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SERVICE INFORMATION
4.6 PRINCIPLES
OF OPERATION
4.6.1 Block Diagram
The following
paragraphs discuss the basic operating prin-
Figure 4-9 shows a simplified
block diagram of the Model
ciples for the Model 7072. A schematic diagram of the
7072. Key elements include the buffer (U46), ID data cir-
matrix card may be found in drawing
number
7072-106
cuits (U14, U27, and U47), relay drivers (U30-U45) and
(four sheets), located at the end of Section 5.
relays (Kl-KIB),
and power-on safe guard (U29). The ma-
jor elements are discussed below.
-
Address
Counter
u14
ROM
P%&3l
AO-All
DO-D7
to Serial
CCXWWter
u27
u47
Suffer
(
IDDATA
Relay
Relays
TO
CLK _ >
Drivers
Mainframe
RELAYDATA
>
Kl -K128
Power-On
Safeguard
u29
Output
Enable
Figure
4-9. Model 7072 Block Diagram
4-12
I
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