Kenwood KR-V55R User manual

KR-V55R
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KENWOOD CORPORATION
SERVICE MANUAL
©1986-6 PRINTED IN JAPAN
B51-3002-00(B)2111
Knob
ass’y
(Button)
Panel
{K29-2001-04)
(A20-4844-02)
Knob (Button) Potentiometer / Metallic cabinet
(K29-2423-04) (R29-5010-05) {A01-1488-01)
KENWOOD
sbencrn CONTen, are
ainots Ganialier Heny Knob (Button) Knob (Button) ;
(A70-0144-05)
{K29-2425-04)
x2
(K27-1647-04)
x2
Knob (Button) Knob (Button) Knob (Button)
(K27-1264-04) x2 (K29-2422-04) (K29-2422-04) x2
Antenna
holder
Phono
jack(2P)
©
=
AC
outlet*
Power
cord
bushing
AC
power
cord*
(J19-0626-12) (E13-0227-05) x3 {E03-) (U42-0083-05) {E30-)
Binding post (GND)
(NO8-0128-35)
Slide switch
($31-2113-05)
Phono jack (2P) Phono jack (1P) Lock terminal board
(E13-0229-05) (E13-0126-05) {E20-0823-05)
Screw terminal board Phono jack (8P) iniphone jack
(E20-0452-05)
(E13-0814-05)
x3
{E11-0164-05)
Miniphone jack
(E11-0152-05)
* Refer to parts list on page 14.

§
DISASSEMBLY FOR REPAIR
KR-V55R |
1 Remove 6 screws retaining the front pannel 1 |
2 Pull the front pannel toward to arrow direction
3 Remove screw retaing the sub-pannel
4 Remove the sub-pannel from hooks carefully 4)

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KR-V55R
4
CIRCUIT DESCRIPTION
Description of components.
AUDIO UNIT (X09-2310-10)}
|__
Components
_|
Application/Function
Operation/Condition/Compatibility
IC1
Phono
EQ
AMP
MM
cartridge
Input
selecting
selector
Phono/CD/TAPE1/TAPE2
Input
selecting
selector
audio
sig.
of
VIDEO
1/2/3
Electronic
Volume
IC5
Buffer
AMP
(Voltage
gain:
16
dB)
1C7,8
‘
Graphic
EQ.
5
freq.
points
Synthetic
Stereo
Buffer
AMP/3
stage
B.P-F.
Picture
sig.
selecting
VIDEO
1/2/3
Buffer
AMP
(audio
sig.)
VIDEO
1/2
(emitter
follower)
Audio
sig.
mute
1
(TAPE
REC)
MUTE-ON
at
047
ON.
Q7,8
Audio
sig.
mute
2
(Electronic
VOL
out)
MUTE-ON
at
Q9
ON.
ag,
10
Audio
sig.
mute
contro!
of
07,8
Q11~14
Power
AMP (1st
diff
AMP)
Q23~26 Power AMN (driver stage)
Q27~30 Power AM (Final stage)
Q31~33 Current limitter
Q15~18 Power AMP (2nd diff AMP)
Q19, 20 Power AMP
(Current mirror configuration in A-class stage)
Q21, 22 Power AMP (Bias)
Q31 (032) detects terminal voltage of emitter resistor CP1 (CP2). When SP
terminal is shorted to ground, Q31 (Q32) becomes to ON and 033 goes to
ON. So that regurator circuit (034, 35) does not function.
|
034,35
Power
supply
to
1st
stage
of
Power
AMP
Q35
works
as
ripple
filter
when
Q34
is
OFF.
|
asses
Re-set
of
IC
11
(—picture
sig.
selecting)
Q36
cuts
VIDEO
3
selecting
signal
to
ICll,
when
POWER
SW
is
ON/OFF.
Q37
;
—30
V
AVR
Display
Q38~40 +14 V AVR
—14VAVR
POWER ON
POWER OFF
+5 V AVR (for microprocessor)
store sig. control (IC2, 3)
_ data sig. control (IC2, 3)
clock sig. control (IC2, 3)
store sig. control (IC4)
store sig. control (IC 4)
— oe i aa a ———.----—
Q57~-59 Relay (KI) control
+5 VAVR Fip
[Status |_aso | a6 | as2
Power ON | on | off __| working |
Power ofr | off | on | of |
Buffer AMP (picture sig. output) VIDEO 1 (emitter follower)
VIDEO 2 (emitter follower)
pe Monitor out emitter follower
Q66, 67 ; Control of picture sig. selecting

