Chapter 2---System Description
From | J67 | RED_VIDEO |
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VPB |
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| J68 |
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From VPB 23 | RESTORE |
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From RTG 21 | BLANKING |
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From HVPS 1 | G1 SUPPLY |
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From VPB | 2 | G1 BIAS |
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VIDEO
AMPLIFIER
BOARD
From | 11 | RED | _G2 | ||||
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15 | BLU_G2 | ||||||
J69 |
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From HVPS 1 | G2 SUPPLY | ||||||
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J68 |
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From HVDB 19 | /SWEEP | _OK | |||||
From | 3 | + 8OV |
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7 | + 15V | ||||||
LVPS | 5 | + 6.2V |
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RED_BEAM | 12 | To VPB | ||||
RED _ | CATHODE |
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RED _GRID1 | 9 | |||||
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RED _ | GRID2 |
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RED _HEAT+ | 6 | CRT | ||||
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RED _HEAT- | 7 |
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ARC _ | GND | 3 |
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GRN_BEAM |
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GRN _CATHODE | 8 |
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GRN _GRID1 | 9 |
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GRN _GRID2 | 10 | To GRN | ||||
GRN _ | HEAT+ |
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GRN _HEAT- | 7 |
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ARC_GND | 3 |
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BLU_BEAM | 16 | To VPB | ||||
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BLU_CATHODE | 8 | |||||
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BLU_GRID1 | 9 | To BLU | ||||
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BLU_GRID2 | 10 | |||||
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BLU_HEAT+ | 6 | |||||
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BLU_HEAT- | 7 |
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ARC_GND | 3 |
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/VA_OK | 18 | To VPB | ||||
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ARC_GND |
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Figure 2-11. Video Amplifier PCB, Block Diagram.
CRT interface for Focus, heater voltages and ARC ground
The three CRT sockets are part of the VAB. They provide the necessary interface for the input of the three CRTs. The Focus voltage for each color is connected directly to the socket of each CRT.
The VAB provides ARC grounds for each CRT which are used to protect against arcing of the CRT anode supply.
IIC Interface
The VAB does not use the IIC interface. All adjustments are accomplished by the control lines coming from the Video Processor Board.
The Video Amplifier Board I/O
This section provides a description of the inputs to and outputs from the VAB. The I/O descriptions are arranged by the source/destination of the signal. The assembly communicated with is used as the primary heading of each group of signals. Those signals are subdivided into inputs and outputs. Input refers to an Input to the VAB, output refers to an output from the VAB.
Model 200 Service Manual |
