Motorola CM200, PM400, Radius CM300, Radius CM200 Service Manual

M

CM200/CM300/PM400

Radios

Detailed Service Manual

6881098C00-A

Foreword

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.

Note:

Before operating or testing these units, please read the Product Safety and RF Exposure
Compliance section.

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.

MOTOROLA, The Stylized M logo, and Radius are trademarks of Motorola, Inc.
All other product or service names are the property of their respective owners.
© 2004, 2007 Motorola, Inc. All rights reserved. Printed in U.S.A.

ii

CM200/CM300/PM400

Radios

Detailed Service Manual

6881098C00-A

Contents

Section 1 Service Maintainability

Section 2 Control Head Service Information

Section 3 UHF2 Low Power (1-25 W) Service Information (438-470 MHz)

Section 4 UHF2 High Power (25-40 W) Service Information (438-470 MHz)

Section 5 UHF3 High Power (25-40 W) Service Information (465-495 MHz)

Notes

THIS PAGE INTENTIONALLY LEFT BLANK

M

CM200/CM300/PM400

Radios

Service Maintainability

Issue: November, 2007

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

SAFETY INFORMATION .......................................................................................... v

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

3.0 Replacement Parts Ordering ...............................................................................1-2

3.1 Basic Ordering Information.............................................................................1-2

3.2 Motorola Online ..............................................................................................1-2

3.3 Mail Orders.....................................................................................................1-2

3.4 Telephone Orders...........................................................................................1-2

3.5 Fax Orders......................................................................................................1-2

3.6 Parts Identification..........................................................................................1-3

4.0 Radio Model Information......................................................................................1-3

iii

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

Chapter 3 SERVICE AIDS

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

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

iv

Notes

SAFETY INFORMATION

Product Safety and RF Exposure Compliance

Note:

Before using this product, read the operating instructions for safe usage contained in the
Product Safety and RF Exposure booklet enclosed with your radio.

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 enclosed with your radio (Motorola Publication part number
68P81095C99) 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/governmentandenterprise.

v

vi

Notes

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
Authorized 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 Products and Solutions Organization (RPSO) offers a repair service to both end

users and dealers at competitive prices.

2. Radio Products and Solutions Organization (RPSO) supplies individual parts and modules that

can be purchased by dealers who are technically capable of performing fault analysis and repair.

* The Radio Products and Solutions Organization (RPSO) was formerly known as the Radio Products
Services Division (RPSD) and/or the Accessories and Aftermarket Division (AAD).

1-2 INTRODUCTION

3.0 Replacement Parts Ordering

3.1 Basic Ordering Information

When ordering replacement parts or equipment information, the complete identification number
should be included. This applied to all components, kits, and chassis. If the component part number is
not known, the order should include the number of the chassis or kit of which it is a part, a sufficient
description of the desired component to identify it.

3.2 Motorola Online

Motorola online users can access our on-line catalog at:
http://www.motorola.com/businessonline
To register for online access, please call 800-814-0601 (for U.S. and Canada Service Centers only).

3.3 Mail Orders

Send written orders to the following addresses:

Replacement Parts/
Test Equipment/Manuals/
Crystal Service Items:

Motorola Inc.
Radio Products and Solutions
Organization*
Attention: Order Processing
1307 E. Algonquin Road
Schaumburg, IL 60196
U.S.A.

3.4 Telephone Orders

Radio Products and Solutions Organization*
(United States and Canada)
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)
1-800-873-4668
8:30 AM to 5:00 PM (Eastern Standard Time)

Federal Government Orders: International Orders:

Motorola Inc.
U.S. Federal Government Markets
Division
Attention: Order Processing
7230 Parkway Drive
Landover, MD 21076
U.S.A.

Motorola Inc.
Radio Products and Solutions
Organization*
Attention: Order Processing
1307 E. Algonquin Road
Schaumburg, IL 60196
U.S.A.

3.5 Fax Orders

Radio Products and Solutions Organization*
(United States and Canada)
1-800-622-6210
1-847-576-3023 (International)

USFGMD
(Federal Government Orders)
1-800-526-8641 (For Parts and Equipment Purchase Orders)

Radio Model Information 1-3

3.6 Parts Identification

Radio Products and Solutions Organization*
(United States and Canada)
1-800-422-4210

* The Radio Products and Solutions Organization (RPSO) was formerly known as the Radio Products
Services Division (RPSD) and/or the Accessories and Aftermarket Division (AAD).

4.0 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: AAM50RNC9AA1)

Typ e of

Unit

AA M 50 R

Model

Series

Freq.
Band

UHF2

(438-470

MHz)

M = Mobile

AA = Country Code

UHF3

(465-495

MHz)

Power

Level

1-25 WCCM2009ProgrammableAAConventional

S

25-40 WFCM300

25-45 W

N

P

Q

Physical

Packages

PM400

Channel
Spacing

Protocol

MDC

Feature

Level

1

4/32 mini-U

3

64 mini-U

1-4 INTRODUCTION

Notes

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; however, periodic visual
inspection and cleaning is recommended.

2.1 Inspection

Check that the external surfaces of the radio are clean, and that all external controls and switches
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

The only recommended agent for cleaning the external radio surfaces 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 (100% 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

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

The detergent-water solution should be applied sparingly with a stiff, non-metallic, short­bristled brush to work all loose dirt away from the radio. 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
back cover.

2-2 MAINTENANCE

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 voltage
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 NOT attempt to disassemble the radio without first referring 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-layer, printed circuit boards. Since the inner layers 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:

Signal Name Signal Description

16_8MHz 16.8MHz Reference Frequency from Synthesizer to ASFIC
3V 3V RF regulator
5V 5V RF regulator
5V_CH Optional 5V for Control Head
9V Regulated 9.3V Supply Voltage
9R 9V to enable RX_INJ when RX_EN is active
ASFIC_CS ASFIC Chip Select
B+ 13.8V Supply Voltage
BATT_SENSE Battery Voltage Sense Line
BOOT_EN_IN_CH Boot Mode Select
BW_SEL Select BW (12.5 KHz, 25 KHz)
CH_ACT Channel Activity Indicator Signal (Fast Squelch)
COMM_DATA_SEL_CH Display Driver Command/ Data Select
D3_V3 Regulated 3.3V supply voltage for Voice Storage
DEMOD Audio Output Signal from the Receiver IC
DETECTOR_AUDIO_SEND_BRD Flat Audio to Option Board
DISPLAY_CS_CH Control Head Chip Select
EMERGENCY_ACCES_CONN Emergency line to switch on the radio voltage regulators
EMERGENCY_SENSE Emergency sense to µP
EXTERNAL_MIC_AUDIO ACCES_CONN External (from accessory connector) microphone input
F1200 Interrupt line from ASFIC CMP
FILT_SW_B+ Switched 13.8 V supply voltage
FLAT_TX_AUDIO_INPUT_ACCESS_CONN Flat TX input from accessory connector
HANDSE RX_AUDIO_CH Handset Audio Output
HOOK_CH Hang-up switch input
HSIO High Speed Clock In / Data Out
IGNITION Ignition Line to switch on the radio’s voltage regulator
KEYPAD_COL_CH Keypad Matrix Column
LOC_DIST Enable Attenuator for RX line
LSIO Low Speed Clock In / Data Out
MIC_AUDIO_CH Microphone Input