\
CIRCUIT DESCRIPTION
TUNER, p-COM UNIT (XO5-3150-10)
Application/Function
Operation/Condition/Compatibility
FM
IF/DET,
AM
MIX/iF/DET
FM
MPX
PLL
synthe
Microprocessor
Components
system control
Microprocessor remote control
FIP driver
Frequency display control
FM IF AMP
TUNE indicating signal
(transistor array)
conv. to display frequency (static display)
AM/FM switching
Prevention of wrong STEREO indicating
Buffer AMP
Ripple filter
|
oe
|
FM
Bewitching
|
oeto
|
kerinpteythe
OT
CO™—OCOC‘C‘*C
[|__
a2
|
Pater
TERE)
|
working
when
STEREO
indicatorightson
CS
Q5 ON when FM TUNE indicator lights on.
(emitter follower)

KR-V55R
ADJUSTMENT
INPUT OUTPUT TUNER ALIGNMENT
No. ITEM SETTINGS SETTINGS SETTINGS POINTS ALIGN FOR FIG,
FM SECTION Unless otherwise specified, the individual switches should be set as following:
SELECTOR: FM MODES STEREO
(A)
DISCRIMINATOR
(1)
98, OMHz
lkHz,#75kHz dev
6OdB(ANT input)
(A)
98. OMH2
1kHz,+75kHz dev
60dB(ANT input)
Connect a DC voltmeter MONO (X05- ie)
between TP8 and TPS, 98, OMHz
MONO (X05-3150)
98, OMHz T3
Repeat alignments 1 and 2 several! times.
Connect a 330k resis-
DISCRIMINATOR
(2)
Minimum distortion.
(A) tor to TP7, Connect (X05-3150)
98, OMHz a frequency counter 98, OMHz VR3 76, OOkH2
0 dev to the resistor via
B0dB(ANT input) an AC voltmeter,
(C)
98, OMHz (X05-3150)
4 DISTORTION 1kHz,#68.25kHz dev (B) 98. OMHz Front end Minimum distortion,
(STEREO) Selector3L or R IFT
Pilot? #6,.75kHz dev
60dB(ANT input)
(C)
98. OMH2
ikHz +68. 25kHz dev
Selector:L or R
Minimums crosstalk.
A compromise adjustment
may be required if left-to-
Pilot: 26.75kHz2 dev right and right-to-left
6OdB(ANT input) separations are unequal,
AM SECTION Keep the loop antenna installed. INPUT SELECTOR: AM
(1) Connect a DC voltmeter 530kHz
Pee we eee wom | ame ee as -
(2) | BAND EDGE Connect a DC voltmeter | 1610kHz (05-3150) |
ee (2) to TP2, (1602kHz) TC1 8,0¥
Repeat alignments (1) and (2) several times.
(D) Maxinus auplitude and
RF ALIGNMENT 600(603)kHz (B) 600kHz (X05-3150) symmetry of the
(1) fot ee mod . (603kHz) L2 oscilloscope display.
Maximum amplitude and
SEPARATION (B) 98, OMHz (X05-3150)
VR4
RF ALIGNMENT agian (B) 1400kHz (X05-3150) symmetry of the
(2) 400Hz»30% mod (1404kHz) TC2 oscilloscope display.
Repeat alignments (3) and (4) several times,
(D) Maximue amplitude and
(5) | IF TRANSFORMER 1000(999)kHz (B) 1000kHz (X05-3150) symmetry of the
400Hz,30% mod (999kHz) Ti oscilloscope display.
AM/FM COMMON SECTION
(A)
TUNE INDICATOR 98, OMHz FM reception | (X05-3150)
THRESHOLD LEVEL 0 dev 98. OMHz VR2 Light
18dB(ANT input)
(D)
(6) | TUNE INDICATOR 1000(999) kHz
THRESHOLD LEVEL! 20 ~ 24dB(ANT input)
AM reception | (X05-3150) :
1000(999)kHz VRi Light
AUDIO SECTION
(E) (X09-2310)
CP1(CP2) VR2 (R)

