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Yamaha 505 Service Manual Page 56

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ABCDEFGH
1
2
3
4
5
6
IJKL
7
8
GX-505/GX-505VCD
■ SCHEMATIC DIAGRAM (GX-505/GX-505VCD TUNER)
Each voltage represents the voltage when receiving FM (stereo) signal and the voltage in the parentheses ( ) is the voltage when receiving AM signal.
* All voltage are measured with a 10M
Ω
/V DC electric volt meter.
* Components having special characteristics are marked
Z
and
must be replaced with parts having specifications equal to those
originally installed.
* Schematic diagram is subject to change without notice.
PK1 : TFFJ2U515A (V4299000) U, C, R, T, L models
FM IN
L–OUT
R–OUT
30 29
28
GND VCC
MUTE
ALC REG
AGC
DETAM IF
FM IF
S–CURVE
BUFF
AM
OSC
AM
MIX
FM
DET
AM
RF.AMP
SD
COMP
FM
S–METER
AM
S–METER
TUNING
DRIVE
STEREO
DRIVE
AM/FM
IF–BUFF
27 26 25 24 23 21 2022
DECODER
ANTI–BIRDIE
19 1718 16
1 2
3
4 5 6 7 8 10 119 12 13
P–DET
ø
VCO
304KHZ
FF
38K
STEREO
SW
FF
2
π
19K
FF
0
19K
PILOT
DET
14 15
IC1 : LA1838
AM/FM Tuner
IC2 : LC72131M
PLL Controller
POWER
ON
RESET
XIN
q
!8
PD
AIN1
@2
XOUT
!6
FMIN
AMIN
r
DI
t
CL
y
DO
!7
VDD
@0
AOUT1
!9
!2
IFIN
!5
e
CE
@1
VSS
REFERENCE
DIVIDER
PHASE DETECTOR
CHARGE PUMP
UNLOCK
DETECTOR
UNIVERSAL
COUNTER
SWALLOW COUNTER
1/16,1/17 4BITS
1/2
12BITS
PROGRAMMABLE
DIVIDER
DATA SHIFT REGISTER
LATCH
u
i o !0 !1 !3
C
2
B
I/F
BO1
BO2
BO3
BO4
IO1
IO2
IC4 : LC72720NM
RDS Decoder & Controller
7
4
1
5
3
8
6
2
ANT
VT
IF OUT
GND
VCC
F OUT
ANT
GND
C19
56p
C20
12p
C1
24p
C22
OPEN
R2
33
R3
10k
R5
100k
J3
0
R4
330k
C2
3p
C6
4p
C8
47p
R1
OPEN
C3
OPEN
C5
OPEN
J4
0
TR1
L7 L1
L3
L4 L5
L2
2.2µ
C21
100p
C26
0.01µ
C24
0.01µ
D1
C4
1200p
C7
560p
TR2
T1
TR3
C27
OPEN
C9
2p
L6
C17
0.01µ
R11
33
C10
OPEN
D2
C11
0.01µ
C12
12p
R6
4.7k
C23
OPEN
C16
18p
J1
0
R7
100k
C15
6p
TR4
C13
33p
C14
22p
R9
1.8k
R10
180
C18
0.01µ
J2
0
R8
180
PK1 : TFFJ4E515A (VU134500) A, B, G models
8
4
1
5
3
7
6
2
ANT
VT
IF OUT
GND
VCC
F OUT
GND
GND
C19
OPEN
C21
OPEN
C22
680p
R2
33
R3
10k
R12
100k
R5
100k
R4
1M
C2
4p
C25
6p
C20
4p
C6
4p
C8
47p
R1
100k
C3
2p
C5
2p
TR1
L7
L3
L1
L4
L5
2.2µ
L2
2.2µ
C26
0.01µ
C1
1p
C24
0.01µ
D1
D3
C4
680p
C7
100p
TR2
T1
TR3
C27
OPEN
C9
2p
L6
C17
0.01µ
R11
22
C10
OPEN
D2
C11
0.01µ
C12
12p
R6
4.7k
C23
0.01µ
C16
10p
J1
0
R7
100k
C15
33p
C28
18p
TR4
TR5
C13
33p
C14
22p
R9
1k
R10
150
C18
0.01µ
J2
0
R8
180
R13
330k
R14
180
PK1 : TFFJ2J541A (VV207900) J model
7
4
