Kenwood KR-4140 User manual

KENWOOD
HI/Fl STEREO COMPONENTS
SERVICE MANUAL
KR-4140
SOLID STATE AM-FM STEREO RECEIVER

PARTS DESCRIPTION LIST
MAIN CHASSIS (AEOK) SECTION
PC BOARD
RF UNIT
(UA1125K)
1F UNIT (UA1224K)
MPX UNIT (75S)
PRE, TONE & MAIN (UA6001J3)
X01-0025-10
X02-0020-10
X04-0010-10
X09-0013-03
Symbol No.
Description
Part No.
Remarks
CAPACITOR
Ci
C101
C111
C112
C113
C114
C171
C201
C211
C212
C213
C214
C301
C302, 303
C304
C305
C306
Electrolytic Tubular
Mylar
Mylar
Mylar
Mylar
Mylar
Electrolytic Block
Mylar
Mytar
Mytar
Mylar
Mylar
Oil tmpregnated
Oil tmpregnated
Electrolytic Block
Electrolytic Tubular
Electrolytic Tubular
100uF
0.027 uF
0.0015uF
0.068uF
0.018uF
0.0056uF
2200uF
0.027pF
0.0015uF
0.068uF
0.01 8uF
0.0056uF
0.01 uF
0.02uF
2200uF
470uF
100uF
3.15WV
+20%
+20%
+20%
+20%
+20%
35WV
+20%
+20%
+20%
+20%
+20%
+100%,
+20%
5OWV
35WV
16WV
CEO4WOF 101
CQ92M1H273M
CQ92M1H152M
CQ92M1H683M
£092M1H183M
CQ92M1H562M
CE62AW1V222
CQ92M1H273M
CQ92M1H152M
CQ92M1H683M
CQ92M1H183M
CQ92M1H562M
CP052W103P
CP02B2J203M
CE62AW1H222
CEO2W1V471
CEO2W1C101
RESISTOR
R1
R101
R102
R111, 112
R113
R114
R171
R172
R173
R201
R202
R211, 212
R213
R214
R271
R272
R273
R301
R302
R303
R304
R305
R306
R307, 308
R309
Insulated Carbon Film
Insulated Carbon Film
Insulated Carbon Film
Insulated Carbon Film
Insulated Carbon Fitm
Insulated Carbon Film
Fixed Carbon Composition
Fixed Carbon Composition
Insulated Carbon Film
Insulated Carbon Film
Insulated Carbon Film
Insulated Carbon Film
Insulated Carbon Film
Insulated Carbon Film
Fixed Carbon Composition
Fixed Carbon Composition
Fixed Carbon Composition
Fixed Carbon Composition
Insulated Carbon Film
Insulated Carbon Film
Insulated Carbon Film
Meta! Film
Fixed Carbon Composition
Fixed Carbon Composition
Fixed Carbon Composition
+10%
£10%
+10%
+10%
+10%
£10%
£10%
£10%
+10%
+10%
10%
£10%
+10%
+10%
+£10%
£10%
+10%
+10%
+5%
15%
+5%
+5%
+10%
10%
+10%
PD14BY 2E561K
PD14BY 2E 104K
PD14BY 2E394K
PD14BY 2E 103K
PD14BY 2E472K
PD14BY 2E273J
RCOSGF 2H102K
RCO5GF 2H331K
PD14BY 2E 102K
PD14BY 2E 104K
PD14BY 2E394K
PD14BY 2E 103K
PD14BY 2E472K.
PD 14BY 2E273J
RCO5GF 2H102K
RCO5GF 2H331K
RCOS5GF 2H560K
RCOSGF 2H 102K
RW14AG3S1515
RW14AG3G561J
RW14AG3S681J
RN14AB3D 102J
RCOSGF 2H152K
RCO5GF 2H220K
RCOS5GF 2H 222K

