Kenwood KR-5030 User manual

KENWOOD
H!I/F! STEREO COMPONENTS
SERVICE MANUA
KR-5030
(KR-5330)
AM-FM STEREO RECEIVER

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t- ”
be *
CONTENTS
EXTERNAL
VIEWS
os
torites
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atuaseetes
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Oars
3
INTERNAL
VIEW
veya
eoatindoumeen
ieee
paca
Se
4
DIAL
CORD
STRINGING
i.
245-144
iacw
eu
seeeeeaedis
4
DISASSEMBLY
FOR
REPAIR
.........0
000s
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ees
5
BLOCK
AND
LEVEL
DIAGRAM
........-.
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6
CIRCUIT
DESCRIPTION:
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6
DESTINATIONS’
PARTS
LIST.
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ROIUSTMENT
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PC.BOARD
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sides
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SCHEMATIC
DIAGRAM
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15
SPECIFICATIONS
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16
KR-5330 has the black panel
and the cabinet.
The unit for PX has the cabinet.
* Note: °°: un j re he ne : '
/The’ products are subject to. modification’'ia components. and ‘circuits in,
“different countries and regions. This is because-each product.must be:used 3.::
» “under the best condition: This manual provides information of modification |.
..based onthe standard in. the U.S,, for: the convenience ‘ofordering
associated components and parts... | ae’ ogee gO
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M

EXTERNAL VIEW
Meter (pair) Dial calibrations Dial pointer Knob
(B31-0262-05) (B20-0412-05) {B21-0017-04) (K21-0342-04)
Panel ass’y *
88» 90 + 92 * 94 © 96 ' 98 *
80 uo no + AOD
Knob Ring
(K23-0280-04) (B07-0225-04)
Phone jack Ring Knob
(€11-0060-15) (B07-0224-04) (K27-0059-14)
AM bar antenna Phono jack AC outlet * Speaker terminal
(T390-0083-05) (€13-0415-05) : (E20-0811-05)
Terminal board Sg 2 slide switch * *
(€29-0088-05) {S$31-2048-05) Power cord Foot
* , 5
Refer to Destinations’ Parts Lis.

INTERNAL
VIEW/DIAL
CORD
STRINGING
Fuse Electrotytic AM bar
section capacitor ‘antenna
(C90-0363-05) (T90-0083-05)
Power EQ amp
supply section FM front end
section
Variable
capacitor
(C01-0185-05)
Power * :
transformer Diai pultey
SS (D15-0171-13)
ie: .
> an
ogy section
FM audio
amp section
Muting
Protection section
section MPX section
Meter
{831-0262-05)
Pilot lamp FEM-IF Rotary switch
(B30-0143-05)
section
Sg
1
(SO1-3023-05)
*
Refer
to
Destinations’
Parts
List.
DIAL CORD STRINGING
Dial pultey
(D15-0171-13)
j. Fully ctose the variable capacitor.
2. Fix the dial pulley to the shaft of the
variable capacitor using 2 screws as
shown. gt
3,
Tie the
dial
cord
to
the
dial
spring
leav-
=
ing a 10 cm length part of it. ae
4 Hook the dial spring on the boss, and
wind it half turn counterclock wise around Variable capacitor
(CO1-0185-05)
the dial pulley.
5. Dress the dial cord in the direction of
eeqee were Dial shaft ass‘y
ROY (D20-0136-04)
6. Wind the diat cord 2 turns around the
dial shaft starting from its upper side,
~ eae Se Small pull
then dress it in the direction of 3" to lia nage
(015-0170-14)
diggs
oO.
7. Tie the end of it tightly with remaining ak
a 100m dial cord. Smalt pulley |
8. Remove the dial spring from the boss. (D15-0172-04) ©
Mount the dial pointer as shown in the eee oral Ga
15- 14
illustration,
Dial pointer
(B21-0017-04)

a
ary aa
DISASSEMBLY F
POWER SUPPLY :
Electrolytic
capacitor 4
When removing the filter capacito
unsolder the lug of that.
Power supply q
PC board ass’y {
Etectrolytic
capacitor
Power supply
PC board ass’y
Capacitor mounting
clamp
When removing the power sup-
ply PC board ass‘y, remove the
four screws fixing electrolytic
capacitor mounting clamp.
Pilot lamp PC
board ass’y
@ Pilot lamp PC
Hi .
y board ass’y
Reflector Ve
Sips
PANEL ASS’Y
When removing the panel ass’y, pull knobs from each shaft
and remove nuts on the panel ass’'y. When removing tuner
PC board ass'y, remove the right boss @ and the screw(1),
When removing power
amp PC board ass’y,
remove the left boss !
screws (2). 2
Panel ass’y
When removing the pilot lamp
PC board ass‘'y, pull the hook
of reflector toward the arrow
direction and turn the PC board.
(K23.0280-04) ® O) “=
f
\
Knob | eo
(K21-0342-04) 0
REAR
PANEL
ASS’Y
TUNER
PC
BOAR
When
r
When
removing
the
rear
panel,
remove
the
screws
raméve
fixing
.the
rear
panel
to
chassis
“—
phono
jack
variable
terminal.
fixing
F
Note:
Should
not remove
the
star-
marked
screws
(
*
),
Terminal board
(€29-0088-05)
esses
Rear panel
~~

