Olympus OEP-3 Service Manual page 128

(4) Decoder block
On this board, the Y/C jungle (CXA2076Q IC203) for a color television is used for decoding of a
video signal. This circuit is compatible with both NTSC and PAL systems. It integrates luminance
signal processing, chroma signal processing, RGB signal processing, and sync signal processing into
one chip. Each adjustment and setting are controlled by I
The input luminance and chroma signals are input to pins 55 and 57 of IC203. After each processing
has been performed, the input signal is output from pins 22, 24, and 26 as an RGB signal.
A VBS/S video signal is delayed by the processing in IC203. Therefore, the signal passed through a
delay line (DL101) of 350 ns is used for sync separation so as to make the timing of a video signal
coincide with that of a sync signal. (Input signal at pin 56)
The hue and color that the user adjusts are adjusted by IC203.
IC202 is a 1H CCD delay line for PAL.
C217 10uF 16V
C212 0.1uF
C213 0.47uF
C218 10uF 16V
C214 10uF 16V
C215 0.47uF
C216
0.1uF
C219 47uF 16V
CL206
C211 470pF
C210 R214 R252
0.47uF
15k 39
C208 X201
R215
15pF 4.433619MHz
470
4.43
CT201
X202
30pF NM
3.579545MHz
C209
15pF
R216
1.5k
CT202
30pF NM TP204
3.58
CL202
FSC
4-20
R220
2.2k
C232
Q204
47uF C233
2SA812-T1-M5M6
16V 0.1uF
R222
100
R219
R221
1.8k
C234
470
C227
2.2uF
1uF
50V
50V
R217
220
R218
220
BLHOLD
52
CVIN
53
DCTRAN
54
YIN
55
EXTSYNCIN
56
CIN
57
IC203
TEST
58 CXA2076Q-TL
SVCC1
59
APCFIL
60
X443
61
X358
62
NC
63
FSCOUT
64
TP203
C228
DEC_YOUT 0.1uF
R226 1M
C221
C222
C231
0.001uF
0.001uF
0.001uF
16 VDD
VI_RY
14
VI_BY
5
SAND
C223
R224
1uF
10k
6
VCOIN
GND
Fig. 1-4 Decoder Block
2
CBUS.
R230
C244
2.7k
0.1uF
R231
1k
C245
0.1uF
VD+OUT/VPROT
32
VD-OUT/VPROT
31
VTIM
30
ABLFIL
29
ABLIN/VCOMP
28
IKIN
27
BOUT
26
BSH
25
GOUT
24
GSH
23
ROUT
22
RSH
21
SVCC2
20
1
11
VO_RY
12
VO_BY
C247
0.1uF
2
AB
IC202
CXL5520M-T4
8
A+9V
L201
1uH
Q205
2SC1623-T1-L5L6
C257
R232 0.1uF
1k
R233
1k
A_GND
C249
0.1uF
C250
10uF
16V
R240
R234
1.5k
C252
1k
10uF
R236
16V
4.7k
R235 4.7k
C253
0.1uF
C254 0.1uF
R239
C255
4.7k
0.1uF
R237
4.7k
C259
C256 R238
0.1uF 47uF
4.7k
16V
C258
0.1uF
C251
10uF
16V
OEP-3 V1 (UC)