JVC TH-A30, Service Manual

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TH-A30
3. Truth table 1. Pin layout 2. Pin function
74LVT573 (U10, U11, U12) : Latch
OE
D0
D1
D2
D3
D4
D5
D6
D7
GND
Vcc
O0
O1
O2
O3
O4
O5
O6
O7
LE 1
2
3
4
5
6
7
8
9
10 20
19
18
17
16
15
14
13
12
11
Symbol
D0-D7
LE
OE
O0-O7
Function
Data Inputs
Latch Enable Input
Output Enable Input
3-STATE Latch Outputs
Inputs Outputs
LE
X
H
H
L
OE
H
L
L
L
Dn
X
L
H
X
On
Z
L
H
O0
H:HIGH Voltage Level
L:LOW Voltage Level
Z:High Impedance
X:Immaterial
O0:Previous O0 before HIGH to LOW transition of Latch Enable
–
+
+
–
1
2
3
4
8
7
6
5
OUT1
– IN1
+ IN1
V
EE
V
CC
OUT2
– IN2
+ IN2
1ch
2ch
BA4560 (AIC2, IC5, IC6, IC7, U1, U3, U5, U9, U13)
: Dual op amp.
1.Pin layout
FAN8082 (U10) : DC motor driver
1.Pin layout
I/O
1 -
2 V
O1
O Output 1
3 V
CTL
I Motor speed control
4 V
IN1
I Input 1
5 V
IN2
I Input 2
6 SV
CC
- Supply voltage (Signal)
7 PV
CC
- Supply voltage (Power)
8 V
O2
O Output 2
DRIVER OUT
LOGIC SWITCH
1
2
5
6
7
8 GND
V
O1
V
CTL
V
IN1
V
IN2
SV
CC
PV
CC
V
O2
3
4
TSD
PRE DRIVER
BIAS
2. Block diagram
3. Pin function
V O1
V CTL
V
IN1
V O2
PV CC
SV CC
V
IN2
GND
1
2
3
4
8
7
5
6
Function Pin No. Symbol
GND
Ground