Overall Circuit Diagram - Yamaha Portatone PSR-550 Service Manual

A B C
PSR-550 OVERALL CIRCUIT DIAGRAM 1/2 (DM)
DM
to PN 1/5-CN401
to AM-CN800
to MKS5-CN1
DRAM 4M
D E F
DECODER
SYSTEM RESET
SRAM 1M
DRAM 4M
CPU
SWX00B
REGULATOR
+3.3V
DAC
REGULATOR
+5V
G H I
OR
D-FF
D-FF
DECODER
D-FF
MAIN ROM
32M
FDC
WAVE ROM
REGULATOR
64M
+5V
to AM-CN100
: Mylar Capacitor
: Ceramic Capacitor
: Semiconductive Ceramic Capacitor
: Metal Oxide Film Resistor
Note : See parts list for details of circuit board component parts.
J K
to BACK LIGHT ASS'Y
to PN 1/5-CN501
to PN 1/5-CN301
to PN 1/5-CN101
FDD
to AM-CN530
DC-DC
CONVERTER
to PN 1/5-CN102
28CC1-8819393
L
PSR-550
1
2
3
4
5
6
7
8
1