Service manual

43
VL-WD250U
VL-WD450U
12. SIGNAL FLOW DIAGRAMS
12-1. EE MODE FLOW (VIDEO)
WAVEFORM DIAGRAM
(DURING COLOR BAR RECORDING)
VIO ENGINE
IC1401
IC2800
IC8802
VIDEO I/O
R
Y
Y
R-Y B-Y
C
G
B
RG
B
RG
B
LCD Panel
9
12
14
19
1
168
249
254
43 48 53
175
182
184
187
189
192
259 264 269
22
24
20
7
6
8
164
ZYP
ZCP
174
IC4401
IC202
CAM ENGINE
68
72
84
85
117
118
CAM ADIN
VF LCD Panel
14
16
11
2
48
1
120
127
75
77
87
92
SEP-Y IN/OUT
SEP-C IN/OUT
VIDEO IN/OUT
IC4401 170pin ZYP3 Input
IC4401 254pin C Output
IC4401 184pin ZCP3 Input
IC4401 249pin Y/YC Output
IC4401 134pin CDC3 Output
IC4401 124pin CDY3 Output
1
1
1
1
1
1
CH1=1V
DC P*10
CH1=500mV
DC P*10
20µs/d
5ms/d
5ms/d
CH1=1V
DC P*10
20µs/d
CH1=500mV
DC P*10
5ms/d
CH1=1V
DC P*10
5ms/d
CH1=1V
DC P*10
WAVEFORM DIAGRAM
(DURING COLOR BAR RECORDING)
12-2. FLOW IN REC MODE (VIDEO)
IC452
REC/PB ENGINE
CDY
CDC
HEAD AMP
REC DATA
REC GATE
SC3301
B TO B
40
47
50
57
244
243
IC4401
VIO ENGINE
ZYP
ZCP
140
131
137
127
130
121
124
174
164
168
182
175 184
192
187
189
IC452 244pin Rec GATE Output
IC452 243pin Rec DATA Output
CH1=1V
DC P*10
5ms/d
1
CH1=1V
DC P*10
5ms/d
1