Service manual

43
VL-A111U/AH131U
VL-AH151U/AH161U
7-3. POWER SYSTEM BLOCK DIAGRAM
Power control IC (8CH)
CH1 ERROR AMP. IN- Comparator section
CH2 ERROR AMP. IN- Comparator section
CH1 output Drive circuit (Voltage drop)
CH2 output Drive circuit (Rise and fall voltage)
CH3 ERROR AMP. IN- Comparator section
CH3 output Drive circuit (Rise and fall voltage)
CH4 ERROR AMP. IN- Comparator section
CH4 output Drive circuit (Rise and fall voltage)
CH7 ERROR AMP. IN-
Comparator section
IN+
CH7 output Drive circuit (Rise and fall voltage)
CH8 ERROR AMP. IN-
Comparator section
IN+
CH8 output Drive circuit (NPN)
CH5 ERROR AMP. IN- Comparator section
CH5 output Drive circuit (Voltage drop)
CH6 ERROR AMP. IN- Comparator section
CH6 output Drive circuit (Voltage drop)
Standard power
1 2 3 4 5 6 7 8
DRUM ERROR
CAP ERROR
B/L CTL
3.3V Power Rise and fall voltage circuit
(PNP Tr)
4.9V Power
Rise and fall voltage circuit
(PNP Tr)
Mecha 5V
Rise and fall voltage circuit
(PNP Tr)
B/L POW
Rise and fall voltage circuit
(PNP Tr)
2.8V Power
Valtage drop circuit (PNP Tr)
DRUM VS
Valtage drop circuit (PNP Tr) CAP VS Valtage drop circuit (PNP Tr)
Trans circuit (NPN)
1 2 3 4 5 6 7 8
P-CON 3.3V
2.65V REG Circuit
DSP 1.85V P-CON 4.9V
MECHA 5V(5.7V)
DRUM VS
CAP VS
BACK LIGHT
15V +7V -4.9V -8V -15.2V
3.1V REG Circuit (P-CON3.1V)
I/O power SW
13.2V REG
CAM15V SW
D/A4.9V SW D/A3.3V SW
DSP (DELTA) 2.65V 3.1V 1.85V
RF 4.9V
I/O YC4.9V YC-4.9V 4.9V
A/D, DSP 4.9V 3.3V
MOTOR DRIVER MECHA 5V 4.9V DRUM VS CAP VS
LCD 4.9V 13.2V +7V -15.2V
AUDIO MECHA 5V 4.9V 3.3V CAM HEAD 3.1V MECHA 5V 4.9V -8V 15V
SYS 3.1V 4.9V NONREG
SYSDAC P-CON4.9V D/A4.9V D/A3.3V
NON REG (3V~7V)