KENWOOD KRFA4020E Service Manual

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Service Manual for KENWOOD KRFA4020E, downloadable as a PDF file.

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Please check the tuner PCB number before change C42,43 and X1 with new one .
DIMMER
P.CALL
P.CALL
A
SPEAKERS
B
MUTE
BASS BOOST
TAPE2/
MONITOR
SOURCE
DIRECT
BALANCE
SOUND
MULTI CONTROL
INPUT SELECTOR
VOLUME CONTROL
DOWN
UP
AV SURROUND RECEIVER
PHONES
BAND
AUTO
MEMORY
STANDBY
ON / STANDBY
POWER
-ON
OFF
­
TRAIT
REC OUT
PLAY IN
AUX
MD / TAPE1
TAPE2/
MONITOR
PLAY IN REC OUT PLAY IN
PLAY IN
PHONO
L
R
FM
75
GND
AM
SPEAKERS
+
--
+
R
+
--
+
L
L
R
B
A
SUBWOOFER
PRE OUT
SYSTEM CONTROL
SL16
(XS 8)
AC 220 -
240V
AC 110 -
120V
AC 220 -
240V
AC 110 -
120V
50 s
FM 50kHz
AM 9kHz
DE-EMPHASIS
CHANNEL
SPACE
75 s
FM 100kHz
AM 10 kHz
SWITCHED TOTAL
150W MAX
AC 110 -120V/220 -240V `
50/60HZ
AC outlet
(E03-0149-05)
Lock terminal board
(E70-0080-05)
Lock terminal board
(E70-0068-05)
Phono jack
(E63-0068-15)
Phono jack
(E63-1016-05)
Slide switch
(S62-0034-05)
Miniature phone jack
(E11-0347-05)
Knob
(K29-7365-12)
Knob
(K29-7365-12)
Knob
(K29-7307-14)
Front glass
(B10-3475-02)
Power cord bushing
(J42-0083-05)
Knob
(K29-7310-03)
Knob
(K27-2185-04)
Foot
(J02-1167-03)
KENWOOD badge
(B43-0302-04)
Indicator
(B12-0334-14)
Phone jack (3P)
(E11-0295-05)
Metallic cabinet
(A01-3533-01)
Phono jack
(E63-0173-05)
Slide switch
(S62-0001-05)
AC power cord
(E30-2592-15)
Slide switch
(S62-0034-05)
Panel
(A60-1585-01)
Knob
(K29-7306-14)
AUDIO VIDEO SURROUND RECEIVER
AR-304/KRF-A4020/
A4020E/A4020W
SERVICE MANUAL
© 1999-1/B51-5501-00 (K/K) 3390
Illustration is KRF-A4020 Mtype.
background image
Please check the tuner PCB number before change C42,43 and X1 with new one .
