Philips 20MC4304, Service Manual

Page: 20 / 316

1-4-6
CRT / H.V. Block Diagram
TD901BLCRT
PULSE UP
AMP
THERMAL PR
O
TECTION
3
6
7 1
5
V
-DRIVE
8
H-DRIVE
4
8
10
7 9 6
GREEN AMP
BLUE AMP
Q503,Q506
Q502,Q505
Q501,Q504
H.DRIVE
Q591
Q571
T572
FBP ACL/ABL
V- DRIVE H- DRIVE
D.
Y
.
L551
IC551
(V
-DEFLECTION CONTR
OL)
T571 F
.B
.T
.
ANODE FOCUS SCREEN
3 5
CL503A
7
CL504A
R G B HEA
TER
ANODE
GND
V501 CR
T
GND FOCUS SCREEN
JK501
HEA
TER
1
1
CN501A
CL501
CL501A
REC VIDEO
SIGNAL
PB VIDEO
SIGNAL
CN571
+180V
3
3
11
S F
HV
FOCUS VR
SCREEN VR
+B
7
CL502A
2 3 4
RED GREEN BLUE
8+
B
5
DEF+B
H.OUTPUT
V
-RAMP-FB
1 3 5 4
5 4 3
1
WF13
WF14
WF12
WF10
WF11
RED AMP
J521
+B
J535
GND
5
CN502
CL502B
CN503
CL503B
CN503
CL504B
3 7 4 8 2
3 4 7 8 5
V
-DRIVE
8
H-DRIVE
4
FBP ACL/ABL
3 5 7
RED
12
GREEN
11
BLUE
10
V
-RAMP-FB
5+
B
6+
B
3
DEF+B
D
VD VIDEO
SIGNAL
JUNCTION-B CB
A
JUNCTION-A CB
A
TO PO
WER
SUPPL
Y
BLOCK CN2602
TO CHR
OMA
BLOCK CN1301 TO CHR
OMA
BLOCK CN1301
CR
T CB
A
H.V
. CB
A
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
.)
TEST POINT INFORMA
TION
:INDICA
TES A
TEST POINT
WITH A JUMPER
WIRE A
C
R
OSS A HOLE IN
THE PCB
.
:USED
T
O
INDICA
TE A
TEST POINT
WITH A COMPONENT LEAD ON FOIL SIDE.
:USED
T
O
INDICA
TE A
TEST POINT
WITH NO
TEST PIN.
:USED
T
O
INDICA
TE A
TEST POINT
WITH A
TEST PIN.