JVC UX-P55 Service Manual page 37

4.12 LB1641 (IC801) : DC motor driver
• Pin layout
1 2 3 4
GND OUT1 P1
VZ
4.13 NJU6433FG1 (IC934) : LCD driver
• Pin layoout
48
49
64
1
• Block diagram
VDD
COMMON
Vss
DRIVER
VLCD
INH
DIVIDING
CIRCUIT
OSC1
OSC
OSC2
CE
INPUT
DATA
SELECTING
MODE
CIRCUIT
SCL
5 6 7 8 9 10
IN2 VCC1 VCC2 P2 OUT2
IN1
33
32
17
16
MSB LSB
SHIFT REGISTOR 4
50bit
DECORDER
• Truth table
Input
IN1 IN2 OUT1
0 0
1 0
0 1
1 1
• Pin function
Pin
Symol
No.
1~50 SEG1~SEG50 Segment output terminal for LCD.
51,52 OSC1,OSC2 CR oscillating terminal.
53 VDD
54 Vss
55 VLCD
56 CE
57 SCL
58 DATA
59 MODE
60 INH
61~44 COM4~COM1 Common output terminal for LCD.
LATCH CIRCUIT/SEGMENT DRIVER
MSB LSB MSB
SHIFT REGISTOR 3
50bit
SHIFT RESISTOR
CONTROL CIRCUIT
Output Mode
OUT2
0 0 Brake
1 0 CLOCKWISE
0 1 COUNTER-CLOCKWISE
0 0 Brake
Function
Power supply terminal for inside.
GND level.
Power supply terminal for LCD drive.
Chip enable.
Serial data transmission clock terminal.
Serial data input terminal.
Mode-setting-signal input terminal.
Display-off control signal input terminal.
LSB MSB
SHIFT REGISTOR 2 SHIFT REGISTOR 1
50bit
INPUT CHANGING CIRCUIT
LSB
50bit
(No.22036)1-37