DIMMER
P.CALL
P.CALL
A
SPEAKERS
B
MUTE
BASS BOOST
TAPE2/
MONITOR
SOURCE
DIRECT
BALANCE
SOUND
MULTI CONTROL
INPUT SELECTOR
VOLUME CONTROL
DOWN
UP
AV SURROUND RECEIVER
PHONES
BAND
AUTO
MEMORY
STANDBY
ON / STANDBY
POWER
-ON
OFF
­
TRAIT
REC OUT
PLAY IN
AUX
MD / TAPE1
TAPE2/
MONITOR
PLAY IN REC OUT PLAY IN
PLAY IN
PHONO
L
R
FM
75
GND
AM
SPEAKERS
+
--
+
R
+
--
+
L
L
R
B
A
SUBWOOFER
PRE OUT
SYSTEM CONTROL
SL16
(XS 8)
AC 220 -
240V
AC 110 -
120V
AC 220 -
240V
AC 110 -
120V
50 s
FM 50kHz
AM 9kHz
DE-EMPHASIS
CHANNEL
SPACE
75 s
FM 100kHz
AM 10 kHz
SWITCHED TOTAL
150W MAX
AC 110 -120V/220 -240V `
50/60HZ
AC outlet
(E03-0149-05)
Lock terminal board
(E70-0080-05)
Lock terminal board
(E70-0068-05)
Phono jack
(E63-0068-15)
Phono jack
(E63-1016-05)
Slide switch
(S62-0034-05)
Miniature phone jack
(E11-0347-05)
Knob
(K29-7365-12)
Knob
(K29-7365-12)
Knob
(K29-7307-14)
Front glass
(B10-3475-02)
Power cord bushing
(J42-0083-05)
Knob
(K29-7310-03)
Knob
(K27-2185-04)
Foot
(J02-1167-03)
KENWOOD badge
(B43-0302-04)
Indicator
(B12-0334-14)
Phone jack (3P)
(E11-0295-05)
Metallic cabinet
(A01-3533-01)
Phono jack
(E63-0173-05)
Slide switch
(S62-0001-05)
AC power cord
(E30-2592-15)
Slide switch
(S62-0034-05)
Panel
(A60-1585-01)
Knob
(K29-7306-14)
AUDIO VIDEO SURROUND RECEIVER
AR-304/KRF-A4020/
A4020E/A4020W
SERVICE MANUAL
© 1999-1/B51-5501-00 (K/K) 3390
Illustration is KRF-A4020 Mtype.
background image
DIMMER
BASS
BOOST
TUNER
CD
1
2
3
4
5
60
789
+
1
0
TAPE2/
MONITOR
TA/NEWS
PTY
DISPLAY
AUX
MULTI
CONTROL
MD/TAPE1
REMOTE
CONTROL
UNIT
RC-R0708
PHONO
6
7
¡
2
TUNING
DISC
SKIP
%
VOL.
DOWN
VOL.
UP
MEMORY
S.DIRECT
SOUND
BALANCE
fi
1
¢
P.CALL
4
BAND
AUTO
A/B
+100
POWER
fi
fi
MUTE
DIMMER
BASS
BOOST
TUNER
CD
1
2
3
4
5
60
789
+
1
0
TAPE2/
MONITOR
TA/NEWS
PTY
DISPLAY
AUX
MULTI
CONTROL
MD/TAPE1
REMOTE
CONTROL
UNIT
RC-R0709
PHONO
6
7
¡
2
TUNING
DISC
SKIP
%
VOL.
DOWN
VOL.
UP
MEMORY
S.DIRECT
SOUND
BALANCE
fi
1
¢
P.CALL
4
BAND
AUTO
A/B
+100
POWER
fi
fi
MUTE
FM
(T90-0836-05)
indoor antenna
AC plug adaptor (1)
(E03-0115-05)
(1)
Loop antenna stand (1)
AM loop antenna (1) (T90-0833-05)
(J19-3645-05)
Remote control unit (1)
Remote control unit (1)
(A70-1267-05) : RC-R0708....ETQE1
(A70-1266-05) : RC-R0709....KPMX
Battery cover (A09-1123-08)
Battery cover (A09-1123-08)
Batteries (R06/AA) (2)
*Use to adapt the plug on the power
cord to the shape of the wall outlet.
(Accessory only for regions where use
is necessary.)
Resetting the Microcomputer
If the microcomputer may malfunction (unit cannot be operated,
or shows an erroneous display) if the power cord is unplugged
while the power is ON, or due to some other external factor. If this
happens, execute the following procedure to reset the micro-
computer and return the unit to its normal operating condition.
Unplug the power cord from the wall outlet, then plug it
back in while holding down the POWER key.
· Please note that resetting the microcomputer will clear the contents
of the memory and returns the unit to the state it was in when it left the
factory.
With the power cord plugged in, turn the POWER key
OFF. Then, while holding down the ON/STANDBY key,
press POWER.
