Motorola GM140, GM160, GM340, GM360, GM380 service maintainability

Professional Radio

GM Series

Service Maintainability

Issue: September 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.

Table of Contents

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

2.6 Related Documents........................................................................................1-3

3.0 Radio Model Information......................................................................................1-4

Chapter 2 MAINTENANCE

1.0 Introduction..........................................................................................................2-1

2.0 Preventive Maintenance ......................................................................................2-1

2.1 Inspection.......................................................................................................2-1

2.2 Cleaning .........................................................................................................2-1

3.0 Safe Handling of CMOS and LDMOS..................................................................2-2

4.0 General Repair Procedures and Techniques.......................................................2-2

5.0 Notes For All Schematics and Circuit Boards......................................................2-5

iii

Chapter 3 SERVICE AIDS

1.0 Recommended Test Tools...................................................................................3-1

2.0 Test Equipment....................................................................................................3-2

iv

SAFETY AND GENERAL INFORMATION

Read this information before using your radio.

IMPORTANT INFORMATION ON SAFE AND EFFICIENT OPERATION

The information provided in this document supersedes the general safety information contained in user guides
published prior to July 2000. For information regarding radio use in a hazardous atmosphere please refer to the
Factory Mutual (FM) Approval Manual Supplement or Instruction Card, which is included with radio models that
offer this capability.

RF Operational Characteristics

Your radio/radio product contains a transmitter and a receiver. When it is ON, it receives and transmits radio
frequency(RF) energy.

Exposure To Radio Frequency Energy

Your Motorola radio/radio product is designed to comply with the following national and international standards
and guidelines regarding exposure of human beings to radio frequency electromagnetic energy:

● United States Federal Communications Commission, Code of Federal Regulations; 47 CFR part 2 sub-part J

● American National Standards Institute (ANSI) / Institute of Electrical and Electronic Engineers (IEEE) C95.

1-1992

● Institute of Electrical and Electronic Engineers (IEEE) C95.1-1999 Edition

● National Council on Radiation Protection and Measurements (NCRP) of the United States, Report 86, 1986

● International Commission on Non-Ionizing Radiation Protection (ICNIRP) 1998

● National Radiological Protection Board of the United Kingdom 1995

● Ministry of Health (Canada) Safety Code 6. Limits of Human Exposure to Radiofrequency Electromagnetic

Fields in the Frequency Range from 3 kHz to 300 GHz, 1999

● Australian Communications Authority Radiocommunications (Electromagnetic Radiation - Human Exposure)

Standard 1999 (applicable to wireless phones only)

To assure optimal radio/radio product performance and make sure human exposure to radio frequency
electromagnetic energy is within the guidelines set forth in the above standards, always adhere to the following
procedures:

v

ELECTROMAGNETIC INTERFERENCE/COMPATIBILITY

NOTE

Facilities

Medical Devices

Pacemakers

Hearing Aids

Nearly every electronic device is susceptible to electromagnetic interference (EMI) if
inadequately shielded, designed, or alternately configured for electromagnetic compatibility.

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

The Health Industry Manufacturers Association recommends that a minimum separation of 15 cms be
maintained between a handheld wireless radio product and a pacemaker .These recommendations are consistent
with the independent research by, and recommendations of, Wireless Technology Research.

Persons with pacemakers should:

● ALWAYS k eep the r adio product more than 15 cms from their pacemak er when the r adio product is turned ON.

● not carry the radio product in the breast pocket.

● use the ear opposite the pacemaker to minimize the potential for interference.

● turn the radio product OFF immediately if you have any reason to suspect that interference is taking place.

Some digital wireless radio products may interfere with some hearing aids. In the event of such interference, you
may want to consult your hearing aid manufacturer to discuss alternatives.

vi SAFETY AND GENERAL INFORMATION

Other Medical Devices

If you use any other personal medical device, consult the manufacturer of your device to determine if it is
adequately shielded from RF energy. Your physician may be able to assist you in obtaining this information.

Safety and General

Use While Driving

Check the laws and regulations on the use of radio products in the area where you drive. Always obey them.
When using your radio product while driving, please:

● Give full attention to driving and to the road.

● Use hands-free operation, if available.

● Pull off the road and park before making or answering a call if driving conditions so require.