2-6 MAINTENANCE

MIC_PTT_CH Microphone PTT Input
MOD_IN Modulation Signal from ASFIC
MOD_OUT Modulation Signal to the Synthesizer
ONOFF_SENSE On off sense switch
OPT_DATA_R_OPRD DATA/Ready Request from Option Board
OPT_EN_OPBD Option Board Chip Select
PA_BIAS PA Control bias voltage
PA_CURRENT Not used
POST_LIMITER_TX

Flat TX Input from Option Board

AUDIO_RETURN_OPT_BRD
PROG x IN ACC y General Purpose Input x accessory connector Pin y
PROG x INOUT ACC y General Purpose Input/Output x accessory connector Pin y
PROG x OUT ACC y General Purpose Input x accessory connector Pin y
PWR_SET PA Power Control Voltage
RESET Reset Line
RSSI Received Signal Strength Indicator
RX RX signal
RX AUD RTN Option Board Input/Output of Receiver Audio Path
RX_AUDIO_OUTPUT_ACCESS_CONN Flat or filtered audio to accessory connector
RX_EN Enable Receiving
RX_INJ RF signal from VCO into the Receiver
SCI_CH Bi-directional serial communication line
SHIFT_R_CS SPI Chip select for the Control Head
SPI_CLK Serial peripheral interface bus CLOCK
SPI_MISO Serial peripheral interface bus data IN
SPI_MOSI Serial peripheral interface bus data OUT
SPKR- Negative Audio PA Speaker Output
SPKR- Negative Audio PA Speaker Output
SPKR+ Positive Audio PA Speaker Output
SQ_DET Squelch Detect Signal
SYNTH_CS Synth Chip Select
SYNTH_LOCK µP Clock Lock Signal
TX AUDIO_RETURN_OPT_BRD Option Board Output to Transmit Audio Path
TX AUDIO_SEND_OPT_BRD Microphone Audio to Option Board
TX_INJ RF signal from the VCO to transmitter PA
TX_EN Enable transmitting
UNMUTED RX_AUDIO_SEND_OPT_BRD Unmuted filtered audio to option board
uP_CLK µP Clock signal
VoL_INDIRECT Volume Pot Input
VOX Voice operated transmit level

Notes For All Schematics and Circuit Boards 2-7

VS AUDIO_SEL Switch signal to Enable option board audio output signal
VS GAIN_SEL Voice Storage Gain Select line
VS_MIC Voice Storage Audio Signal to microphone path
VS_INT Voice Storage Interrupt line
VS_RAC Voice storage Row Address Clock Signal
VSTBY 3.3 V supply for µP when the radio is switched off

2-8 MAINTENANCE

Notes

1.0 Recommended Test 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

No.

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

RVN4191_ Customer Programming

Software (CPS) - Software on
CDROM & Global Tuner

RKN4081_ Programming Cable with

Internal RIB

FKN8096_ Data/Flash Adapter Key Used with RKN4081 (10 to 8 pin adapter for

RKN4083_ Mobile Programming/Test Cable Connects radio to RIB (RLN4008_).via rear

FKN8113_ Adapter Cable Used with RKN4083 (20 to 16 pin adapter for

GTF374_ Program Cable Connects RIB to Radio microphone input.

RLN4008_ Radio Interface Box Enables communications between radio and

Description Application

Allows switching for radio testing.

Programs customer options and channel data.

Includes radio interface box (RIB) capability.

front Telco connector with Data/Flash switch).

accessory connector

rear accessory connector).

computer’s serial communications adapter.

HSN9412_ Wall-Mount Power Suppy Used to power the RIB. (120 V ac)

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

8180384N64 Housing Eliminator (25W) 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.

6680334F39 Hex Tool Assists in the removal of antenna connector.

test equipment.

(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 Test Equipment

Motorola Part No. Description Characteristics Application

R2000, R2600,
R2400, or R2001
with trunking
option for Privacy

Service Monitor This monitor will

substitute for items
listed below with an
asterisk *

Frequency/deviation meter and
signal generator for wide-range
troubleshooting and alignment

Plus™ and
Smartnet
Systems™

†

*R1049 Digital Multimeter Two meters recommended for AC/

DC voltage and current
measurements

*S1100 Audio Oscillator 67 to 200Hz tones Used with service monitor for

injection of PL tones

*S1053,
*SKN6009,
*SKN6001

AC Voltmeter,
Power Cable
for meter,

• 1 mV to 300 V

• 10 MΩ input
impedance

Audio voltage measurements

Test leads for meter

R1053 Dual-trace

Oscilloscope

R1443A Broadband

Wattmeter

S1339 RF Millivolt Meter 100 μV to 3 VRF, 10

20 MHz bandwidth,
5 mV/cm - 20 V/cm

Waveform measurements

Transmitter power output
measurements

RF level measurements

kHz to 1.2 GHz

*R1013 SINAD Meter Receiver sensitivity measurements

S1348 (prog) DC Power Supply 0-20 Vdc, 0-20 Amps Bench supply for 13.8Vdc

M

CM200/CM300/PM400

Radios

Control Head

Service Information

Issue: November, 2007

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 OVERVIEW

1.0 CM200 Model.......................................................................................................1-1

2.0 CM300/PM400 Models ........................................................................................1-1

Chapter 2 THEORY OF OPERATION

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

2.0 Control Head Model for CM200 ...........................................................................2-1

2.1 Power Supplies...............................................................................................2-1

2.2 SPI Interface...................................................................................................2-1

2.3 Keypad Keys ..................................................................................................2-2

2.4 Status LED’s and Back Light Circuit...............................................................2-2

2.5 Microphone Connector Signals ......................................................................2-2

2.6 Speaker ..........................................................................................................2-3

2.7 Electrostatic Transient Protection...................................................................2-3

3.0 Control Head Model for CM300/PM400...............................................................2-4

3.1 Power Supplies...............................................................................................2-4

3.2 SPI Interface...................................................................................................2-4

3.3 Keypad Keys ..................................................................................................2-5

3.4 LCD Driver......................................................................................................2-5

3.5 Status LED’s and Back Light Circuit...............................................................2-5

3.6 Microphone Connector Signals ......................................................................2-5

3.7 Speaker ..........................................................................................................2-6

