Sony VPL-PX20 Service Manual page 142

CXA1875AM-T4 (IC806, IC807)
16 15 14 13 12
LEVEL
LATCH
CONVERTER
LEVEL
CONVERTER
2
I C DECODER
POWER
ON
RESET
LATCH LATCH LATCH
— DAC DAC DAC
+
VCC
REG
AMP AMP AMP
1 2 3 4 5
LM358PSR (IC821) MC75HC4052AFT (EL) (IC811)
OUTPUT 1 1 8 VCC
INPUT 1 (-) 2 7 OUTPUT 2
INPUT 1 (+) 3 6 INPUT 2 (-)
4 5 INPUT 2 (+)
GND
SN75453BPSR (IC814)
SN75157PS-ELL2000 (IC813)
NON INV IN1
1A 1 8 V CC
1B 2 7 2B
1Y 3 6 2A
GND 4 5 2Y
VPL-PX20/PX30
A B
CXA1946AR (IC819)
11 10 9
36
OPEN COLLECTOR
LEVEL
CONVERTER
GAIN12
37
GAIN11 38
IN14 39
IN13 40
IN12 41
IN11 42
LATCH LATCH
43
DAC DAC IN21
44
IN22
IN23 45
46
IN24
AMP AMP
47
GAIN21
48
GAIN22
6 7 8
EL4332CS-TE2 (IC801)
OUT1 1
16 15 14 13 12 11 10 9
GND1 2
A1 3
1 2 3 4 5 6 7 8
B1
4
B2 5
A2 6
1 8 V CC
GND2 7
OUT1 2 7 INV IN2
OUT2 3 6 NON INV IN2
OUT2
GND 4 5 INV IN2 8
C D
QA QA
35 34 33 32 31 30 29 28 27 26
VOLUME VOLUME
LOUD TONE
8dB STEP 1dB STEP
VCTBUFF
VCTBUFF
VCTBUFF
LATCH
LATCH
CONTROL
ZCDET
SHIFT
REGISTER
VCTBUFF
VCTBUFF
VCTBUFF
VOLUME VOLUME
LOUD TONE
8dB STEP 1dB STEP
1 2 7 8 9 10 11
3 4 5 6
GS1881-CTA (IC805)
1
C SYNC OUT
16 A/B
15 V
CC
2
VIDEO IN
14 V
CC
V
13 EE
11µ
V SYNC OUT 3
12 A3
11 B3
4
GND
10 GND3
9 OUT3
9-9 9-9
E
TC74VHC123AF (EL) (IC804)
A
1
25
B 2
RD 3
24 FNTO1
FADER
23 REO1
Q 4
D
Q 5
RD
C 6
R 7
22 CE
GND 8
21 CLK
DGND
20
19 GND
45k
TC74VHC244F (EL) (IC803)
45k
VCC
18
17 VCT
OEA 1 20 VCC
16 DATA
2 19 OEB
A1
YB4 3 18 YA1
15 TIMER
A2 4 17 B4
14 REO2 YB3 5 16 YA2
FADER
13 FNTO2
A3 6 15 B3
7 14 YA3
YB2
A4 8 13 B2
12
YB1 9 12
YA4
GND 10 11 B1
C SYNC
V SLICE
HORIZONTAL
V CLAMP
WINDOW D Q D
CIRCUIT
85µ
G Q CLK
NOSYNC
V
CC
VERTICAL D Q
VOLTAGE
DETECTOR
REGULATOR
CLK( ) Q
12V
BACK PORCH
TIMING
DETECTOR
CURRENT
F G
1
16 VDD
15 R
14 C
RD
Q Q
13 Q
Q Q
12 Q
11 RD
10 B
9 A
2
3
8
V CC
4
ODD/EVEN
7
OUT
Q
Q
6 R SET
BACK PORCH
5
OUT
5
H