CSA 803C Service Manual 3

Horizontal
Sweep
Circuit
HĆSIZEAdjustment
HĆPOSAdjustment
HĆLINAdjustment
VERTSIZE Adjustment
VERTPOS Adjustment
RasterScan CRT
Highand
GridVoltage
Generator
A7CRT
SocketBoard
(See
Figure9Ć5)
Vertical
Sweep
Circuit
Synchronization
Grid
Bias
Red
Green
Blue
REDAdjustment
GREENAdjustment
BLUEAdjustment
FromA15
MMU
Beam
Current
Limit
16kV
SCREEN,FOCUS
Red
Green
Blue
SCREEN
FOCUS
Coils
Coils
Heater
Degauss
Figure 9Ć6:ăA8 CRT Driver Board Block Diagram
J78
GPIBReq
-GPIBGr
RPD0-D7
RPA1-A4
-GPIBSel
GPIBClk
-RPReset
GPIB
Controller
DO0-DO7
T6
ControlSignal
Control
GPIB
Control
Buffer
LEDA
GPIB
Control
Buffer
-StandardRS
Standard
RSĆ232ĆC
Controller
Reset
Inverter
GPIBInterface
J50
RPD0-D7
RPA1-A4
RSĆ232ĆC
Transceiver
Buffer J51
RSĆ232ĆC
Transceiver
Buffer
StandardRSĆ232ĆC Interface
Clock
Generator
Reset
Hi
Low
-PrinterSelect
Printer
Controller
Data
Buffer
J111
Data
Buffer
PrinterInterface
PortA
PortB
N/T
Data
Buffer
PortC
RPD0-D7
RPA1-A4
Figure 9Ć7:ăA12 Rear Panel Assembly Block Diagram