For U.S.A. and Canada
For other countries
AR-304/KRF-A4020
2
CONTENTS / ACCESSORIES / CAUTIONS
CONTENTS/ACCESSORIES/CAUTIONS ...................2
CIRCUIT DESCRIPTION .............................................3
ADJUSTMENT ............................................................ 6
WIRING DIAGRAM ......................................................7
PC BOARD ..................................................................8
SCHEMATIC DIAGRAM ............................................11
EXPLODED VIEW .....................................................21
PARTS LIST...............................................................22
SPECIFICATIONS .....................................................28
Contents
Accessories
Cautions
background image
AR-304/KRF-A4020
3
CIRCUIT DESCRIPTION
1. BACK UP DATA AND INITIAL STATE
1-1 BACK UP
(1) AMP
· POWER................................STANDBY
· INPUT SELECTOR ..............TUNER
· BALANCE ............................CENTER
· SPEAKER A RELAY ............ON
· SPEAKER B RELAY ............OFF
· VOLUME LEVEL .................-66dB
· BASS LEVEL .......................0dB
· TREBLE LEVEL ...................0dB
· INPUT LEVEL ......................0dB
· BASS BOOST ......................OFF
· SOURCE DIRECT ...............OFF
· TAPE2/MONITOR ................OFF
· SL16/XS8 .............................SL16
(2) TUNER
· BAND ...................................FM
· PRESET CHANNEL............."- - "
· FREQUENCY.......................LOWER LIMIT VALUE
K1 .................................FM:87.50MHz/AM:530kHz
E1/E3 ............................FM:87.50MHz/AM:531kHz
Q1 .................................FM:65.00MHz/AM:531kHz
· AUTO/MANUAL ...................AUTO
· DISPLAY MODE ..................FREQUENCY
· E ON THRUST RECEIVING ...........OFF
MODE
· T1 VOLUME .........................OFF(-66dB)
1-2 INITIAL SETTING
The initial setting is performed when the AC power cord
is plugged into the AC power wall out let while pressing
the power (STANDBY) key.
3. TEST MODE
3-1 SETTING
Turn the power ON while pressing the [BAND] key.
3-2 CANCELLATION
Unplug the AC power cord from an AC power wall outlet.
3-3 STARTING ACTIVE CONTENTS
1 The power on state is entered when the power is
tuned on while pressing the [BAND] key.
All functions are initialized and activated in the all
lighting mode.
2 All lighting mode is canceled when any main unit's
keys are pressed. The normal display obtained when
the selector is set to TUNER then appears.
3 E2PROM check(E,T,Q,type only).
Check the reading data and the writing data of the
E2PROM after setting the test mode.
Display shows blank if the reading data and writing
data are the same. Display shows "LW" if the different
data will be written to E2PROM.
3-4 ACTIVE CONTENTS
1 The mute control is not activated when the mode is
switched.
2 The test mode will be terminated by plugging it off the
power source or by initializing it when all the settings
will be initialized.
3 During the test mode, it can be operated in a special
manner that is different from an ordinary operation by
using the keys on the remote control or the main
body ,specifically as shown in the following table (3-5
CONTENTS).
4 Channel space will be no changed in the test mode.
3-5 CONTENTS
3-5-1 TUNER FUNCTION
WITH THE SELECTOR ON TUNER (E/T/Q TYPE ONLY)
DESTINA
TION
TUNER
TYPE
BAND
RECEIVING
FREQUENCY
RANGE
CHANNEL
SPACE
IF
PLL
REFERENCE
FREQUENCY
DSW3
(D507)
DSW2
(D505)
DSW1
(D504)
DSWO
(D510)
K,P
K1(1700)
FM
AM
87.5MHz~108.0MHz
530kHz~1700kHz
100kHz
10kHz
+10.7MHz
+450kHz
25kHz
10kHz
0000
M.X
E1
FM
AM
87.5MHz~108.0MHz
531kHz~1602kHz
50kHz
9kHz
+10.7MHz
+450kHz
25kHz
9kHz
0011
M
K2(1600)
FM
AM
87.5MHz~108.0MHz
530kHz~1610kHz
100kHz
10kHz
+10.7MHz
+450kHz
25kHz
10kHz
0001
E,T
E3
RDS
FM
AM
87.5MHz~108.0MHz
531kHz~1602kHz
50kHz
9kHz
+10.7MHz
+450kHz
25kHz
9kHz
0101
Q
Q1
RDS
FML
FMH
AM
65.0MHz~74.0MHz
87.5MHz~108MHz
531kHz~1602kHz
10kHz
50kHz
9kHz
+10.7MHz
+10.7MHz
450kHz
5kHz
5kHz
9kHz
1011
DSW0~DSW3(DIODE SW) * O: NONE DIODE,1:ADD DIODE
2. DESTINATION LIST OF TUNER
OPERATION KEY
FUNCTION
FL DISPLAY
REMARKS
(EX.)