OPERATIONAL WARNINGS

Vehicles with an air bag

WARNING: Do not place a radio product in the area over an air bag or in the air bag
deployment area. Air bags inflate with great force. If a radio product is placed in the air bag

!

deployment area and the air bag inflates, the radio product ma y be pr opelled with great for ce
and cause serious injury to occupants of vehicle.

Potentially explosive atmospheres

WARNING: Turn off your radio product prior to entering an y area with a potentiall y explosive
atmosphere, unless it is a radio product type especially qualified for use in such areas as

!

"Intrinsically Safe" (for example, Factory Mutual, CSA, or UL Approved). Do not remove,
install, or charge batteries in such areas. Sparks in a potentially explosive atmosphere can
cause an explosion or fire resulting in bodily injury or even death.

Blasting caps and areas

WARNING: To avoid possible interference with b lasting operations, turn off your radio when
you are near electrical blasting caps, in a “

!

“

turn off two-way radio

NOTE

The areas with potentially explosive atmospheres referred to above include fueling areas
such as below decks on boats, fuel or chemical transf er 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 ad vised to turn off y our vehicle engine. Areas with poten­tially explosive atmospheres are often but not always posted.

blasting area

”. Obey all signs and instructions.

” or in areas posted

SAFETY AND GENERAL INFORMATION vii

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 earlier in this document, transmit only when people outside the vehicle are at
least the minimum distance away from a properly installed, externally-mounted antenna. Table 1 lists the
minimum distance for several different ranges of rated radio power.

Table 1 Rated Power and Distance

ANTENNA INSTALLATION

Mobile Antennas

Recommended mobile antenna installations are limited to metal body vehicles at the center of the roof and center
of the trunk deck locations.

The antenna installation must additionally be in accordance with:

1. The requirements of the antenna manufacturer/supplier.

2. Instructions in the Radio Installation Manual.

Fixed Site Antennas

Mobile radio equipment is sometimes installed at a fixed location and operated as a control station or as a fixed
unit. In such cases the antenna installation must comply with the following requirements in order to assure
optimal performance and make sure human exposure to radio frequency electromagnetic energy is within the
guidelines set forth in the above standards:

● The antenna must be mounted outside the building

● Mount the antenna on a tower if at all possible

● If the antenna is to be mounted on a building then it must be mounted on the roof.

As with all fixed site antenna installations, it is the responsibility of the licensee to manage the site in accordance
with applicable regulatory requirements and may require additional compliance actions such as site survey
measurements, signage, and site access restrictions in order to insure that exposure limits are not exceeded.

Radiated Power of

Vehicle-installed Mobile

Two-way Radio

7 to 15 Watts 30.5 cm (1 Ft)
16 to 50 Watts 61 cm (2 Ft)
More than 50 Watts 91.5 cm (3 Ft)

Minimum Distance

From T ransmitting

Antenna

viii SAFETY AND GENERAL INFORMATION

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.

Chapter 1

INTRODUCTION

NOTE

Before operating or testing these units, please read the Safety Information Section in the
front of this manual.

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. Motorola's 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.

1-2 INTRODUCTION

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: 08 00 96 90 95 Switzerland: 1 55 30 82
Ireland: 18 00 55 50 21 Iceland: 80 08 147

Or dial Customer Care Centre:

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 part number is appended with an asterisk, the part 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 enquiries should be directed to your local Technical Support Team.

Tel: [phone]

Warranty and Service Support 1-3

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: [phone]
Fax: [phone]
Email: [e-mail]

East Europe, Turkey and Central Asia

Siggy Punzenberger
Telephone: [phone]
Fax: [phone]
Email: [e-mail]

Scandinavia - Bjorn Rambert
Telephone: [phone]
Fax: [phone]
Email: [e-mail]

Central Europe (Germany, Benelux,
Austria & Switzerland) - Customer Connect

Telephone: [phone]
Fax: [phone]
Email: [e-mail]

France - Armand Roy
Telephone: [phone]
Fax: [phone]
Email: [e-mail]

Italy - Ugo Gentile
Telephone: [phone]
Fax: [phone]
Email: [e-mail]

Middle East & Africa - Ralph Schubert
Telephone: [phone]
Fax: [phone]
Email: [e-mail]

2.6 Related Documents

The following documents are directly related to the use and maintainability of this product.

