Kenwood KR-710 User manual

KENWOOD
HI/Fl STEREO COMPONENTS
SERVICE MANUAL
KR-710
(KR-710L)
An item of adjustment is written in three languages — English, French and German.
Un article sur réglages est écrit en trois langues, Anglais, Francais et Allemand.
Ein Artikel der Abgleich wird auf drei Sprachen, Englische, Franzdsisch und Deutsch
geschrieben.
Photo is KR-710
STEREO RECEIVER

CONTENTS |
EXTER NAG VIEW iiss costes ees ten desea 3
INFERNAL VIEW scccaciescncniieisiimat y oro eet 4
BLOCK & LEVEL DIAGRAM.............0.0.. ee eters 4
DIAL ‘CORD STRINGING 2 hieeiiiien hice are 5
PE PA hc cssenn otis esate ated eens roe onion 5
EXPLODED VIEW ci teriekcine ened wae ee 6
ADJUSTMENT/REGLAGES/ABGLEICH |... en 7
PC GOAR D oes ee et 14
SCHEMATIC DIAGRAM (KR-710) ....00.00 res 15
SPECIFICATIONS (KR-710) ........... cece ccc cece eee e eee ees 15
SCHEMATIC DIAGRAM (KR-710L) ................. cece etree eee: 16
SPECIFICATIONS (KR-710L) 2.0.0.0... neee reece arenas 16
PARTS UST sci eee ee ee ie 17
Photo is KR-710L
_ Note:
~ Component. and. circuitry. are. ‘subject to. modification to insure best 3
operation under differing | jocal: conditions. ‘This. ‘manual is based on, the |
Se (K) standard, and prov des information: on regional, circuit modifi catio
rough use of alternate schematic diagrams, and information ¢ ‘on n regional ;
Hoe pen sieeenee bestared
eens eoeenee
. Seas eg teh tweens Of 20x Pasewesesegentes
ee SP eR s ers rerescereese ernest see Tyee ly ot amere
er Se ee ere eee rr err ee ee ee eee ee eee eee eee ee
ORs sesetsesevidecseenenseussessedonenanees
peg tte
7 F, ; : Engisad ween LT ERT OHA ATO ORE E REESE GERAD HE ES st teerenseesenenee onrewne ‘ane

KR-710
EXTERNAL VIEW
Dial pointer ass’y Knob
(B21-004 1-05) ({K27-0132-04)
Dial calibrations
(B20-0463-04)
KR-710
STEED ECE ES
Knob Knob
{K23-0339-04) (K23-0347-04)
Knob
(K27-0132-04)
Knob
(K27-0136-04
Phone
jack
Knob
Knob
(E11-0074-05)
(K23-0348-04)
(K23-0348-04)
GND
terminal
AC
out
let*
‘
(NQ8-0128-35)
(EQ3-)-
Antenna
terminal
Slide
switch*
(E20-0439-05)
{S31-)
Phono jack Power cord® Foot*
{E13-0612-05) (E30-) (JO2-)
Phono jack SP terminal
{E13-0423-05) {E20-0813-05)
*Refer to parts list. (P17)
PHOTO is KR-710.

INTERNAL VIEW/BLOCK & LEVEL DIAGRAM
Power
transformer*
Receiver
PCB
ass
'y*
Power
amp
section
(LO1-)
(X14-)
Front
end*
Power
supply
section
|
{(W02-)
Tuner section
Power amp section Phono section
*Refer to parts list. (P17)
PHOTO is KR-710L.
BLOCK & LEVEL DIAGRAM
ET type.
Ceramic
‘te LPF
FM Y iz
C2 Ct 1C2 aT
TUNING
CIRCUIT
er: peer (FT
am Q— Z8 a8
Le C3 L4
am ww
I
|
ats fee as
Zz
ee
PHONO
AM
>
TAPE
B
TAPEA
HIGH
FIL
LouNess
VOLUME
BALANCE
coe
aKERS
Prono
@
S198
-O-81+-
01
WOO
-#-#
C5, 6 $1 $2 3 5 6 OCt«SS $7
—rec
©
5
$
S
—
[ LPLAY @
TAPE
| r— REC C
Leay @
© I4.9V/8N
39.948
2.35mV

DIAL CORD STRINGING /REPAIR
DIAL CORD STRINGING
Tie the dial cord to the dial spring.
Set the dial pulley as illustrated.
Hook the dial spring on the boss A.
oh ee
starting from its lower side.
2)
starting from its upper side.
8. Tie the end of the dial cord to the dial spring.
9. Remove the dial spring from the boss A.
_ Receive a 90 MHz signal, and then mount the dial
pointer at the 90 MHz position of the dial calibrations.
POWER TRANSISTOR REPLACEMENT
Mica plate
Inslating bushing
{F29-0030-00)
Hexagon bolt
(NO9-0298-08)
Dress the dial cord in the direction 1 through 4.
Wind the dial cord two turns around the dial shaft
_ Dress the dial cord in the direction 5 to 6.
7. Wind the dial cord two turns around the dial pulley
Boss A
Dial spring

