Hughes Jvc 200 Projector Service Manual

Chapter 2---System Description 
H_DRIVE Square wave 50% duty cycle synchronized to selected horiz sync 
V_DRIVE Square wave negative going pulse synchronized to selected vertical 
sync with pulse width of about 4 horiz lines 
H_F2V DC voltage proportional to horiz frequency 
OUTPUTS DESCRIPTION 
ISYNC_CLK 5 mHz clock used to generate the internal sync signals 
IIC_CLK IIC clock line. Unidirectional clock line for control of synchronous 
data transfer over the IIC bus interface. 
IIC_DATA IIC data line....

  Chapter 2---System Description 
IIC_DATA IIC data line. Bidirectional serial line for synchronous data transfer 
between the SCB and the Horizontal/Vertical Deflection board. 
I=Input, O=Output. 
O    V_RED_LIN_CONTROL 
O    V_GRN_LIN_CONTROL 
O    V_BLU_LIN_CONTROL 
O    V_RED_EDGE_CONTROL 
O    V_GRN_EDGE_CONTROL 
O    V_BLU_EDGE_CONTROL 
O    L/R_KEY_CONTROL 
O    L/R_PIN_CONTROL 
O    WIDTH_CONTROL 
O    H_RED_CENT_CONTROL 
O    H_GRN_CENT_CONTROL 
O    H_BLU_CENT_CONTROL 
O    V_RED_CENT_CONTROL...

Chapter 2---System Description 
/LAMP_LIT Informs the SCB that the Arc Lamp is lit or not lit 
OUTPUTS DESCRIPTION 
 /LAMP_ENA Enables ALPS power 
Projection Lens 
OUTPUTS DESCRIPTION 
LENS_FOCUS Signal to lens focus motor 
LENS_ZOOM Signal to lens zoom motor 
Front IR 
INPUTS DESCRIPTION 
/FRONT_IR Input from front infrared receiver 
/REAR_IR Input from rear infrared receiver 
  
 
Model 200 Service Manual  2-39  

  Chapter 2---System Description 
2.3.7  Raster Timing Generator PCB 
The Raster Timing Generator (RTG) is located in the electronic 
card cage (Figure 5-1). The RTG I/O diagram (Figure 2-13) and 
the list of inputs and outputs (Tables 2-10 and 2-11) provide 
information to allow the technician to perform module level 
troubleshooting. 
The following functions are provided by RTG board: 
• Internal sync generation 
• Sync detection and selection 
• Serration and equalization pulse removal 
• Phase locked...

Chapter 2---System Description 
Horizontal/Vertical Deflection Board uses these lines for proper 
selection of retrace times. 
 
B3     V_SYNCB4    H_SYNCB5    G_SYNC
HVPS_SYNC    A14
 A5    GRN_INPUT
A32        +5.1V
A31         +15V
    B30        -15V
V_DRIVE        B15 
B19     ISYNC_CLK
B27     IIC_CLKBLANKING      B1CLAMP            B2
ODD_FIELD        B23SOURCE_VALID    B24
280_CLK        B21
B28     IIC_DATA
J13J13
FROMSCB
FROM VPB
FROMLVPS
TOSCB
TOVPB
RASTER
TIMING
GENERATOR
H_BAND1...

  Chapter 2---System Description 
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 indicates an operational RTG 
board 
O 2 RTG_MODEL The revision of the RTG board...

Chapter 2---System Description 
Video Processor Board 
INPUTS DESCRIPTION 
V_SYNC Input vertical sync  
H_SYNC Input horizontal or composite sync 
G_SYNC Sync on green signal which is stripped for the green video 
GRN_INPUT Buffered version of green video 
OUTPUTS DESCRIPTION 
Clamp A negative going video clamp signal with about 3 % duty cycle 
Blanking  Blanking signal composed of right, left, top and bottom blanking 
Horizontal/Vertical Deflection Board 
INPUTS DESCRIPTION 
/H_ 
FLYBACK 
Not used by...

  Chapter 2---System Description 
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 V. Not used by RTG board. 
 
Interlock and protection: 
Input 
None 
Output 
The RTG will disable the Horizontal Deflection Board by placing a 
high on the /H_ENABLE line during any of following...

Chapter 2---System Description 
2.3.8   Horizontal/Vertical Deflection PCB 
The HVD board is located on the top side of the deflection cage in 
front of the electronic card cage. 
The Horizontal/Vertical Deflection Board I/O diagram (Figure 2-14) 
and the list of inputs and outputs (Tables 2-10 and 2-11) provide 
information for the technician to perform module level 
troubleshooting. 
The following functions are provided by the HVD board: 
• Horizontal raster centering for all three colors 
• Horizontal...

  Chapter 2---System Description 
 
Figure 2-14.  Horizontal/Vertical Deflection PCB I/O Diagram. 
 
Table 2-10.  Horizontal/Vertical Deflection IIC Data Interface 
Input / 
Output 
No. 
of 
bits Information 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  
I 8 V_BLU_LIN_CONTROL Data for adjustment of blue vertical 
linearity  
2-46 Model 200 Service Manual