Motorola Cdm Series Basic 6881091c62 D Manual

							CDM Series™
Professional Series
Two-Way Mobile Radio
Basic Service Manual 
						

							 CDM Series™
Professional Series
Two-Way Mobile Radio
Basic Service Manual
Motorola, Inc.
8000 West Sunrise Boulevard
Fort Lauderdale, Florida 33322
6881091C62-D 
						

							ii
Foreword
This manual provides sufficient information to enable qualified service technicians to troubleshoot and repair 
CDM Series mobile radios to the component level.
Product Safety and RF Exposure Compliance
ATTENTION!
This radio is restricted to occupational use only to satisfy FCC RF energy exposure requirements. 
Before using this product, read the RF energy awareness information and operating instructions in 
the Product Safety and RF Exposure booklet (Motorola Publication part number 6881095C99) to 
ensure compliance with RF energy exposure limits.
For a list of Motorola-approved antennas, batteries, and other accessories, visit the following web site 
which lists approved accessories: http://www.motorola.com/cgiss/index.shtml.
Computer Software Copyrights
The Motorola products described in this manual may include copyrighted Motorola computer programs stored 
in semiconductor memories or other media. Laws in the United States and other countries preserve for 
Motorola certain exclusive rights for copyrighted computer programs, including, but not limited to, the 
exclusive right to copy or reproduce in any form the copyrighted computer program. Accordingly, any 
copyrighted Motorola computer programs contained in the Motorola products described in this manual may 
not be copied, reproduced, modified, reverse-engineered, or distributed in any manner without the express 
written permission of Motorola. Furthermore, the purchase of Motorola products shall not be deemed to grant 
either directly or by implication, estoppel, or otherwise, any license under the copyrights, patents or patent 
applications of Motorola, except for the normal non-exclusive license to use that arises by operation of law in 
the sale of a product.
Document Copyrights
No duplication or distribution of this document or any portion thereof shall take place without the express 
written permission of Motorola. No part of this manual may be reproduced, distributed, or transmitted in any 
form or by any means, electronic or mechanical, for any purpose without the express written permission of 
Motorola.
Disclaimer
The information in this document is carefully examined, and is believed to be entirely reliable. However, no 
responsibility is assumed for inaccuracies. Furthermore, Motorola reserves the right to make changes to any 
products herein to improve readability, function, or design. Motorola does not assume any liability arising out 
of the applications or use of any product or circuit described herein; nor does it cover any license under its 
patent rights nor the rights of others.
Trademarks
MOTOROLA and the Stylized M logo are registered in the US Patent & Trademark Office. All other products 
or service names are the property of their respective owners.
© Motorola, Inc. 2002.Before using this product, read the operating instructions 
for safe usage contained in the Product Safety and RF 
Exposure booklet.
!
C a u t i o n 
						

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Table of Contents
Foreword .........................................................................................................ii
Product Safety and RF Exposure Compliance ............................................................... ii
Computer Software Copyrights....................................................................................... ii
Document Copyrights ..................................................................................................... ii
Disclaimer ....................................................................................................................... ii
Trademarks..................................................................................................................... ii
Chapter 1
Introduction ................................................................................................ 1-1
1.1 Scope of Manual .................................................................................................  1-1
1.2 Warranty and Service Support............................................................................  1-1
1.2.1 Warranty Period and Return Instructions .................................................. 1-1
1.2.2 After Warranty Period ............................................................................... 1-1
1.2.3 Piece Parts Availability.............................................................................. 1-2
1.2.4 Technical Support ..................................................................................... 1-3
1.3 Radio Model Information.....................................................................................  1-4
Chapter 2
Maintenance ............................................................................................... 2-1
2.1 Introduction .........................................................................................................  2-1
2.2 Preventive Maintenance .....................................................................................  2-1
2.2.1 Inspection.................................................................................................. 2-1
2.2.2 Cleaning Procedures ................................................................................ 2-1
2.3 Safe Handling of CMOS and LDMOS Devices ...................................................  2-2
2.4 Repair Procedures and Techniques — General .................................................  2-2
2.5 Disassembling and Reassembling the Radio — General ...................................  2-3
2.6 Radio Disassembly — Detailed ..........................................................................  2-3
2.6.1 Control Head Removal.............................................................................. 2-3
2.6.2 Top Cover Removal .................................................................................. 2-4
2.6.3 Transceiver Board Removal ..................................................................... 2-5
2.6.3.1 LowBand Transceiver Board Removal ............................................... 2-6
2.6.3.2. Removing and Replacing Defective LDMOS Devices (Q1402 and 
Q1403) .............................................................................................. 2-6
2.6.4 CDM750 Control Head Disassembly ........................................................ 2-7 
						

