Olympus OEP-3 Service Manual page 125

4-2. Analog Video Signal Processing Block
4-2-1. Outline
The analog video signal processing block mainly consists of the following two blocks.
1. Interface block (IF-764 board)
The interface block mounts a relay for THROUGH/EE selection.
All video signals are input and output from and to the external equipment via this block.
2. Analog video signal processing block (Part of VPR-63 board)
A part of the VPR-63 board consists of an analog video signal processing block.
Moreover, this block can be mainly classified into a video decoder block (that fetches the input video
signal into memory) and video encoder block (that monitors the digital video signal from memory).
2
I CBUS is almost used for the setting and adjustment of an analog video block. The analog video
block is controlled by the SY-282 board.
The main functions of the analog video signal processing block are as follows:
. Selection of input signals (composite video, S video, and RGB signals)
. Conversion of composite video and S video signals into RGB signal (Decoding of video signal)
. AGC (Automatic Gain Control) for input signal
. User adjustments (HUE, COLOR, GAIN, OFFSET, MONITOR-RGB, etc.)
. OSD (On Screen Display) function
. Selection of monitor output signal (SOURCE/MEMORY)
. Sync signal processing (NTSC/PAL detection, signal detection, sync separation, and AFC)
. Conversion of RGB digital signal into composite video and S video signals (Encoding of video signal)
4-2-2. Interface Block (IF-764 Board)
A monitor output signal is switched into THROUGH or EE using this block. By using a mechanical
relay, the monitor output of an input signal can be performed even if the power of this unit is off.
J101
8
R_IN
7
6 CL102
G_IN
5
4
B_IN
3
2
SYNC_IN
1
OEP-3 V1 (UC)
R115
0
S101
2
1
3
5
FL101
4
6
CL101 EMI
IN OUT
8
GND 7
9
11
10
12
D101
RD9.1M-T1B
D102
RD9.1M-T1B
R101
150
RL101
R102
150
FL201
EMI CL201
IN OUT
GND
D115
RD9.1M-T1B
CL202
D116
RD9.1M-T1B
J201
8
R_OUT
7
6
G_OUT
5
4
B_OUT
3
2
SYNC_OUT
1
4-17