EXPLODED VIEW
M318
(Bre—Tap)
M3x14
(@r—Tap}
M4356
tf — Tap}
M3x8
(Or— Tap)
’ M318
{6r—Tep)
+4
Refer
to
Parts
List
on
page
17.
iG
x
6
(F-Tap}
:-N88-3006-46
:
x
8 -N30-3008-46
M3 x 8 (Bi-Tap) BLK :N89-3008-45
W3x%8
(Bi~Tap? BLK
M3xe
(8r—-Tap)
M3 x 8 (8r-Tap)
M3 x 14 (Br-Tap)
M3 x 20
43x78
(Or ~Tap)
M38
J i6r—Tap)}
KR-710
:N87-3008-46 M48 (Br-Tap}) §:N87-4008-46
:-N87-3014-46
:N30-3020-46

KR-7 100
ADJUSTMENT (TUNER)
oe TEST EQUIPMENTS RECEIVER OUTPUT ADJUSTMENT
SSO ee CONNECTION SETTING SETTING | INDICATOR POINTS
DISCRIMI-
95
MHz
FM-MONO
95 MHz “
penn
ditto
1
kHz,
+75
kHz
Dev
ditto
ae
L7
OV
60 dB (ANT input)
DISCRIMI-
Minimum
El NATOR (3) ce
Frequency
EM- counter to the
junction of 76 kHz
VCO ditto AUTO/MUTE R22 and VRS VRQ +200 Hz
95 MHz via an AC
voltmeter *3
95 MHz
1
kHz,
+68.25
kHz
Dev
PA
reas
7
T1
Minimum
IFT © eres ag R (Front end) distortion
60 dB (ANT input)
SEPARA-
. . .
F
1 O00
kHz
AM
Maximum
folm
|
@
|
400
Hz,
30% Mod
1
000
kHz
TRACKING
.
600
kHz
AM
.
|
TRACKING
re
1
400
kHz
AM
TC1,
2
sae
(2)
400
Hz.
30% Mod
1 400
kHz
(Front
end)
1 000
kHz
MW
Maximum
MW
.
600
kHz
MW
.
Gece
ditto
400
Hz,
30%
Mod
600
kHz
ditto
MW
.
1
400
kHz
MW
|
lo
ee
400
Hz,
30% Mod
1
400
kHz
ditto
LW
.
160
kHz
LW
1
asia
400
Hz,
30%
Mod
160
kHz
ditto
95 MHz
O Dev
60 dB {ANT input)
Bar antenna (A)
12 ditto
TC1, 2
(Front end) aio
Bar antenna (B)
L1
LW |
340 kHz LW :
*1~4: See page 10.
ditto

REGLAGES (TUNER)
REMARQUES
| ss APPAREILLAGE
ALIGNEMENT !rRaccorp-
SECTION MF
DISCRIMI- 95 MHz FM-MONO |
NATEUR (1) 1 kHz. +75 kHz Dév 95 MHz
95 MHz
Spat idem 1 kHz, +75 kHz Dév
60 dB (Entrée ANT)
DISCRIMI- Distorsion
Relier un
OSCIELA- | 95 MHz EM: ae sepa 76 kHz
TEUR idem 0 Dév AUTO/MUTE | “\ Bone VRQ Reeatrs
76 kHz 6O dB (Entrée ANT) a
voltmétre
CA. *3
TFi ©
(+6.75 kHz Dév)
60 dB (Entrée ANT)
Deel ee ee
SELECTION: Lou R
Signal pilote
T1 Distorsion
(Partie frontale) minimale
SECTION MA (KR-710)
[ole | © | wih
2 [wenn] om | wate | atte | om | we [an
wre ate Late Ra =
SECTION MA (KR-710L)
TFI 1 000 kHz MW Déviation
400 Hz. 30% Mod 1 000 kHz maximale
MW- 600 kHz Antenne MA
ALIGNEMENT| ‘e™ 400 Hz, 30% Mod (A), L2
MW. oe 1 400 kHz Mw ae TCi2> aca
ALIGNEMENT 400 Hz, 30% Mod 1 400 kHz (Partie frontale) Sg
LW- ae 160 kHz LW Antenne MA spans
ALIGNEMENT 400 Hz, 30% Mod 160 kHz (B), L1
LW- . 340 kHz LW |
* 1~4: Voir la page 10.
idem idem

