Psr-740 Circuit Diagram (Dm1/2, Mks3, Mkh, Mkl, Inv) - Yamaha Portatone PSR-740 Service Manual

A B C

PSR-740 CIRCUIT DIAGRAM (DM1/2, MKS3, MKH, MKL, INV)

1
2
CPU
3
28CC1-8812655
4
DM 1/2
5
to PN1-CN8
6
to JACK-JK5
7
to MIC-JACK - CN5
8
9
10
REGULATOR +9V REGULATOR +5V
11
DC-DC CONVERTER
to AM-CN310
12
PSR-740
A B C
D E F G
MKH
MKS3
MKL
FDC
SRAM 1M
CPU
DRAM 4M
DRAM 4M
FDC
Floppy Disk Drive
D E F G
H I J
AND
OR
DECODER
OR
AND
OR
INVETER OR
EPROM MAIN1 32M
D-FF
EPROM MAIN2 32M
DECODER
D-FF
INVERTER
LCDC
INVERTER
H I J
K L M N
28CC1-8811360
TRANSISTOR ARRAY
to PN1-CN2
Note : See parts list for details of circuit board
TRANSISTOR ARRAY
to PN1-CN1
TRANSISTOR ARRAY
SRAM 256K
N.C.
28CC1-8814267
K L M N
O P Q
PSR-740
1
2
3
28CC1-8811360
4
5
6
: Ceramic Capacitor
: Mylar Capacitor
: Metal Oxide Film Resistor
component parts
7
8
L C D
9
to Back - light Assembly
10
INV
11
2NA-8814265
12
PSR-740
O P Q