Title Language Part Number

GM100 Series Product Manual English ENLN4147
GM300 Series Product Manual English

GM600/GM1200 Series Product Manual English

German
French
Italian
Spanish
Russian

German
French
Russian

ENLN4137
ENLN4138
ENLN4139
ENLN4140
ENLN4141
ENLN4142

ENLN4143
ENLN4144
ENLN4145
ENLN4146

1-4 INTRODUCTION

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 mobile radio model number and its specific characteristics.

Table 1-1 Radio Model Number (Example: MDM25KHC9AN1AE)

Type of

Unit

MD M 25 K

Model

Series

Freq.

Band

VHF

(136-

174MHz)

M = Mobile

MD = Motorola Internal Use

UHF 1

(403-

470MHz)

UHF 2

(450-

527MHz)

Power

Level

1-25WCGM140,

R

25-40W
40-60W

S

H

K

Physical

Packages

GM340,

GM640

N

GM380,

GM1280

F

GM160
GM360
GM660

Channel
Spacing

9

Program-

mable

Protocol

AN

Conventional

5 T one

AA

Conventional

MDC

CK

MPT

Feature

Level

1

GM140
GM340
GM640

O

Databox

(5Tone)

5

GM160
GM360
GM660

Model

Revision

AE

Model

Package

B

LB1

29-36MHz

C

LB2

36-42MHz

D

LB3

42-50MHz

A

Databox

8

GM380

GM1280

7

Databox

(MPT)

1.0 Introduction

!

This chapter of the manual describes:

■

■

preventive maintenance

■

■

safe handling of CMOS devices

■

■

repair procedures and techniques

2.0 Preventive Maintenance

The radios do not require a scheduled preventive maintenance program; howe ver, periodic visual
inspection and cleaning is recommended.

2.1 Inspection

Check that the external surfaces of the radio are clean, and that all e xternal controls and s witches
are functional. It is not recommended to inspect the interior electronic circuitry.

Chapter 2

MAINTENANCE

2.2 Cleaning

The following procedures describe the recommended cleaning agents and the methods to be
used when cleaning the external and internal surfaces of the radio. External surfaces include the
front cover, housing assembly, and battery case. These surfaces should be cleaned whenever a
periodic visual inspection reveals the presence of smudges, grease, and/or grime.

NOTE Internal surfaces should be cleaned only when the radio is disassembled for servicing or

The only recommended agent for cleaning the external radio surf aces is a 0.5% solution of a mild
dishwashing detergent in water. The only factory recommended liquid for cleaning the printed
circuit boards and their components is isopropyl alcohol (70% by volume).

CAUTION: The effects of certain chemicals and their vapors can have harmful results on
certain plastics. Aerosol sprays, tuner cleaners, and other chemicals should be avoided.

1. Cleaning External Plastic Surfaces

2. Cleaning Internal Circuit Boards and Components

repair.

The detergent-water solution should be applied sparingly with a stiff, non-metallic, short­bristled brush to work all loose dirt away from the r adio . A soft, absorbent, lintless cloth or
tissue should be used to remove the solution and dry the radio. Make sure that no water
remains entrapped near the connectors, cracks, or crevices.

Isopropyl alcohol may be applied with a stiff , non-metallic, short-bristled brush to dislodge
embedded or caked materials located in hard-to-reach areas. The brush stroke should
direct the dislodged material out and away from the inside of the radio. Make sure that
controls or tunable components are not soaked with alcohol. Do not use high-pressure
air to hasten the drying process since this could cause the liquid to collect in unwanted
places. Upon completion of the cleaning process, use a soft, absorbent, lintless cloth to
dry the area. Do not brush or apply any isopropyl alcohol to the frame, front cover, or

2-2 MAINTENANCE

back cover.

NOTE Always use a fresh supply of alcohol and a clean container to prevent contamination by

dissolved material (from previous usage).

3.0 Safe Handling of CMOS and LDMOS

Complementary metal-oxide semiconductor (CMOS) devices are used in this family of radios.
CMOS characteristics make them susceptible to damage by electrostatic or high v oltage charges.
Damage can be latent, resulting in failures occurring weeks or months later. Therefore, special
precautions must be taken to prevent device damage during disassembly, troubleshooting, and
repair.

Handling precautions are mandatory for CMOS circuits and are especially important in low
humidity conditions. DO NO T attempt to disassemb le the radio without first ref erring to the CMOS
CAUTION paragraph in the Disassembly and Reassembly section of the manual.

