Chapter 10 Diagrams And Parts Lists; Notes On Sheet Port Connections, Circuit Block Port Connections And Physical Connectors; Sheet Port Connection; Circuit Block Port Connection - Motorola MCS 2000 Service Instructions Manual

Diagrams and Parts Lists: Notes on Sheet Port Connections, Circuit Block Port Connections and Physical Connectors

Chapter 10 Diagrams and Parts Lists

Notes on Sheet Port Connections, Circuit Block Port Connections and
Physical Connectors
On the schematic diagrams, there are three different signal connection markers as described below.

Sheet Port Connection

The Sheet connection appear as
one sheetcontinues to another sheet. Typically the arrow direction indicates whether it is an input of
output. These markets are used because the complete circuit scheme cannot fit on one schematic
diagram sheet.

Circuit Block Port Connection

Besides the need to show sheet to sheet connections, the schematic diagrams also indicate
interblock connections. While the radio is fabricated on one or two Printed Circuit Boards, it is
actually composed of several functional circuit blocks, which are interconnected. For example some
signals from the receive front end block are connected to the Synthesizer circuit block. While there is
no connector, and these two blocks are connected only by copper traces, the schematic diagram
design system creates an imaginary point, at which runners for a given signal from the two blocks
meet, and assigns a connection number. This number typically appears on the schematic as IF####
with a

Physical Connector

Actual connectors such as the Accessory connector are shown with reference designators Jxxx or
Pxxx. These represent physical connectors.

Schematic Diagram Hierarchy

Many of the MCS 2000 schematic diagrams are created in a hierarchical fashion. This is similar to a
computer directory/subdirectory format. Like in a computer where there can be a mix of files and
subdirectories under a given directory, some schematic diagram sheets in the manual contain blocks
or components, or both.
Pages that follow contain the component level breakdown of the blocks. Components refer to
discrete electrical elements like resistors and capacitors. Blocks refer to a logical grouping of
schematic components which appear in detail on following schematic diagram sheets. This
representation allows the reader to start with an overview of the schematic/circuit topology and
navigate into more and more component level detail. Schematic blocks are represented by
rectangular blocks shown by dashed outlines and contain the title of the schematic diagram sheet
which they represent.
68P81083C20-D
symbol shown.
or . These markers indicate that a signal shown on
December 6, 2004