Motorola Two Way Portable Radio Ht750 Ht1250 Mtx850 Mtx1250 Mtx8250 Mtx9250 Basic 68p80906z54 D Manual

							HT750 MTX850 MTX8250
HT1250 MTX850•LS MTX8250•LS
HT1250•LS HT1250•LS+ MTX950
HT1550•XLS MTX9250
Portable Radios
Professional Radio
Basic Service Manual
Motorola, Inc.
8000 West Sunrise Boulevard
Fort Lauderdale, Florida 33322
68P80906Z54-D 
						

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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 68P81095C98) 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
List of Figures ...............................................................................................ix
List of Tables .................................................................................................xi
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
Intrinsically Safe Radio Information ......................................................... 2-1
2.1 FMRC Approved Equipment ...............................................................................  2-1
2.2 Repair of FMRC Approved Products ..................................................................  2-2
2.2.1 Repair ......................................................................................................  2-2
2.2.2 Relabeling ................................................................................................  2-2
2.2.3 Do Not Substitute Options or Accessories...............................................  2-3
Chapter 3
Maintenance ............................................................................................... 3-1
3.1 Introduction .........................................................................................................  3-1
3.2 Preventive Maintenance .....................................................................................  3-1
3.2.1 Inspection.................................................................................................  3-1 
						

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3.2.2 Cleaning Procedures ................................................................................ 3-1
3.3 Safe Handling of CMOS and LDMOS Devices ................................................... 3-2
3.4 Repair Procedures and Techniques — General ................................................. 3-2
3.5 Disassembling and Reassembling the Radio — General ................................... 3-3
3.6 Detailed Radio Disassembly ............................................................................... 3-4
3.6.1 Front Cover from Chassis Disassembly ................................................... 3-4
3.6.2 Chassis Assembly/Disassembly............................................................... 3-6
3.6.3 Keypad, Display, and Keypad/PassPort/Option Board Disassembly ....... 3-6
3.6.4 Speaker, Microphone, and Universal Connector Flex Disassembly ........ 3-8
3.6.5 PTT Disassembly ..................................................................................... 3-9
3.6.6 Control Top Disassembly ......................................................................... 3-9
3.7 Detailed Radio Reassembly .............................................................................. 3-10
3.7.1 Control Top Reassembly ........................................................................ 3-10
3.7.2 PTT Reassembly .................................................................................... 3-10
3.7.3 Speaker, Microphone, and Universal Connector Flex Reassembly ....... 3-10
3.7.4 Keypad, Display, and Keypad/PassPort/Option Board Reassembly...... 3-10
3.7.5 Chassis Assembly Reassembly ............................................................. 3-11
3.7.6 Chassis and Front Cover Reassembly ................................................... 3-11
3.7.7 DTMF Retrofit Kit Procedure (Optional Upgrade Procedure)................. 3-12
3.7.8 Option Board Installation ........................................................................ 3-13
3.8  HT750 Radio Exploded Mechanical View and Parts List ................................. 3-15
3.8.1  HT750 Exploded View ........................................................................... 3-15
3.8.2 HT750 Exploded View Parts List ............................................................ 3-16
3.8.3 HT1250 and HT1250•LS Exploded View ............................................... 3-17
3.8.4 HT1250 and HT1250•LS Parts List ........................................................ 3-18
3.8.5 HT1250•LS+ Exploded View .................................................................. 3-19
3.8.6 HT1250•LS+ Exploded View Parts List .................................................. 3-20
3.8.7 MTX850 Exploded View ......................................................................... 3-21
3.8.8 MTX850 Exploded View Parts List ......................................................... 3-22
3.8.9 MTX850•LS Exploded View ................................................................... 3-23
3.8.10 MTX850•LS Exploded View Parts List ................................................... 3-24
3.8.11 MTX8250 Exploded View ....................................................................... 3-25
3.8.12 MTX8250 Exploded View Parts List ....................................................... 3-26
3.8.13 MTX8250•LS Exploded View ................................................................. 3-27
3.8.14 MTX8250•LS Exploded View Parts List ................................................. 3-28
3.8.15 HT1550•XLS Exploded View .................................................................. 3-29 
						

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3.8.16 HT1550•XLS Exploded View Parts List .................................................  3-30
3.8.17 MTX950 Exploded View.........................................................................  3-31
3.8.18 MTX950 Exploded View Parts List.........................................................  3-32
3.8.19 MTX9250 Exploded View.......................................................................  3-33
3.8.20 MTX9250 Exploded View Parts List.......................................................  3-34
3.9 Service Aids ......................................................................................................  3-35
3.10 Test Equipment.................................................................................................  3-36
3.11 Configuring and Wiring the Programming/Test Cable ......................................  3-37
Chapter 4
Transceiver Performance Testing ............................................................ 4-1
4.1 General ...............................................................................................................  4-1
4.2 RF Test Mode .....................................................................................................  4-1
4.3 Test Frequencies for Display and Non-Display Radios ......................................  4-6
4.4 Receiver Performance Tests ..............................................................................  4-7
Chapter 5
Radio Tuning, Programming, Cloning, Lowband Antenna Cutting 
Procedure, PassPort Tone Options, and Diagnostic Functions ............ 5-1
5.1 Introduction .........................................................................................................  5-1
5.2 Global Radio Tuning Setup.................................................................................  5-2
5.2.1 Initial Test Equipment Setup ....................................................................  5-2
5.3 CPS Programming Setup ...................................................................................  5-3
5.4 Cloning (Conventional and LTR) ........................................................................  5-3
5.4.1 Error Codes (Display Radios Only) ..........................................................  5-4
5.5 Cloning (Privacy Plus) ........................................................................................  5-4
5.6 Cloning (PassPort)..............................................................................................  5-5
5.7 Lowband Molded Antenna Cut Chart..................................................................  5-6
5.8 HT1250•LS+ PassPort Tone Options.................................................................  5-7
5.9 HT1250•LS+ Special Diagnostic Functions ........................................................  5-7
Chapter 6
Power Up Self-Test..................................................................................... 6-1
6.1 Error Codes - Conventional and LTR Radios .....................................................  6-1
6.2 Error Codes - Privacy Plus .................................................................................  6-2 
						

