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Chapter 5---Electronics
5-44 Model 250 Service Manual
Video Amplifier PCB - Inputs
RGB_VIDEO - image pre-amp signals from the Video Processor PCB (about 0.5
Vpp).
RESTORE - image DC restorations pulse from Video Processor PCB, logic level
positive going 4% duty cycle.
BLANKING - Blanking signal, logic F type.
G
1
_SUPPLY - supply for G
1
grid on CRTs from High Voltage Power Supply
(about -150 V).
G
1
_BIAS - brightness control line from Video Processor PCB (0-5 VDC).
RGB_G
2
- G
2
(black level) control lines from Video Processor PCB (0-3.1 V).
G
2
_SUPPLY - supply for G
2
grid on CRTs from High Voltage Power Supply
(about 1200 V).
RGB_ FOCUS - Focus supply for CRTs from the High Voltage Power Supply
(approximately 7 kV).
SWEEP_OK - deflection status line from the Horizontal Vertical Deflection PCB.
+80 V - from the Low Voltage Power Supply
±15 V - input power for the analog circuitry from the Low Voltage Power Supply.
6.2 V - input power for the CRT filaments heaters from the Low Voltage Power
Supply.