Motorola Gm300 Basic 68p64115b51 Manual

							Professional Radio
GM300 Series
Basic Service Manual
68P64115B51
Issue: July 2000 
						

							ii
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 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 or reproduced 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
royalty-free license to use that arises by operation of law in the sale of a product. 
						

							iii
SAFETY INFORMATION
Read this information before using your radio.
SAFE AND EFFICIENT OPERATION OF MOTOROLA TWO-WAY RADIOS
This document provides information and instructions for the safe and efficient operation of Motorola
Portable and Mobile Two-Way Radios. The information provided in this document supersedes the
general safety information contained in user guides published prior to 1 January 1998.
For information regarding radio use in hazardous areas, please refer to the Factory Mutual (FM)
approval manual supplement.
EXPOSURE TO RADIO FREQUENCY ENERGY
Your Motorola Two-Way Radio, which generates and radiates radio frequency (RF) electromagnetic
energy (EME), is designed to comply with the following National and International Standards and
Guidelines regarding exposure of human beings to radio frequency electromagnetic energy:

Federal Communications Commission Report and Order No. FCC 96-326 (August 1996)

American National Standards Institute (C95.1 - 1992)

National Council on Radiation Protection and Measurements (NCRP-1986)

International Commission on Non-Ionizing Radiation Protection (ICNRP- 1986)

European Committee for Electrotechnical Standardization (CENELEC):
To assure optimal radio performance and to ensure that your exposure to radio frequency
electromagnetic energy is within the guidelines in the above standards, always adhere to the following
procedures:
ELECTROMAGNETIC INTERFERENCE/COMPATIBILITY

To avoid electromagnetic interference and/or compatibility conflicts, turn off your radio in any facility
where posted notices instruct you to do so. Hospital or health facilities may be using equipment that
is sensitive to external RF energy.

When instructed to do so, turn off your radio when on board an aircraft. Any use of a radio must be
in accordance with airline regulations or crew instructions.
Mobile Radio Operation and EME Exposure
To assure optimal radio performance and that human exposure to radio frequency electromagnetic
energy is within the guidelines referenced in this document, transmitonlywhen people inside and
outside the vehicle are at least the minimum distance away from a properly installed,
externally-mounted antenna.ENV 50166-1 1995 E Human exposure to electromagnetic fields Low
frequency (0 Hz to 10 kHz)
- ENV 50166-2 1995 E Human exposure to electromagnetic fields High
frequency (10 kHz to 300 GHz)
- Proceedings of SC211/B
1996“Safety Considerations for Human Exposure to
EMFs from Mobile Telecommunication Equipment
(MTE) in the Frequency Range 30MHz - 6 GHz.”
(EMF - Electro-Magnetic Fields)
NOTENearly every electronic device is susceptible to electromagnetic interference (EMI) if
inadequately shielded, designed, or alternately configured for electromagnetic compatibility. 
						

							iv
The table below lists the minimum distance for several different ranges of rated radio power.
Mobile Antenna Installation
Install the vehicle antennaexter nalto the vehicle and in accordance with:
a. The requirements of the antenna manufacturer/supplier
b. Instructions in the radio installation manual.
Control Station Operation
When radio equipment is used to operate as a control station, it is important that the antenna be
installed outside the building and away from places where people may be in close proximity.
OPERATIONAL WARNINGS
Potentially explosive atmospheres
Blasting caps and areasTable 1 Rated Power and Distance
Rated Power of Vehicle-Installed
Mobile Two-Way RadioMinimum Distance from
Transmitting Antenna
7to15Watts30.5 cm (1 Foot)
16 to 50 Watts 61 cm (2 Feet)
More than 50 Watts91.5 cm (3 Feet)
NOTERefer to Table 1 for rated power and minimum distance values for transmitting
antennas.
WARNING: Turn off your Two-Way radio when you are in any area with a potentially explosive
atmosphere, unless it is a radio type especially qualified for use in such areas. Sparks in a
potentially explosive atmosphere can cause an explosion or fire resulting in bodily injury or
even death.
WARNING: To avoid possible interference with blasting operations, turn off your radio when
you are near electrical blasting caps. In a “blasting area” or in areas posted “turn off two-
way radio”, obey all signs and instructions.
NOTEThe areas with potentially explosive atmospheres referred to above include fuelling areas
such as: below decks on boats; fuel or chemical transfer or storage facilities; areas where
the air contains chemicals or particles, such as grain, dust or metal powders; and any other
area where you would normally be advised to turn off your vehicle engine. Areas with
potentially explosive atmospheres are often but not always posted.
!
! 
						

