Yamaha DISKLAVIER MX1Z Service Manual page 38

A B C
MX1Z OVERALL CIRCUIT DIAGRAM 2/3 ( DRIVE A, DRIVE B, DRIVE C, PK-CTL, PEDAL DRIVE, PEDAL SENSOR, CTRL IN, PWB )
1
DRIVE C
TRANSISTOR ARRAY
2
VN588400
3
4
5
6
7
PWB
8
9
[G]
I n t e r c h a n g e a b l e P a r t s a t M a n u f a c t u r e - S t a g e
10
POWER SUPPLY ASSEMBLY
11
MAINS
ON/OFF
TO SERVICE PERSONNEL
Critical Components Information
Components having special characteristics are marked
and must be replaced with parts having specifications
MAIN POWER SWITCH equel to those originally installed.
12
Note: See parts list for details of circuit board component parts.
MX1Z
A B C
D E F G
DRIVE B
TRANSISTOR ARRAY
YM3421-F
PWM GENERATOR
VN588300
6
PLAY OFF PLAY ON
REGULATOR
NJM78M20FA (XK742A00)
REGULATOR +20V
3
2
! 1
1: OUTPUT
2: COMMON
3: INPUT
D E F G
H I J
DRIVE A
YM3421-F
PWM GENERATOR
PEDAL DRIVE
GND
GND
+HV
+HV
+HV
CB5
VHIS
PEDAL SENSOR
H I J
K L M
TRANSISTOR ARRAY
VN588200
PK-CTL
PHOTO COUPLER
CPU
to CONTROLLER-CN101
to HAMMER SENSOR-CN1
REGULATOR +5V
N.C.
CTRL IN
VT836500
0
K L M
N O P Q
MX1Z
DRIVE A
TRANSISTOR ARRAY
YM3421-F
PWM GENERATOR
VN588200
MASK ROM 4M PS RAM 256K EEP ROM 64K
SINGLE
SHOT
GATE ARRAY
OP AMP
RESET
V4829500
MX1Z
N O P
Q
1
2
3
4
5
6
7
8
9
10
11
12