PTY
S LEVEL
(1)(SLEVEL),(RF ATT)OFF
(1)
RF ATT
(2)(SLEVEL),(RF ATT)ON
(2)
(3)
(3)(NORMAL),(RF)ATT OFF
CYCLE
DISPLAY
P.CALL UP
BASS BOOST
P.CALL DOWN
P.CALL FREQUENCY
TA/NEWS
PI CODE
PI 0000
PI CODE ON/OFF
Bass and treble are selected when the sound key is
pressed.
2 Tuned light
3-5-2 AMP FUNCTION
WITH THE SELECTOR ON SOMETHING OTHER THAN
TUNER
1 One touch max,min setting for Audio level.
SOUND KEY
KEY
MASTER VR.
BASS
TREBLE
BAND
-89dB
-10dB
-10dB
AUTO
0dB
+10dB
+10dB
MEMORY
-10dB
0dB
0dB
XS8
SL16
XS8/SL16
TUNED LIGHTS
TUNED LIGHTS
SWITCH
OFF
ON
background image
AR-304/KRF-A4020
4
CIRCUIT DESCRIPTION
4. Microprocessor CXP82840-163Q, CXP82832-162Q (X09, IC51)
4-1 Microprocessor periphery block diagram diagram
FL DISPLAY
ED51
10GRID
16SEGMENT
X8
X3
X2
X2
X2
X2
X09, S516
SERIAL COMMUNICATION
DATA
BUSY
VOLUME
ENCODER
X09, S518
MULTI
ENCODER
X09, S517
SELECTOR
ENCODER
X2
X3
8.0MHz
CE
RESET
X3
X2
TUNER MUTE
AUDIO MUTE
X09, IC52
EEPROM
-10dB ATT
SD
STEREO
KS0~KS7
KR0~KR2
X1
10-BT-216GK
LED
(STANDBY)
POWER RELAY
SPEAKER A RELAY
SPEAKER B RELAY
X09, IC51
X09, IC3
SELECTOR IC
TC9164AN
REMOCON
CXP82840-163Q
(E/T/Q TYPE ONLY)
CXP82832-162Q
(OTHERS)
Receiver
µ
X09, IC54
RDS IC
X05, IC2
TUNER
SAA6579/R
(PHILIPS)
E/T/Q TYPE ONLY
E/T/Q TYPE ONLY
LC72131
X09, IC2
VOLUME IC
M62492FP
X24C02
(XICOR)
KEY
MATRIX
KR0(12)
KR1(13)
KR2(14)
KS0(81)
BASS BOOST
S.DIRECT
BAND
KS1(80)
SPEAKER B
*DIMMER/PTY
*P.CALL UP/DISPLAY
KS2(79)
SPEAKER A
POWER
*P.CALL DOWN/TA NEWS
KS3(78)
-
-
-
KS4(77)
-
-
DSW3(507)
KS5(76)
DSW2(D505)
DSW1(D504)
DSW0(D510)
KS6(75) TAPE2/MONITOR
SOUND
AUTO
KS7(74)
MUTE
BALANCE
MEMORY
PTY,DISPLAY and TA/NEWS keys are only RDS version(E/T/Q).
background image
AR-304/KRF-A4020
5
CIRCUIT DESCRIPTION
Pin No.
