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Yamaha 505 Service Manual Page 53

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ABCDEFGH
1
2
3
4
5
6
IJK
7
8
GX-505/GX-505VCD
■ SCHEMATIC DIAGRAM (GX-505 OPERATION)
* 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.
IC807 : µPC4570HA
Dual OP-Amp
V
O1
2
–Vm
1
3
+Vm
1
4
V
EE
5
+Vm
2
6
–Vm
2
7
V
O2
8
V
CC
9
V
CC
1
1
–+
–+
2
IC804 : YSS247-D
YMERSION
AIL
CL
FCL
FOL
WL
TA L
TBL
AOL
AIR
AVDD
VREF
SW
AVSS
FOR
WR
TA R
TBR
AOR
VREF
LOGIC
COMPARATORS
TO SWITCHES
11
14
17
13
15
8 3
2
1
24
23 22
12
5
20
19 18
+1
+1
SWITCH SWITCH
SWITCHFILTER
FILTER
YMERSION TONE CONTROL
–1
SWITCH
SWITCH
SWITCH
–1
+1
+1
CR
FCR
10 7
6
IC803 : M66004MASP
FL Driver
P1
18
17
DISPLAY
CONTROL
REGISTER
OUTPUT
PORT
(2BIT)
SERIAL
RECEIVE
CIRCUIT
DIGITAL
OUTPUT
CIRCUIT
DISPLAY
CONTROLLER
CLOCK
GENERATOR
P0
XOUT
20
XIN
21
CS
14
SCK
15
SDATA
16
RESET
13
DIG00
12
61
DIG15
DIG12
64
1
DIG11
SEG00
59
23
SEG35
SEG27
31
33
SEG26
SEGMENT
OUTPUT
CIRCUIT
DISPLAY CODE
REGISTER
(8BITx16)
CGROM
(35BITx160)
DECODER
CGRAM
(35BITx16)
DECODER
CODE
SELECT
CODE
WRITE
RAM
WRITE
CORD/
COMMAND
CONTROL
CIRCUIT
66
P64
H-2
P64
G-9
P64
H-9
IC802 : BU2092
Serial In/Parallel Out Driver
CONTROL
CIRCUIT
OUTPUT BUFFER (OPEN DRAIN)
128BIT STRAGE RESISTER
128BIT SHIFT RESISTER
10
11
12
13
14
15
16
17
18
VSS
DATA
CLOCK
LCK
Q0
Q1
Q2
Q3
Q4
VDD
OE
Q11
Q10
Q9
Q8
Q7
Q6
Q5
1
2
3
4
5
6
7
8
9
MUTING
BUFFER
YMERSION
FL
DRIVER
LED DRIVER
2.4
2.4
2.4
2.4
2.4
2.4
2.4
0
4.9
1.6
0
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
2.4
0
0
0.9
4.9
4.8
0.6
0
0
0
0
0
0
0
0
0
0
0
12.9
12.3
4.9
-6.1
-6.1
-11.9
0
4.9
4.9
-27.4
-22.0
-25.4
-25.4
-25.4
-25.4
-25.4
4.5
-25.4
-25.4
-25.4
-25.4
-25.4
-25.5
-25.5
-25.5
-25.5
4.1
3.8
0.1
-27.2
~
~
~
~
~
~
~
4.6
4.5
2.1
2.1
-27.4
0
-25.4
-25.4
-21.5
-21.5
-25.5
-25.5
-25.5
-25.5
-25.4
-25.4
-25.4
-25.4
-25.4
-25.4
-25.4
-25.4
-25.4
-25.4
-25.4
-25.4
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
~
-27.2
-21.5
-21.5
3.7
4.9
3.7
4.9
3.6
5.8
8.0
10.2
12.4
3.6
5.8
8.0
10.2
12.4
5.1
6.9
8.7
10.6
12.4
3.6
5.8
8.0
10.2
12.4
5.1
0.2
0.4
3.7
0.4
0.4
4.9
0
3.7
5.2
4.3
4.3
4.7
4.3
5.2
0
0.1
4.6
4.2
6.3
8.3
10.3
12.3
4.2
6.3
8.3
10.3
12.3
5.2
7.0
8.7
10.7
12.3
4.3
6.3
8.3
10.3
12.3
3
1
2
8
5
4
6
7
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