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Block Diagram Descriptions
CSA 803C Service Manual
3Ć27
The A20/A21 Head Interconnect (Power Only) boards provide power only to
the interface between the sampling head connectors (J11, J12) and ribbon
cable W150. W150 connects to the A26 M/F Acquisition Interface board and
carries the control status and power.
The A22/A23 Head Interconnect boards provide the interface between the
sampling head connectors (J13, J14) and ribbon cable W150 and coaxial
cables W100 and W200. W150 connects to the A26 M/F Acquisition InterĆ
face board and carries the control status and power. W100 and W200 conĆ
nect to the A27 Acquisition Analog board and carry the signal from the
sampling heads.
The A26 M/F Acquisition Interconnect board provides and distributes the
power to the interconnections between the following boards:
H A27 Acquisition Analog board
H A28 Acquisition MPU board
H A22/A23 Head Interconnect boards
See Figure 9Ć13 for the block diagram of this board.
The A26 M/F Acquisition Interconnect board also has a precision voltage
reference (V) to furnish the ±5 V reference required by the A27 Acquisition
Analog board.
A20/A21 Head
Interconnect (Power
Only) Boards
A22/A23 Head
Interconnect Boards
A26 M/F Acquisition
Interconnect Board