Olympus OEP-3 Service Manual page 151

4-4-3. VPR (Analog Video Block) Control
2
I C bus control
Purpose
2
Controls the I C bus circuit on the analog board.
Signal line name I/O
IIC-SCL Output
IIC_SDA Output
IIC_CTS Input
2
Functions obtained by I C bus control
User menu: HUE, COLOR, GAIN, OFFSET, MONI-R, MONI-G, MONI-B, IRE, SYNC ON G,
and INPUT SEL
Service menu: PICTURE, G DRIVE, B DRIVE, SUB-BRIGHT, and VBS Y
Other functions: HALFTONE
Remarks:
The object to be handled is an I
2
adjustment is stored in I C-EEPROM on the VPR board. During start, the SY-282 board reads data from
2
I C-EEPROM and initializes the IC on the VPR-63 board. These set values can be changed (readjusted)
in the service man mode. No communication is performed when I
Screen display-related signals
Purpose
Produces a pulse signal for screen display.
Signal line name I/O
OSD-R Output
OSD-G Output
OSD-B Output
OSD_BLK Output
OSD_ON_NOFF Output
OSD_HD Input
OSD_VD Input
Input signal switching control
Purpose
Specifies an input signal.
INPUT_SEL1 Contents
L VIDEO/S-VIDEO
H RGB
Remarks:
VIDEO and S-VIDEO are switched by I
OEP-3 V1 (UC)
Description
Serial data clock
Serial data
Serial data transfer enable
2
C-compatible circuit on the VPR-63 board. The center value for
Description
Screen display control data (R)
Screen display control data (G)
Screen display control data (B)
Screen display control data (Blanking)
Batch control of screen display superimposition (yes/no)
Timing pulse (H-SYNC)
Timing pulse (V-SYNC)
2 C control.
H:active
H:active
H:active
2
C-CTS is in the send disable (L) state.
H:active
H:active
H:active
H:active
H:active
Sync negative
Sync negative
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