Yamaha Disklavier Silent Mark III Service Manual page 126

A B C
DU1A OVERALL CIRCUIT DIAGRAM 2/5 (CONTROLLER, PASW, CD PANEL)
1
(CTRL)
CONTROLLER
2
3
CPU
4
5
Photo Coupler
6
IN
MIDI
OUT
INVERTER
7
to DSP-CN1
Photo Coupler
8
FG
1
6
2
11 1 3
4 INVERTER
5
6 Photo Coupler
7
8
9
10
10 11
12
15 5
13
14
15
TO CONTROL
9 CABLE
FOR PIANO
Photo Coupler
REGULATOR +5V
10
HOST SELECT
TO HOST
INVERTER
11
LINE DRIVER
12
DU1A
A B C
D E F G
OR
FLASH ROM 16M
SYSTEM RESET
DRAM 16M
INVERTER
DECODER
SINGLE SHOT
INVERTER
DECODER
B. COUNTER
D E F G
H I J
REGULATOR +3.3V
OR
BUFFER
FLASH ROM 128M
DFF
BUFFER
OR
FDC
CPU
TRANSISTOR ARRAY
D-FF
OR
EXP. I/O
TIMER Adjustment
H I J
K L M
OR
D-FF
LCD DRIVE
BUFFER
PASW
INVERTER
to SPEAKER
CLOCK
N.C
: Ceramic Capacitor
V807830
K L M
N O P Q
DU1A
LCD
CONTROL UNIT DKC55RCD
G E N E R A L
FDD
STANDBY/ON
CN1
Pin No. FUNCTION
REW
FWD
V379590
CD PANEL
DRIVE
SELECT L SELECT R
V525520
DRIVE SELECT
CD-ROM PANEL
Note : See parts list for details of circuit board
component parts
WARNING
Components having special characteristics are marked
and must be replaced with parts having specifications equel
to those originally installed.
DU1A
N O P Q
1
2
3
4
5
6
7
8
9
10
11
12