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5-12
5.5
Principles of operation
The following paragraphs discuss the basic operating
principles for the Model 7012, and can be used as an
aid in troubleshooting the matrix card. The schematic
drawing of the matrix card is shown on drawing num-
ber 7012-106, located at the end of Section 6.
5.5.1 Block diagram
Figure 5-8 shows a simpli
Þ
ed block diagram of the
Model 7012. Key elements include the relay drivers
and relays, as well as the ROM, which contains card ID
and con
Þ
guration information. These various elements
are discussed in the following paragraphs.
Figure 5-8
Model 7012 block diagram
To Mainframe
CLK
Data
Strobe
Enable
Relay
Drivers
U100-
U104
Relays
User connections
ID CLK
ID DATA
ROM
U105
+3.5V (Steady State)
+5.7 (
≈
100 msec during
relay actuation)
Relay
Power
Control
Q100, Q101
U106, U107
+6V, +14.6V
To Mainframe
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