3.8 Electrostatic Transient Protection...................................................................2-6

iii

Chapter 3 TROUBLESHOOTING CHARTS

1.0 Control Head CM200 Troubleshooting Chart.......................................................3-1

1.1 Control Head Failure ......................................................................................3-1

1.2 Button/Tones Select Error (Page 1 of 2) ........................................................3-2

1.3 Button/Tones Select Error (Page 2 of 2) ........................................................3-3

2.0 Control Head CM300/PM400 Troubleshooting Chart ..........................................3-4

2.1 Control Head Failure ......................................................................................3-4

2.2 Button/Tones Select Error (Page 1 of 2) ........................................................3-5

2.3 Button/Tones Select Error (Page 2 of 2) ........................................................3-6

Chapter 4 CONTROL HEAD PCB / SCHEMATICS / PARTS LISTS

1.0 Allocation of Schematics and Circuit Boards .......................................................4-1

2.0 Control Head CM200 - PCB 8488998U01 / Schematics .....................................4-3

iv

2.1 Control Head PCB 8488998U01 Parts List ....................................................4-5

3.0 Control Head CM300/PM400 - PCB 8489714U01 / Schematics......................... 4-6

3.1 Control Head PCB 8489714U01 Parts List ....................................................4-8

1.0 CM200 Model

The control head contains the internal speaker, the on/off/volume knob, the microphone connector,
several buttons to operate the radio, three indicator Light Emitting Diodes (LED) to inform the user
about the radio status, and a single character 7-segment display for numeric information e.g.
channel number.

Chapter 1

OVERVIEW

2.0 CM300/PM400 Models

The control head contains the internal speaker, the on/off/volume knob, the microphone connector,
several buttons to operate the radio, three indicator Light Emitting Diodes (LED) to inform the user
about the radio status, and an 8 character Liquid Crystal Display (LCD) for alpha - numerical
information e.g. channel number or call address name.

PERS4

P1 P3 P4

P2

PERS4

CM300

PM400

P1 P3 P4

P2

1-2 OVERVIEW

Notes

1.0 Introduction

This Chapter provides a detailed theory of operation for the Control head circuits. For details of the
trouble shooting refer to the related chapter in this section.

2.0 Control Head Model for CM200

The head contains the internal speaker, the on/off/volume knob, the microphone connector, several
buttons to operate the radio and three indicator Light Emitting Diodes (LED) to inform the user about
the radio status and a 7-segment display for numeric information.

Chapter 2

THEORY OF OPERATION

7-segment

7-segment
display

display

4

DTMF

DTMF

Resistors

Resistors

Keypads

Keypads

2.1 Power Supplies

BCD To

BCD To

7-segment

7-segment

Control line

Control line

Boot_res / SCI

Boot_res / SCI

DTMF

DTMF
Row/Column

Row/Column

Mux.

Mux.

Control

Control

Keypad

Keypad

Backlight

Backlight

9.3VRow/Column

9.3VRow/Column

Shift

Shift

Register

Register

9.3V

9.3V

PTT

PTT

circuit

circuit

Boot_res (DTMF-

Boot_res (DTMF­Column)/ SCI

Column)/ SCI
(DTMF-Row)

(DTMF-Row)

2 pin speaker

2 pin speaker
connector

connector

The power supply to the head is taken from the host radio’s 9.3V via connector J803-9, The 9.3V is
used for the LEDs and back light, the 5V is used for the LCD driver and level shifter. The stabilized
3V is used for the other parts.

2.2 SPI Interface

The host radio (master) communicates with the head through its SPI bus. Three lines are
connected to the shift register (U801):SPI clock (J803-17), SPI MOSI (J803-16) and shift register
chip select (J803-15).

2-2 THEORY OF OPERATION

When the host radio needs to send date to the shift register, the radio asserts the shift register chip
select and the data is loaded to the shift register. For example, the host radio sends data to change
display channel or change LED status.

2.3 Keypad Keys

The head keypad is a four-key design. All keys are configured as two analog lines read by µP. The
voltage on the analog lines varies between 0V and 3.3 V depending on which key is pressed. If no
key is pressed, the voltage at both lines is 3.3V. The key configuration can be thought of as a matrix
where the two lines represent one row and one column. Each line is connected to a resistive divider
powered by 3.3V. If a button is pressed, it will connect one specific resistor of each divider line to
ground level and thereby reduce the voltages on the analog lines. The voltages of the lines are A/D
converted inside the µP (ports PE 6 - 7) and specify the pressed button. To determine which key is
pressed, the voltage of both lines must be considered.

The same analog lines also support a keypad microphone. A microphone key press is processed in
the same manner like a head key press.

2.4 Status LED’s and Back Light Circuit

All indicator LEDs (red, yellow, and green) are driven by current sources. To change the LED status
the host radio sends a data message to the head shift register via the SPI bus. The head shift
register determines the LED status from the received data and switches the LEDs on or off via Q5­Q7.

The back light for the keypad is always on. The back light current for the keypad is drawn from the

9.3 V source and led by two current sources. The LED current is determined by the resistor at the
emitter of the respective current source transistor.

2.5 Microphone Connector Signals

The MIC_PTT line (J802-3) is grounded when the PTT button on the microphone is pressed. When
released, this line is pulled to 9.3V by R805. Two transistor stages (Q802, Q801 and associated
parts) are used to level shift between 9.3V and 3.3V required for the uP while keeping the same
sense (active low for PTT pressed).

Two of the mic socket lines (J802-2,7) have dual functions depending on the type of microphone or
SCI lead connected. An electronic switch (U803) is used to switch these two lines between mic
keypad operation or SCI operation. The switch (mux) is led by the uP through J803-20 with level
shifting (and inversion) provided by transistor Q812. When MUX_CTRL (J803-20) is low the
electronic switch is in the mic keypad mode. The mic socket (J802) pin 2 is connected to the keypad
row line that goes to J803-13 and pin 7 is connected to the keypad column line that goes to J803-12.
When MUX_CTRL (J803-20) is high the electronic switch is in the SCI mode. The mic socket (J802
pin 2) is connected to the SCI line that goes to J803-4 and pin 7 is connected to the BOOT_RES line
that goes to J803-11.

The HOOK line (J802-6) is used to inform the uP which type of microphone or SCI lead is connected
to the microphone socket. The voltage of the HOOK line is monitored by the uP (port PE0,
MIC_SENSE) through a resistor divider on the main board. When the HOOK line is grounded (on
hook condition) or floating (2.8V nominal), the uP sets the mux (U803) for keypad operation to allow
the use of microphones with a keypad. When the HOOK line is connected to 9.3V, the uP sets the
mux for SCI operation. This mode is also used to select low cost mic operation where the gain of the
microphone path is increased (on the main board) to compensate for not having a pre-amp in the low
cost mic.

Control Head Model for CM200 2-3

If the BOOT_RES (J802-7) line is connected to >5V (e.g. 9.3V) at turn-on, the uP will start in boot
mode instead of normal operation. This mode is used to programme new firmware into the FLASH
memory (U404 mainboard).

2.6 Speaker

The head contains a speaker for the receiver audio. The receiver audio signal from the differential
audio output of the audio amplifier located on the radio’s ler is fed via connector J803-1, 2 to the
speaker connector P801 pin 1 and pin 2. The speaker is connected to the speaker connector P801.
The control head speaker must be disconnected if an external speaker, connected on the accessory
connector, is used.