4.0 General Repair Procedures and Techniques

Parts Replacement and Substitution

When damaged parts are replaced, identical parts should be used. If the identical replacement
component is not locally available, check the parts list for the proper Motorola part number and
order the component from the nearest Motorola Communications parts center listed in the “Piece
Parts” section of this manual.

Rigid Circuit Boards

The family of radios uses bonded, multi-la yer, printed circuit boards. Since the inner lay ers are not
accessible, some special considerations are required when soldering and unsoldering
components. The through-plated holes may interconnect multiple layers of the printed circuit.
Therefore, care should be exercised to avoid pulling the plated circuit out of the hole.

When soldering near the 18-pin and 40-pin connectors:

■

■

avoid accidentally getting solder in the connector.

■

■

be careful not to form solder bridges between the connector pins

■

■

closely examine your work for shorts due to solder bridges.

General Repair Procedures and Techniques 2-3

Chip Components

Use either the RLN4062 Hot-Air Repair Station or the Motorola 0180381B45 Repair Station for
chip component replacement. When using the 0180381B45 Repair Station, select the TJ-65 mini­thermojet hand piece. On either unit, adjust the temperature control to 370 °C (700 °F), and
adjust the airflow to a minimum setting. Airflow can vary due to component density.

■

■

To remove a chip component:

1. Use a hot-air hand piece and position the nozzle of the hand piece approximately 0.3 cm

(1/8") above the component to be removed.

2. Begin applying the hot air. Once the solder reflows, remove the component using a pair

of tweezers.

3. Using a solder wick and a soldering iron or a power desoldering station, remove the

excess solder from the pads.

■

■

To replace a chip component using a soldering iron:

1. Select the appropriate micro-tipped soldering iron and apply fresh solder to one of the

solder pads.

2. Using a pair of tweezers, position the new chip component in place while heating the

fresh solder.

3. Once solder wicks onto the new component, remove the heat from the solder.

4. Heat the remaining pad with the soldering iron and apply solder until it wicks to the

component. If necessary, touch up the first side. All solder joints should be smooth and
shiny.

■

■

To replace a chip component using hot air:

1. Use the hot-air hand piece and reflow the solder on the solder pads to smooth it.

2. Apply a drop of solder paste flux to each pad.

3. Using a pair of tweezers, position the new component in place.

4. Position the hot-air hand piece approximately 0.3 cm (1/8” ) above the component and

begin applying heat.

5. Once the solder wicks to the component, remove the heat and inspect the repair. All

joints should be smooth and shiny.

2-4 MAINTENANCE

Shields

Removing and replacing shields will be done with the R1070 station with the temperature control
set to approximately 215°C (415°F) [230°C (445°F) maximum].

■

■

To remove the shield:

1. Place the circuit board in the R1070 circuit board holder.

2. Select the proper heat focus head and attach it to the heater chimney.

3. Add solder paste flux around the base of the shield.

4. Position the shield under the heat-focus head.

5. Lower the vacuum tip and attach it to the shield by turning on the vacuum pump.

6. Lower the focus head until it is approximately 0.3 cm (1/8”) above the shield.

7. Turn on the heater and wait until the shield lifts off the circuit board.

8. Once the shield is off, turn off the heat, grab the part with a pair of tweezers, and turn off

the vacuum pump.

9. Remove the circuit board from the R1070 circuit board holder.

■

■

To replace the shield:

1. Add solder to the shield if necessary, using a micro-tipped soldering iron.

2. Next, rub the soldering iron tip along the edge of the shield to smooth out any excess

solder. Use solder wick and a soldering iron to remove excess solder from the solder
pads on the circuit board.

3. Place the circuit board back in the R1070 circuit board holder.

4. Place the shield on the circuit board using a pair of tweezers.

5. Position the heat-focus head over the shield and lower it to approximately 0.3 cm (1/8”)

above the shield.

6. Turn on the heater and wait for the solder to reflow.

7. Once complete, turn off the heat, raise the heat-focus head and wait approximately one

minute for the part to cool.

8. Remove the circuit board and inspect the repair. No cleaning should be necessary.

Notes For All Schematics and Circuit Boards 2-5

5.0 Notes For All Schematics and Circuit Boards

* Component is frequency sensitive. Refer to the Electrical Parts List for value and usage.

