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Yamaha 505 Service Manual Page 51

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ABCDEFGH
1
2
3
4
5
6
IJKLMN
7
8
9
10
GX-505/GX-505VCD
■ SCHEMATIC DIAGRAM (GX-505 INPUT)
The voltages are measured by LH tape at PLAY mode (no-signal condition)
Only the voitages ( ) are at CD REC mode.
● DOLBY NR OFF
* 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.
IC3 : TC4052BF
Dual 4 Channel Analog Multiplexers/Demultiplexers
INHIBIT
0
0
0
0
1
B
0
0
1
1
X
A
0
1
0
1
X
0x, 0y
1x, 1y
2x, 2y
3x, 3y
NONE
IC7 : LC75393E
Electronic Volume Control
CCB BUS INTERFACE
DECODER + LATCHES
RSBC2
RHP1
RHP2
RRECOUT10
RRECIN10
RRECOUT1
RCOM1
RH
RF2C1
RF2C2
RF2C3
RF1C1
RF1C2
RF1C3
RTIN
RSVROUT
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
LSBC2
LHP1
LHP2
LRECOUT10
LRECIN10
LRECOUT1
LCOM1
LH
LF2C1
LF2C2
LF2C3
LF1C1
LF1C2
LF1C3
LTIN
LSVROUT
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
RSBC1
RCOM2
R1dBOUT
R10dBIN
R10dBOUT
RVSS
CE
DI
CL
DVSS
LVSS
L10dBOUT
L10dBIN
L1dBOUT
LCOM2
LSBC1
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
VCOFF
VCON
DIRECT PASS
DIRECT PASS
VCOFF
VCON
RSVRIN
RVCOUT
VDD
RVref1
RVref2
RIN
VC4
VC3
VC2
VC1
LIN
LVref2
LVref1
MICIN
LVCOUT
LSVRIN
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
IC5 : µPD4066BG
Quad Analog Switch/Multiplexer
SW
A
IN/OUT
1
OUT/IN
2
OUT/IN
3
IN/OUT
4
CONT B
5
CONT C
6
VSS
7
14
VDD
13
CONT A
12
CONT D
11
IN/OUT
10
OUT/IN
9
OUT/IN
8
IN/OUT
SW
D
SW
B
SW
C
SIG/A
SIG/B
SIG/D
SIG/C
16
VDD
6
INHIBIT
10
A
9
B
8
VSS
7
VEE
12
X0
14
X1
15
X2
11
X3
1
Y0
5
Y1
2
Y2
4
Y3
LEVEL
CONVERTER
BINARY TO 1-OF-4
DECODER WITH INHIBIT
SW
SW
SW
SW
SW
SW
SW
SW
13
X
3
Y
IC10 : BA15218N
Dual OP-Amp
–IN
1
2
+IN
1
3
–V
CC
4
+IN
2
5
–IN
2
6
OUT
2
7
+V
CC
8
OUT
1
1
–
+
–
+
IC1 : LB1641
Motor Driver
23
P1
5
IN 1
1
GND
4
VZ
6
IN 2
OUT 1
8
VCC 2
10
OUT 2
9
P2
INPUT LOGIC
PRE DRIVER
7
VCC 1
IC2 : µPC1330HA
2 ch Head Selector Switch
INVERTER
COMPARATOR
1
SWR 1
2
GND
3
SWP 1
4
CONT
5
GND
6
VCC
9
SWR 2
8
GND
7
SWP 2
105Hz
BPF
VREF
BIAS
340Hz
BPF
1kHz
BPF
3.4kHz
BPF
DIF
10.5kHz
BPF
PEAK
HOLD
PEAK
HOLD
PEAK
HOLD
PEAK
HOLD
PEAK
HOLD
RES
RES
RES
RES
MPX
DEC
RES
REFFERENCE
CURRENT
6
7
8
9
5
4
3
2
1
13
12
11
10
14
15
16
17
18
BIASC
VREFC
BREF
N. C.
N. C.