2.7 Electrostatic Transient Protection

Electrostatic transient protection is provided for the sensitive components in the control head by
diodes VR801, VR802, VR803 and VR804. The diodes limit any transient voltages to tolerable
levels. The associated capacitors provide Radio Frequency Interference (RFI) protection.

2-4 THEORY OF OPERATION

3.0 Control Head Model for CM300/PM400

The control head contains the internal speaker, the on/off/volume knob, the microphone connector,
several buttons to operate the radio, three indicator Light Emitting Diodes (LED) to inform the user
about the radio status, and an 8 character Liquid Crystal Display (LCD) for alpha - numerical
information e.g. channel number or call address name.

9.3V

9.3V

LCD

LCD

LED

LED

Backlight

Backlight

Backlight

Backlight

Control

Control

Keypad

Keypad

Resistors

Resistors

Keypads

Keypads

3.1 Power Supplies

The power supply to the control head is taken from the host radio’s 9.3V via connector J103-9, The

9.3V is used for the LEDs and back light, the 5V is used for the LCD driver (U3) and level shifter
(U4). The stabilized 3V is used for the other parts.

LED

LED

Indicators

Indicators

Boot_Res / SCI

Boot_Res / SCI

DTMF

DTMF
Row/Column

Row/Column

Row/Column

Row/Column

Control line

Control line

Mux.

Mux.

Control

Control

LCD

LCD

Driver

Driver

Shift

Shift

Register

Register

Level

Level

Shifter

Shifter

PTT

PTT

circuit

circuit

Boot_Res (DTMF-

Boot_Res (DTMF­Column)/ SCI

Column)/ SCI
(DTMF-Row)

(DTMF-Row)

9.3V

9.3V

8 pin JACK

8 pin JACK
connector

connector

2-pin speaker

2-pin speaker
connector

connector

3.2 SPI Interface

The host radio (master) communicates with the control head through its SPI bus. Three lines are
connected to the shift register (U8):SPI clock (J103-17), SPI MOSI (J103-16), shift register chip
select (J103-15) and LCD driver chip select (J103-18).

When the host radio needs to send date to the shift register, the radio asserts the shift register chip
select and the data is loaded to the shift register. For example, the host radio sends data to change
display channel or change LED status.

Control Head Model for CM300/PM400 2-5

3.3 Keypad Keys

The control head keypad is a four-key design. All keys are configured as two analog lines read by
µP. The voltage on the analog lines varies between 0V and 3.3 V depending on which key is
pressed. If no key is pressed, the voltage at both lines is 3.3V. The key configuration can be thought
of as a matrix where the two lines represent one row and one column. Each line is connected to a
resistive divider powered by 3.3V. If a button is pressed, it will connect one specific resistor of each
divider line to ground level and thereby reduce the voltages on the analog lines. The voltages of the
lines are A/D converted inside the µP (ports PE 6 - 7) and specify the pressed button. To determine
which key is pressed, the voltage of both lines must be considered.

The same analog lines also support a keypad microphone. A microphone key press is processed in
the same manner like a control head key press.

3.4 LCD Driver

The LCD (36 x 4 segemnts) is controlled by U3. It has an on onboard clock controlled by R28
(typically 20kHz measured on pin 2). U3 is operated from the 5V supply and is controlled over the
SPI bus (SPI_CLK J103-17, SPI_MOSI J103-16, LCD chip select J103-18). Chip select is active low.
U2 is used to provide level shifting between the 3.3V logic from the uP and the 5V required by U3.

3.5 Status LED’s and Back Light Circuit

All indicator LEDs (red, yellow, and green) are driven by current sources. To change the LED status
the host radio sends a data message to the control head shift register via the SPI bus. The control
head shift register determines the LED status from the received data and switches the LEDs on or
off via Q8-Q10.

Backlighting for the LCD and keys is provided by a matrix of 21 LEDs arranged in 7 columns of 3
rows. The LEDs are driven from a constant current circuit (Q12, U1 and associated parts). There are
4 levels of baclight: off, low, medium and high, which are controlled by two outputs (pins 15, 1) from
the shift register (U8). The current is controlled by transistor Q12. The op amp U1 monitors the
current by measuring the voltage drop across R26, R27 and adjusting the bias of Q12 to achieve the
required level as set by the combined shift register o/ps. When in the off state, Q11 is also turned on
to clamp the base of Q12 so as to force it off. This ensures that the LEDs are fully off. Q11 is
controlled by pin 3 of the shift register U8.

3.6 Microphone Connector Signals

The MIC_PTT line (J102-3) is grounded when the PTT button on the microphone is pressed. When
released, this line is pulled to 9.3V by R33. Two transistor stages (Q14, Q13 and associated parts)
are used to level shift between 9.3V and 3.3V required for the uP while keeping the same sense
(active low for PTT pressed).

Two of the mic socket lines (J102-2, 7) have dual functions depending on which type of microphone
or SCI lead that is connected. An electronic switch (U41) is used to switch these two lines between
mic keypad operation or SCI operation. The switch (mux) is controlled by the uP through J103-20
with level shifting (and inversion) provided by transistor Q41. When MUX_CTRL (103-20) is low the
electronic switch is in the mic keypad mode. The mic socket (J102) pin 2 is connected to the keypad
row line that goes to J103-13 and pin 7 is connected to the keypad column line that goes to 103-12.
When MUX_CTRL (103-20) is high the electronic switch is in the SCI mode. The mic socket (J102
pin 2) is connected to the SCI line that goes to J103-4 and pin 7 is connected to the BOOT_RES line
that goes to J103-11.

2-6 THEORY OF OPERATION

The HOOK line (J102-6) is used to inform the uP which type of microphone or SCI lead is connected
to the microphone socket. The voltage of the HOOK line is monitored by the uP (port PE0,
MIC_SENSE) through a resistor divider on the main board. When the HOOK line is grounded (on
hook condition) or floating (2.8V nominal), the uP sets the mux (U8) for keypad operation to allow the
use of microphones with a keypad. When the HOOK line is connected to 9.3V, the uP sets the mux
for SCI operation. This mode is also used to select low cost mic operation where the gain of the
microphone path is increased (on the main board) to compensate for not having a pre-amp in the low
cost mic.

If the BOOT_RES (J102-7) line is connected to >5V (e.g. 9.3V) at turn-on then the uP will start in
boot mode instead of normal operation. This mode is used to programme new firmware into the
FLASH memory (U404 mainboard).

3.7 Speaker

The control head contains a speaker for the receiver audio. The receiver audio signal from the
differential audio output of the audio amplifier located on the radio’s controller is fed via connector
J103-1, 2 to the speaker connector P101 pin 1 and pin 2. The speaker is connected to the speaker
connector P101. The control head speaker must be disconnected if an external speaker, connected
on the accessory connector, is used.

