Yamaha PortaTone PSR-640 Service Manual - Page 16
Browse online or download pdf Service Manual for Musical Instrument Yamaha PortaTone PSR-640. Yamaha PortaTone PSR-640 18 pages.
Also for Yamaha PortaTone PSR-640: Step By Step Procedures (21 pages)
Print Page
A
B
C
PSR-740 CIRCUIT DIAGRAM (DM2/2, MIC-JACK, MIC)
1
DM
2/2
2
3
4
5
6
7
VOP3
8
9
10
11
12
PSR-740
A
B
C
D
E
F
G
INVERTER
WAVE ROM LL 32M
WAVE ROM LH 16M
INVERTER
SWP30B
WAVE ROM HH 16M
WAVE ROM HL 32M
REGULATOR +3.3V
DRAM 4M
ADC
not installed
(
)
(
)
installed
DRAM 4M
D
E
F
G
H
I
J
OP AMP
OP AMP
DAC
to AM-CN320
28CC1-8814267
H
I
J
K
L
M
N
LED DRIVER
MIC
(RE)
(GR)
0P AMP
18K
560P
0P AMP
MIC-JACK
MIC /LINE IN
28CC1-8814268
: Ceramic Capacitor
: Semi-Conductive Ceramic Capacitor
Note : See parts list for details of circuit board
component parts
K
L
M
N
O
P
Q
PSR-740
1
2
3
100
4
4.7K
5600p
5
28CC1-8814266
6
7
8
to DM-CN3
9
10
11
12
PSR-740
O
P
Q