JVC 250 Service Manual page 115

Chapter 5---Electronics
RGBHV VIC - Inputs
R - red image from source input (0.7-1.0 Vpp).
G - green image from source input (0.7-1.0 Vpp).
B - blue image from source input (0.7-1.0 Vpp).
H - horizontal sync from source input
V - vertical sync from source input
+15 V - (not used)
-15 V - (not used)
+5.1 V - power for digital circuitry
+5.1 V Stdby (not used)
IIC CLK - IIC clock line
IIC DATA - IIC data line
IIC SINT - IIC interrupt line
RGBHV VIC - Outputs
RED_VIC - red image to the Video Processor PCB (0.7-1.0 Vpp).
GRN_VIC - green image to the Video Processor PCB (0.7-1.0 Vpp).
BLU_VIC - blue image to the Video Processor PCB (0.7-1.0 Vpp).
H_VIC - horizontal sync to the Video Processor PCB
V_VIC - vertical sync to the Video Processor PCB
/SEL_VIC - VIC select line to the Video Processor PCB
RGBHV VIC - Operation
The RGBHV VIC receives the separate red, green, blue image inputs and
horizontal, and vertical sync inputs from the source input device and passes them
directly through to the Video Processor PCB without any signal processing. The
VIC receives a SELECT command from the System Controller PCB through the
IIC data bus to activate the VIC. The VIC sends a /SEL_VIC to an internal Input
Switcher (Mux) on the Video Processor PCB tell it which VIC is selected. An
operator selects the VIC in the Channels Menu (see section 4-6 in the User's
Guide).
A green LED is illuminated when the VIC is selected.
RGBHV VIC - Service Adjustments
There are no service adjustments on the RGBHV VIC
RGBHV VIC - Remove and Replace
Tools Needed
#0 Posi-drive Phillips-head screwdriver
5-60 Model 250 Service Manual