1. Unless otherwise stated, resistances are in Ohms (k = 1000), and capacitances are in picofarads
(pF) or microfarads (µF).

2. DC voltages are measured from point indicated to chassis ground using a Motorola DC
multimeter or equivalent. Transmitter measurements should be made with a 1.2 µH choke in
series with the voltage probe to prevent circuit loading.

3. Interconnect Tie Point Legend:
16_8MHz 16.8MHz Reference Frequency
3V3 Regulated 3.3V Supply Voltage for Voice Storage
5V Regulated 5V Supply Voltage for RF Circuitry
5V Regulated 5V Supply Voltage (Control Head)
5V RF Regulated 5V Supply Voltage for RF Circuitry
5V SOURCE 5V Signal to Switch On Control Head
5VD Regulated 5V Supply Voltage for Digital Circuitry
9V3 Regulated 9.3V Supply Voltage
9V3FLT Filtered 9.3V Supply Voltage
A+ 13.2V Supply Voltage
ADDR *P Address Lines
AN Analog Lines to Analog to Digital Converter
ANALOG INPUT 2 External Keypad Matrix Column Signal
ANALOG INPUT 3 External Keypad Matrix Row Signal
BATTERY VOLTAGE Battery Voltage Sense Line
BL A GREEN Back Light Anode Green
BL A RED Back Light Anode Red
BL GREEN Green Back Light Control
BL K GREEN Back Light Cathode Green
BL K RED Back Light Cathode Red
BL KP Green Green Keypad Back Light Control
BL KP RED Red Keypad Back Light Control
BL LCD GREEN Green Display Back Light Control
BL LCD RED Red Display Back Light Control
BL RED Red Back Light Control
BOOT CNTRL Bootstrap Mode Enable Signal
BOOT MODE Boot Mode Select
BOOT PWR ON Control Head Switch On Signal
BOOT SCI RX Serial Communication Interface Receive Line
BOOT SCI TX Serial Communication Interface Transmit Line
BOOT VPP Boot Mode Select
BUS+ Bi-directional Serial Communication Line
BWSELECT Signal to select between the Ceramic Filter Pairs

2-6 MAINTENANCE

CH ACT Channel Activity Indicator Signal (Fast Squelch)
CH KP ID Control Head Keypad ID (Data) Lines
CH REQUEST Control Head Request from Control Head *P
CLK Clock Signal
CNTLVLTG PA Power Control Voltage
CNTR AUDIO Audio Lines of the Controller
COL x Keypad Matrix Column x
CSX Chip Select Line PCIC / FRACN
DATA Data Signal
DC POWER ON Electronic Switching On or Off of the Radio's Voltage Regulators
DISCAUDIO Audio Output Signal from the Receiver IC
ECLK Clock (not used)
EE CS EEPROM Chip Select
EMERGENCY CONTROL Emergency Line to switch on the Radio's Voltage Regulators
EXP BD REQ Service Request Line from Expansion Board
EXP1 CS Expansion Board Chip Select 1
EXP2 CS Expansion Board Chip Select 2
EXT KP COL External Keypad Matrix Column Signal
EXT KP ROW External Keypad Matrix Row Signal
EXT MIC External (from Accessory Connector) Microphone Input
EXT SWB+ External Switched 13.2V Supply Voltage
F1200 Interrupt Line from ASFIC CMP
FECTRL 1 Control Voltage for Front End Filter
FECTRL 2 Control Voltage for Front End Attenuator Switch
FLASH CE Flash Chip Select
FLASH OE Flash Output Enable
FLAT RX SND Option Board Audio Output Signal
FLAT TX RTN Flat TX Input from Option Board and Accessory Connector
FLT A+ Filtered 13.2 V Supply Voltage
GP x IN General Purpose Input x
GP x IN ACC y General Purpose Input x from Accessory Connector Pin y
GP x IN OUT ACC y General Purpose Input /Output x from Accessory Connector Pin

y
GP x OUT General Purpose Output x
GP x OUT ACC y General Purpose Input x from Accessory Connector Pin y
GPIO General Purpose Input Output Lines
HANDSET AUDIO Handset Audio Output
HOOK Hang-up Switch Input
HSIO High Speed Clock In / Data Out
IF First Intermediate Frequency Signal
IGNITION CONTROL Ignition Line to switch on the Radio's Voltage Regulators

