Schematic Diagram Hierarchy; Notes On Sheet Port Connections, Circuit Block Port Connections And Physical Connectors - Motorola MCS 2000 Service Instructions Manual

Notes on Sheet Port Connections, Circuit Block Port Connections
and Physical Connectors
On the schematic drawings there are three different signal connection markers as described below.
Sheet Port Connection
The Sheet connection appear as
continues to another schematic page. Typically the arrow direction indicates whether it is an input of output. These
are used because the complete circuit scheme could not fit on one schematic sheet.
Circuit Block Port Connection
Besides the need to show page to page connections, the schematics also indicate interblock connections. While the
radio is fabricated on one or two PCBs, 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 system
creates an imaginary point at which a runner 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
diagram shows many of these blocks which are connected.
Physical Connector
Actual connectors such as the Accessory connector are shown with reference designators Jxxx or Pxxx. These represent
physical connectors.
Schematic Hierarchy
Many of the MCS 2000 schematics 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 sheets in the manual contain blocks or components, or both, in various sheets.
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 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 sheet which they represent.
RF
See Volume:
2a: 800 MHz
2b: VHF
2c: UHF
2d: 900 MHz
Microprocessor
Hear Clear
10-2
or . These markers indicate that the signal shown on a given page
Control Head
(Model I, Model II or Model III)
Main Controller
Audio
ASFIC
I/O and
RSSI Buffer
Figure 10-1 Schematic Diagram Hierarchy
symbol shown. The interconnect
Controller
Regulator and
Audio Power Amplifier
Interface
Emergency
SCI Drivers
Ignition
Power Control
I/O Buffers