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2.6.5 CDM1250, CDM1550, CDM1550•LS, and CDM1550•LS+ Control Head 
Disassembly ..............................................................................................2-9
2.7 Radio Assembly ................................................................................................ 2-10
2.7.1 CDM750 Control Head ............................................................................2-10
2.7.2 CDM1250, CDM1550, CDM1550•LS, and CDM1550•LS+ 
Control Heads .........................................................................................2-10
2.7.3 Radio Chassis and Transceiver Board ....................................................2-10
2.7.3.1 LowBand Radio Chassis and Transceiver Board Assembly .............2-11
2.7.4 Control Head Fitting ................................................................................2-12
2.8 Radio Assembly Exploded Mechanical View and Parts List ............................. 2-13
2.9 CDM750 Radio Control Head Exploded Mechanical View and Parts List ........ 2-14
2.10 CDM1250 Radio Control Head Exploded Mechanical View and Parts List ...... 2-15
2.11 CDM1550 Radio Control Head Exploded Mechanical View and Parts List ...... 2-16
2.12 CDM1550•LS and CDM1550•LS+ Radio Control Head Exploded Mechanical View 
and Parts List .................................................................................................... 2-17
2.13 Service Aids ...................................................................................................... 2-19
2.14 Test Equipment ................................................................................................. 2-20
2.15 Programming Test Cable Configuring and Wiring............................................. 2-21
Chapter 3
Transceiver Performance Testing ............................................................ 3-1
3.1 General ............................................................................................................... 3-1
3.2 Setup ................................................................................................................... 3-1
3.3 RF Test Mode ..................................................................................................... 3-2
Chapter 4
Radio Programming and Tuning Procedures .......................................... 4-1
4.1 Introduction ......................................................................................................... 4-1
4.2 CPS Programming Setup .................................................................................... 4-1
4.3 Radio Tuning Setup ............................................................................................ 4-3
4.3.1 Initial Test Equipment Control Settings .....................................................4-3
4.4 Transmitter Tuning .............................................................................................. 4-4
4.4.1 Power Amplifier (PA) Bias Tuning .............................................................4-4
4.4.2 Reference Oscillator Warp ........................................................................4-5
4.4.3 DAC Tuning (LowBand radios only) ..........................................................4-6
4.4.4 Transmit Power Tuning .............................................................................4-7 
						

							v
4.4.5 Power Amplifier (PA) Voltage Limit Tuning (VHF 1-25W and UHF 1-25W 
LDMOS radios only).................................................................................. 4-7
4.4.6 Modulation Balance Attenuation ............................................................... 4-8
4.4.7 VCO Attenuation ....................................................................................... 4-9
4.4.8 VCO Attenuation (25 kHz) ........................................................................ 4-9
4.4.9 VCO Attenuation (20 kHz) ...................................................................... 4-10
4.4.10 VCO Attenuation (12.5 kHz)................................................................... 4-10
4.4.11 DTMF Deviation Tuning .......................................................................... 4-11
4.4.12 MDC1200 Deviation Tuning (MDC radios only) ...................................... 4-11
4.5 Receiver Tuning................................................................................................  4-11
4.5.1 Front End Filter Tuning ........................................................................... 4-12
4.5.2 Rated Volume Tuning ............................................................................. 4-15
4.5.3 Squelch Tuning ....................................................................................... 4-16
Chapter 5
Power Up Self-Test..................................................................................... 5-1
5.1 Error Codes - Conventional Radios ....................................................................  5-1
5.2 CDM1550•LS+ PassPort Tone Options..............................................................  5-2
5.3 CDM1550•LS+ Special Diagnostic Functions.....................................................  5-3
5.4 CPS/PPCPS Programming Setup ....................................................................... 5-4
Chapter 6
Accessories ................................................................................................ 6-1
6.1 Accessories ........................................................................................................  6-1
6.1.1 Antennas ................................................................................................... 6-1
6.1.2 Mounting ................................................................................................... 6-2
6.1.3 Remote Mount .......................................................................................... 6-2
6.1.4 Loudspeaker ............................................................................................. 6-2
6.1.5 Audio ......................................................................................................... 6-2
6.1.6 Hands Free Operation .............................................................................. 6-3
6.1.7 Base Control ............................................................................................. 6-3
6.1.8 Desktop ..................................................................................................... 6-4
6.1.9 Installation ................................................................................................. 6-4
6.1.10 Option Boards ........................................................................................... 6-4
6.1.11 Buttons ...................................................................................................... 6-4
6.2 Error Codes - PassPort.......................................................................................  6-7 
						