PARTS DESCRIPTION LIST
Symbol No.
Description
VOLUME =_ (50k2.B) Dual
BALANCE (100kQW) Slide
BASS (50k2A) Dual
TREBLE (50kQA) Dual
POTENTIOMETER
a
RO6-4005-05
R13-4005-05
RO8-4042-05
RO08-4042-05
TRANSISTOR/DIODE/THERMISTOR
~ 2SD155
28D234
$1802-03B
18338T
5T-31
SWITCH
SELECTOR (Rotary) F°4:14-4
MODE (Rotary) F°2°4°5
LOUDNESS (FIVE Pushbutton)
TAPE MONITOR (FIVE Pushbutton)
MUTING (FIVE Pushbutton)
' LOW FILTER (FIVE Pushbutton)
HIGH FILTER (FIVE Pushbutton)
SPEAKERS (Rotary) F°1°4-4
PRE-MAIN SEPARATE SW (Slide)
Chassis
Frame
Panel
Sub-Panel
Reflector (A)
Sole Plate
Thermistor Holder x 2
Antenna Holder
Meter Holder
Ring
Name Plate (for Antenna)
Front Glass
Filter
Decorated Panel
Dial
Diat Pointer
Pilot Lamp (Fuse Type) x 4
Pilot Lamp
Meter
Certification
Decorated Panei
Schematic Diagram
Flywheel
Dial Spring
Small Pulley x 2
Smali Bushing x 4
Small Bushing x 4
Dial Metal Fittings
Pulley
$04-4012-05
$04-2037-05
$41-5001-05
$41-5001-05
$41-5001-05
$41-5001-05
$41-5001-05
$04-1024-05
$10-22D
A10-0210-01
A15-0002-04
A20-0326-05
A23-0076-02
A33-0009-03
A40-0058-03
A90-310B
A5065
A5107B
BO7-0064-04
B09-190
B10-0033-02
B19-0087-03
B42-0225-02
B20-0160-03
B21-4001-05
B30-0015-15
B30-0033-03
B31-0006-05
B42-0009-04
B42-0225-03
B52-0076-00
DO5-52B
D06-02
DO9-14B
D10-05
D10-09
D11-13
D15-0058-04

PARTS DESCRIPTION LIST
Symbol No.
Description
Part No.
Remarks
Dial Shaft
Pin Jack (1P)
Pin Jack (4P)
Pin Jack (6P)
AC Outlet x 2
PHONE Jack
Pin Jack with DIN Connector (4P)
Pilot Lamp Socket
MIC Jack x 2
Transistor Socket x 4
Radiator
Felt with Sticker
Dust Sheet
Shield Plate (for Radiator)
Insulating Plate (for Power SW)
Rubber Bushing
Legs x 4
Cord Bushing
AC Cord Bushing
Corrugated Cardboard Case
Warranty Card
Fuse Holder x 4
Front Glass Holder x 2
Front Glass Holder x 3
Meter Holder
Dial Holder
Meter Holder
Front Glass Holder x 2
Switch Holder
P. C. Board
P. C. Board
Knob (TUNING)
Knob (SPEAKERS, BASS, TREBLE, MODE, SELECTOR, VOLUME)
Knob (BALANCE)
Power Transformer
FM Antenna
Ferrite Loopstick Antenna
Chocke Coil
Fuse Holder
Feeder Holder
Switch Stopper
Slider
AC Cord with Plug
In USA added to the parts of (K),
In PX added to the parts of (U)
Case (K)
Rear Panel (K)
Rear Panel (U)}
Amp Holder x 2 (K)
Holey Plate (U)
Caution Sticker ; (U)
D20-0079-03
E08-11C
E08-14G
E08-16D
E08-0205-05
E11-0002-05
E13-0401-05
E15-0033-05
E16-22
E4086
F01-0001-13
F15-0008-04
F15-0054-04
F10-0185-03
F20-0027-04
G02-020
G10-02
G11-19
G11-25
H01-0507-03
H26-02
J13-0023-05
J19-0029-14
J19-0062-04
J19-0063-03
J19-0064-04
J19-0065-03
J19-0091-04
J21-0703-04
J25-0062-04
J25-0063-04
K23-0047-03
K23-0049-03
K23-005 1-04
LO3-0006-05
L10-04
L15-39
L20-010
$15-13
$21-29
$4103
$4132
WO09-15
A01-0124-02
A23-0165-02
A23-0167-02
A3882
BO4-0017-14
BO9-192

