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3. BLOCK DIAGRAM AND SCHEMATIC DIAGRAM
3.1 BLOCK DIAGRAM(KEH-P7020R/XN/EW)
A
TUNER AMP UNIT
A
FM/AM TUNER UNIT
CN401
1
28
ANT
2
27
26
B
C
D
14
1
2
FM/AM 1ST IF 10.7MHz
AMRF
T51 Q51 CF51 CF52 CF53
AMANT
ATT
ANT1 ADJ
IC1
MIXER, IF AMP, DET.
FMANT
ATT
RFGND
FMRF
CF202
X901
AM 2ND IF
RF ADJ
10.25MHz
450kHz
VDD
VCC
ANT2 ADJ
LOCH
LOCL
23
25
7
17
20
VCC
VDD
D
CN252
1
FWD
L-ch
5
REV
L-ch
4
CN254
M2
2
M
SUB
1
MOTOR
CN255
M1
M
MAIN
MOTOR
CN256
E
KEH-P7020R
2
3
MPXREF 41kHz
AMDET
L ch
IC 2 FM MPX
R ch
COMP
LDET
IC 3
EEPROM
22
10
19
14
24
9
11
12 15 16
8
13
2
3
4
1
CN101
TEL
DECK UNIT
CN251
Lch
3
6
37
EQ AMP
16 MS
5
36
IC251
f/R
17
6
39
HA12228F
MUTE
20
9
B.U
20
18
19
5
2
11
POS
13
MECHANISM
13
NES
DRIVER
15
14
SC2
16
IC351
15
1
SC1
17
PA2020A
16
CM
18
stby
17
19
8
7
10
LOAD
11
CN253
3
1
5
6
3
1
5
6
EGN1
REEL
SENSE
S1
S2
LOAD
MODE
REEL SENSE PCB
3
4
Q153
Q151
6
Q501
5
RDS
DECODER
24
20
21
IC 501
8
18
PM4009A
11
12
X501
Q402
SWDACC
5
IP-BUS DRIVER
1
5
8
6
HA12187FP
7
11
CN451
BUS-
2
BUS+
FUSE
1
BUS+L
200mA
BUS-L
CN251
BUZZER
3
5
DIRO
6
54
RIMUTE
9
MSIN
33
RIMUTE
55
20
DIRO
BU
58
LOADSW
59
POS
POS
13
61
ES
ES
15
63
SC2
SC2
65 SC1
16
66
SC1
CM
17
68
STBY
CM
18
STBY
SYSTEM CONTROLLER
19
IC 601(2/2)
1
LOADSW
11
36
Q851
BU
Q852
4
Q155
VDD
Q101
BU
Q102
TX
1
IC 101
RX
2
8
IPPW
TUN L
BUS+L
BUS-L
TEL
TAPE L
MIC751
VST,VC
LEVEL IND
24
PEE
94
LVLINL
87
MUTE
23
SYSPW
13
XOUT
X601
15
XIN
PD
44
PD5698B
EJTIN
41
35
40
43
BU
BU
IC 801
DSE
4
2
TC7SET08FU
6
1
IC 851
NJM2360M
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