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Service Information
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.
To Mainframe
To Mainframe
Figure 5-8
Model 7012 block diagram
5-12
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CLK
Relay
Data
Drivers
Strobe
U100-
Enable
U104
ID CLK
ROM
ID DATA
U105
+6V, +14.6V
5.5.1 Block diagram
Figure 5-8 shows a simpliÞed block diagram of the
Model 7012. Key elements include the relay drivers
and relays, as well as the ROM, which contains card ID
and conÞguration information. These various elements
are discussed in the following paragraphs.
Relays
+3.5V (Steady State)
+5.7 (≈ 100 msec during
relay actuation)
Relay
Power
Control
Q100, Q101
U106, U107
User connections
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