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6.3 Error Codes - PassPort ....................................................................................... 6-3
6.4 Operation Display Codes .................................................................................... 6-3
Chapter 7
Accessories ................................................................................................ 7-1
7.1 HT750/HT1250/HT1250•LS/HT1250•LS+/HT1550•XLS/MTX850/MTX950/
MTX850•LS/MTX8250/MTX9250/MTX8250•LS Accessories ............................. 7-1
7.1.1 Antennas .................................................................................................. 7-1
7.1.2 Carrying Accessories ............................................................................... 7-2
7.1.3 Carry Cases ............................................................................................. 7-2
7.1.4 Chargers .................................................................................................. 7-3
7.1.5 Vehicular Accessories .............................................................................. 7-3
7.1.6 Batteries .................................................................................................. 7-3
7.1.7 Adapters ................................................................................................... 7-3
7.1.8 Miscellaneous........................................................................................... 7-3
7.1.9 Service Aids ............................................................................................. 7-4
7.1.10 Audio Accessories  ................................................................................... 7-4
7.1.11 Option Boards* (All option boards below are not compatible with 
HT1550•XLS) ........................................................................................... 7-5
7.1.12 Remote Speaker Microphones ................................................................. 7-5
7.1.13 Manuals ................................................................................................... 7-5
7.1.14 Retrofit Front Cover Kits  .......................................................................... 7-5
Chapter 8
Model Chart and Test Specifications ....................................................... 8-1
8.1 UHF 403–470 MHz (Conventional) ..................................................................... 8-1
8.2 UHF 450–512 MHz (Conventional) ..................................................................... 8-2
8.3 UHF 403–470 MHz (LTR and PassPort)............................................................. 8-3
8.4 UHF 450–512 MHz (LTR and PassPort)............................................................. 8-4
8.5 UHF 403–470 MHz (Conventional/LTR) ............................................................. 8-5
8.6 UHF 450–512 MHz (Conventional/LTR) ............................................................. 8-6
8.7 VHF 136–174 MHz.............................................................................................. 8-7
8.8 VHF 136–174 MHz (Conventional/LTR) ............................................................. 8-8
8.9 VHF, 136–174 MHz (LTR & PassPort)............................................................... 8-9
8.10 LowBand 29.7–42/35–50 MHz .......................................................................... 8-10
8.11 800 MHz (LTR).................................................................................................. 8-11 
						

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8.12 800 MHz (Privacy Plus) ....................................................................................  8-11
8.13 900 MHz (Privacy Plus) ....................................................................................  8-12
8.14 Specifications, HT750 Radio ............................................................................  8-13
8.15 Specifications, HT1250 Radio ..........................................................................  8-15
8.16 Specifications, HT1250•LS
+ Radio ...................................................................  8-17
8.17 Specifications, HT1550•XLS Radio ..................................................................  8-19
8.18 Specifications, MTX850/MTX8250 (800 MHz),
MTX950/MTX9250 (900 MHz) Radios..............................................................  8-21
8.19 Specifications, MTX850•LS and MTX8250•LS (800 MHz) Radios ...................  8-23
Glossary ......................................................................................... Glossary-1 
						

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LIST OF FIGURES
Figure 3-1: Battery Removal .....................................................................................  3-4
Figure 3-2: Knob Removal ........................................................................................  3-4
Figure 3-3: Chassis Removal ...................................................................................  3-5
Figure 3-4: Unlatch Flex Connectors ........................................................................  3-5
Figure 3-5: Remove Main Board from Chassis .........................................................  3-6
Figure 3-6: Remove Retainer....................................................................................  3-7
Figure 3-5: Removing the Keypad Retainer and Other Boards from the Radio........  3-8
Figure 3-6: Removal Speaker-Microphone Assembly..............................................  3-9
Figure 3-7: PTT Removal..........................................................................................  3-9
Figure 3-8: Lock Retainer Catches to the Radio’s Body.........................................  3-11
Figure 3-9: Fastening the Chassis ..........................................................................  3-12
Figure 3-10: Activating the Retrofit ...........................................................................  3-12
Figure 3-11: Changing Keypad/PassPort Board /Option Boards ..............................  3-13
Figure 3-12: HT750 Exploded View ..........................................................................  3-15
Figure 3-22: Programming/Test Cable AARKN4074 ................................................  3-37
Figure 3-23: Pin Configuration of the Cable Side Connector ....................................  3-37
Figure 3-24: Programming/Test Cable Schematic ....................................................  3-38
Figure 4-1: Radio Side Button Location ....................................................................  4-3
Figure 4-2: HT1550•XLS Radio Side Button Location ..............................................  4-3
Figure 4-3: Two-Line Display ....................................................................................  4-4
Figure 4-4: Four-Line Display (HT1550•XLS) ...........................................................  4-4
Figure 5-1: Radio Tuning Test Equipment Setup......................................................  5-2
Figure 5-2: CPS Programming Setup .......................................................................  5-3
Figure 5-3: Radio Side Button Locations ..................................................................  5-4
Figure 5-4: HT1550•XLS Radio Side Button Locations ............................................  5-4 
						

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Notes