in
nee
ae
v
Caution:
SSEMBLY
FOR
RE
PAIR
pals
or
checking
the
internal
parts,
should
not
touch
the
heat
sink
by
reason
that
it
has
the
dual
power
voltage
during
POWER
TRANSISTOR
BLOCK
operation
of
amplifier.
\oving the filter capacitor,
the lug of that.
When removing the cover for pre-
Cover
for
preventing
venting
electric
shock,
remove
the
electric
shock.
star-marked
screws
(*)
in
the
figure.
When removing the power tran-
sistor
block,
first,
remove
the
vari-
stor from varistor mounting hard-
ware on the heat sink, next, re-
move
the
four
screws
fixing
the
heat sink mounting acry! board.
oe 8 (8r-Tap)
2
\
M3X8 (Br-Tap)
(N87-3008-46)
Heat sink mounting
acry! board.
Varistor | transistor
Soldering iron
POWER
AMP
PC
BOARD
ASS'Y
METER
Power amp PC
board ass'y
M3X8 (8r-Tap)
es
M3X8 (Br-Tap)
M3X8
au
panel
(Br-Tap)
-
(B31-0262-05)
When removing the power amp PC board ass’y,
remove the panel ass'y and the power transistor
block, and then remove the screw fixing the PC
board ass'y.
When repairing thre meter,
should remove the cover on
the heat sink. The meter
ass’y is mounted by 2 screws.
TUNER
PC
BOARD
ASS'Y
DIAL
CALIBRATIONS’
PILOT
LAMP
When removing the tuner PC board ass’y,
remove
the
dial
pulley
from
the
shaft
of
variable
capacitor
and
screw
and
push
rivet
fixing PC board ass'y.
Dial board ass’y ? :
When remeing the pilot
Jamp for dal calibrations,
loosen the srewv fixing the
dial board iss’ y and take
out the lamp window from
dial board ss'w. Next ex-
tend the lanp window tabs
and separat the pilot lamp
from the lang window.
When replaing the dial cali-
brations, rmove the dial
board ass'y and the lamp
window. Next pull out the
dial calibraiorws from dial
? Tuner PC board ass’y
y '
M3X8 (Br-Tap)
(NO9-0287-05)
Lamp window
Lamp
mounting
$ : :
board
ass‘ytowward
right
or
board
Dial
calibrations
left.
Chassis
Dial
pulley

BLOCK
AND
LEVEL
DIAGRAM
IF
L95 CFg1 Qg4
a
Ll
a,
ICg3
#2
/
/
Qg3
/
/
[ees
|
BAR
ANT
tg11
CFg4
Sg1
Sg1
PROTECTION
CIRCUIT
from TUNER
BALANCE
AUDIO
S03
$94
S95
VRg3
VRm3
Sm2
(X09-1240-10)
PROTECTION
SPEAKERS
100K
200K
SUBSONIC
al
AUX
Cc
VOLUME
Sgi: SELECTOR
‘
-
f:
1
kHz
Letav@
S92:
DE-EMPHASIS
S93:
8
MONITOR
odB=1V
Sg4:
A
MONITOR
Sg5:
LOUDNESS