3.8 Electrostatic Transient Protection

Electrostatic transient protection is provided for the sensitive components in the control head by
diodes VR1 - VR4. The diodes limit any transient voltages to tolerable levels. The associated
capacitors provide Radio Frequency Interference (RFI) protection.

TROUBLESHOOTING CHARTS

1.0 Control Head CM200 Troubleshooting Chart

1.1 Control Head Failure

Control Head Check

Chapter 3

Back light

OK ?

YES

Power-up

Alert Tone

OK ?

YES

Power-up

Red LED

Flash?

YES

Channel

Display

OK?

YES

No

No

No

No

Check 9.3V on

R808, R809

Check Speaker

Connection

Check

D801, Q806, U801

Check

DS801, U801, U802

Up/Down

P1 and P2

Alert Tone

Buttons OK?

YES

EXT
PTT

OK ?

Communication Ok

Control Head is OK

No

YES

No

Check R845, R846

R810, R811

Check Q801, Q802

No

Check Q803, Q812

3-2 TROUBLESHOOTING CHARTS

1.2 Button/Tones Select Error (Page 1 of 2)

Button/Tones Check

Check Voltage Levels on

TP401 (Keypad Col)

and TP402 (Keypad Row)

(see table on next page)

Right

Voltage

Up Key

?

No

YES

Right

Voltage

on Down Key

?

No

YES

Right

Voltage

on P1/P2

Keys ?

No

YES

Connect DTMF Mic

to TELCO Connector

Check R846, R811

on Control Head

Check R845, R810

on Control Head

Check R813, R814

on Control Head

Is there

0.75 Vdc on

MIC_SENSE

R429, on radio

A

No

Check Control Head

connectivity continuity

and R429, R430, D401

(main board)

Control Head CM200 Troubleshooting Chart 3-3

1.3 Button/Tones Select Error (Page 2 of 2)

A

Right

Voltage

on DTMF keys

?

Button/Tones Keys

Okay

Key_Col

No

YES

Does Q812

on Control Head

operates well

?

No

YES

Replace U803

on Control Head

Key_Column Voltage TP401

Replace

Q812

Voltage
(TP401)

0.008 V Up

0.008 V 0.675 V 1.346 V 1.997 V 2.650 V 3.300 V

0.675 V 1 2 3

1.346 V 4 5 6 7

1.997 V 8 9 0 *

2.650 V # C B A

3.300 V

Down

Key_Row Voltage TP402

Left KeyP1Right Key

P2

Idle

3-4 TROUBLESHOOTING CHARTS

2.0 Control Head CM300/PM400 Troubleshooting Chart

2.1 Control Head Failure

Control Head Check

Back light

OK ?

YES

Power-up

Alert Tone

OK ?

YES

Indicator

LED’

OK ?

YES

Display

OK?

YES

No

Check 9.3V on

Q12, U1 and associated

parts and U8

No

Check Speaker

Connection

No

S

No

Q8-Q10, U8 and 9.3V

Check

Check LCD

connections, U3 for 5V,

Osc. pins 1 & 2 activity

SCI thru via U4

Communication Ok

Up/Down
P1 and P2
Alert Tone

Buttons

OK?

YES

EXT
PTT

No

OK ?

YES

Control Head is OK

No

Check keypad resistors

Check Q13, Q802

No

Check Q803, Q14 and

associated parts

Control Head CM300/PM400 Troubleshooting Chart 3-5

2.2 Button/Tones Select Error (Page 1 of 2)

Button/Tones Check

Check Voltage Levels on

TP401 (Keypad Col)

and TP402 (Keypad Row)

(see table on next page)

Right

Voltage

Up Key?

No

YES

Right

Voltage

on Down

Key?

No

YES

Right

Voltage

on P1-P4

Keys ?

No

YES

Connect DTMF Mic

to TELCO Connector

Check R13, R45
on Control Head

Check R12, R49
on Control Head

Check R31, R29

R51, R11

on Control Head

Is there

0.75 Vdc on

MIC_SENSE

R429, on radio

A

No

Check Control Head

connectivity continuity

and R429, R430, D401

(Main Board)

3-6 TROUBLESHOOTING CHARTS

2.3 Button/Tones Select Error (Page 2 of 2)

A

Right

Voltage

on DTMF keys

?

Button/Tones Keys

Okay

Key_Col

No

YES

Does Q41

on Control Head

operates well

?

No

YES

Replace U8

on Control Head

Key_Column Voltage TP401

Replace

Q41

Voltage

(TP401)

0.008 V Up

0.008 V 0.675 V 1.346 V 1.997 V 2.650 V 3.300 V

0.675 V 1 2 3

1.346 V 4 5 6 7

1.997 V 8 9 0 *

2.650 V # C B A

3.300 V

Down

Key_Row Voltage TP402

Left KeyP1Right Key

P2

P3 P4 Idle

CONTROLHEAD PCB / SCHEMATICS / PARTS LISTS

1.0 Allocation of Schematics and Circuit Boards

Table 4-1 Control Head Diagrams and Parts Lists

PCB :

Control Head CM200

8488998U01 Main Board Top Side
8488998U01 Main Board Bottom Side

SCHEMATICS

Sheet 1 of 1

Parts List

8488998U01 Page 4-5

Table 4-2 Control Head Diagrams and Parts Lists

PCB :

Control Head CM300/PM400

8489714U01 Main Board Top Side
8489714U01 Main Board Bottom Side

Page 4-3
Page 4-3

Page 4-4

Page 4-6
Page 4-6

Chapter 4

SCHEMATICS

Sheet 1 of 1

Parts List

8489714U01 Page 4-8

Page 4-7

4-2 CONTROLHEAD PCB / SCHEMATICS / PARTS LISTS

Notes

Control Head CM200 - PCB 8488998U01 / Schematics 4-3

2.0 Control Head CM200 - PCB 8488998U01 / Schematics

SHOWN FROM SIDE 1

D801

S801

D805

J802

D804

SH1

DS801

S802

J805

J804

D806

D802

D803

1

1

1 1 1

1

1

1

M801

8488998u01_p3

SHOWN FROM SIDE 2

C801

C802

C803

C804

C805

C806

C807

C808

C809

C810

C811

C812

C813

C814

C815

C816

C817

C818

C819

C820

C821

C822

C823

C824

C825

C826

C827

C832

C833

C834

C836

M802

M803

M804

P801

Q802

Q803

Q804

Q805

Q806

Q811

Q812

R801

R802

R803

R804

R805

R806

R807

R808

R809

R810

R811

R813

R816

R818

R819

R820

R821
R822
R823
R824
R825

R826
R827

R829

R830

R831

R832

R833

R834

R839

R840

R841

R842

R843

R844

R845

R846

R847

R848

R849

R850

U801

VR802VR803

VR804

Q801

R842

J803

Control Head CM200 PCB 8488998U01

Top Side

Bottom Side

4-4 Control Head CM200 - PCB 8488998U01 / Schematics

DNP

Change to 1%

Change to 1%

COL

ROW

COL

DNP

DNPDNP

DNP

DNP

UP

DOWN

DNP

DNP

DNP

ROW

Change to 1%

Change to 1%

Change to 1%

Place under the 7-segment

MIC. PTT
MIC. AUDIO

SPI_MOSI

HOOK

RX. AUDIO

SPKR-

SPKR+

SPKR-

SPKR+

KEY_ROW

KEY_COL

COM/DATA_SEL

SPI_CLK
SH_R_CS

DISP_CS

DIS_RES

BOOT_RES

BOOT_RES

DNP

F1

F2

DNP

RED LED

GREEN LED

YELLOW LED

DNPDNP DNP

THESE ARE THE

ESD PROTECTION

MAIN BOARD CONNECTOR

MICROPHONE CONNECTOR

SPEAKER CONNECTOR

HOOK

9.3 V

MIC. AUDIO

MIC. PTT

SCI

RX. AUDIO

KEYPAD BACKLIGHT

CONTACTS (SPRINGS)