1
5
3
8
6
2
ANT
VT
IF OUT
GND
VCC
F OUT
ANT
GND
C19
68p
C20
27p
C1
22p
C22
OPEN
R2
33
R3
10k
R5
100k
J3
0
R4
330k
C2
5p
C6
10p
C8
47p
R1
OPEN
C3
10p
C5
OPEN
J4
0
TR1
L7 L1
L3
L4 L5
L2
2.2µ
C21
100p
C26
0.01µ
C24
0.01µ
D1
C4
680p
C7
560p
TR2
T1
TR3
C27
OPEN
C9
2p
L6
C17
0.01µ
R11
68
C10
OPEN
D2
C11
0.01µ
C12
15p
R6
4.7k
C23
OPEN
C16
18p
J1
0
R7
100k
C15
6p
TR4
C13
33p
C14
22p
R9
2.2k
R10
180
C18
0.01µ
J2
0
R8
180
+
REFERENCE
VOLTAGE
57kHz
bpf
(SCF)
CCB
TEST
PLL
(57kHz)
ANTIALIASING
FILTER
SMOOTHING
FILTER
RAM
(24 BLOCK DATA)
ERROR CORRECTION
(SOFT DECISION)
SYNC/EC
CONTROLLER
SYNC
DETECT-1
DATA
DECODER
CLOCK
RECOVERY
(1187.5Hz)
MEMORY
CONTROL
OSC/DIVIDER
VREF
CLK(4.332MHz)
SYNC
DETECT-2
VDDA
VSSD
VDDD
RDS-ID
SYNC
SYR
VSSA
MPX IN
DO
CL
DI
CE
T1
T2
T3
T4
T5
T6
T7
X IN
VREF
FL OUT
C IN
X OUT
3
14
15
19
18
24
1 5 6
4
2
20
21
22
23
7
8
9
10
11 16 17 13 12
16
15 14 13 12 11 10 9
1
2
3
4 5 6 7 8
UNLOCK
IF
AMP
AGC
VCO
1/8
VCA
1/18K
ST
LED
PILOT
DET
LIMIT
AMP
PILOT
DET
LPF2
PILOT
in
PILOT
out
MODE
SW.
ST
TUN
IND.
ST
IND.
VCC
LOCK
IF
in
AGC ROUT LOUT LPF1 VCO GND
PHASE
COMP
ENVELOPE
DET
ERROR
AMP
I DEM
Q DEM
PHASE
COMP
MATRIX
IC3 : TA2040AF
AM Stereo Demodulator
Point u (Pin12 of IC4)
V : 2V/div H : 0.1 µsec/div
DC range 1 : 1 probe
Point y (Pin20 of IC2)
V : 2V/div H : 0.1 µsec/div
DC range 1 : 1 probe
0V
0V
RDS
DECODER
AM
STEREO
DEMODULATOR
FM/AM TUNER
PLL
AM
FM
TUNER(Lch)
0.9
9.1
10.1
0
12.2 12.4
0
0.1
3.5
10.1
3.5
3.5
0
2.0
3.5
3.5
3.6
3.6
0
0.1
3.1
2.8
3.3
3.3
4.2
4.2
4.2
4.2
0
0.1
4.3
0
3.7
9.0
9.1
10.1
2.3
1.4
9.1 12.3
0.5
0.1
9.112.3
4.9 12.4
5.6
5.6
0
0
0
0
2.4
4.9
1.0
1.0
4.1
0
2.4
12.3
0
12.3
4.9
4.7
0.1
0
2.3
0
y
0
0
0.1
4.7
4.9
2.4
2.4
4.8
0
2.4
2.4
0
0
2.4
2.3
4.8
0
u
VT
87.5MHz
98.1MHz
108.0MHz
2.0V
4.1V
7.1V
531kHz
1080kHz
1611kHz
1.4V
4.9V
6.9V
FM
AM
(
0
)
(
0
)
(
0
)
(
12.4
)
(
0.1
)
(
0.5
)
(
4.7
)
(
0.1
)
(
0
)
(
2.3
)
(
0
)
(
2.4
)
(
0
)
(
4.9
)
(
1.0
)
(
1.0
)
(
4.9
)
(
0
)
(
2.4
)
(0)
(0)
(0)
(0)
(10.3)
(12.4)
(0) (12.4)
(3.5)
(1.9)
(3.5)
(3.5)
(3.5)
(3.5)
(1.2)
(1.3)
(3.1)
(2.8)
(3.2)
(3.2)
(4.2)
(4.2)
(4.2)
(4.2)
(10.3)
(3.5)
(3.5)
(0)
(0)
(10.1)
(10.3)
(2.6)
(1.4)
(0)
(2.6)
(0)
(6.0)
(5.9)
(0.6)
(0)
(10.1)
(4.8)
(0)
(2.4)
(2.4)
(4.8)
(0)
(2.4)
(0)
(0)
(2.4)
(0)
(4.8)
(2.3)
(0)
(0)
(4.7)
(0.1)
(5.6)
(0)
(5.6)
(12.4)
(4.9)
(0.1)
(0.6)
CIRCUIT CHANGES BY MARKET.
X : NOT USED
V429900
V429900
4.3K
4.3K
69
P64 A-8
P65 A-8
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