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A
B
SCHEMATIC DIAGRAM (TUNER)
1
VT (U, C, R, T, L, A, B, G)
VT (J)
87.5MHz
2.0V
76.0MHz
1.76V
FM
98.1MHz
FM
4.1V
83.0MHz
2.9V
108.0MHz
7.1V
90.0MHz
4.14V
531kHz
1.4V
108.0MHZ
7.28V
AM
1080kHz
4.9V
531kHz
1.43V
1611kHz
6.9V
AM
1080kHz
5.03V
1611kHz
7.06V
2
9.1
(0)
0.9
(0)
(0)
0.1
FM
3
4
5
CIRCUIT CHANGES BY MARKET
X : NOT USED
6
7
IC1 : LA1838
AM/FM Tuner
30
29
28
27
26
25
24
23
22
21
20
19
18
17
ALC
REG
AM
DECODER
OSC
ANTI–BIRDIE
AM
AM
BUFF
MIX
RF.AMP
P–DET
STEREO
AGC
ø
SW
SD
AM IF
DET
COMP
MUTE
8
π
VCO
FF
FF
FF
AM
304KHZ
38K
19K
2
19K
0
S–METER
FM
AM/FM
S–CURVE
S–METER
IF–BUFF
TUNING
STEREO
DRIVE
DRIVE
FM
FM IF
DET
GND
VCC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
C
D
E
Each voltage represents the voltage when receiving FM (stereo) signal and the voltage in the parentheses (
FM/AM TUNER
12.2
12.4
(0)
(12.4)
DISCRIMINATOR
0
(12.4)
BALANCE ADJ.
(10.3)
10.1
0
(0)
(0.6)
9.1
AM
12.3
(0.1)
PLL
(0)
0
0
(0)
(0)
(0)
0
12.3
(2.4)
0
0
(12.4)
(0)
2.4
12.3
(0.1)
(4.9)
4.9
(1.0)
1.0
4.9
(0.5)
(1.0)
1.0
4.7
(4.7)
(0.1)
(4.9)
4.1
0.1
(0)
0
0
(0)
(2.4)
2.4
2.3
(2.3)
r
IC2 : LC72131M
PLL Controller
q
XIN
REFERENCE
PHASE DETECTOR
!8
DIVIDER
@2
CHARGE PUMP
XOUT
!9
!6
SWALLOW COUNTER
16
FMIN
1/2
1/16,1/17 4BITS
@0
12BITS
UNLOCK
!5
DETECTOR
AMIN
PROGRAMMABLE
DIVIDER
e
CE
r
DI
PILOT
2
DET
t
C
B
CL
DATA SHIFT REGISTER
UNIVERSAL
!2
I/F
LATCH
COUNTER
DO
y
POWER
!7
VDD
ON
RESET
@1
VSS
u i o !0 !1 !3
15
F
G
) is the voltage when receiving AM signal.
AM
STEREO
DEMODULATOR
(10.1)
0.1
0.5
(4.8)
(0)
12.3
9.1
(0.6)
4.9
12.4
(4.9)
(12.4)
5.6
(5.6)
5.6
(5.6)
0
(0)
TUNER(Lch)
IC4 : LC72720NM
RDS Decoder & Controller
PD
1
5
6
AIN1
VDDA
3
CLOCK
14
VDDD
+
PLL
AOUT1
RECOVERY
REFERENCE
(57kHz)
(1187.5Hz)
VOLTAGE
VSSA
4
15
VSSD
VREF
57kHz
ANTIALIASING
SMOOTHING
DATA
MPX IN
2
RDS-ID
bpf
19
FILTER
FILTER
DECODER
(SCF)
DO
20
CL
21
18
SYNC
RAM
ERROR CORRECTION
SYNC/EC
DI
22
CCB
(24 BLOCK DATA)
(SOFT DECISION)
CONTROLLER
24
SYR
CE
23
IFIN
CLK(4.332MHz)
T1
7
MEMORY
CONTROL
T2
8
TEST
SYNC
SYNC
T3
9
DETECT-1
DETECT-2
OSC/DIVIDER
T4
10
11 16 17
13
12
H
I
PK1 : TFFJ2U515A (V4299000) U, C, R, T, L models
R3
10k
R2
C2
D1
33
3p
C20
