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Hughes JVC Projector 230 Sc Service Manual

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Page 41

Chapter 2---System Description
Model 230 Service Manual2-29
HIGH VOLTAGE POWER SUPPLY
INPUTS DESCRIPTION
G1_SUPPLY Supply for G1 grid of CRTs. About -200 V
G2_SUPPLY Supply for G2 (screen) grid of CRTs. About 1200 V
RED_FOCU
S
GRN_FOCU
S
BLU_FOCU
SFocus supply for CRTs. about 7 KV
OUTPUTS DESCRIPTION
ARC_GND CRT ground (anode supply return line)
HORIZONTAL/VERTICAL DEFLECTION BOARD
INPUTS DESCRIPTION
/SWEEP_OK Deflection detection line. open collector, low = good deflection
RASTER TIMING GENERATOR BOARD...

Page 42

Chapter 2---System Description
2-30Model 230 Service Manual
RED_HEAT-
GRN_HEAT-
BLU_HEAT-Negative side (return line) of the heater voltage for CRTs. Ground
level.
RED_
CATHODE
GRN_
CATHODE
BLU_
CATHODEVideo output signals of the VAB. about 40 VPP with peak voltage of
about 70 V.
RED_GRID2
GRN_GRID2
BLU_GRID2G2 (screen) supply of CRTs. about 600 to 800 V
OUTPUTS DESCRIPTION
ARC_GRD Ground of CRTs ( anode supply return line).
SYSTEM POWER SUPPLY
INPUTS DESCRIPTION
+6.2 V +6.2 V supply line (heater...

Page 43

Chapter 2---System Description
Model 230 Service Manual2-31
•  Fault monitors the HVPS, LVPS, Arc Lamp, and fans.
•  Provides interboard communication via the IIC serial bus.
•  Controls Zoom and Focus of the Projection Lens.
•  IIC Interface control
•  Provides Video Overlays
•  X and Y convergence control
•  Threshold and Sensitivity for shading
• I/O control
•  Two RS-232 serial interface ports
•  Infrared (IR) remote control interface. Accepts input from front or rear
IR detectors.
•  A 5-wire JTAG...

Page 44

Chapter 2---System Description
2-32Model 230 Service Manual
P11
B23
B24
B28
B29
B32 B27
B26
B31
B30
Lens Zoom
Lens Focus
/LV_ENA
/FAN_ENA
/LAMP_ENA/HV_OK/LV_OK
/LAMP_LIT/LAMP_OK
P10
B31
B30
A32
A31
A30
A   B
20-20
21-21
22-22
23-23
24-24
25-25
26-26
27-27
28-28
29-29+5.1V stby
+5.1V
+15V
-15V
GND
ODD_FIELD
SRC_VALID
H_DRIVE_SC
V_DRIVE
B9
B10
B2
B1
B3
RED_OVER
GRN_OVER
BLU_OVERB18
B17
B16
P10
Y_RED_CONV
Y_GRN_CONV
Y_BLU_CONV
X_RED_CONV
X_GRN_CONV
X_BLU_CONV
B4
B5
B6
B1
B2
B3
BLU_THRES
GRN_THRES
RED_THRES...

Page 45

Chapter 2---System Description
Model 230 Service Manual2-33
Table 2-11.  System Controller Board I/O signals
VIDEO PROCESSOR BOARD
I/O DESCRIPTION
IIC_CLK IIC clock line. Clock line for control of synchronous data transfer
over the IIC bus interface.
IIC_DATA IIC data line. Serial line for synchronous data transfer of the
following data between Video Processor Board and SCB board.
I=Input, O=Output.
I     BEAM CURRENT
I     OK DETECT
O    RED_CONT
O    GRN_CONT
O    BLU_CONT
O    BRIGHTNESS
O    RED_G2
O...

Page 46

Chapter 2---System Description
2-34Model 230 Service Manual
BLU_SENS Sensitivity correction information for BLU. Real time data at O volt to
1 volt.
GRN_SENS Similar to BLU_SENS
RED_SENS Similar to BLU_SENS
RASTER TIMING GENERATOR
INPUTS DESCRIPTION
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...

Page 47

Chapter 2---System Description
Model 230 Service Manual2-35
X_BLU_
CONVBlu X convergence waveform. The amplitude for full scale correction
is about 1 VPP.
Y_RED_
CONVRed Y convergence waveform. The amplitude for full scale
correction is about 1 VPP.
Y_GRN_
CONVGrn Y convergence waveform. The amplitude for full scale correction
is about 1 VPP.
Y_BLU_
CONVBlu Y convergence waveform. The amplitude for full scale correction
is about 1 VPP.
CORR_
SYNCSquare wave HCT level synchronous signal for horiz axis....

Page 48

Chapter 2---System Description
2-36Model 230 Service Manual
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...

Page 49

Chapter 2---System Description
Model 230 Service Manual2-37
OUTPUTS DESCRIPTION
FAN_ENA Signal to enable the 24V standby power
LV_ENA Signal to enable the LVPS
ARC LAMP POWER SUPPLY
INPUTS DESCRIPTION
/LAMP_OK Informs SCB that the Arc Lamp is installed, temperature is within
limits, and lamp cooling blower is working
/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_FOCUSSignal to lens focus motor...

Page 50

Chapter 2---System Description
2-38Model 230 Service Manual
•  Horizontal and vertical phase adjustments
•  Interlace detection and odd field pulse generation
•  Horizontal frequency band selection
•  Horizontal line count and vertical count generation
• IIC interface
•  Video clamp pulse generation
•  Source change detection
•  HVPS sync generation
•  Horizontal deflection enable circuitry
The RTG I/O Diagram (Figure 2-13) and the list of inputs and outputs (Tables 2-
12 and 2-13) provide information...
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