DIF OUT
C IN
A IN
VCC
GND
A OUT
TEST
N. C.
N. C.
SEL
C
B
A
A – C
C
A
IC26 : BA3835S
5-Band BPF and Peak Hold for Spectrum Analyzer
IC9, 11, 21 :
µPC4570G2
Dual OP-Amp
–+
OUT
1
–IN
1
–V
CC
+V
CC
OUT
2
1
2
3
4
5
+IN
1
–IN
2
+IN
2
– +
6
7
8
IC6 : CXA1897Q
Dolby B-Type Noise Reduction System with Recording/Playback
Equalizer
17
222019
REC EQ
CTL
REC EQ
CTL
GND
D PB IN1
NRSW
GND
AGC OUT1
VCC
10K
40K
10dB
AMP
IREF MUTE
36
D TC1
DR OUT1
REC IN1
DECK AB
A EQ
B EQ
REC OUT1
REC OUT2
SPEED
FP CAL
GP CAL
REC IN2
DR OUT2
VCC
RFC
AMS OUT
AMS GAIN
35
34
32
30
29
27
26
25
12
24
D REC IN1
D IREF
GND
31
NR
D L OUT2
NR
AMS
18 2115 1613 14
4546
48 47
REC
EQ
REC
EQ
11
10
9
8
7
6
AGC
IREF
AGC IN1
D PBIN2
MODE
AGC OUT2
D TC2
GND
IREF
VG
AGC TC
D REC IN2
REC MUTE
D L OUT2
AGC IN2
10K
40K
10dB
AMP
5
4
33
3
2
1
44 43
GND
PB OUTB1
PB OUTA1
PB FB21
PB FB11
PB INB1
PB INA1
PB INA2
PB INB2
PB FB12
PB FB22
PB OUTA2
PB OUTB2
GND
GND
41 39 37
GND
GND
23
3840
28
42
Point e (Pin37 of IC8)
V : 2V/div H : 20 µsec/div
DC range 1 : 1 probe
Point r (Pin39 of IC8)
V : 2V/div H : 50 µsec/div
DC range 1 : 1 probe
Point t
CH1 : Collector of Q19
CH2 : Anode of D11
H : 2 sec/div DC range 1 : 1 probe
V : 2V/div (CH1)
V : 2V/div (CH2)
(This waveform is not available by pushing the power switch ON and OFF.)
CH 1
CH 2
With the POWER ON,
disconnect the A/C power
cord. Reconnect the A/C
power cord and the above
waveforms will start.
Disconnect the power
cord from the AC
outlet.
0V
0V
1
2
3
4
5
6
7
8
9
10
11
12
13
1. R
•
REC
2. METAL
3. F
•
REC
4. CASS IN
5. C
rO2
6. +SOL
7. SENSOR OUT
8. +5V SENSOR
9. PLAY SW
10. +MTR
11. –COM
12. MTR SPEED B
13. MTR SPEED A
MAIN PCB
–
+
B
A
MABUCHI
MTR
MECHA CHASSISPH TYPE (JST)
SOL
1
2
3
4
5
1. LOAD OUT (+)
2. LOAD IN (+)
3. LOAD OUT
4. COM
5. LOAD IN
LOADING PCB
PH TYPE (JST)
MTR
+
1. Lch
R / P HD
PH CONNECTOR
–
+
–
+
L
R
E HD
+
2. Lch
–
3. Rch
–
4. Rch
+
5. E
–
6. E
+
64
INPUT SELECTOR
MOTOR
DRIVE
MECHANISM
CONTROL
BIAS OSC
RESET
MAIN CPU
SPECTRUM
ANALYZER
REGULATOR
REGULATOR
PRE
AMP
MUTING
REGULATOR
MUTING
BUFFER
TONE
AMP
ELECTRONIC
VOLUME
CONTROL
HEAD EQ AMP
DOLBY B-TYPE
PROCESSOR
REC/PB
SW
TUNER
CD
TAPE
PB
0
0
0
7.9
0
0
0
0
0
~
~
0
0
0
0
0
0
0
0
0.7
12.2
12.2
11.6
12.2
12.2
12.2
12.2
TAPE SPEED ADJ.
BIAS ADJ.
(Lch)
BIAS ADJ.