CIRCUIT DESCRIPTION
omii ©
o
+Vee \
vi)
pms ©)
switch to be ON.
To output
terminal
~Vec
Overtoad
a
{output
short-circuited.)
Fig. 1
Fig.
1
shows
a
protection
circuit
used
in
the
KR-5030.
This
circuit
operates
for
ASO,
DC
detection,
and
preven-
tion
of
shock
noise
generated
during
ON-OFF
operation
of
the
POWER
switch.
POWER-ON
When
the
POWER
switch
is
turned
on,
charging
current
flows
into
Cm34
by
the
effect
of
+Vcc.
Since
Qm23
does
not
turn
on
unless
Cm34
is
completely
charged
and
the
base
potential
exceeds
0.6
volt,
time
constant
of
Cm34
and
Rm75
is
made
to
be
more
than
the
time
necessary
for
cir-
cuit
stabilization.
Thus
shock
noise
cannot
appear
at
the
output
circuit.
POWER-OFF
When the POWER switch is turned off, voltage at point B
quickly
lowers
to
O
voit
and
the
base
potential
of
Qm23
is
reduced to turn off Qm23 itself. This causes the relay to
release and generation of shock noise is prevented. While
the
power
supply
circuit
is
live,
potential
at
point
C
is
higher
than
that
at
point
B.
Namely,
Dm11
is
reverse
bias.
How-
ever, when the POWER switch is turned off, potential at
point C immediately tends to lower to O volt due to dis-
charge
through
Rm80.
On
the
other
hand
Cm34
has
a
large
static
capacity
and
it
is
in
the
same
power
supply
system as for the power amplifier. Therefore if there is no
circuit of Omi1, etc., discharge time of Cm34 becomes
longer and the relay cannot release immediately. Thus
shock noise is generated.
AC
Reverse bias when power
ASO
When the output terminals are short-circuited, overcurrent
flows into power transistors and ASO detection transistor
Qm19 is turned on. The Qm19 turned on jowers base
potential E of Qm22 which is thereby turned on. The
Qm22 turned on causes Qm21 to turn on and it lowers
potential at point B, thus turning off Qm23. This makes
the relay released and the overload is reduced.
DC DETECTION
The relay is released when DC voltage appears at the out-
put terminals. Thus the loadspeaker system can be protect-
ed.
When
positive
(+)
potential
is
generated
at
the
output
terminals,
Qm21
is
turned
on
to
lower
potential
at
point
B
and
the
relay
is
released.
When
negative
(—)
potential
appears
at
the
output
terminals,
Qm24
is
turned
on
and
—Vcc
is
applied
to
the
base
potential
of
Qm23.
This
causes
Qm23 to turn off and the relay to be released.
AM-MUTING
+Vcc
Retay
AM signal tine
Signal short-
circuited to GND,
+Vec
-Vcc
Og8 C977
(When selector is set
to FM position.)
Fig. 2
Transistor Qg13 composes an AM mutingcircuit. When
the SELECTOR switch is set in the FM (aid also MONO)
position, +Vcc is applied. to the anode of Og8. Then voit-
age is applied to the base of Qg13 to turnit on. The AM
signal is transferred to the GND circuit and the tuner out-
put cannot be fed to the preamplifier. !n te AAM position,
voltage
to
the
base
is
applied
from
the
~-Vce¢
and
Qg13
is turned off. The signal is then fed to tle preamplifier.
When the POWER switch is turned off whilehe SELECTOR
switch is in the AM position, there may bea si gnal leakage
if a good timing with the relay function s rot secured.
To avoid leakage the AM signal is transferred to the ground
Circuit simultaneously when the POWER witch is turned
off. When the POWER switch is off, the rely criving trans-
istor Qm23 is also off and the coltector pcen tial is raised
as a result. This potential is applied to tte b.ase of Qg13
through
Ry75,
and
the
AM
signal
is
ledto
the
ground
circuit as described previously.

CIRCUIT DESCRIPTION
O93 FM signal tine
> To L.P.F. (a
+Vce
;
Qq7
or
8
Circuit for monophonic FM recep-
(\y’
tion,
when
the
selector
switch
to
Qgt2 mono position.
K) [ pe de ano eee
Qg11
|
ad
|
igh : | CJ LPF in ICg3
C7) 0a4 |
Qg9 Q) Le poe eae 7 | &
| $91-3r
— a Fae ee es Se
Ne poe | DMO ns To Qm21 |
lect
OV
(TUNE)
FM
front
ee
ee
ts
ES
pines
eer
0.8V
(DE
TUNE)
|
end and
Og6
/\
+Vec
| {Cg3. |
| MPX circuit works as monophonic
Qg10 is decided to | FM reception when power switch
operation of L.P.F. Hh nee | turning off.
+Vcc | ‘ |
| Cgso%7 Dg7/A iG
nomen |
L__—
Oelay circuit works when the Selector
Switch turning from
tion.
Fig. 3
Fig. 3 shows an FM muting circuit, which is controlled by
No. 12 terminal voltage of IC HA1137W for IF. Voltage at
No. 12 terminal is 0 volt during tuning and 0.8 volt during
detuning.
TUNING
QgQ is turned off during tuning and Qg10 and Qgi1 are
turned on at that time. When Qg10 is turned on, Dg3 is
reverse bias and ICg3 works as stereo operation. Since
Qg11 is turned on, Qg12 is also turned on to make Qg7 and
Qg8 turn on. Thus the FM signal can be fed to the preampli-
fier.
DETUNING
QgQ is turned on during detuning and both Qg10 and Qg11
are turned off at that time. When Qg10 is turned off, Og3
is forward bias and the ICg3 does not work as stereo opera-
tion. Since Qg11 is turned off, Qgi2 and also Qg7 and
Qg8 are turned off and the signal cannot be fed to the
preamplifier.
other to FM posi-
MONO operation takes place in the FM-MONO position
since the 19 kHz pilot signal is forcedly led to the grounded
circuit.
DELAY CIRCUIT
Switching over from AM to FM makes +Vcc pass through
Dg5 and power is supplied to the FM front-end circuit.
Since charging current flows into Cg79 at that time, Qq 2
is turned off. When Cg79 has been charged up completely ,
Qg12 is controlled by collector voltage of Qg11 and swith
$g1-3r.
Capacitor Cg79 which has been charged up during FM mole
then discharges and the delay circuit waits for switching
over from AM to FM again.
When the POWER switch is turned off during FM steno
reception, it takes much time until the relevant circit
stops functioning completely. This may make the IM
stereo lamp left unlit even after the POWER switch tas
been turned off. Therefore, this lamp is unlit by the fored
MONO circuit.

DESTINATIONS’
PARTS
LIST
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