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Chapter 7
Model Chart and Test Specifications ....................................................... 7-1
7.1 UHF 403-470 MHz (Conventional) ...................................................................... 7-1
7.2 UHF 450-512 MHz (Conventional) ...................................................................... 7-2
7.3 UHF 403-470 MHz (Conventional, LTR) ............................................................. 7-3
7.4 UHF 450-512 MHz (Conventional, LTR) ............................................................. 7-3
7.5 UHF 403-470 MHz (Conventional, LTR/PassPort) ............................................. 7-4
7.6 UHF 450-512 MHz (Conventional, LTR/PassPort) ............................................. 7-5
7.7 LowBand 29.7-36 MHz........................................................................................ 7-6
7.8 LowBand 36-42 MHz........................................................................................... 7-6
7.9 LowBand 42-50 MHz........................................................................................... 7-7
7.10 VHF 136-174 MHz .............................................................................................. 7-8
7.11 VHF 136-174 MHz (LTR and PassPort).............................................................. 7-9
7.12 Specifications ................................................................................................... 7-10
Glossary ......................................................................................... Glossary-1 
						

							1-1
Chapter 1
Introduction
1.1 Scope of Manual
This manual is intended for use by service technicians familiar with similar types of equipment. It 
contains service information required for the equipment described in this document and is current as 
of the printing date. Changes which occur after the printing date will be incorporated in a complete 
Manual Revision or alternatively as additions.
1.2 Warranty and Service Support
Motorola offers support which includes: full exchange and/or repair of the product during the warranty 
period; and service/repair or spare parts support out of warranty. Any “return for exchange” or “return 
for repair” to an authorized Motorola Dealer must be accompanied by a Warranty Claim Form. 
Warranty Claim Forms are available from Authorized Motorola Dealers.
1.2.1 Warranty Period and Return Instructions
The terms and conditions of warranty are defined fully in the Motorola Dealer, Distributor or Reseller 
contract. These conditions may change from time to time, and the following subsections are for 
guidance purposes only.
In instances where the product is covered under a “return for replacement” or “return for repair” 
warranty, a check of the product should be performed prior to shipping the unit back to Motorola. This 
is to ensure that the product has been correctly programmed or has not been subjected to damage 
outside the terms of the warranty.
Prior to shipping any radio back to the appropriate Motorola warranty depot, please contact Customer 
Resources. (See section 1.2.4 on page 1-3 of this chapter.) All returns must be accompanied by a 
Warranty Claim Form available from your Customer Resources representative. Products should be 
shipped back in the original packaging, or correctly packaged to ensure that no damage occurs in 
transit. 
1.2.2 After Warranty Period
After the Warranty period, Motorola continues to support its products in two ways: 
1. Motorolas Radio Parts and Service Group offers repair service to users and dealers at 
competitive prices. 
2. The Motorola Customer Care and Services Division (CCSD) supplies individual parts and mod-
ules that can be purchased by dealers who are capable of performing fault analysis and repair. 
						

							1-2Introduction
1.2.3 Piece Parts Availability
Some replacement parts, spare parts, and/or product information can be ordered directly.
Motorola Online:
Motorola Online users can access our online catalog at
https://www.motorola.com/businessonline
To register for online access, please call 800-814-0601.
Mail Orders:
Send written orders to the following addresses:
Telephone Orders
Customer Care and Services Division*
7:00 AM to 7:00 PM (Central Standard Time)
Monday through Friday (Chicago, U.S.A.)
1-800-422-4210
1-847-538-8023 (International Orders)
U.S. Federal Government Markets Division (USFGMD)
1-800-826-1913 Federal Government Parts - Credit Cards Only
8:30 AM to 5:00 PM (Eastern Standard Time)If... It Means That...
A complete Motorola part number is 
assigned to the part, and it is not identified 
as Depot ONLYThe part is available from the Customer Care 
and Services Division.*
No part number is assigned The part is not normally available from 
Motorola.
The part number is appended with an 
asteriskThe part is serviceable by a Motorola Depot 
only.
A parts list is not included Generally, no user-serviceable parts are 
available for that kit or assembly.
*The Customer Care and Services Division 
(CCSD) was formerly known as the Accesso-
ries and Aftermarket Division (AAD).
Replacement Parts/
Test Equipment/Manuals/
Crystal Service Items:
Motorola Inc.
Customer Care and Services 
Division*
(United States and Canada)
Attention: Order Processing
1307 E. Algonquin Road
Schaumburg, IL 60196Federal Government Orders:
Motorola Inc.
U.S. Federal Government 
Markets Division
Attention: Order Processing
7230 Parkway Drive
Landover, MD 21076International Orders:
Motorola Inc.
Customer Care and Services 
Division*
(United States and Canada)
Attention: Order Processing
1307 E. Algonquin Road
Schaumburg, IL 60196