Main Board - Philips LX700/21S/22S/25S Service Manual

8-1

MAIN BOARD

TABLE OF CONTENTS
Internal IC Diagram ......................................................... 8-1
Circuit Diagram (Top Left) .............................................
Circuit Diagram (Top Right).............................................8-7
Circuit Diagram (Bottom Left) ............. ........................... 8-8
Circuit Diagram ( Bottom Right) ...................................... 8-9
PCB Layout(Component View) ....................................... 8-10
PCB Layout(Copperside View) ........................................ 8-12
Electrical Parts list ........................................................... 8-14
LC72131 INTERNAL IC DIAGRAM
ST505 INTERNAL IC DIAGRAM
8-6
REFERENCE
XIN
DIVIDER
XOUT
SWALLWO COUNTER
FMIN 1/2
X 1/16 1/17 4bit8
12bit8 PROGRAMMOBLE
AMIN
DIVIDER
CE
CCB
DI
DATA SHIFT REGISTERLATCH
I/F
CL
DO
POWER
V DD ON
RESET
V SS
B01 B02 B03 B04
IN1A 29 M3
IN1A
IBIAS 23
+3.3V
CONFIG 24
PWRDN PWRDN 25 M2
PROTECTIONS
R57 R59 FAULT 27
&
10K 10K
LOGIC
26
TRI-STATE
C58
M5
100nF
TH_WAR 28
TH_WAR
IN1B 30
IN1B
M4
V DD 21
V DD 22
V SS 33 REGULATORS
V SS 34
M17
C58 C53
SIGN
100nF 100nF
V CC
35
C60
SIGN
100nF V CC
36
M15
IN2A
IN2A 31
GND-Reg
20
GND-Clean
19 M16
IN2B
IN2B 32
GNDSUB M14
1
8-1
PHASE DETECTOR
CHARGE PUMP
UNLOCK DETECTOR
UNIVERSAL
COUNTER
I01 I02
1A
+V CC
V CC
15
C30 C55
1 F 1000F
L18 22H
17
OUT1A
C20
16
100nF
OUT1A
C52
C99
14 GND1A 330pF R98
100nF
6
C23
V CC 1B
12
470nF
R63 R100
C101
20 6
C31
100nF
11
1 F
C21
OUT1B
100nF
10
OUT1B L19 22H
13 GND1B
V CC 2A
7
C32
1 F
L113 22 H
8
OUT2A
C110
9
100nF
OUT2A
C109
C107
6 GND2A 330pF R103
100nF
6
C108
V CC 2B
4 470nF
R104
R102
C106
20
C33 6
100nF
3 1 F
C111
OUT2B
100nF
2
OUT2B L112 22 H
5 GND2B
PD
AIN
AOUT
IFIN