7-5
Power Supply Block Diagram
L0171BLP
COLD
T602
12
9
10
11
8
7
6
4
3
1
2
MAIN CB
A
NO
TE :
The v
oltage f
or par
ts in hot circuit is measured using
hot GND as a common ter
minal.
Q505
Q504
Q503
Q516
Q514
HOT CIRCUIT. BE CAREFUL.
FOR CONTINUED PROTECTION AGAINST RISK OF FIRE,
REPLACE ONLY WITH SAME TYPE 4 A, 125V FUSE.
CAUTION:
ATTENTION:
UTILISER UN FUSIBLE DE RECHANGE DE MÊME TYPE DE 4A, 125V.
4A/125V
CAUTION !
Fixed voltage ( or Auto voltage selectable ) power supply circuit is used in this unit.
If Main Fuse (F601) 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.
4
2
1
Q511
Q502
Q501
+1.8V
REGULATOR
IC503
+3.3V
REGULATOR
IC504
RESET
IC505
REG+5V(1)
P-ON+3.3V(D)
P-ON+1.8V(D)
PR
O
TECT
-1
P-ON+3.3V(A)
AL+33V
AL+12V
P-ON-H
Q508
Q513
Q512
Q507
Q633
IC502
+3.3V
REGULATOR
D649
IC604
+5V
REGULATOR
REG+5V(2)
Q517
Q515
PR
O
TECT
-2
PR
O
TECT
-3
V
GH-H
IC506
+9V
REGULATOR
IC603
+5V
REGULATOR
T
O
SYSTEM
CONTR
OL
BLOCK
DIA
GRAM
4A/125V
F601
4A/125V
LINE
FIL
TER
L601,L602
A
C
601
A
C
CORD
BRIDGE
RECTIFIER
D605 - D608
HO
T
IC601
ERR
OR
V
O
LT
A
G
E DET
CN101A
CN111B
P
A
NEL+24V
73
P
A
NEL+5.4V
55
P
A
NEL-12V
82
AL+5V
22
2
P
A
NEL+3.3V
46
P
ANEL+24V
P
ANEL+5.4V
-8V
AL+5V
P
ANEL+3.3V
LCD MAIN CB
A UNIT
CN102A
CN112B
P
A
NEL+12V
19
P
A
NEL+9V
28
P
ANEL+12V
P
ANEL+9V
IC601
ERR
O
R
V
O
LT
A
G
E DET
Q601
Q603
SWITCHING
CONTR
O
L
SWITCHING
Q272
IC275
(OP AMP)
6
5
IC276
-8V
REGULATOR
7
-6V
NOTE: CBA AND PWB MEANS PRINTED WIRING BOARD.
