Yamaha P-250 Service Manual page 84

B
A C
P-250 OVERALL CIRCUIT DIAGRAM 1/4 (DM)
1
DM
2
to PNR-CN91
to PNR-CN92
3
to DJK-CN5
4
to DJK-CN1
to PJK-CN11
5
to PNL-CN101,
PN-EQ-CN10,
GHD EBUS L-CN1
to DJK-CN6
USB
CONTROLLER
6
to DJK-CN8
7
to MA60-CN3
8
9
SDRAM 64M
10
SWP50
11
12
28CC1-8823074
8
P-250
A B C
F
D E G
BUFFER
BUFFER
OR
INVERTER
SWP50
Note: See parts list for details of circuit board component parts.
D E F G
H I J K
RESET
to PJK-CN10
CPU
to WML-CN1
SWP50
to WMH-CN1
H I J K
M
L N O
REGULATOR +2.0V
REGULATOR +1.5V
(+VCC-ADJ)
SDRAM 64M MASK ROM
64M
FLASH ROM FLASH ROM
64M 64M
SDRAM 64M
not installed
REGULATOR +5V
DAC
I/V AMP
OP AMP
I/V AMP
L M N O
P Q
P-250
1
2
3
FLASH ROM
16M
4
5
6
7
REGULATOR +3.3V
8
9
10
to AJK-CN500
11
12
P-250
P Q