Hughes Jvc 200 Projector Service Manual

Chapter 2---System Description 
RED_VICGREEN_VICBLUE_VICH_VICV_VIC
IIC/SEL_VICIIC_CLKIIC_DATAIIC_INT
+5.1Vstby+5.1V+15V-15V
4:1 
VIDEO
MUX
and
BUFFERS
RED_CH1RED_CH2RED_CH3RED_CH4
GRN_CH1GRN_CH2GRN_CH3GRN_CH4
BLU_CH1BLU_CH2BLU_CH3BLU_CH4
HOR_CH1HOR_CH2HOR_CH3HOR_CH4
VER_CH1VER_CH2VER_CH3VER_CH4
 
Figure 2-7.  Quad Input RGB VIC 
The same functions performed by the Standard RGBHV VIC are 
performed by the Quad Input RGB VIC. The description of 
operation and pinouts are the same as the Standard RGBHV VIC....

  Chapter 2---System Description 
• LED indication 
• IIC serial bus interface 
RED
GRN
BLU
HOR
/SELECT
Y/G
Pb/B
Pr/R
IIC_CLK
IIC_DATA
+5.1V_STBY
+5.1V
+15V
-15V
B2
B4
B6
B8
B12
B13
A13
A16
B16
B15
B14
Pin callouts are to P12, P14, or P18, depending on whichVIC slot is being used.
 
Figure 2-8.   HDTV YPbPr VIC Input/Output Diagram. 
This VIC accepts two types of video signals, color components 
(YPbPr) and RGB signals. In either case the output of this VIC is 
RGB type signals. If the inputs are color...

Chapter 2---System Description 
 
Table 2-4.  HDTV VIC IIC Interface 
I/O Bits Information Description 
I 1 /SEL_YPbPr Selects YPbPr input mode for the YPbPr_VIC.
Low = Selected YPbPr input mode. 
I 1 /SEL_RGB Selects RGB input mode for the YPbPr_VIC.
Low = Selected RGB input mode. 
I 8 GAMMA Data for adjustment of Gamma correction  
I 8 COLOR Data for adjustment of color 
I 8 HUE Data for adjustment of hue 
I 8 SHARPNESS Data for adjustment of sharpness 
O 4 VIC_ID VIC identification lines. 0001 for...

  Chapter 2---System Description 
HOR Composite horizontal / vertical  sync signal 
System controller board 
INPUTS DESCRIPTION 
IIC_CLK IIC clock line. Unidirectional clock line for control of synchronous 
data transfer over the IIC bus interface. 
IIC_DATA IIC data line. Bidirectional serial line for synchronous data transfer 
between system control board and the YPbPr_VIC. 
OUTPUTS DESCRIPTION 
/IIC_INT IIC interrupt line. YPbPr_VIC does not initiate any  interrupt 
Low Voltage Power Supply 
INPUTS...

Chapter 2---System Description 
• Tint, sharpness, and color adjustment 
• LED indication of Composite or S-video 
• IIC serial bus interface 
R
G
B
/H
/SELECT
Comp
Y in
C in
IIC_CLK
IIC_DATA
+5.1V
+15V
B2
B4
B6
B8
B12
B13
A13
B16
B15
Pin callouts are to P12, P14, or P18, depending on whichVIC slot is being used.
/VB10
 
Figure 2-9.   Quad Standard Decoder I/O Diagram. 
LED Indication 
There are two LEDs on this VIC. The LED on the right side of the 
board glows when Composite Video is selected and the...

  Chapter 2---System Description 
I TINT Data for adjustment of Hue  
I COLOR Data for adjustment of color 
I SHARP Data for adjustment of Sharpness 
I VTR Selection of VTR mode 
O VNR Selection of Video Noise Reduction mode 
Quad Standard Decoder VIC I/O  
This section provides a description of the inputs to and outputs 
from the Quad Standard Decoder VIC. The I/O descriptions are 
arranged by the source/destination of the signal. The format used 
is such that the assembly communicated with is used as...

Chapter 2---System Description 
Low Voltage Power Supply 
INPUTS DESCRIPTION 
+5.1 V +5.1 V supply for use by The Quad Decoder VIC. 
+15 V + 15 V supply for use by the Quad Decoder VIC. 
Interlocks and protection 
None 
Model 200 Service Manual  2-23  

  Chapter 2---System Description 
2.3.4  Video Processor PCB 
The Video Processor Board (VPB) is the bottom-most card (see 
Figure 5-1) in the card cage. It is connected directly to the 
Backplane board through 2 connectors. When an external signal 
is being received, the VPB provides Horizontal Sync, Vertical 
Sync, and Green Sync signals to the Raster Timing Generator 
(RTG) board. It also provides three primary color signals, and G2, 
G1 bias and DC RESTORE control signals to the Video Amplifier...

Chapter 2---System Description 
B31   RED_VIC#1B29   RED_VIC#2B27   RED_VIC#3
B23   GRN_VIC#2B21   GRN_VIC#3B19   BLU_VIC#1
B25   GRN_VIC#1
B24  RED_THRESHB23  GRN_THRESHB22  BLU_THRESH
B25  BLU_SENS
B17   BLU_VIC#2B15   BLU_VIC#3B13   H_VIC#1
B9     H_VIC#3B7     V_VIC#1B5     V_VIC#2
B11   H_VIC#2
B3     V_VIC#3
GRN_G2    A20BLU_G2     A21 G1_BIAS    A11 
RED_G2    A19 B20  GRN_BEAMB21  BLU_BEAMA13  /VA_OK (/HV_ENA)
B19  RED_BEAM
A8         +5.1VA9          +15V    A10        -15V
B12   IIC_CLKB13...

  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...