Reading Drawings And Parts Lists - Motorola MTR2000 Manual

Introduction

Reading Drawings and Parts Lists

A
Service Notes
6
Where a package covers more than one model, a description of the differences be-
tween the models is provided at the front of the package.
The block diagrams, schematics, and board layout drawings are provided on fold-
out sheets.
Schematics
The schematics are presented for left-to-right signal flow (where practical) and
contain theory notes, waveforms, dc voltages, RF levels, IC data tables, and other
pertinent information to aid the technician in troubleshooting and servicing the
station to the component level. Any components on the schematic which are
marked IGNORE are not placed on the printed circuit board.
Each set of schematics begins with a block diagram followed by detailed schemat-
ics. The block diagram contains interconnected blocks. Each block represents a
functional section of circuitry for which a detailed schematic follows.
Symbols are used to highlight information on the schematics as follows:
This symbol highlights a point at which a voltage level is provided.
The service note symbol indicates that a service note is available for the associated
section of circuitry. The letter within the circle uniquely identifies the service note.
The service notes are provided as a table, in close proximity to the associated sche-
matic.
Service notes, where applicable, provide:
- a brief description of the circuitry operation.
- current level,
- voltage level,
- signal level, and
- pinout tables for custom ICs.
Board Layouts
Each drawing shows the location and reference designation for all electrical com-
ponents. Where applicable, connectors, cables, and other information are shown
as troubleshooting aids.
Parts Lists
A complete list of all parts is provided with the parts ordered according to the
schematic reference number.
68P81096E40-F 7/28/2007