							v
Ta b l e o f C o n t e n t s
SAFETY INFORMATION ........................................................................................iii
Chapter 1 INTRODUCTION
1.0 Scope of Manual .................................................................................................. 1-1
2.0 Warranty and Service Support ............................................................................. 1-1
2.1 Warranty Period and Return Instructions ....................................................... 1-1
2.2 After Warranty Period ..................................................................................... 1-1
2.3 European Radio Support Centre (ERSC) ....................................................... 1-2
2.4 Piece Parts ..................................................................................................... 1-2
2.5 Technical Support........................................................................................... 1-3
3.0 Radio Model Information ...................................................................................... 1-4
Chapter 2 MODEL CHART AND TEST SPECIFICATION
1.0 Model Chart (UHF 403-470 MHz) ........................................................................ 2-1
2.0 Model Chart (VHF 136-174 MHz) ........................................................................ 2-2
3.0 Model Chart (Low Band 29-50 MHz) ................................................................... 2-3
2.4 Specifications ...................................................................................................... 2-4
Chapter 3 MAINTENANCE
1.0 Introduction .......................................................................................................... 3-1
2.0 Preventive Maintenance ...................................................................................... 3-1
2.1 Inspection ....................................................................................................... 3-1
2.2 Cleaning Procedures ...................................................................................... 3-1
3.0 Safe Handling of CMOS and LDMOS Devices .................................................... 3-2
4.0 Repair Procedures and Techniques — General .................................................. 3-3
5.0 Disassembling and Reassembling the Radio — General .................................... 3-3
6.0 Radio Disassembly - Detailed .............................................................................. 3-4
6.1 Control Head Removal ................................................................................... 3-4
6.2 Top Cover Removal........................................................................................ 3-5
6.3 Transceiver Board Removal ........................................................................... 3-6
6.4 Disassembly of Control Head - GM340 (without display) ............................... 3-7
6.5 Disassembly of Control Heads - GM360 and GM380 (with display) .............. 3-8
7.0 Radio Assembly ................................................................................................... 3-9
7.1 Control Head - GM340 ................................................................................... 3-9
7.2 Control Heads - GM360 and GM380 .............................................................. 3-9
7.3 Radio Chassis and Transceiver Board ......................................................... 3-10
7.4 Control Head Fitting...................................................................................... 3-10 
						

							vi
8.0 Radio Exploded Mechanical Views and Parts Lists ........................................... 3-11
8.1 Radio Assembly - 25W Models .................................................................... 3-11
8.2 Radio Assembly - 60W Models .................................................................... 3-12
8.3 Control Head - GM340 ................................................................................. 3-13
8.4 Control Head - GM360 ................................................................................. 3-14
8.5 Control Head - GM380 ................................................................................. 3-15
9.0 Service Aids ....................................................................................................... 3-16
10.0 Test Equipment.................................................................................................. 3-17
11.0 Programming/Test Cable - RKN4083_ .............................................................. 3-18
Chapter 4 TRANSCEIVER PERFORMANCE TESTING
1.0 General ................................................................................................................ 4-1
2.0 Setup ................................................................................................................... 4-1
3.0 RF Test Mode ...................................................................................................... 4-2
Chapter 5 RADIO TUNING AND PROGRAMMING
1.0 Introduction .......................................................................................................... 5-1
2.0 CPS Programming Setup .................................................................................... 5-1
3.0 Radio Tuning Setup ............................................................................................. 5-3
3.1 Initial Test Equipment Control Settings .......................................................... 5-3
Chapter 6 POWER UP SELF-TEST
1.0 Error Codes ......................................................................................................... 6-1 
						