KR-V55R
REGLAGE
DE
REGLAGE
DU
POINT
DE
eres
LA
SORTIE
TUNER
L*
ALIGNEMENT
ALIGNER
POUR
FIG,
SECTION
MF
Sauf
en
cas
d’indications
spéciales,
régler
chaque
commutateur
comme
suits
SELECTEUR DES ENTRESS: MF _MODE3 STEREO
(A)
DISCRIMINATEUR
98,
OMHz
Relier
un
voltmétre
MONO
(X05-3150)
(1)
1kHz.#75kHz
déy
CC
entre
les
98,
OMHz
T2
6OdB(Entrée ANT) TP8 et TP9,
(A)
98, OMH2
” LkHz, #75kH2
60dB( Entrée
DISCRIMINATEUR
(2)
Distorsion minimnale,
MONO (X05-3150)
(B) 98, OMH2 T3
__Répéter Jes points 1 et 2 plusieurs fois,
Relier une résistance
OSCILLATEUR
(A)
de
330kQ2
&
TP7,
3
CONTROLE
PAR
98,
OMHz
Raccorder
un
compteur
LA
TENSION
0
dév
de
fréquence
a
une
76,
00kH2
60dB(
Entrée
résistance
par
l*intérmediaire
d'un voltmétre CA,
(C)
98, OMHz
DISTORSION
1kHz,#68,25kHz2
dév
(X05-3150)
(STEREO)
Selection3L
ou
R
{B)
98,
OMHz
Téte
HLF.
Distorsion
minimale,
Signal pilote: IFT
#6,75kHz dév
60dB(Entrée ANT)
(C)
98, 0MHz
1kHz,#68,25kHz dév
(X05~-3150)
(B) 98, OMHz VR4
Signal pilote?
60dB(Entrée ANT)
SelectionsL ou R
26, 75kHz dév
SECTION
MA
Laisser
I|'antenne
bouche
MA
installée,
|
SELECTEUR?
AM
(1)
|
BORD
DE
BANDE
Relier
un
voltwétre
530kHz
(X05-8150)
a
(1) CC au TP2, (581kHz) L3 1,5V
(2)
|
BORD
DE
BANDE
Relier
un
voltmetre
1610kHz
(X05-3150)
|
(2) CC au TP2, (1602kHz) TCL 8,0V
Répéter les points (1) et (2) plusieurs fois,
(D) Amplitude et symétrie
(3)
|
ALIGNEMENT
H.T.|.
600(603)kHz
maximale
de
|'affichage
de
(1)
400Hz.30%
mod
(603kHz)
L2
l’oscilloscope.
(D) .
(B)
Diaphonie minimale.
Un compromis de réglage
peut étre nécessaire si
les séparation de gauche a
droite et droite a
gauche sont inéglage.
SEPARATION
Amplitude et symétrie
1400kHz (X05-3150) maximale de l’affichage de
(1404kHz) TC2 loscilloscope.
Répéter les points (3) et (4) plusieurs fois,
(D) Awplitude et symétrie
(5)
|
TRANSFORMATEUR
1000(999)
kHz
(B)
1000kHz
(X05-3150)
waximale
de
|’affichage
de
F.I,
400H2.30%
mod
(999kHz)
Ti
1*oscilloscope.
SECTION COMMUNE MA/MF
1400(1404)kHz
(4) | ALIGNEMENT 4.7.
(2) 400Hz.30% mod
(X05-3150)
VR2 Arrume
INDICATEUR DE
SYNTONISATION
Reception MF
98, OMHz
INDICATEUR DE
SYNTONISATION
NIVEAU DE SEUIL
Reception MA { (X05-3150)
1000(999)kHz
SECTION AUDIO
COURANA DE
POLARISATION
(X09-2310)
VR1 (G)
VR2 (D)
Connecter un
voltmétre CC
CP1(CP2)

