Figure 2-10.—ExampIe of a modular-designed frame computer.
The chassis- or assembly-designed computer
contains the following:
Chassis or assemblies
Chassis or assembly mounting and retaining
hardware
Chassis or assembly electrical connector
receptacles and interconnecting wiring harness
External connections for data and power cables
Printed circuit boards (pcb’s)
An operator’s control or maintenance panel
A blower unit with air filter and heat exchanger,
which allows cooling air to circulate through all
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the chassis or assemblies inside the frame or
cabinet
Gaskets for electronic shielding, moisture
protection, air ducting, and electrical connectors
Filter unit for electronic shielding
Test blocks for maintenance
Time meter to monitor powered-on time
Chassis or assemblies use the same basic concept
as modules except they are not readily removable and
usually contain more than one functional area of the
computer. The functional areas are usually grouped
together in blocks of two or more pcb’s. The
subassemblies or pcb’s that make up a functional area
are grouped together in a chassis or assembly rather than