Notes For All Schematics and Circuit Boards 2-7

IN 5V RF REG Supply Voltage for 5V Regulator in RF Section
INT KP COL Internal Keypad Matrix Column Signal
INT KP ROW Internal Keypad Matrix Row Signal
INT MIC Internal (from Control Head) Microphone Input
INT SWB Internal Switched 13.2V Supply Voltage
INT SWB+ Internal Switched 13.2V Supply Voltage
IRQ Interrupt Request from Control Head
K9V1 9.1V in Transmit Mode
KEYPAD ID Keypad Identification Line
LCD A0 LCD Control / Display Data Select
LCD CS LCD Chip Select
LCD DATA LCD Data Lines
LCD E RD LCD Enable Read
LCD RW WR LCD Read Write Control
LED CNTRL LED Control Lines
LED GREEN Green LED Control
LED RED Red LED Control
LED YELLOW Yellow LED Control
LOCK Lock Detect Signal from Synthesizer
LSIO Low Speed Clock In / Data Out
LVZIF CS LVZIF Chip Select (not used)
MIC Microphone Input
MISO Serial Peripheral Interface Receive Line
MODIN Modulation Signal into the Synthesizer
MOSBIAS 2 PA Bias Voltage for second Stage
MOSBIAS 3 PA Bias Voltage for third Stage
NOISE BLNKR Noise Blanker Enable (Low Band only)
ON OFF CONTROL Service Request Line from Control Head / Manual Switching On

of the Radio's Voltage Regulators
ON OFF SENSE (Control Head)On Off Sense Line to Control Head *P
ON OFF SENSE (Controller) Service Request Line from Control Head
OPT CS Option Board Chip Select
OPT PTT PTT from Option Board
PA PWR SET ASFIC Output Voltage to set the Transmitter Power
PA SWB Switches Supply Voltage for PA Current Control Circuitry
PASUPVLTG 13.2 V Supply Voltage of the Transmitter PA
PCIC MOSBIAS 1 PA Bias Voltage for first Stage
PRESC Prescaler Signal from VCO to Synthesizer
PTT IRDEC Microphone PTT Input
PTT IRDECODER Microphone PTT Input
R W Read Write Signal for RAM / Flash

2-8 MAINTENANCE

RAM CS RAM Ship Select
RDY Service Request Line from Option Board
REF CS Reference Chip Select (not used)
RESET Reset Line
ROW x Keypad Matrix Row x
RSSI Received Signal Strength Indicator
RX ADAPT Flat TX Path Disable during Transmitter Key-up
RX AUD RTN Option Board Input / Output of Receiver Audio Path
RX FLAT FILTERED AUDIO Flat or Filtered Audio to Accessory Connector
RXIN RF Signal from Antenna Switch into the Receiver
RXINJ RF Signal from the VCO into the Mixer
SCI RX Serial Communication Interface Receive Line
SCI TX Serial Communication Interface Transmit Line
SPI Serial Peripheral Interface Bus
SPKR- Negative Audio PA Speaker Output
SPKR+ Positive Audio PA Speaker Output
SQ DET Squelch Detect Signal
SYN *P Clock Signal
TEMP SENSE Temperature Sense Line for LCD
TEMPSENSE Temperature Sense Line from PA to *P
TRB TX/RX VCO Switch Signal
TX AUD RTN Option Board Output to Transmit Audio Path
TX AUD SND Microphone Audio to Option Board
TXINJ RF Signal from the VCO into the Transmitter PA
U DRIVER Supply Voltage for PA Driver
U PREDRIVER Supply Voltage for PA Pre-driver
UNSW 5V Permanent 5V Supply
URX SND Filtered Audio Signal to Option Board
VAG 2.5V Reference Voltage for Analog Circuitry
VCOBIAS 1 Switch Signal from Synthesizer
VCOBIAS 2 Switch Signal from Synthesizer
VCOMOD Modulation Signal into VCO
VCTRL VCO Frequency Control Voltage
VDDA Regulated 5V for Digital Circuitry in RF Section
VOLTAGE SENSE Voltage Sense Line from LCD
VOLUME Volume Pot Output
VOX Voice Operated Transmit Level
VPP Boot Mode Select
VS AUDIOSEL Switch Signal to Enable Option Board Audio Output Signal
VS GAINSEL Voice Storage Gain Select Line
VS INT Voice Storage Interrupt Line

