Philips 20MC4304, Service Manual

Page: 121 / 316

1-11-7
Power Supply Block Diagram
T1006BLP
LINE FIL
TER
BRIDGE
RECTIFIER
T601
IC601
ERR
OR
V
O
LT
A
GE DET
W601
F601 4A/125V
L601
D603 D606
DEGA
USSING
COIL
CN601
DG601
PS601
HO
T
COLD
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.
CA
UTION !
Fix
ed v
oltage po
w
er supply circuit is used in this unit.
If Main Fuse (F601) is b
lo
wn, chec
k to see that all components in the po
w
er supply
circuit are not def
ectiv
e bef
ore y
ou connect the A
C
plug to the A
C
po
w
er supply
.
Otherwise it ma
y cause some components in the po
w
er supply circuit to f
ail.
4A 125V
SWITCHING
Q601
Q604
Q605
Q683
Q606
Q609
Q607
Q613
Q614
Q688
Q681
Q221
IC682
Q602
VR601 +B ADJ
Q1610,1611
CN1602
CN502 CN503
CN602 CN301
P-DO
WN
D
VD-MAIN-PO
WER
P-ON-H
Q1612
Q1616
Q1617
Q1615
SW+5V
T
O
CR
T/H.V
.
BLOCK DIA
GRAM
CN502
CN602
+33V
1 2
3 4
10 11 17 12 15 16 14 13
9 8 6 3
FEED BA
CK
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
1+
B
2+
B
8
+26V
M+12V TIMER+5V AL+5V P-ON+12V P-ON+8V P-ON+9V P-ON+5V(4) P-ON+5V(2) P-ON+5V(3) P-ON+5V(1)
+5.7V REG.
+5V REG.
SW +5V
SW +5V
SW +5V
IC1602
IC0604
IC0603
+1.2V
REG.
1
2
4
SW CTL
SW CTL
TO SYSTEM CONTROL/SERVO BLOCK DIAGRAM
77
D
V
D-MAIN-PO
WER
17
17
EV+4V
18
18
EV+4V
11
AL+9V
11
EV+1.2V
22
EV+1.2V
88
EV+9V
99
EV+9V
77
D
VD-ON+5V
66
D
VD-ON+3.3V
33
EV+3.3V
44
EV+3.3V
55
EV+3.3V
17
17
PO
WCON
D
VD MAIN CB
A UNIT
EV+9V D
VD-ON+5V
D
VD-ON+3.3V
EV+1.2V EV+3.3V PWRCON
T
O
D
VD SYSTEM
CONTR
OL
/SER
V
O
BLOCK
<D
VD SECTION>
NO
TE FOR
WIRE CONNECT
ORS:
1.
PREFIX SYMBOL "CN" MEANS CONNECT
OR.
(CAN DISCONNECT AND RECONNECT
.)
2.
PREFIX SYMBOL "CL" MEANS
WIRE-SOLDER
HOLES OF
THE PCB
.
(WIRE IS SOLDERED DIRECTL
Y
.)
SUB CBA