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Chapter 2---System Description
Raster Timing Generator Board
INPUTS DESCRIPTION
BLANKING
Blanking signal. logic F type
CRTs
OUTPUTS DESCRIPTION
RED_FOCUS
GRN_FOCUS
BLU_FOCUS
Focus supply of CRTs. about 7 KV.
RED_GRID1G
RN_GRID1BL
U_GRID1
Grid 1 (G1) signal of CRTs.
RED_HEAT+
GRN_HEAT+
BLU_HEAT+
Positive side of the heater voltage for CRTs. About 6.2 V.
RED_HEAT-
GRN_HEAT-
BLU_HEAT-
Negative side (return line) of the heater voltage for CRTs. Ground
level.
RED_
CATHODE
GRN_
CATHODE
BLU_
CATHODE
Video output signals of the VAB. about 40 VPP with peak voltage of
about 70 V.
RED_GRID2
GRN_GRID2
BLU_GRID2
G2 (screen) supply of CRTs. about 600 to 800 V
OUTPUTS DESCRIPTION
ARC_GRD Ground of CRTs ( anode supply return line).
System Power Supply
INPUTS DESCRIPTION
+6.2 V +6.2 V supply line (heater voltage).
+15 V +15 V supply for use by Video Amplifier Board.
-15 V -15 V supply for use by Video Amplifier Board.
+80 V +80 V supply for use by Video Amplifier Board.
Interlocks and protection:
None
Model 200 Service Manual 2-33