7-7
Power Supply Block Diagram
A8AF1BLP
HO
T
HO
T
COLD
PO
WER SUPPL
Y CB
A
INVER
TER CB
A
HOT CIRCUIT. BE CAREFUL.
Q602
SWITCHING
CONTR
OL
1
4
3
2
IC603
T601
CN601
T
O
INVER
TER
BLOCK DIA
G
RAM
CN1901
3
HO
T
-GND
3
AC
L
1
2
1
LINE
FIL
TER
L1901
A
C
1901
A
C
CORD
LINE
FIL
TER
L1902
BRIDGE
RECTIFIER
AC
L
HO
T
-GND
D1901 - D1904
5
11
14
12
17
18
13
16
15
19
9
7
8
FEED
BA
CK
Q601
SWITCHING
Q631
CN301
CN3601
Q632,Q634
SWITCHING
Q646
SW
-6.8V
Q502
Q645,D648
SW+13V
Q650
IC637
+3.3V
REG.
2
3
JS651
Q633
Q639,Q671
JS652
Q637
SW+5V
Q801
SW+9V
Q638,D634
SW+3.3V
4A/125V
F1901
4A/125V
P-ON-H1
T
O
SYSTEM
CONTR
OL
BLOCK
DIA
GRAM
P-ON-H2
RESET
+5V REG.
PROTECT2
PROTECT1
SWITCHING
+40V
P-ON+5V
AL+3.3V
AL+13V
P-ON+9V
T
O
A
U
DIO-2
BLOCK
DIA
GRAM
RESET
Q501
LCD-6.8V
8
P-ON+3.3V
14,15
LCD+3.3V
10
+3.0V(1)
18,19
+3.0V
16
LCD+24.5V
6
LCD+13V
7
AL+3.3V
12
P-ON+5V
20
16
9,10
14
5,6
8
18
17
12
4
LCD+13V
LCD+24.5V
LCD-6.8V
LCD+3.3V
AL+3.3V
P-ON+2.0V
+2.0V REG.
IC3302
+1.8V
+1.8V REG.
IC3601
+1.1V
+1.1V REG.
IC3603
P-ON+5V
DIGIT
AL MAIN CB
A UNIT
CAUTION !
Fixed voltage (or Auto voltage selectable) power supply circuit is used in this unit.
If Main Fuse (F1901) is blown , check to see that all components in the power supply
circuit are not defective before you connect the AC plug to the AC power supply.
Otherwise it may cause some components in the power supply circuit to fail.
For continued protection against risk of fire,
replace only with same type 4 A, 125V fuse.
CAUTION ! :
ATTENTION :
Utiliser un fusible de rechange de m
ê
me type de 4A, 125V.
4A/125V
NOTE:
The voltage for parts in hot circuit is measured using
hot GND as a common terminal.