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SECTION2
Operation
To avoid possible contamination,
always grasp the card by the side
edges, Do not touch the edge connectors
of the card and do not touch
board surfaces or components.
When not installed in a mainframe, keep
the card in the bag and store in the original packing carton.
Dirt build-up over a period of time is another possible source of con-
tamination. To avoid this problem, operate the mainframe and scanner
card only in a clean environment.
If the card should
become contaminated,
it should be thoroughly
cleaned as explained in paragraph
4.2.
2.3
EQUIVALENT CIRCUIT
Figure 2-l shows the equivalent circuit of the Model 7169.
Each channel is a single-pole, double throw (l-Form C) isolated switch.
The factory installed jumper in series with the COMMON terminal can
be removed if a limiting resistor is required. Two undedicated
on card
buses are available for intracard connections
Figure 2-l.
Model 7169 Simplified Schematic
2.4
MULTI-CARD CONFIGURATIONS
Typically, multi-card systems are configured by connecting one or more
of the terminal blocks of all the scanner cards together. An example of
2-2
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