J4
TR1
12p
0
ANT
7
L3
C3
C4
L2
C19
OPEN
1200p
C1
2.2µ
56p
24p
L7
L1
ANT
8
C22
R1
C26
OPEN
OPEN
C21
0.01µ
GND
6
100p
PK1 : TFFJ4E515A (VU134500) A, B, G models
R12
100k
R2
C2
D1
33
4p
C20
C25
TR1
D3
4p
6p
ANT
8
L3
C3
L2
2p
2.2µ
C19
L1
OPEN
L7
GND
C1
7
C21
C22
R1
C26
OPEN
680p
1p
100k
0.01µ
GND
6
PK1 : TFFJ2J541A (VV207900) J model
R3
10k
R2
C2
D1
33
5p
C20
J4
TR1
27p
0
ANT
7
L3
C3
C4
L2
C19
10p
680p
C1
2.2µ
68p
22p
L7
L1
ANT
8
C22
R1
C26
RDS
OPEN
OPEN
C21
0.01µ
GND
6
100p
DECODER
t
P-E28/J26
[C-2]
Point r (Pin20 of IC2)
H : 0.1 µsec/div
V : 2V/div
DC range
1 : 1 probe
0V
IC3 : TA2040AF
AM Stereo Demodulator
ST
PILOT
PILOT
PILOT
MODE
TUN
ST
DET
in
out
IND.
IND.
LPF2
SW.
VCC
16
15
14
13
12
11
10
9
ST
LED
PILOT
PHASE
DET
COMP
1/18K
ENVELOPE
ERROR
DET
AMP
I DEM
LIMIT
AMP
VCA
Q DEM
1/8
UNLOCK
IF
PHASE
AGC
MATRIX
VCO
AMP
COMP
1
2
3
4
5
6
7
8
* All voltage are measured with a 10MΩ/V DC electric volt meter.
LOCK
IF
AGC
ROUT
LOUT
LPF1
VCO
GND
* Components having special characteristics are marked Z and
in
must be replaced with parts having specifications equal to those
originally installed.
* Schematic diagram is subject to change without notice.
J
K
RX-E100
J2
0
4
VT
C8
C18
47p
0.01µ
T1
C6
1
IF OUT
C5
TR2
OPEN
4p
2
GND
L4
L5
J3
R4
0
C7
J1
330k
R10
560p
0
180
5
VCC
C23
C24
C27
OPEN
C16
0.01µ
OPEN
R7
R8
18p
R5
R6
100k
100k
180
4.7k
C9
C12
C10
2p
12p
TR4
OPEN
TR3
C15
D2
C13
6p
33p
L6
C14
R9
C11
22p
1.8k
0.01µ
F OUT
3
R11
C17
33
0.01µ
J2
0
4
VT
C8
C18
R3
47p
10k
0.01µ
T1
1
IF OUT
C5
C6
TR2
2p
4p
L5
2
GND
2.2µ
L4
C4
680p
R4
1M
C7
C23
J1
R10
100p
0.01µ
0
150
5
VCC
R8
R14
C24
C27
R13
180
0.01µ
C16
330k
180
OPEN
R7
R5
10p
R6
100k
100k
4.7k
C12
TR4
C10
TR5
12p
OPEN
D2
C9
C13
C15
C28
TR3
2p
33p
33p
18p
L6
C14
R9
C11
1k
22p
0.01µ
3
F OUT
R11
C17
22
0.01µ
J2
0
4
VT
C8
C18
47p
0.01µ
T1
C6
1
IF OUT
C5
TR2
OPEN
10p
2
GND
L4
L5
J3
R4
0
C7
J1
330k
R10
560p
0
180
5
VCC
C23
C24
C27
OPEN
C16
0.01µ
OPEN
R7
R5
R8
18p
R6
100k
180
100k
4.7k
C9
C12
C10
2p
15p
TR4
OPEN
TR3
C15
D2
C13
6p
33p
L6
C14
R9
C11
22p
2.2k
0.01µ
F OUT
3
R11
C17
68
0.01µ
Point t (Pin12 of IC4)
H : 0.1 µsec/div
V : 2V/div
DC range
1 : 1 probe
0V
E-26/J-24
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