Symbol No.
Description
Part No.
Remarks
Caution Sticker (K)
Caution Sticker (K)
Caution Sticker (K)
Instruction Manual (K)
Instruction Manual (U)
Caution Card (U)
Pin Plug x 4 (U)
Fuse (2A) (K)
Dial Cover (U)
Insulating Plate (K)
Insulating Plate (K)
Corrugated Cardboard Case (K)
Warranty Card (U)
Caution Card (for Case) (K)
Address (U)
Caution Card (for AC VOLTAGE SELECT)
Switch Stopper (U)
Decorated Screw x 4 (K)
Decorated Screw x 4 (U)
Fuse
(2A)
(U)
AC VOLTAGE SELECT (U)
Power SW (Pushbutton) (U)
Power SW (Pushbutton) (K)
B42-0046-04
B42-0219-04
B42-0220-04
B50-0480-00
B50-0481-00
B58-0003-00
E09-410
FO5-2021-05
F07-0171-03
F20-0023-03
F20-0030-03
H02-01 10-03
H26-17
H4068
H4156
H4190
4J19-0082-04
NO8-0003-04
NO8-0005-04
$17-02
$31-2004-05
$39-1010-05
$39-1011-05
Fae ke rn aE tala abate ee Pee 8 a

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SYMPTOMS:
A. When there is load hum at the speakers.
B. When there is no output at all.
C. When you cannot get rated output.
REPLACING METHOD:
Replace all the four transistors, 2SD155.
TESTING PROCEDURES:
Until
replacement
is
completed,
do
not
operate
the
unit
without
first
testing.
Perform
the
test
according
to
the
following
procedures.
1.
Using
variable
transformer,
lower
the
AC
line
voltage
to approximately 30 V.
2.
Also
measure
the
voltage
between
the
chassis
and
Collector
of
the
power
transistor
Q2
or
Q3.
If
a
tester
indicates
approximately
25
V,
it
is
normal.
3.
Using
a
tester,
measure
the
voltage
between
the
chassis
and
Collector
of
the
power
transistor
Q1
or
Q4.
Ifa
pwdicales AO SOV, it is
PROTECTION ADJUSTMENT PROCEDURES:
The protection circuit in “UA6001J3” is a non-adjustment
circuit. But, check the circuit for normal operation as
follows for cautipns sake;
With a 8 ohms dummy load and an oscilloscope connected
in parallel to the output terminal, place the controls on
“KR-4140” in their normal positions.
Apply a signal of 1,000 Hz to the input and adjustment the
volume control until “UA6001J3” provides an output of
10 W as measured across the dummy load. Try to short
across the dummy and then restore it to the normal
connection under the above conditions and check to see
that the scope sweeps with no waveform once and then
with the waveform represented, thereby showing that the
protection circuit is operated normally. If the protection
circuit fails to operate, turn off the power switch immedi-
ately, otherwise the final stage transistors may be damaged.
And then check transistors, Qe17 ~ 19 and Diodes, De5, 6
whether they are good or not.
BOTTOM VIEW OF TRANSISTOR
Von
2SD155
Normal.
——
Bo
° 66
°
CASE
COLLECTOR
a3
a4
a2
a1
LEFT
RIGHT
CHANNEL
CHANNEL
25V
-50V
25V
50V
COLLECTOR
COLLECTOR
COLLECTOR
COLLECTOR

