4-24
OEP-3 V1 (UC)
(2) Sync generator block
A sync signal for the monitor output must be generated by this unit when a memory image is selected
for the monitor output or when no input signal exists. This circuit is peripheral circuit IC406.
IC406 is a sync signal generator compatible with NTSC and PAL systems. IC406 generates video
pulses (CSYNC, ODD/EVEN, HD, VD, and SC signals) by inputting a clock. These video pulses are
sent to IC407 and a frame memory block.
NTSC and PAL are switched by Q408. For NTSC, the X401 block is turned on, and a clock of
14.31818 MHz is sent. For PAL, the X402 and X403 blocks are turned on, and clocks of 14.1875
MHz and 17.734475 MHz are sent, respectively. For PAL, a subcarrier (SC signal) is synchronized
with a horizontal sync signal by VCXO (peripheral circuits Q407 and Q409).
Fig. 1-8 Sync Generator Block
17.7
14M
17M
14.1
14.3
VCO DC
CL405
4.7uH
L403
C420
47uF
6.3V
C418
0.1uF
CL406
TP404
C454
0.001uF
R445
1k
C453
47pF
C452
47pF
R444
10k
R443
6.8k
X403
17.734475MHz
C439
10pF
20pF
CT403
C438
0.1uF
L405
4.7uH
Q410
DTA124EKA-T146
R424
4.7k
R423
1.5k
Q411
2SC1623-T1-L5L6
Q412
DTC124EKA-T146
Q408
DTC124EKA-T146
CL407
TP405
IC406
CXD1217Q-T4
R428
10k
C437
0.1uF
R427
220k
C436
2.2uF
50V
R426
4.7k
R425
10k
Q409
2SC1623-T1-L5L6
CL408
TP406
R422
100k
D401
1T362A-M20E-T8A
C433
0.001uF
20pF
CT402
C430
0.1uF
33pF
NM
C427
X402
R421
10k
R420
6.8k
C424
39pF
C423
39pF
R419
1k
Q407
2SC1623-T1-L5L6
C417
0.001uF
C416
0.1uF
IC405
TC4W53F(TE12R)
C415
0.001uF
R415
1k
C413
47pF
Q406
2SC1623-T1-L5L6
C412
47pF
R414
10k
R413
6.8k
X401
14.318182MHz
C409
10pF
CT401
20pF
C408
0.1uF
Q405
DTA124EKA-T146
22
HCOMOUT
23
CLOUT
7
4FSCOUT
15
O2FH
26
OFH
6
OHD
10
OVD
2
OSYNC
4
OBLK
31
OBF/COLB
5
OLALT
3
OFLD
30
OFLD1
17
OSC
29
VRI
21
HRI
13
LALTRI
18
EXT
20
MODE2
19
MODE1
24
CLIN
14
TEST
8
4FSCIN
28
VDD
12
VSS
21
3
4
21
3
VEE
4
VSS
8
VDD
5
A
1
2
INH
7
6
3
4
21
Summary of Contents for OEP-3
Page 1: ...COLOR VIDEO PRINTER OEP 3 SERVICE MANUAL Volume 1 1st Edition...
Page 6: ......
Page 80: ......
Page 119: ...4 11 OEP 3 V1 UC Memory Configuration Eight Frame Memory Configuration Four Frame...
Page 154: ......
Page 165: ...5 11 OEP 3 V1 UC 5 5 Direct Chuck Mechanism...
Page 176: ...2000 9 22 OEP 3 UC E 9 955 247 11...