Video Amplifier Pcb - Hughes JVC 100 Service Manual

Table 2-13 Video Amplifier I/O signals.

Video Amplifier PCB

Inputs
+15V
-15V
+6.2V
G
1
REG_VP
RESTORE
Video Processor
VIDEO IN
Regulator
G CTRL
2
REG_G
2
GND
HVPS
G SUPPLY
2
ARC GND
Outputs
Video Processor
/ VAMP_OK
BEAM
CRT
CATHODE
G
1
HEAT +
HEAT -
ARC GND
2-48
Description
Power for analog circuitry
Power for analog circuitry
CRT Filament voltage
DC Bias + Blanking
Supply voltage for Video Amplifier PCB.
DC Restore after blanking
Video signal in
Control signal to adjust G
+900 V to other Video Amplifier PCBs
Ground
G supply voltage = 1 kV
2
Ground
VA PCB status line. Low = good VA PCB. High = Bad
VA PCB (This signal is called /HV_ENABLE at the
HVPS).
CRT beam current. Feedback to Video Processor PCB
for beam current limiting. About 1 volt per 100 UA
Video drive signal to CRT
DC bias + Blanking
+ 6.2V CRT Filament Voltage
Ground
Ground
Chapter 2---System Description
2
Model 100 Service Manual