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Chapter 5---Electronics
5-46 Model 250 Service Manual
Figure 5-27
Video Amplifier PCB I/O Diagram for the Video Processor PCB and
CRTs.
Video Amplifier PCB - Outputs
RGB_BEAM - Cathode beam current sense lines (about 1 V per 100 µA).
RGB_CATHODE - image output signal to CRTs (about 40 Vpp with peak
voltage of 70 V).
RGB_G
1
- G
1
voltage to CRTs (Blanking pulse to CRT).
RGB_G
2
- G
2
voltage for CRTs (about 600-800 V).
RGB_HEAT (pos.) - positive side of the CRT heater voltage (about 6.2 V).