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Yamaha 505 Service Manual Page 50

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ABCDEFGH
1
2
3
4
5
6
IJKLMNO
7
8
9
10
GX-505/GX-505VCD
■ SCHEMATIC DIAGRAM (GX-505VCD VCD)
* 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.
Point q (Pin59 of IC5)
V : 2V/div H : 50 nsec/div
DC range 1 : 1 probe
Point w (Pin39 of IC8)
V : 2V/div H : 0.1 µsec/div
DC range 1 : 1 probe
IC4 : AN8806SB
Digital Servo Head Amp
36
PDAC
EQ
+
35
PDBD
+
31
PDFR
34
PDF
+
32
PDER
33
PDE
+
+
+
VCBA
+
+
VCBA
29
F.BAL
7
RF OUT
6
RF–
+
27
FEOUT
28
FE–
+
VCBA
+
VCBA
+
+
30
TBAL
+
24
CROSS
+
25
TEOUT
26
TE–
8
RF IN
RF
DETECT
9
C.AGC
AGC
10
ARF
17
RF DET
ENV DETECT
11
C.ENV
12
C.EA
19
ENV
BDO
OFTR
13
C.SBDO
14
BDO
15
C.SBRT
16
OFTR
18
GND
5
VCC
+
23
TEBPF
+
22
VDET
+
20
VREF
1
PD
4
LDP
3
LDON
2
LD
21
LD OFF
–+
OUT
1
–IN
1
–V
CC
+V
CC
OUT
2
1
2
3
4
5
+IN
1
–IN
2
+IN
2
– +
6
7
8
IC13, 14 : µPC4570G2
Dual OP-Amp
IC1 : M56748FP
4 Channel BTL Driver
TSD
STAND
BY
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
36
35
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
25K
23K
10K
10K
15K
15K
10K 10K10K 10K
10K 10K
3.6K
10.8K
VCC
OP1
PA PA
PA PA
PA
PA
PA
PA
OP1
OP1OP1
OP1
OP1 OP1
VREF-IN
VREF-OUT
N. C.
GAIN 1
VCTL 1 (–)
VM 1 (–)
VM 1 (+)
GND
VM 2 (+)
VM 2 (–)
VCTL 2 (–)
GAIN 2
N. C.
VCC
REG 5V
STAND BY
SS. GND
STAND BY
GAIN 4
VCTL 4 (–)
VM 4 (–)
VM 4 (+)
GND
VM 3 (+)
VM 3 (–)
VCTL 3 (OUT)
VCTL 3 (–)
VCTL 3 (+)
VCC
REGBASE
IC2, 3 : TA8409S
Full Bridge Motor Driver
9
2 6
7
3
8
5
1
STAND-BY
CIRCUIT
VREF
CIRCUIT
THERMAL
SHUTDOWN
CIRCUIT
VCC VS
VREF
OUT 1
OUT 2
IN 1
IN 2
GND
IC9, 12 : TC74HC125AF
Quad 3 State Bus Buffers
1A
1Y
1C
Vcc
4C
1
2
3
4
11
2C
4A
4Y
12
13
14
2A
2Y
3C
3A
5
6
7
GND
3Y8
9
10
IC10 : TC74HC04AF
Hex Inverters
1A
1Y
2Y
V
DD
6A
1
2
3
4
11
2A 6Y
5A
12
13
14
3A
3Y
5Y
4A
5
6
7
VSS 4Y8
9
10
IC11 : TC74VHC14F
Hex Schmit Trigger Inverters
V
DD
14
I6
13
O6
12
I5
11
O5
10
I4
9
O4
8
I1
1
O1
2
I2
3
O2
4
I3
5
O3
6
V
SS
7
0V
0V
NO. TERMINAL I/O FUNCTION
1 A+3.3V +3.3V POWER SUPPLY FOR ANALOG VIDEO
2 CVOUT O COMPOSITE VIDEO OUT
3 COUT O C VIDEO OUTPUT (S)
4 YOUT O Y VIDEO OUTPUT (S)
5 VGND ANALOG VIDEO GROUND
6 VGND ANALOG VIDEO GROUND
7 R+5V DIGITAL +5V POWER SUPPLY
8 D+3.3V DIGITAL +3.3V POWER SUPPLY
9 D+3.3V DIGITAL +3.3V POWER SUPPLY
10 DGND DIGITAL GROUND
11 DGND DIGITAL GROUND
12 XCK I AUDIO EXTERNAL FREQUENCY CLOCK
13 EMPH O AUDIO EMPHASIS OUTPUT
14 DILRCK O AUDIO LEFT RIGHT CLOCK
15 HRDY O HOST DATA READY
16 DISCK O AUDIO BIT CLOCK
17 DIDATA O AUDIO DATA SERIAL BUS
18 HINT O HOST INTERRUPT
19 SBCK O SUBCODE CLOCK FOR CD-G
20 VRST I HARDWARE RESET (LOW ACTIVE)
21 HCK I HOST CLOCK
22 HDIO I/O HOST SERIAL DATA BUS
23 CDSCK I CD BIT CLOCK
24 CDDATA I CD DATA
25 CDLRCK I CD LEFT RIGHT CLOCK
26 IPFLG I CD DATA ERROR FLAG (C2P0)
27 HSEL I HOST ADDRESS/DATA SELECT
28 SUBC I SUBCODE DATA FOR CD-G
29 CLDCK I SUBCODE FRAME SYNC FOR CD-G
30 BLKCK I SUBCODE BLOCK SYNC FOR CD-G
CONNECTION TERMINAL SPECIFICATION
NOTE: None of the components of the VCD module can be supplied
separately. Only a VCD module unit (VZ150200) is available.