SCI

J803-22

220.p

R845

51.K

R846

VR803

G2

J803-21

G1

J803-10

18
10

BI

J803-18

19

J803-19

6

J803-6

J803-4

1

4

J803-1

J803-13

13

17

J803-17

7

9

J803-9

J803-7

12

DISPL_CS

J803-12

20

J803-20

J803-8

8

CH_PTT

J803-5

5

3

J803-3

J803-11

11

J803-15

OE

TELCO_PTT

CH_PTT

TELCO_PTT

COMM_CATH_2

ANODE_B

ANODE_A

HDSP-513G

15
16

S802

4

S801

6C65

C5

C4

2

J803-16

R809

3.3K

J803-2

D3_3V

SH1

432

1

SHIELD

0.

PIN2

2

R850

CONTACT

13K

PIN22PIN1

1

J804

CONTACT

R848

PIN1

1

J805

10.K

R849

R844

10.K

R847

D3_3V D3_3V

51.K

10.K

C836

9_3V

R843

10.K

Q812

9_3V

Q811

10.K

22.K

R840

R842

22.K

R839

9_3V9_3V

R832

20.K20.K

R831

R841

C833

100n

10.K

0.

0.

R834

100n

R833

13

X1

MC14053B

3

C832

C

9

B

10

11

Z1

Z0

5

Z

4

Y1

1

Y0

2

Y

15

X0

12

X

14

VEE

7

VCC

16

GND

8

EN

6

1

M804

A

U803

C834

1

M803

22.n

1

M801

C817

1

M802

20.

VDD

16

LT

3

LE

5

G

VR804 220.p

C2

11

C1

2

BI4B2

U802

VSS

8

14

F

15

E

9

D2

10

D1

6

C824

12

B1

1

A2

13

A1

7

MC14511BFEL

220.p

C826

220.p

220.p 220.p

C818C816

220.p

C819 C821

220.p

C820

220.p

220.p

C822

C803

220.p

C801

220.p

C805

220.p 220.p 220.p

C809C807 C811

220.p

C813

220.p

220.p

C814

220.p

C812

220.p

C810C806

220.p

C808

220.p 220.p

220.p

9_3VD3_3V

9_3V

C804

9_3V

9_3V

9_3V

9_3V

D3_3V

D3_3V

C802

9_3V D3_3V

33.

33.

R827

33.

R825

R826

R824

R823

R822

33.

33.

33.

33.

R821

1n

C823

10.K

Q802

47.K

R807

R806

10.K

R805

47.K

47.K

R804

Q801

R803

680.

R802

R820

680.

3

C3

2

C2

1

C1

TOUCH_SW_MARLIN

3

C3

2C21

C1

TOUCH_SW_MARLIN

6

C65C5

4

C4

10u

0.

C815

R830

R810

470.

HSMG-C670

D806

R808

300.

0.

R801

HSMG-C670

D804

1

J802-1

5

J802-5

2

J802-2

4

J802-4

3

J802-3

7

J802-7

6

J802-6

8

J802-8

DS801

COMM_CATH_1

ANODE_G

ANODE_F

ANODE_E

ANODE_DP

ANODE_D

ANODE_C

OE

DISPL_CS

BI

R811

0.

22K

R813 R816

D801

13K

D802

HSMH-C670

D803

HSMY-C670

Q804

HSMG-C670

Q805

Q806

1

P801-1

2

P801-2

R818 R819

3.9K

C825

680.

CLK_L

12

U801

100n

Q4

4

Q3

3

Q2

2

Q1

1

Q0

15

GND

8

EN_OE

13

CLK_S

11

VCC

16

SEROUT9SERIN

14

RESET

10

Q7

7

Q6

6

Q5

5

MC74HC595A

C827

100n 10.K

R829

Q803

20.0

VR802

VR801

20.0

20.0

HSMG-C670

14

J803-14

D805

10K

47K

47K

10K

47K

10K

47K

10K

47K

10K

47K

10K

47K

73B02964C39-O

10K

Control Head CM200 Schematic

Control Head CM200 - PCB 8488998U01 / Schematics 4-5

2.1 Control Head PCB 8488998U01 Parts
List

Circuit

Ref

Motorola

Part No

Description

C802 2113740F59 CAP CHIP REEL CL13
C804 2113740F59 CAP CHIP REEL CL13
C805 2113740F59 CAP CHIP REEL CL13
C806 2113740F59 CAP CHIP REEL CL13
C808 2113740F59 CAP CHIP REEL CL13
C809 2113740F59 CAP CHIP REEL CL13
C810 2113740F59 CAP CHIP REEL CL13
C811 2113740F59 CAP CHIP REEL CL13
C812 2113740F59 CAP CHIP REEL CL13
C813 2113740F59 CAP CHIP REEL CL13
C814 2113740F59 CAP CHIP REEL CL13
C816 2113740F59 CAP CHIP REEL CL13
C817 2113740F59 CAP CHIP REEL CL13
C818 2113740F59 CAP CHIP REEL CL13
C819 2113740F59 CAP CHIP REEL CL13
C820 2113740F59 CAP CHIP REEL CL13
C822 2113740F59 CAP CHIP REEL CL13
C823 2113743K15 CER CHIP CAP .100uF
C824 2113740F59 CAP CHIP REEL CL13
C825 2113743K15 CER CHIP CAP .100uF
C826 2113740F59 CAP CHIP REEL CL13
C827 2113743K15 CER CHIP CAP .100uF
C832 2113743K15 CER CHIP CAP .100uF
C833 2113743K15 CER CHIP CAP .100uF
C834 2113743E07 CER CHIP CAP .022uF
C836 2113740F59 CAP CHIP REEL CL13
D801 4805729G74 LED SMT RED HP
D802 4805729G73 LED SMT YEL HP
D803 4805729G75 LED SMT GREEN HP
D804 4805729G75 LED SMT GREEN HP
D805 4805729G75 LED SMT GREEN HP
D806 4805729G75 LED SMT GREEN HP
DS801 5180353L02 7-SEGMENT DISPLAY
J802 0908353Y02 MODULAR 8-PIN STR
J803 0989241U02 FLEX 20-PIN 1mmTOP NON

