Sony VPL-PX20 Service Manual page 152

BA Board Waveforms
1 2 3
1.0 Vp-p 0.7 Vp-p 0.7 Vp-p
TP100 [VIDEO] TP106 [R-Y/R] TP107 [Y/G]
5 6 7
5.0 Vp-p 3.8 Vp-p 0.7 Vp-p
TP115 [H.SYNC] TP116 [V.SYNC] TP103 [R-Y]
9 0 !-
0.6 Vp-p 0.6 Vp-p 0.6 Vp-p
TP105 [Y] TP108 [R|OUT] TP110 [B|OUT]
![
3.8 Vp-p
TP113 [SCP|IN]
CXA1875AM-T4 (IC250)
15
16 14 13 12
LEVEL
LATCH
CONVERTER
LEVEL
CONVERTER
I 2 C DECODER
POWER
ON
RESET
LATCH LATCH LATCH
— DAC DAC DAC
+
VCC
REG
AMP AMP AMP
1 2 3 4 5
VPL-PX20/PX30
A B
4
0.7 Vp-p
TP112 [B-Y/B]
8
0.7 Vp-p
TP104 [B-Y]
!=
0.6 Vp-p
TP109 [G|OUT]
11 10 9
OPEN COLLECTOR
LEVEL
CONVERTER
LATCH LATCH
DAC DAC
AMP AMP
6 7 8
C D
BA BA
CXD2064Q-T6 (IC221)
BORDER EMPHA
NTSC:1H NTSC:1H
ADIN 2 A/D
PAL :2H PAL :2H
CLPO 1 CLAMP
ADAPTIVE
FILTER OP
LOGICAL OPERATION
VCO 1/4
SW
1/2
42 44 39
CPO VCV PLSL
GS4981 (IC256)
C SYNC
V1
VIDEO
2
INPUT
V2
VOLTAGE
VCC 8
REGULATOR
TIMING
RESET 6 CURRENTS
TC4W53F (TE12R) (IC251, 103)
COMMON 1
INH 2
LOGIC LEVEL
CONVERTOR
VEE 3
VSS 4
9-19 9-19
E
MC74HC4538AFEL (IC257)
VDD 2-C 2-CR 2-RD 2-CK
16 15 14 13 12
VERTICAL
+ +
DL D/A 9 AYO
- -
D/A 7 ACO
1 2 3 4 5
1-C 1-CR 1-RD 1-CK 1-CK
4fsc
SW
PHASE
COMPARATOR
37 38
FIN CKSL
COMPOSITE
1
SYNC OUTPUT
HORIZONTAL
7
OUTPUT
NO SYNC
D Q
VERTICAL
VERTICAL SYNC
DETECTOR
CLK Q 3
OUTPUT
BACK PORCH
BACK PORCH 5
OUTPUT
DETECTOR
VDD
8
OUT IN
C 7 CH0
6 CH1
OUT IN
C
A
5
F G
1
2-CR 2-Q 2-Q
11 10 9
6 7 8
1-Q 1-Q GND
2
3
4
5
H