(Lch)
0
0
0
4.9
4.7
0
0
0
0
23.3
0
0
00
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
2.4
7.3
4.3
4.2
1.2
0
0
2.5
2.4
4.2
4.2
4.2
1.3
1.3
2.6
2.6
1.2
4.2
4.2
4.2
4.2
4.3
0.3
8.8
4.2
2.6
4.2
3.6
3.6
PB LEVEL ADJ.
(Lch)
REC LEVEL ADJ.
(Rch)
REC LEVEL ADJ.(Lch)
0.3
4.2
2.6
4.2
4.2
4.2
4.2
4.3
2.5
4.2
8.4
8.4
PB LEVEL ADJ.
(Rch)
0.7
0.5
12.4
12.4
0
0
0.5
0.7
1.0
0
0
8.9
8.9
8.9
8.9
4.7
0
0
0
0
0
0
4.7
8.9
-9.2
9.2
9.2
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
-9.3
4.7
8.9
-9.3
8.9
8.9
4.4
8.9
4.4
4.4
4.4
4.4
4.3
0
4.6
4.4
4.3
4.3
4.4
4.4
4.4
4.3
0
0
4.4
4.3
4.2
4.3
4.2
4.4
4.4
4.3
4.2
4.4
4.2
4.2
4.4
4.1
4.1
4.3
4.4
4.3
4.3
4.2
4.4
4.4
4.4
4.4
4.4
12.3
0
0
0
0
0
0
-11.9
0
4.9
0
4.9
4.9
4.7
4.5
4.7
4.7
4.7
4.7
4.7
4.7
4.7
2.6
0
0
4.7
4.7
4.1
4.1
4.9
0.8
4.9
4.9
4.9
4.9
4.9
1.0
4.6
1.9
4.7
4.5
4.7
4.7
4.7
4.7
4.7
4.7
4.7
2.1
4.7
4.7
4.6
4.9
4.9
5.5
5.5
4.7
4.7
0
-0.5
0
0
0
0
0
0
0
0
4.7
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1.9
0
4.7
0
0
4.6
0
3.9
4.7
3.0
1.2
1.8
1.7
2.3
2.0
2.3
1.9
4.7
4.9
4.9
0.9
0.8
0.2
1.7
1.8
3.0
1.2
2.4
4.8
2.4
1.4
2.4
2.4
0
0
5.5
8.9
-12.2
-6.1
12.3
-6.1
4.7
5.5
4.9
8.9
9.6
9.6
0
-6.1
5.5
12.3
12.4
5.5
2.1
4.3
0
0
0
0
0
0
0
0
0
0
0
0
12.4
9.5
9.5
0
8.7
6.2
6.2
0
0
0
0
0
0
0.7
-12.1
5.4
12.3
0
0
0
5.4
2.6
0
~
0
0.1
r
e
t
0
0
0
0
0
8.9
-9.2
(
8.0
)
(
4.0
)
0 (
0.2
)
(
0.1
)
(
11.0
)
(
4.6
)
(
0
)
(
0
)
0 (
5.5
)
0 (
0
)
(
4.6
)
(
4.9
)
(
11.6
)
(
5.5
)
(
21.4
)
(
11.6
)
(
11.6
)
(
0
)
(
11.0
)
(
1.5
)
(
4.7
)
(
0
)
(
0
)
(
4.7
)
(
0
)
(
0.7
)
(
4.7
)
(-
0.5
)
(
4.7
)
(
0
)
(
0
)
0
9.2
9.2
0
0 (
0
)
8.8
-0.7
(-
0.7
)
0
(0)
3.0
0
1.9
0
5.5
4.9
4.7 (0)
4.3
0
4.4
0
0
4.4
14
7
INPUT (3)
INPUT (1)
CASS IN CASS
CASS
CASS
CIRCUIT CHANGES BY MARKET.
X : NOT USED
SAME
PAGE
M-8
SAME
PAGE
M-9
SAME
PAGE
N-8
P69
I-5
P62
L-2
SAME
PAGE
K-6
P62
L-3
P66
D-5
P66
H-7
SAME
PAGE
B-9
P68
A-3
P68
H-7
P68
A-4
P66
F-1
SAME
PAGE
A-7
SAME
PAGE
A-5
SAME
PAGE
A-6
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