VCD MODULE (VZ150200)
2. SUBCODE INTERFACE
3. AUDIO OUTPUT INTERFACE
4. HOST INTERFACE
HOST READ TIMING
HOST WRITE TIMING
63
INPUT(2)
P65
D-8
MAIN(1)
P68
A-2
INPUT(1)
P65
A-9
INPUT(2)
P65
E-8
CD HEAD AMP
SPC & DAC
ACT
MOTOR
DRIVE
MOTOR DRIVE
CD CPU
LPF
MUTING
REGULATOR
REGULATOR
CD(Lch)
2.4
2.4
0
1.7
0.6
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
0.1
3.7
4.8
0
4.8
2.4
2.9
2.4
3.6
1.5
3.8
3.1
3.5
1.2
3.5
0
0
0
3.7
4.3
1.8
2.4
2.4
2.1
2.5
0
0
0
2.5
5.6
2.4
5.6
2.4
2.4
2.5
2.7
0
0
0
~
2.4
2.4
2.4
1.3
2.4
4.8
0
0
0
6.1
~
11.1
0
~
4.8
0
0
4.8
~
0
11.1
~
4.0
0
0
6.0
0
0
4.0
2.4
1.3
1.9
4.8
0
0
2.4
2.3
4.8
0
4.8
0.1
2.4
0
0
0
0
2.4
2.4
4.8
1.2
0
0.6
0
0
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
4.3
4.8
0
~
4.8
0
0
0
0
4.8
~
2.4
~
0
4.9
2.3
2.4
2.4
4.8 5.5
8.04.9
7.3
7.3
0
1.2
1.7
1.2
1.2
0
0
0
2.7
0
0
0
0
0
6.2
6.2
6.2
5.6
10.8
4.8
0
4.8
4.8
0
0
4.8
4.8
4.8
0
4.8
4.8
~
~
~
~
4.8
0
0
0
4.8
4.8
0
0
0
~
4.1
4.1
0
0
~
~
4.8
0
0
4.8
0
4.8
0
4.8
0
4.8
4.8
0
0
0
0
0
0
0
0
4.8
0
0
0
0
0
0
0
0
0
0
4.1
0
4.8
4.3
2.1
2.3
0
0
0
0
0
0
0
0
0
4.8
0
0
0
0
0
4.8
0
0
0
0
0
0
0
0
4.8
4.8
4.8
0
0
0
0
0
0
0
0
0
0 4.8
4.8
4.8
4.8
-12.0
0
0
0
-12.1
12.2
0
0
0
0
4.8
0
2.4
2.4
4.8
4.8
4.8
0
0
4.8
00
0
0
0
0
4.8
4.8
0
4.8
4.8
4.8
4.8
q
w
0
5.6
0
0
0
~
5.6
2.4
5.6
5.6
0
0
4.8
12.2
0
0
0
0
0
0
-12.1
0
0
-12.0
0
0
-12.0
0
0
2.4
0
2.4
2.4
4.9
3.2
0
8
3
1
2
6
5
7
4
5
6
3
21
4
14
7
3
7
5
6
3
4
14
2
1
5
4
6
2
1
14
12
13
11
10
9
10
11
9
2
1
89
7
3
8
14
10
11
VCD
8
2
1
3
5
6
7
4
7
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