M801 7588823L03 PAD GROUNFD LCD
M802 7588823L03 PAD GROUNFD LCD
M803 7588823L03 PAD GROUNFD LCD
M804 7588823L03 PAD GROUNFD LCD
P801 2809926G01 CONN 1.25MM 2PIN SURMT
Q801 4809940E02 TSTR NPN DIG DTC114YE
Q802 4813824A10 TSTR NPN 40V .2A GEN P
Q803 4809940E02 TSTR NPN DIG DTC114YE
Q804 4809940E02 TSTR NPN DIG DTC114YE
Q805 4809940E02 TSTR NPN DIG DTC114YE
Q806 4809940E02 TSTR NPN DIG DTC114YE
Q811 4809940E02 TSTR NPN DIG DTC114YE
Q812 4809940E02 TSTR NPN DIG DTC114YE
R801 0662057A01 CHIP RES 10 OHMS 5%
R802 0662057A61 CHIP RES 330 OHMS 5%
R803 0662057A89 CHIP RES 47K OHMS 5%
R804 0662057A89 CHIP RES 47K OHMS 5%
R805 0662057A73 CHIP RES 10K OHMS 5%
R806 0662057A89 CHIP RES 47K OHMS 5%
R807 0662057A73 CHIP RES 10K OHMS 5%
R808 0662057A36 CHIP RES 300 OHMS 5%
R809 0662057A45 CHIP RES 680 OHMS 5%
R810 0662057B47 CHIP RES 0 OHMS +0.5
R811 0662057B47 CHIP RES 0 OHMS +0.5
R813 0662057D08 CHIP RES 22K OHMS 5%
R816 0662057D03 CHIP RES 13K OHMS 5%
R818 0662057A63 CHIP RES 3900 OHMS 5%
R819 0662057A45 CHIP RES 680 OHMS 5%
R820 0662057A45 CHIP RES 680 OHMS 5%
R821 0662057A13 CHIP RES 33 OHMS 5%
R822 0662057A13 CHIP RES 33 OHMS 5%
R823 0662057A13 CHIP RES 33 OHMS 5%
R824 0662057A13 CHIP RES 33 OHMS 5%
R825 0662057A13 CHIP RES 33 OHMS 5%
R826 0662057A13 CHIP RES 33 OHMS 5%
R827 0662057A13 CHIP RES 33 OHMS 5%
R829 0662057A73 CHIP RES 10K OHMS 5%

Circuit

Ref

Motorola

Part No

Description

R830 0662057A41 CHIP RES 470 OHMS 5%
R841 0662057A73 CHIP RES 10K OHMS 5%
R842 0662057A73 CHIP RES 10K OHMS 5%
R843 0662057A73 CHIP RES 10K OHMS 5%
R844 0662057A73 CHIP RES 10K OHMS 5%
R845 0662057A90 CHIP RES 51K OHMS 5%
R846 0662057A90 CHIP RES 51K OHMS 5%
R849 0662057D03 CHIP RES 13K OHMS 5%

