Kenwood KRFA 4020 Service Manual

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AR7304/KRF7A4020(K) COVER1,1( 99.10.26 5:20 PM «3? 2 K \

11138212033121320/ KENWOOD

A4020 E/A4020W

SERVICE MANUAL

© 1999-1/851-5501-00 (K/K) 3390

Indicator KHOb Front glass Knob Panel Knob
(B1 2-0334-14) (K29-7385-12) (1310-3475-02) (K29-7310-03) (Ase-158501) (K29-7306-14)

KENWOOD badge
(843-0302-04)

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Knob Phone jack (3P) Knob Knob Foot
(K272185041 (E1 1-0295-05) (K29-7365-12) (K29-7307-14) (J02-1167-03)

AC power cord

11230-259245)
Slide switch Metallic cabinet Miniature phone jack Slide switch Power cord bushing
(362-0034-05) (Ao1-3533-01) (E11-0347-05) (862-0001-05) (J42-0083-05)

Phono jack Phono jack AC outlet
(E63-0068-15) (E63-1016-05) (an-o149-05)
Lock terminal board Phono jack Slide switch Lock terminal board
(E70-0080-05) (E63-O173-05) (362-0034-05) (E70-0068-05)

Illustration is KRF-A4020 Mtype.

Please check the tuner PCB number before change 042,43 and X1 with new one .

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AR7304/KRF7A4020(K) COVER1,1( 99.10.26 5:20 PM \°~/ 3

AR-304/ KR F-A4020

CONTENTS / ACCESSORIES / CAUTIONS

Contents
CONTENTS/ACCESSORIES/CAUTIONS ...................
CIRCUIT DESCRIPTION
ADJUSTMENT ...............
WIRING DIAGRAM ..
PC BOARD ..............

'oo'xlou'corx)

Accessories

SCHEMATIC DIAGRAM ............................................ 11
EXPLODED VIEW ..

PARTS LIST ............ ..
SPECIFICATIONS ..................................................... 28

f N
FM indoor antenna (1) .- -AM loop antenna (1) (TQO-OBSS-OS) --------- I AC plug adaptor (1)
(T90-0836-05) : L 1 t d (1) : (E03-0115-05)
, oop an enna s an
(g I (J19-3645-05) I ,-
l : I
I I
. ' ' *Use to adapt the plug on the power
Battenes (ROS/AA) I2) I I cord to the shape of the wall outlet.
I I (Accessory onlyfor regions where use
' ' is necessary.)
Remote control unit (1)
(A70-1267-05) : RC-FI0708....ETQE1 Battery cover (A09-1123-08)
a a C A E z
a a 3 S :2 °
Uflflflflfi :wcp.
o a 25 *= " a
, l- >
a a 4
8 {I U D '02te Z 50 EE] 3%
B 5- EE] E E E2
35 s x x "' .
= n :> a ... .. E 0 o
2 {I D D {1550: at] :U :U
DOUBT]; ° 3050.0:
,4 q h o 3 I:
I E0 50 g 2 =
s V .n -
Remote control unit 1)
(A70-1266-05) : Rc-Ro709....KPMX Battery cover (A09-1123-08)
5 2 g A g \g a
I] EC] TWO 20 = :50 :0 ED .
U. I7
O u: m I g l E D a 6 m
o «t 5&1 a g u E 2
3 8? =0 3 5 e
a :6 2 .5 x 0 I
= A _. u 0
E U U I] {13:05 at] 20
M E g g- z E
DOUBT]; 00 °
q s c 2 Z
I 50 50 a g
2 v u. u
k )
Cautions
Resetting the Microcomputer
It the microcomputer may malfunction (unit cannot be operated, For other countries
or shows an erroneous display) it the power cord is unplugged . .
while the power )5 ON,or dueto some other external factor. II this With the poweI cord PIUQQEd ln tum the POWER key
happens, execute the following procedure to reset the mIcro- OFF' Then, Wh'le hOIdmg down the ON/STANDBY key,
computer and return the unit to its normal operating condition. Press POWER-
For U'S'A' and Canada - Please note that resetting the microcomputer will clear the contents
Unplug the power cord from the wan outlet, then plug n ofthememoryand returnsthe unittothestateItwasinwhenitlettthe
back in while holding down the POWER key. mow-