							Chapter 1
INTRODUCTION
1.0 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 and is current as of the printing
date. Changes which occur after the printing date may be incorporated by a complete Manual
revision or alternatively as additions.
2.0 Warranty and Service Support
Motorola offers long term support for its products. This support 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 by an authorised Motorola Dealer must be
accompanied by a Warranty Claim Form. Warranty Claim Forms are obtained by contacting an
Authorised Motorola Dealer.
2.1 Warranty Period and Return Instructions
The terms and conditions of warranty are defined fully in the Motorola Dealer or Distributor or
Reseller contract. These conditions may change from time to time and the following notes 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 (Please see page 2 and page 3 in this Chapter). All returns must be
accompanied by a Warranty Claim Form, available from your Customer Services representative.
Products should be shipped back in the original packaging, or correctly packaged to ensure no
damage occurs in transit.
2.2 After Warranty Period
After the Warranty period, Motorola continues to support its products in two ways.
1.Motorolas Radio Aftermarket and Accessory Division (AAD) offers a repair service to both
end users and dealers at competitive prices.
2.AAD supplies individual parts and modules that can be purchased by dealers who are
technically capable of performing fault analysis and repair.
NOTEBefore operating or testing these units, please read the Safety Information Section in the
front of this manual. 
						

							1-2INTRODUCTION
2.3 European Radio Support Centre (ERSC)
The ERSC Customer Information Desk is available through the following service numbers:
Austria: 06 60 75 41 Italy: 16 78 77 387
Belgium: 08 00 72 471 Luxemburg: 08 00 23 27
Denmark: 80 01 55 72 Netherlands: 60 22 45 13
Finland: 08 00 11 49 10 Norway: 80 01 11 15
France: 05 90 30 90 Portugal: 05 05 49 35 70
Germany: 01 30 18 75 24 Spain: 90 09 84 902
Greece: 00 80 04 91 29 020 Sweden: 02 07 94 307
UK: 0800969095 Switzerland: 1553082
Ireland: 18 00 55 50 21 Iceland: 80 08 147
Or dial Customer Care Centre:
Tel: +49 6128 70 2164
Please use these numbers for repair enquiries only.
2.4 Piece Parts
Some replacement parts, spare parts, and/or product information can be ordered directly. If a
complete Motorola part number is assigned to the part, it is available from Motorola Radio
Aftermarket and Accessory Division (AAD). If no part number is assigned, the part is not normally
available from Motorola. If the par t number is appended with an asterisk, the par t is serviceable by
Motorola Depot only. If a parts list is not included, this generally means that no user-serviceable
parts are available for that kit or assembly.
All part orders should be directed to :
Motorola GmbH
European Parts Department
65232 Taunusstein
Germany. 
						

							Warranty and Service Support1-3
2.5 Technical Support
Motorola Product Services is available to assist the dealer/distributors in resolving any malfunctions
which may be encountered.
UK/Ireland- Richard Russell
Telephone: +44 (0) 1256 488 082
Fax: +44 01256 488 080
Email: [email protected]
Central/East Europe- Siggy Punzenberger
Telephone: +49 (0) 6128 70 2342
Fax: +49 (0) 6128 95 1096
Email: [email protected]
Northern Europe-BjornRambert
Telephone: +46 8 735 9282
Fax: +46 8 735 9280
Email: [email protected]
Germany
Telephone: +49 (0) 6128 70 2266
Fax: +49 (0) 6128 95 1685
Email: [email protected]
France -Lionel Lhermitte
Telephone: +33 1 6929 5722
Fax: +33169295904
Email: [email protected]
Italy -Ugo Gentile
Telephone: +39 0 2822 0325
Fax: +39028220334
Email: [email protected]
Africa & Middle East -Ralph Schubert
Telephone: +33 (0)4 4230 5887
Fax: +33 (0)4 4230 4784
Email: [email protected] 
						

							1-4INTRODUCTION
3.0 Radio Model Information
The model number and serial number are located on a label attached to the back of your radio. You
can determine the RF output power, frequency band, protocols, and physical packages. The
example below shows one portable radio model number and its specific characteristics.
Ta b l e 1 - 1Radio Model Number (Example: MDM25KHC9AN1AE)
Type of
UnitModel
SeriesFreq.
BandPower
LevelPhysical
PackagesChannel
SpacingProtocolFeature
LevelModel
RevisionModel
Package
MD M 25 K
VHF
(136-
174MHz)H
1-25WC
GM140
GM340
GM6409
Program-
mableAA
Conventional
MDC1
GM140
GM340
GM640AE
R
UHF1
(403-
470MHz)K
40-60WF
GM160
GM360
GM660AN
5 Tone5
GM160
GM360
GM660.
B
LB1
(29.7-
36.0MHz)N
GM380
GM1280CK
MPT8
GM380
GM1280
C
LB2
(36.0-
42.0MHz)
D
LB3
(42.0-50.0
MHz)
MD= Motorola Internal Use
M= Mobile