Sylvania DVR90DG, Service Manual

Page: 18 / 57

1-9-1
BLOCK DIAGRAMS
System Control Block Diagram
E7A00BLS
IC101 (MAIN MICR
O CONTR
O
LLER)
IC1501 (SUB MICR
O CONTR
OLLER)
REMO
T
E
SENSOR
RE2001
1G 7G
~
23 17
~
a h i
~
7
14
~
GRID
RESET
EV+3.3V
VFD
SEGMENT
FL2001
IC2001
IC1502
A
V
CB
A
D
VD MAIN CB
A
(VFD DRIVER)
KEY SWITCH KEY SWITCH
CN1502
CN3001
KEY
-1
1
1
KEY
-2
2
2
SW CB
A
16
28
1 2
48 50 49 27
1 2 3
52 53
38 40 39 33 34
22 19 18 20 29
N23
J25
N24
L25
R24
8 9
41 12
14 30
7
1
2
11
27MHz X'T
AL
X552
CLK 27 IN
CLK 27 OUT SYS-RESET
SUB-RXD
SUB-TXD
SUB-SCLK
RD
Y
CN701
SYS-RESET
SUB-RXD
SUB-TXD SUB-SCLK RD
Y
CN1101
PO
W
-SW
REG-CONT PWSW VIDEO-SW1
A
U
DIO-MUTE
A
U
DIO-SW1
A
U
DIO-SW2
SD
A
SCL
X OUT X IN XC OUT XC IN
RESET
P-DO
WN
VCC
FL-SD
A
FL-SCL FL-STB
REMO
T
E
KEY
-1
KEY
-2
PO
W
-SW
REG-CONT PWSW
VIDEO-SW1
SD
A
SCL
A
U
DIO-MUTE
A
U
DIO-SW1
A
U
DIO-SW2
T
O
PO
WER SUPPL
Y
BLOCK DIA
GRAM
T
O
VIDEO
BLOCK DIA
GRAM
T
O
A
U
DIO
BLOCK DIA
GRAM
8MHz RESONA
T
OR
X1501
32.768KHz X'T
AL
X1502
Q1501
Q1502
C1501
(BA
C
KUP CAP
A
CIT
OR)
DIN CLK STB
N1
SCL SDA
TU1701(TUNER UNIT)
10 11
EV+5V
42
VIDEO-SW2
VIDEO-SW2
43
VIDEO-SW3
VIDEO-SW3
44
VIDEO-MUTE
VIDEO-MUTE
N2
44
SYS-RESET
11
SUB-RXD
33
SUB-TXD
55
SUB-SCLK
22
RD
Y
IC106
CN101
CN1051
26
REG-CONT2
VI+1.2V
P-ON+1.2V
30
30
1V2CONT
+1.2V REGULA
T
OR
T4
SYS-RESET