Pin name
I/O
Description
Active
1,2
G9,G10
O
FL grid control (9,10).
3
NC
-
Unused.
4
RDS,CK
I
RDS IC clock input control. (E/T/Q type only)
5
RDS,DT
I
RDS IC data input control. (E/T/Q type only)
6
NC
I
Unused.
7
VOL.ENC.A
I
Volume encoder A (CW) signal.
8
REMOCON
I
Remote control signal input.
9
VOL.ENC.B
I
Volume encoder B (CCW) signal.
10,11
NC
-
Unused.
12~14
KR0~KR2
I
Key return (0~2).
15
PROTECT
I
Protection detection signal input.
H: Protection ON
16
S.DATA
I/O
Serial communication data.
17
S.BUSY
I/O
Serial communication busy.
18
E2.DATA
I/O
E2 PROM data.
19
E2.CLK
O
E2 PROM clock.
20
SEL.ENC.A
I
Selector encoder A(CW) input.
21
SEL.ENC.B
I
Selector encoder B(CCW) input.
22
MULTI.ENC.A
I
Multi control encoder A(CW).
23
MULTI.ENC.B
I
Multi control encoder B(CCW).
24
8/16
I
Serial communication 8bit/16bit changeover.
25~27
NC
-
Unused.
28
VDD
-
Analog power supply (+5V).
29
S.LEVEL
I
Signal level A/D input. (E/T/Q type only)
30~32
NC
-
Unused.
33
PLL.DO
I
PLL IC DO signal input. (E/T/Q type only)
34
PLL.ST
I
TUNER stereo signal input.
L: STEREO
35
PLL.SD
I
TUNER SD signal input.
L: TUNED
36
RCV.CE
I
Receiver chip enable signal input.
L: ENABLE
37
AVSS
-
Analog ground.
38
RESET
I
u-Com reset.
39
EXTAL
I
Main clock(8MHZ).
40
XTAL
-
Main clock(8MHZ).
41
VSS
-
u-Com ground.
42
TX
-
Unused.
43
TEX
I
Ground.
44
VDD
-
Analog power supply (+5V).
45
VFDP
-
FL power supply(-33V).
46
SEL.STB
O
TC9164AF strove.
H: LATCH
47
SEL/PLL.DT
O
Selector/PLL IC data signal output.
48
SEL/PLL.CK
O
Selector/PLL IC clock signal output.
49
PLL.CE
O
PLL IC CE signal output.
50
T.MUTE
O
Tuner mute control.
L: MUTE ON
51
A.MUTE
O
Audio mute control.
L: MUTE ON
52
NC
-
Unused.
53
10dB.ATT
O
Volume 10dB attenuator control.
L: ATT ON
54
VOL.DT
O
Volume IC(M62492FP) data control.
55
VOL.CK
O
Volume IC(M62492FP) clock control.
56
VOL.ST
O
Volume IC(M62492FP) strove control.
57~59
NC
-
Unused.
60
RELAY.A
O
SP. relay A control.
H: RELAY ON
61
RELAY.B
O
SP. relay B control.
H: RELAY ON
62,63
NC
-
Unused.
64
POWER.RLY
O
Power relay control.
H: RELAY ON
65
STANDBY.LED
O
STANDBY LED control.
H: LED ON
66~71
NC
-
Unused.
72
LIMITER
O
Output power control at SP. (A+B). K/M/X only.
73
S.W MUTE
-
Unused.
74,75
KS6/KS7
O
Key scan 6,7.
76~81
P1/KS5~P6/KS0
O
FL segment 1~6/key scan 5~0.
82~88
P7~P13
O
FL segment 7~13.
89
VDD
O
u-Com +5V power supply.
90~92
P14~P16
O
FL segment 14~16.
93~100
G1~G8
O
FL GRID 1~8.
4-2 Pin descriptions

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