Philips PET744 Service Manual page 18

5
7.0 ELECTRICAL DIAGRAM
CIRCUIT DIAGRAM-POWER
D
J1
DC JACK F1
T1 CON
DC_IN
2 1
FUSE
4001
IN H OUT L
C
R8
R12
10K
+9VIN
B
R20
+3.3V
33K 1%
R17
10K
D2
2K4 1%
Low Voltage Det
R22 4.7K
Q9
2
3904
R23
3.6K 1%
A
5
4
D3
SK34
POWER OFF
R154
POWER ON
10K
D4
1 2
R51
D5 SK34
68K
SW2
POWER
Q22
2 1
BAT54C
EC1
1K
R5
+3.3V 47uF/25V
4.7K
D6 R170
15V
10K
R49 560
ON/OFF
Q23
3904
R11 Q7
R171
3904
4.7K
10K
+9VIN
L3 22uH/CD43
EC7
C9
0.1uF/0603
100uF/25V
GND
1uF(0805)
L6 22uH/CD43
R24
EC9 10/0603
C15
+
0.1uF/0603
100uF/25V
GND
GND C16
1uF(0805)
GND
4
3
JK9 PIN HEADER 1X4
Discharge
Q2
SI2307
Q3
D1
3904
15V
R6 Q4
4.7K
3904
+9VIN
SI2307
+
Q5 EC5
100UF/25V
R4
4.7K
ON/OFF
Q6
+3.3V
3904
R170
10K
D12
ON/OFF DRIVE
1 2
RLS4148
ON/OFF DET
+3.3V
Q8 SI2307 L4
1 3
47uH/CD54
R13
R14
EC6
10/0603 +
10/0603
C12
+
470uF/6.3v
0.1uF/0603
GND
GND
GND
GND
5
VIN
C11
R15 3K3 R16 20K
3
VFB
1
CE
U2
S701
GND R21
10K
GND
GND
L7
+5V
Q11 SI2307
1 3
47uH/CD54
R25
EC8
10/0603 +
C153
470uF/6.3v
0.1uF/0603
GND
GND
GND
5
VIN
R27 18K R28 22K
3
VFB
1
CE
U3
S701
R30
10K
GND
GND
3
2
R56
RFVCC
1K
+1.8V
L1 FB 600R
+3.3V U1
3 1
IN OUT
+ EC2 C2
2
GND
100uF/10V 0.1uF/0603
1117-1.8V
+9VIN
+9VIN
+5V
+3.3V
+3.3V
+1.8V
+1.8V
Low Voltage Det
Low Voltage Det 2
ON/OFF DET
ON/OFF DET
ON/OFF DRIVE
ON/OFF DRIVE
2
1
D
C
B
2,5
+5V 2,3,5
2,3,4
2
2
2
A
1