.
Die angegebenen Gleichspannungswerte wurden mit einem
hochohmigen Spannungsmesser gemessen. Dabei schwanken
die MeBwerte aufground von Unterschieden zwischen einzelnen
Instrumenten order Geraten u. U. geringfugig.
CAUSION: For continued safety, replace safety critical
components only with manufacture's recommended parts (refer to
parts list). /K Indicates safety critical components. To reduce the
risk of electric shock, leakage-current or resistance measurements
shall be carried out (exposed parts are acceptably insulated from
the supply circuit) before the appliance is returned to the customer.
KA-2050R/3050R
KENWOOD
Y08-4582-70

KA-2050R/3050R EXPLODED VIEW