5790B
Service Manual
2-4
Digital Section Overview
The unguarded Digital Section contains the CPU assembly (A20), the Front
Panel assembly (A2), Keyboard assembly (A1), and the Rear Panel I/O
assembly (A21). Figure 2-2 is a block diagram of the digital section of the
Product.
Analog Section Overview
The guarded analog section of the Product contains the following assemblies:
• Filter (A18)
• Regulator/Guard Crossing (A17)
• Transfer (A10)
• A/D Amplifier (A15)
• DAC (A16)
• Wideband (A6)
These analog assemblies are interfaced to the analog motherboard assembly
(A3). The guarded digital bus generated by the guard crossing portion of the
regulator/guard crossing assembly controls all analog assemblies except the
filter. The guard crossing interfaces with the unguarded CPU assembly via a
fiber-optic link. The transformer assembly, together with the filter assembly and
the regulator portion of the regulator/guard crossing assembly, create the system
power supply for all the analog assemblies.
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