Hughes JVC Projector 230 Sc Service Manual

Chapter 2---System Description
Model 230 Service Manual2-39
B3     V_SYNC
B4    H_SYNC
B5    G_SYNC
HVPS_SYNC    A14  A5    GRN_INPUT
A32        +5.1V
A31         +15V
    B30         -15VV_DRIVE        B15  B19     ISYNC_CLK
B27     IIC_CLKBLANKING      B1 CLAMP            B2
ODD_FIELD        B23 SOURCE_VALID    B24
280_CLK        B21
B28     IIC_DATA
J13
J13
FROM
SCBFROM 
VPB
FROM
LVPSTO
SCB
TO
VPB
RASTER
TIMING
GENERATOR
H_BAND1           B8 H_BAND0           B7
H_BAND2           B9
H_F2V...

Chapter 2---System Description
2-40Model 230 Service Manual
I 9 Right blanking Data for adjustment of right blanking
I 9 Left blanking Data for adjustment of left blanking
I 12 Top blanking Data for adjustment of top blanking
I 12 Bottom blanking Data for adjustment of bottom blanking
I 8 Horz. phase Data for adjustment of horizontal phase
I 12 Vert. phase Data for adjustment of vertical phase
O 3 Frequency bands The frequency band associated with the
current signal
O 1 /RTG_OK A low on this line...

Chapter 2---System Description
Model 230 Service Manual2-41
SOURCE_
VALIDThis signal indicates a new source (or valid). A high indicates a valid
stable signal and low indicates change in input signal
ODD_FIELD Square wave with 50 % duty cycle which is low during the odd field
of an interlace signal. This signal is high for noninterlaced signals
280_CLK Square wave signal, 50 % duty cycle, 280 times the frequency of
horizontal sync. This clock is synchronized to the horizontal sync.
VIDEO PROCESSOR BOARD...

Chapter 2---System Description
2-42Model 230 Service Manual
CONVERGENCEDEFLECTION BOARD
OUTPUT DESCRIPTION
V_DRIVE Square wave negative going pulse synchronized to the selected
vertical sync with pulse width of about 4 horizontal periods
LOW VOLTAGE POWER SUPPLY
INPUTS DESCRIPTION
+5V Power for digital portion of RTG board
+15V Power for the phase locked loop and the supporting circuitry of
RTG board
-15V Power for the phase locked loop and the supporting circuitry of
RTG board
+5.1V_STBY Stand by + 5.1...

Chapter 2---System Description
Model 230 Service Manual2-43
•  Horizontal retrace switch network
•  Left/right pincushion and keystone correction
•  Drive main deflection coils to provide horizontal raster scan for all
three CRTs
•  Drive main vertical coils to provide vertical raster scan for all three
CRTs
•  Vertical linearity adjustments individually for all three colors.
•  Vertical raster centering for all three colors
• IIC interface
IIC Interface
All adjustments for the HVD board are performed by...

Chapter 2---System Description
2-44Model 230 Service Manual
Figure 2-14.  Horizontal/Vertical Deflection PCB I/O Diagram.
Table 2-14.  Horizontal/Vertical Deflection IIC Data Interface
INPUT /
OUTPUTNO.
OF
BITSINFORMATION DESCRIPTION
I 8 V_RED_LIN_CONTROL Data for adjustment of red vertical
linearity
I 8 V_GRN_LIN_CONTROL Data for adjustment of green vertical
linearity 

Chapter 2---System Description
Model 230 Service Manual2-45
I 8 V_BLU_LIN_CONTROL Data for adjustment of blue vertical
linearity
I 8 V_RED_EDGE_CONTROL Data for adjustment of red vertical
edge linearity
I 8 V_GRN_EDGE_CONTROL Data for adjustment of green vertical
edge linearity
I 8 V_BLU_EDGE_CONTROL Data for adjustment of blue vertical
edge linearity
I 8 L/R_KEY_CONTROL Data for adjustment of left / right
keystone correction
I 8 L/R_PIN_CONTROL Data for adjustment of left / right
pincushion correction
I...

Chapter 2---System Description
2-46Model 230 Service Manual
Table 2-15.  Horizontal/Vertical Deflection I/O signals
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 the System Controller Board and the HVD Board.
OUTPUTS DESCRIPTION
/IIC_SINT IIC interrupt line. This is not used by HVD Board.
VIDEO PROCESSOR...

Chapter 2---System Description
Model 230 Service Manual2-47
OUTPUTS DESCRIPTION
H_OUT_
FLYBACKHorizontal output flyback pulse, about 800 VPP
H_LOCK+ Horizontal interlock for yoke connectors. This should be about 5 V
when closed  or 15 V when open.
H_RED+ Output of horiz. red centering (also top of the red horiz. yoke). About
+ 5 VDC.
H_GRN+ Output of horz. green centering (top of green horz. yoke). About + 5
VDC
H_BLU+ Output of horiz. blue centering (top of blue horiz. yoke). About + 5
VDC.
V_RED+...

Chapter 2---System Description
2-48Model 230 Service Manual
HF_2V Horizontal frequency to voltage converter. a DC signal proportional
to horiz. frequency. About 4.2 V at 90 kHz.
H_DRIVE Horiz. drive pulse, 50 % duty cycle HCT level signal
SYSTEM POWER SUPPLY
INPUTS DESCRIPTION
+5 V + 5 V supply for use by HVD and Scan Reversal Boards
+15 V + 15 V supply for use by HVD and Scan Reversal Boards
-15 V - 15 V supply for use by HVD and Scan Reversal Board
+80 V + 80 V supply for use by the switching supply of...