Yamaha MCX-1000 Service Manual page 72

A B
MCX-1000
SCHEMATIC DIAGRAM (OPERATION 2/3)
1
FL
DISPLAY
-22.6
2
-22.6
-22.6
-27.6
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~ ~
~ ~
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~
~ -27.6
~ ~
~ -27.6
3
~ ~
-27.6
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~
~ ~
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~
~ ~
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~
-27.6
~
-27.6
-27.6 ~
~ ~
4
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
~ ~
-27.6
~
~ -27.6
~ -27.6
~
5 -27.6
~ -27.6
~ ~
~ ~
~ ~
~
~
~ ~
~ ~
~ -26.3
~
~
~ ~
~ ~
-27.7
~
6 -27.7
~
-27.7
-27.7
~
~
-27.7
-22.6
-22.6
-22.6
7
IC100, 101: M66005-0141AFP-280
FL Display Driver
Display code RAM
(Bank 1: 8-bit x 16) CGROM
51 SEG00
(Bank 2: 8-bit x 64) (35 bit x 160)
Segment 25 SEG26
Code
write output
23 SEG27
circuit
CGRAM
CS 6 Serial dot data 16 SEG34
data (35 bit x 16)
write
receive
SCK 7
Code/
circuit
SDATA 8
command
SEG35
control 15
circuit
DIG12/
56
SEG36
Segment
8 DIG13/
digit 55
SEG37
select/
code
DIG14/
output 54
select SEG38
circuit
DIG15/
53
XIN 13 SEG39
Clock Display
timing
generator clock controller scan pulse
XOUT 12
4 DIG00
Digit
RESET 5 output
circuit
Vcc1
11
57 DIG11
Vcc2 52
Vss 14
2
Vp 24 10 P0
9 P1
9
72
C D E
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3.3
3.3
3.3
0
0.2
3.2
1.7
0
0
-27.7
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~
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-25.0
FL DRIVER
~
~
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3.3
-16.1
3.3
3.3
3.3
0.2
1.8
3.3
1.5
0
0
-27.6
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~
~
~
~
~
-26.3
~
-25.0
F G
4.9 4.9
4.9 0
4.8 0.3
~
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~
3.3
~
-27.6
-27.6
-27.6
2.0 0.3
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0
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OPERATION (2)
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OPERATION (3)
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3.3
-27.6
-27.6
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-27.6
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-27.6
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-27.6
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-16.1
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OPERATION (1)
H I J
4.8
4.9
0
All voltages are measured with a 10MΩ/V DC electronic voltmeter.
Components having special characteristics are marked s and must be replaced
with parts having specifications equal to those originally installed.
Schematic diagram is subject to change without notice.
K L