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| ALIGNMENT PROCEDURE
sts
Instruments:
Warm-up:
Selector SW:
Alignment tool:
Dummy
Antenna
TUNER SECTION
FM ALIGNMENT PROCEDURE
FM SG, AC VTVM & Oscilloscope
Allow 30 minutes warm-up period for receiver and equipments
Always place in FM AUTO position
FM SSG
Coupling | Input Signal
NATOR
RF AMP
CIRCUIT
RF AMP
CIRCUIT
Direct
High side
to (A)
Low side
to Chassis
10.7 MHz
(Unmod.)
Tuning Dial
Setting
Output
Indicator
Adjust
IF transformers require a plastic screwdriver-type alignment tool.
Remarks
Any non-
interfering
setting
300 ohm
Carbon
Resistor
DISCRIMI-
300 ohm
Carbon
Resistor
300 ohm
Carbon
Resistor
FM 400 Hz (Mod.)
Antenna 75 kHz (Dev.)
Terminal 0.5~1mVv
(Input)
90 MHz
FM 400 Hz (Mod.)
Antenna 75 kHz (Dev.)
Terminal 1.5 ~2uV
(Input)
98 MHz +
une for
maximum
using tuning
indicator
90 MHz
Tuning Indicator
VTVM at
LEFT output
jack of
TAPE REC
VTVM & X-tal
earphone at
jack of TAPE
REC
106 MHz:°
FM 400 Hz (Mod.)
Antenna 75 kHz (Dev.)
Terminal 1.5~2yuV
(Input)
Repeat steps 3 & 4 until n
106 MHz
VTVM & X-tal
earphone at
LEFT output
jack of
TAPE REC
(UA1125K)
Tal
(UA1224K)
Lb2, 3, 5 Top
& Buttom
(UA1224K)
Lb8 Top &
Bottom
(UA1125K)
Lal ~La4
(UA1125K)
CTal ~CTa5
Maximum Deflec-
tion
Maximum Deflec-
tion
Maximum Deflec-
tion
Maximum Deflec-
tion
further improvement is possible.
OUTPUT
LEVEL
300 ohm
Carbon
Resistor
98 MHz
400 Hz (Mod.)
75 kHz (Dev.)
1m V (Input)
FM
Antenna
Terminal
Tune for
maximum
using tuning
indicator
VTVM & X-tal
earphone at
LEFT output
jack of
TAPE REC
(UA1224K)
VRb1
Set the output
level to 1V
1. Instruments:
2. Selector SW:
3. Warm-up:
Audio Signal Generator
Coupling
FM MPX ALIGNMENT PROCEDURE
(a) SCA FILTER
Audio SG, AC VTVM & Oscilloscope
Always place in FM AUTO position
ALIGNMENT PROCEDURE
Allow 30 minutes warm-up period for Receiver and equipments
Audio Signal Generator
Frequency
AC VTVM & Oscillo-
scope Coupling
High side to (B)
Low side to chassis
1. Instruments:
2. Selector SW:
3. Warm-up:
FM SSG
Modulation
engin Frequency
67 kHz
(0.5 V)
High side to (C)
Remarks
(X04-0010-10)
Low side to chassis Le3
(b) MPX
FM SG, Audio SG, AC VITVM & Oscilloscope
Always place in FM AUTO position
Minimum Deflection
Allow 30 minutes warm-up period for Receiver and equipments
(Field Strength:
19 kHz
Carrier
Teapot Switch
Selector
VTVM &
Oscilloscope
Connection
Adjust
FM Antenna
Terminal GPP
OFF
High side to (C)
Low side to chassis
1000uV at Antenna Terminal)
Remarks
(X04-0010-10)
Lcl1, Lc4
FM Antenna
Terminal
OFF or
400 Hz
A+Bor
REVERSE
OFF
To distant of
Antenna
Terminal
A PHASE
REVERSE
LEFT or RIGHT
output jack of
TAPE REC
FM Antenna
Terminal
Aor LEFT
(X04-0010-10)
VRcl
Maximum Deflec-
tion
Beacon Lamp
“ON”
(X04-0010-10)
Lce4
To obtain a wave
form with maxi-
mum amplitude
at 400 Hz on
oscilloscope
RIGHT output
METER
SETTING
300 ohm
Carbon
Resistor
98 MHz
400 Hz (Mod.)
75 kHz (Dev.)
1 mV (Input)
FM
Antenna
Terminal
Tune for
maximum
deflection
VTVM &
X-tal ear-
phone at
LEFT out-
put jack of
TAPE REC
Tuning
Indicator
(UA1224K)
Lb7
VRb2
64?
indicator
FM Antenna
Terminal
B or RIGHT
LEFT output
—___
Repeat steps 4 & 5 until no further improvement is possible.
(UA6001J3)
VRd1
Minimum Deflec-
tion
(UA6001J3)
VRd1
Minimum Deflec-
tion