Midland Radio 70101BD Users manual
SERVICE MANUAL
RF DATA LINK RADIOS
70-101BD
70-201BD
Important Information
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All rights reserved. No part of this publication may be reproduced,
transmitted, transcribed, stored in a retrieval system, or translated into
any language without the written permission of Midland Radio
Corporation
No part of any copyrighted computer programs contained in the products
referred to in this manual may be copied or reproduced without the
express written consent of Midland Radio Corporation
Midland Radio Corporation reserves the right to change the products
described in this manual without prior notice.
© Midland Radio Corporation
This manual is designed to facilitate the set -up and service of the Midland 70101BD and 70 -201BD RF Data Link Radio series. As necessary, service manual
supplements will be published and distributed on the following forms:
Manual Addition (MA)……………For supplemental information
useful in product service or
improvement. Printed on BLUE
paper.
Change Notice (CN)……………For details about changes made during
production by model and serial number.
Printed on YELLOW paper.
Manual Correction (MC).......For correcting literature errors not
related to production changes.
Printed on GREEN paper.
Technical Bulletin (TB)..........For solutions to field problems and
tips for performance improvement.
Printed on PINK paper.
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Comments or suggestions concerning areas of manual improvement are
welcome.
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TABLE OF CONTENTS
Manual Supplement Information .....................................................................ii
Table of Contents...........................................................................................iii
Acronyms and Abbrevi ations .........................................................................iv
GENERAL INFORMATION
Specifications ...................................................................................................1-3
PREPARATION
Test Equipment ................................................................................................4
Alignment Points...............................................................................................5
Complete Realignment......................................................................................6-7
CIRCUIT DESCRIPTION
Description .......................................................................................................8-11
SERVICE
Maintenance and Repair ..................................................................................12-13
Trouble shooting guide......................................................................................14
Voltage Charts..................................................................................................15-18
Component Pinout ............................................................................................19-22
DIAGRAMS
Block Diagram..................................................................................................23
Wiring Diagram .................................................................................................24
TCXO Schematic ..............................................................................................24
VCO (148 -174MHz) Schematic..........................................................................25
VCO (440 -470MHz) Schematic..........................................................................25
Front End (148-174MHz) Schematic ..................................................................26
Front End (440-470MHz) Schematic ..................................................................26
PA (148 -174MHz) Schematic ............................................................................26
PA (440 -470MHz) Schematic ............................................................................26
RF Board (148 -174MHz) Schematic...................................................................27
RF Board (440 -470MHz) Schematic...................................................................28
Digital Board Schematic....................................................................................29
RF Board View (148 -174MHz) Layout ................................................................30
RF Board View (440 -470MHz) Layout ................................................................31
Digital Board View Layout .................................................................................32
70-101/201BD Exploded View...........................................................................33
PARTS
70-101BD RF Board Parts List...........................................................................35-38
70-201BD RF Board Parts List...........................................................................39-42
Digital Board Parts List......................................................................................43-45
Replacement Parts Ordering .............................................................................46
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