Hughes JVC 100, Service Manual

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Chapter 2---System Description
2-38 Model 100 Service Manual
Deflection Processor PCB
X BLU_SIG Similar to X RED SIG.
Y RED_SIG Red Y-axis geometry correction data.
Y GRN_SIG Similar to Y RED SIG.
Y BLU_SIG Similar to Y RED SIG.
VERT. SIG Vertical sync signal
Horizontal Deflection
H_PS_INFO Horizontal sweep feedback signal.
WIDTH Controls the green image width.
H_GEO_SIG L/R Pincushion and Keystone combined into one signal.
HVPS
H_FOCUS_SIG Horizontal focus parabola.
V_FOCUS_SIG Vertical Focus parabola.
Vertical Convergence Deflection PCB
The Vertical Convergence Deflection PCB is the middle circuit board, above the
Deflection Processor PCB and below the shorter Horizontal Deflection PCB, in
the Electronics Module card cage (see Figure 4-10).
The Vertical Convergence Deflection PCB I/O diagram (see Figure 2-15) and the
list of inputs and outputs (see Table 2-10) provide information for the technician
to perform module level troubleshooting.
The following functions are provided by the Vertical Convergence Deflection
PCB:
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Horizontal raster centering for all three colors
!
Combines Convergence data from the System Controller/ RTG PCB with
Geometry data signals (X_RGB_SIG and Y_RGB_SIG)
!
Scan reversal via jumper positioning
!
RGB Rotation
!
Drive for Vertical Deflection Coils
!
Vertical Sweep Failure (Vert_OK)
!
Interlock Status for all the Yoke connections