Notes For All Schematics and Circuit Boards 2-9

VS MIC Voice Storage Audio Signal into Microphone Path
VS RAC Voice Storage Row Address Clock Signal
VSF Voltage Super Filtered (5V)
VSTBY 5V Supply for *P when the Radio is switched off

4-LAYER CIRCUIT BOARD DETAIL VIEWING
COPPER STEPS IN PROPER LAYER SEQUENCE

SIDE 1

LAYER 1 (L1)
LAYER 2 (L2)
LAYER 3 (L3)
LAYER 4 (L4)

SIDE 2

INNER LAYERS

2-10 MAINTENANCE

1.0 Recommended T est Tools

Table 3-1 lists the service aids recommended for working on the radio. While all of these items are
available from Motorola, most are standard workshop equipment items, and any equivalent item
capable of the same performance may be substituted for the item listed.

Table 3-1 Service Aids

Chapter 3

SERVICE AIDS

Motorola Part

Number

RLN4460_ Portable Test Set Enables connection to audio/accessory jack.

RKN4081_ Programming Cable with

Internal RIB

RLN4853_ 10 to 20 Pin Adapter Connects RKN4081_ to the radio accessory

RKN4083_ Mobile Programming/Test

Cable
GTF374_ Program Cable Connects RIB to Radio microphone input
RLN4008_ Radio Interface Box Enables communications between radio and

HLN8027_ Mini UHF to BNC Adaptor Adapts radio antenna port to BNC cabling of

GPN6133_ Power Supply Provides the radio with power when bench

EPN4040_ Wall-Mounted Power Supply Used to supply power to the RIB (UK).

Description Application

Allows switching for radio testing.
Includes radio interface box (RIB) capability.

connector.
Connects radio to RIB (RLN4008_).

computer’s serial communications adapter.

test equipment.

testing.

EPN4041_ Wall-Mounted Power Supply Used to supply power to the RIB (Euro)
8180384J59 Housing Eliminator (short) Test Fixture used to bench test the radio pcb
8180384L95 Housing Eliminator

(short + top)
8180384J60 Housing Eliminator

(medium)
8180384J61 Housing Eliminator (long) Test Fixture used to bench test the radio pcb
3080369B71 Computer Interface Cable Connects the RIB to the Computer (25-pin)
3080369B72 Computer Interface Cable Connects the RIB to the Computer 9-pin

6686119B01 Removal Tool Assists in the removal of radio control head.

Test Fixture used to bench test the radio pcb.
(Radio using pressure pads to retain pcb)

Test Fixture used to bench test the radio pcb

(Use for IBM PC AT - other IBM models use
the B71 cable above)

3-2 SERVICE AIDS

2.0 Test Equipment

Table 3-2 lists test equipment required to service the radio and other two-way radios.

Table 3-2 Recommended T est Equipment

Motorola Part

Number

R2600_NT Comms System Analyzer

(non MPT)

R2680_NT Comms System Analyzer

( MPT1327) to be ordered
with
RLN1022_ (H/W)
RLN1023_ (S/W)

*R1072_ Digital Multimeter AC/DC voltage and

*R-1377_ AC Voltmeter 100µV to 300V, 5Hz -

WADN133 Delay Oscilloscope 2 Channel 40MHz

Description Characteristics

This monitor will
substitute for items
with an asterisk*

This monitor will
substitute for items
with an asterisk*.

1MHz, 10Megohm
input impedance

bandwidth,
5mV/cm - 20 V/cm

Application

Frequency/deviation
meter and signal
generator for
widerange
troubleshooting and
alignment

Frequency/deviation
meter and signal
generator for
widerange
troubleshooting and
alignment

current
measurements

Audio voltage
measurements

Waveform
measurements

R1440_
0180305F17

0180305F31
0180305F39
RLN4610

T1013_
S1339_ RF Millivolt Meter 100mV to 3 VRF.

R1011_/220V 220V Power Supply 0 - 40V 0 - 40A Programmable

Wattmeter,
Plug-in Elements

Plug-in Elements
Plug-in Elements
Carry case

RF Dummy Load

Thruline 50-Ohm,
±5% accuracy
100W, 25 - 60MHz
25W, 100-250MHz
10W, 200-250MHz
Wattmeter and
6 elements

10kHz to 1.2GHz

Transmitter power
output
measurements

RF level
measurements