Chapter 2---System Description
I RED_G2 Red G2 Control
I GRN_G2 Green G2 Control
I BLU_G2 Blue G2 Control
I WHT_BOOST Gamma correction
I BLK_BOOST Gamma correction
I G1_BIAS G1 bias level
O /VA_OK Issues to SCB that Video Amplifier
is OK
O BEAM_CURRENT Beam current control
O OK_DETECT Issues to SCB that VPB is OK
Video Processor I/O
This section provides a comprehensive description of the inputs to
and outputs from the VPB. The I/O descriptions in Table 2-7 are
arranged by the source/destination of the signal. The format used
is such that the assembly communicated with is used as the
primary heading of each group of signals. Those signals are
further subdivided into inputs and outputs. Inputs refers to an input
to the VPB, while output refers to an output from the VPB.
Table 2-7. Video Processor I/O signals
S
stem Controller Board
INPUT DESCRIPTION
RED_OVER Red signal of on-screen menu and/or internal test pattern
GRN_OVER Similar to RED_OVER
BLU_OVER Similar to RED_OVER
OVERLAY Overlay control signal
RED_SENS Sensitivity correction information for red. Real time data at
0 volt to 1 volt.
GRN_SENS Similar to RED_SENS
BLU_SENS Similar to RED_SENS
RED_THRES Threshold correction information for red. Real time data at
0 Volt to 1 Volt
2-26 Model 200 Service Manual