KR-V55R |
ABGLEICH
Fim, | cecrstwo | ersten | emsrouuine —[ensretiwme | ‘vowse | ascercu ron [np
GEGENSTAND EINSTELLUNG EINSTELLUNG EINSTELLUNG PUNKTE ABGLEICHEN FUR ABB,
UKW-EMPFANGSABTEILUNG AuBer wenn anders angegeben: die verschiedenen Schalter wie folgt einstellen:
EINGANGSUMSCHALTER: FM
(A)
98, OMHz
1kHz,+#75kH2 Hub
60dB( ANT-Eingang)
(A)
98, OMHz
1kHz,+75kz Hub
S0dB(ANT-Eingang)
DISKRIMINATOR
(1)
MONO
messer zwischen TP8 98, OMHz T
und TP9 anschlieBen,
2
MONO (X05-3150)
(B) 98, OMHz 13
Abstimmungen 1 und 2 mehrere Male wiederholen,
Einen 330k2 Wider-
Einen Gleichspannungs- (X05-3150)
DISKRIMINATOR
(2)
Miniwa!l Klirrfaktor,
- (A) standen zu TP7
SPANNUNGS- 98, OMHz assch]ieBen, Einen (X05-3150)
3 GEREGELTER 0 Hub Frequenzzahler uber 98, OMHz VRB 76, 00kHz
OSZILLATOR 60dB(ANT-Eingang) | einen Wechse! spannungs
messer an den Wider-
stand anschl ieBen.
(C)
98, OMHz
1kHz, £68, 25kHz Hub
Wahler3L oder R
Pilotten’
#6, 75kHz Hub
60dB( ANT-Eingang)
(C)
98, OMHz
IkHz,#68,25kH2 Hub
WahlersL oder R
Pilotten?
(X05-3150)
Frontende
IFT
KLIRRFAKTOR
(STEREO)
98, OMHz Miniwal Klirrfaktor,
Minimales Ubersprechen,
STEREO KANAL
TRENNUNG
(X05-3150)
VR4
Eine Ausgleichrege
lung kann notwendig seins
falls links-zu-rechts und
+6, 75kHz Hub rechts-zu-] inks.
60dB( ANT-Ei ngang) Trennungen ungleich sind.
MW-EMPFANGSABTEILUNG Die M¥-Rahmenantenne angebracht lassen. WAHLER: AM
(1) BANDKANTE messer zu TP2 530kHz (X05-3150) 1,5V
(1) anschlieBen, (531kH2) L3
‘ Einen Gleichspannungs- .
(2) BANDKANTE - messer zu TP2 1610kHz (X05-3150)
(2) ; anschl ieBen, (1602kHz) TC1
Abstimmungen (1) und (2) wehrere Male wiederholen,
(D)
(3) | HF-ABGLEICH 600( 603) kHz 600kHz (X05-3150) und Syesetrie des
400Hz.30% mod (603kiiz) L2 0szilloskopbi ides.
(D) Maximal Amplitude
(4) | HF-ABGLEICH 1400(1404) kHz (B) 1400kHz (X05-3150) und Symmetrie des
(2) 400H2.30% mod ; (1404kHz) TC2 0szilloskopbildes.
Abstimmungen (3) und (4} mehrere Male wiederholen, -
(D)
Maximal
Amplitude
(5)
|
ZF-UBERTRAGER
1000(999)kHz
(B)
1000kHz
(X05-3150)
/
und
Symmetrie
des
400Hz.30%
mod
(999)
kHz
Tl
0szilloskopbildes.
MW/UKW-EMPFANGSABTEILUNG Die MW/UKW-Rahmenantenne angebracht lassen, WAHLERS AM/FM
98, OMHz
Maximal Amplitude
(A)
98, 0MHz
0 Hub
18dB(ANT-Eingang)
UKW-emptang | (X05-3150)
98, ONH2 VR2
(X05-3150)
YR1 Einschalen
. (X09-2310)
Volume: 0 VR1 (L) 18aV
VR2 .(R)
ABSTIMNANZEIGE
SCHWELLENPEGEL
Einschalen
(D)
1000(999 kHz
Mi-emptang
1000(999)kHz
(6) | ABSTIMMANZEIGE
Einen Gleichspan-
nungsmesser tiber
cP1(CP2)

o3yu3SLS
QILBHLNAS|
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Ws]
—
[SSNOHd]
KR -VS55R
FRONT
Refer
to
the
schematic
diagram
for
the
values
of
resistors
and
capacitors.
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FKR-V55R_KR-V55R |
PC BOARD
300Hz 3kz
63Hz = IkHz 1OkHz
a
Refer to the schematic diagram for the values of resistors and capacitors.
X13-5540-10
KR-V55R