Yamaha PortaTone PSR-350 Servicehandleiding - Pagina 16

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Yamaha PortaTone PSR-350 Servicehandleiding
PSR-350
IC BLOCK DIAGRAM
TC74HCT08AF(EL) (XZ012A00)
MM74HCT08SJX (XZ013A00)
Quad 2 Input AND
DM : IC602
1A
1
14
1B
2
13
1Y
3
12
2A
4
11
2B
5
10
2Y
6
7
GND
LA4705NA (XQ619A00)
Power Amplifier
AM : IC801
CIRCUIT BOARDS INDEX
AM (XZ754C0) .................................................... 19
DM (XZ669C0) ............................................... 17/18
LCD (XY486B0) .................................................. 22
MK-H (XR565C0) ................................................ 24
MK-L (XR564C0) ................................................ 23
MKS5 (XZ594A0) ................................................ 23
PN 1 (XZ777B0) .................................................. 20
16
µPC4570C (XC520A00)
Dual Operational Amplifier
DM : IC502
V
CC
4B
Non-Inverting
4A
-DC Voltage Supply
4Y
3B
9
3A
8
3Y
+DC Voltage
Output A
1
+V
8
Supply
Inverting
Output B
2
7
Input A
-
+
Inverting
3
6
+
-
Input B
Input A
Non-Inverting
4
-V
5
Input B
M5291P (XV856A00)
DC-DC Converter
AM : IC902
Switch-Collector
Switch-Emitter
Capacitor
Ground
PN 2 (XZ776B0) .................................................. 21
PN 3 (XZ776B0) .................................................. 21
PN 4 (XZ777B0) .................................................. 20
PW (XZ776B0) .................................................... 22
TW (XZ754C0) .................................................... 19
VR (XZ776B0) ..................................................... 22
Note : See parts list for details of circuit board conponent parts.
µPD6379AGR (XR998A00)
D/A Converter
DM : IC501
Rch analog
1
R
V
OUT
DD
output
Voltage
2
REF
C
LK
reference
Ground
3
GND
SI
Lch analog
4 L
LR
OUT
CK
output
1
Q
S
R
2
Generator
Comparator
3
1.17V
+
reference
voltage
4
Power supply
8
Shift clock
7
Serial dat input
6
L/R clock
5
8
Driver
7
Peak current detect
6
Power supply
5
Input