KR-7 101
ABGLEICH (EMPFANGER)
STEUR-
ABGLEICH | PRUFEINRICHTUNG = GERAT AUSGANGS.- EINSTELL- BEMER-
EINSTEL- ANZEIGE PUNKT KUNGEN
ANSCHLUSSE EINSTELLUNG LUNG
UKW-EMPFANGSABTEILUNG
DISCRIMI- 95 MHz FM-MONO
NATOR (1) 1 kHz, +75 kHz Hub 95 MHz
95 MHz
DISKRIMI- 1 kHz, +75 kHz Hub dito WZ
NATOR (2) 60 dB (Eingangs- R6
signalpegel)
DISKRIMI- 2 Minimaler
ee) NATOR (3) eo Klirrfaktor
Frequenzzahier
zum Kreuzungs-
SPANNUNGS- ante FM- punkt von ne
GEREGELTER dito + AUTO/MUTE R22 und VR9 VRQ
60 dB (Eingangs- uber einew +4 00
OSZILLATOR
signalpegel) Wechsel spann-
ungsmesser *3
1 kHz, +68,25 kHz Hub
Wahler: Loder R
Pilotton:
(+6.75 kHz Hub)
60 dB (Eingangs-
signalpegel)
Minimaler
Klirrfaktor
STEREO
KANAL *4
TRENNUNG
MW-EMPFANGS ABTEILUNG (KR-710}
1 000 kHz AM Marimaler
le : a 600 kHz AM dito L1,2
(1) 400 Hz, 30% Mod 600 kHz ‘
(2) 400 Hz. 30% Mod 1 400 kHz . (Frontende)
MW UND LW - EMPFANGSABTEILUNG (KR-710L)
1 O00 kHz MW a |
MW F
600 kHz
400 Hz. 30% Mod
erritantenna (A)
L2
TCT 2
(Frontende)
Ferritantenna (B) ans
L1
* 1~4: Sehen den page 11.
EMPFANGS-
BEREICH (1)
MWw-
EMPFANGS-
BEREICH (2)
LW-
EMPFANGS-
BEREICH (1)
LW-
EMPFANGS-
BEREICH (2)
dito dito
600 kHz
1 400 kHz
400 Hz, 30% Mod
MW
1 400 kHz dito
160 kHz
400 Hz, 30% Mod
LW
160 kHz
340 kHz
400 Hz, 30% Mod
LW
340 kHz

KR-7 1011)
ADJUSTMENT
(TUNER)/REGLAGES
(TUNER)/ABGLEICH
(EMPFANGER)
*
4
*
4
Minimum
output
Adjust
the
tuning
knob
so
that
the
same
on
Nice
A
compromise
adjustment
may
be
required
if
left-to-right
and
amount
of
noise
is
observed
at
the
top
and
right-to-left
separations
are
unequal.
bottom
of
the
output
waveform
with
a
weak
|
*
5
FM
fronted
signal.
The
FM
front
end
section
is
completely
adjusted
in
the
*2
factory
and
further
adjustment
is
not
necessary.
When
the
Connect
the
DC
voltmeter
across
R6.
FM
front
end
section
cannot
be
repaired
by
replacing
semiconductors,
replace
the
FM
front
end
PCB
ass'y
and
do
the
following.
(1)
Set
FM-SG
to
90
MHz,
1
kHz
Mod,
+75
kHz
Dev,
60
dB
and
connect
it
to
the
antenna
terminal
of
the
receiver.
(2)
Receive
the
FM-SG
signal.
Ole
Veale:
(3)
Fix
the
dial
pointer
at
90
MHz.
*
3
*
4
*
4
Sortie
minimale
Ajuster
le
bouton
d’accord
de
facon
que
la
Ses
Beit
Si
la
sortie
la
droit
de
diaphonie
et
la
gauche
ne
sont
cieest
méme
quantité
du
bruit
puisse
étre
observe
pas
méme
regler
le
potentiometre
ajustable
pour
que
la
ten-
au
sommet
et
en
bas
de
la
forme
donde
de
sion
de
sortie
est
méme.
sortie
sous
des
conditions
d’alimentation
de
*§
signal
faible.
Si
la
partie
frontale
FM
ne
peut
pas
étre
réparée
en
rempla-
WZ
cant
les
semi-conducteurs
PCB
de
la
partie
frontale
et
effec-
Relier
un
voltmétre
de
C.C.
sur
R6.
tuer
les
opérations
suivantes:
(1)
Régler
FM-SG
a
90
MHz,
1
kHz
Mod,
+75
kHz,
60
dB
et
le
connecter
ala
borne
d’antenne
du
récepteur.
=
(2)
Recevoir
le
signal
FM-SG.
(3)
Fixer
l'aiguille
du
cadran
a
90
MHz.
Voltmétre
de
C.C.
*3
VR9
Compteur
de
frequence
A
la
terre
©
TP
|
-
ao
R22
10