Circuit

Ref

Motorola

Part No

Description

4-6 Control Head CM300/PM400 - PCB 8489714U01 / Schematics

3.0 Control Head CM300/PM400 - PCB 8489714U01 / Schematics

C40

4

3

2

1

Q12

R19

R26

R27

R20

R24

1

4

58

U1

C11

C26

Q11

C17

R18

C35 C36

2

P101

C19

C23

1

4

58

U18

C21

C22

R11

M4

12

24

37

48

U3

M3

R28

R39

R6R7R8

R9

C18

C30

C32

C33

R30

C16

C20

C25 R10

R15

C39

R29

R51

7

8

14

U2

1

J103

C4

C8

C27

C38

C44

C45

C46

C47

C48

C49

C50

C51

C52

C53

C54

C55

C24

R13

R25

R44

R45

R46

R21

R22

R23

Q8 Q9

Q10

16

1

8

9

U8

C7

C15

R14

R40

C1

C14

C58

R16

R17

R31

R54

R3

C56

M2

Q41

R41

16

1

8

9

U41

C2

C3

C5

C29

C34

C42

R42

R43

C6

VR1VR2 VR3 VR4

C43

Q13

Q14

R33

R37

R38

M1

C41

R12

R34

R35

R36

R48

R49

R50

8756321

4

9

J102

1

S6

D2

1

S5

D4

1

S3

D26

1

S4

D9

1

S1

D20

1

S2

D10

D18

D19

D3

D14

D17

D24

D27

D5

D8

D11

D15

D16

D21

DS1

D12

D13

D22

D23

D25

Control Head CM300/PM400 PCB 8489714U01

Top Si de

Bottom Side

Control Head CM300/PM400 - PCB 8489714U01 / Schematics 4-7

10K

47K

10K

47K

10K

47K

10K

47K

10K

47K

10K

47K

9.3 V

F1

+

F2

MIC. AUDIO

MIC. PTT

KEY_ROW

KEY_COL

SPI_CLK

-

SPEAKER CONNECTOR

HOOK

MICROPHONE CONNECTOR

MAIN BOARD CONNECTOR

ESD CONTACTS

DIS_RES

DISP_CS
COM/DATA_SE

L

SH_R_CS

BOOT_RES

BOOT_RES

SCI
MIC. PTT

SPKR+

SPKR-

UP

DOWN

SPI_MOSI

HOOK

RX. AUDIO

SCI

SPKR+
SPKR-

MIC. AUDIO

F4 F3

RX. AUDIO

0.1uF

C22

Y1C

ZA

14

ZB

15

ZC

4

C23
1000pF

VDD

16

VEE7VSS

8

YOA

12

Y0B

2

Y0C

5

13

Y1A

Y1B

1

3

U41

HEF4053B

EN

6

11

SA

SB

10

9

SC

R13
51K

D12

HSMG-C670

D3_3V

19

HSMG-C670

D10

J102-88

J103-19

10

J102-77

C43

J103-10

470pF

C54

0.1uF

R36

47K

HSMG-C670

9_3V

R28

D25

P101-22

680K

51K

R12

R27
10

R7
10K

HSMG-C670

D17

DNF

C55C6

6

10K

R34

S2

C11C2

2

C33C4

4

D23

HSMG-C670

TOUCH_SW
DNF

D14

HSMG-C670

0

R9

MC74HCT04A

U2-6

13 12

12

DNF

C4
1000pF

4

C4

5C56

C6

DNF

TOUCH_SW

S6

TOUCH_SW

S3

1C12

C2

3

C3

10K

R8

DNF

U2-5

MC74HCT04A

11 10

DNF

HSMG-C670

D8

C29

DNF

1000pF

8

DNF

0

R10

U2-4

MC74HCT04A

9

680

DNF

R20
10K

6

C6

9_3V

R23

1

C1 C2

2

3C34

C4

5

C5

D2

HSMG-C670

TOUCH_SW
DNF

S1

1K

R18

10K

R15

100pF
DNF

DNF

J103-1313

C33

220pF

C53

DNF

C35

M3

6

D3_3V

DNF

1000pF

C30

9_3V

J102-6

DNF

100pF

D19

HSMH-C670

12

5V_IN

DNF

C20

2.2uF

Q41

J103-12

2.2uF

MC74HCT04A

U2-2

34

C19

J103-1111

9_3V

HSMG-C670

D9

DNF

1000pF

C27

D18

HSMY-C670

DNF

1000pF

C41

4

47K

R38

2

3

1

8

4

9_3V

J102-4

4

V3

5

VDD

7

VREG

16

VSS

6

U1-1

LM2904

SEG421SEG522SEG623SEG724SEG8

25

26

SEG9

9

SI

V1

3

V2

42

43

SEG26

SEG2744SEG2845SEG29

46

SEG3

20

SEG30

47

48

SEG31

35

SEG19

36

SEG2

19

SEG2037SEG2138SEG2239SEG2340SEG2441SEG25

SEG1028SEG11

SEG1229SEG1330SEG1431SEG1532SEG1633SEG1734SEG18

COM2

14

COM3

15

CS10C_D

11

OSC11OSC2

2

SEG017SEG1

18

27

S1D15100

U3

CK

8

COM0

12

COM1

13

20V

VR3

VR2
20V

VR1

10uF

C1

DNF

20V

Q5

5

Q6

6

Q7

7

RESET

10

SERIN14SEROUT

9

VCC

16

CLK_S

11

EN_OE

13

GND

8

Q0

15

Q1

1

Q2

2
3

Q3
Q4

4

U8

MC74HC595A

CLK_L

12

DNF

22K

R46

R44

R45
0

J102-55

DNF

20K

3

J103-21G1

R54

13K

J102-3

10K

R39

220pF
DNF

C55

J103-1818

DNF

10K

R6

R29

22K

DNF

C47
220pF

47K

R37

R30
10K
DNF

3

J103-88

130K

J103-3

D4

HSMG-C670

R11

M2 M4

220pF

C46

220pF
DNF

DNF

9_3V

C45

D16

HSMG-C670

R35

D24

HSMG-C670

0

R43

3.3K

R41

DNF

DNF

S5

TOUCH_SW

21

10K

J103-1515

D3_3V

9_3V

1000pF

C24

Q8

9_3V

C32

D3_3V

D3_3V

5V_CH

DNF

100pF

0.1uF

5

7

8

4

9_3V 9_3V

9_3V

DNF

C14

U1-2

LM2904

6

C17

5V_CH

M1

J103-44

DNF

1000pF

1

J103-66

Q9

J103-1

C5

R50
22K

470pF

0

R49

DNF

R48
20K

R42
0

DNF

C48

DNF

DNF

C50

9_3V

220pF

J103-55

470pF

R33
10K

0.1uF

C56

MC74HCT04A

U2-3

56

HSMG-C670

D15

Q10

10K

R19

5V_CH

C3
470pF

9

_3V

470pF

43K

R51

C2

C18

HSMG-C670

D21

PWR_GND

U2-7

GND

7

VCC

14

0.1uF

J103-99

C36
1000pF

R40

DNF

220pF

C44

DNF

10K

C33C4

4

C55C6

6

9_3V

DNF

S4
TOUCH_SW

C11C2

2

C16

0.1uF

DNF

J103-1717

J103-77

1000pF

C42

1000pF
DNF

C38

3.9K

R24

R21

C25

5V_IN

2.2K

DNF

1000pF

Q12

J102-11

Q13

J103-2020

Q14

R16

27K

HSMG-C670

D5

HSMG-C670

D13

0

R25

9_3V

9_3V

VR4
20V

470pF

C49

R31

13K

DNF

4.7uF

C21

DNF

C51
220pF

D20

HSMG-C670

R17

13K

D27

HSMG-C670HSMG-C670

D26

1000pF

C34

DNF

SEG813SEG9

14

680

R22

SEG29

34

SEG3

8

SEG3035SEG31

36

SEG49SEG510SEG611SEG7

12

SEG2126SEG2227SEG2328SEG2429SEG25

30

31

SEG26

SEG2732SEG28

33

SEG1419SEG1520SEG1621SEG1722SEG1823SEG19

24

SEG2

7

SEG20

25

COM2

3

COM3

4

SEG05SEG1

6

SEG1015SEG1116SEG1217SEG13

18

DNF

LCD_36PIN

DS1

COM0

1

COM1

2

R14
10K

0.1uF

C15

D3_3V

C7

1000pF

16

J102-22

1000pF

C39

J103-16

Q11

DNF

0.1uF

C11

12

1

J103-22G2

U2-1

MC74HCT04A

C40

P101-1

J103-22

DNF

1000pF

J103-1414

9_3V

HSMG-C670

D3

C8
1000pF

9_3V

HSMG-C670

D22

SHUTDOWN

3

1000pF

C6

DNF

LP2951C

5V_TAP

6

5

ERRORFEEDBACK

7

GND

4

INPUT8OUTPUT

1

SENSE

2

9_3V

DNF

U18

HSMG-C670

D11

C26
1000pF

C58
.022uF

10

470pF

C52

R3

SI

CS

MUX_CTL

ROW

COL

10

R26

TELCO_PTT

CS

CK

MUX_CTL

CH_PTT

CH_PTT

TELCO_PTT

CK

SI

Control Head CM300/PM400 Schemati

c

4-8 Control Head CM300/PM400 - PCB 8489714U01 / Schematics

3.1 Control Head PCB 8489714U01 Parts List
Circuit

Ref

Motorola

Part No

Description

C1 NOTPLACED CAP, 10uF
C2 2113740F67 CAP, 470pF
C3 2113740F67 CAP, 470pF
C4 2113740F29 CAP, 12pF
C5 2113740F67 CAP, 470pF
C6 2113740F29 CAP, 12pF
C7 2113741F25 CAP, 1000pF
C8 2113741F25 CAP, 1000pF
C11 2113743K15 CAP, 0.1uF
C14 NOTPLACED CAP, 0.1uF
C15 2113743K15 CAP, 0.1uF
C16 2113743K15 CAP, 0.1uF
C17 NOTPLACED CAP, 1000pF
C18 2113743K15 CAP, 0.1uF
C19 2113743F18 CAP, 2.2uF
C20 NOTPLACED CAP, 2.2uF
C21 NOTPLACED CAPP, 4.7uF
C22 2113743K15 CAP, 0.1uF
C23 2113741F25 CAP, 1000pF
C24 2113741F25 CAP, 1000pF
C25 NOTPLACED CAP, 1000pF
C26 2113741F25 CAP, 1000pF
C27 2113740F29 CAP, 12pF
C29 2113740F29 CAP, 12pF
C30 NOTPLACED CAP, 100pF
C32 NOTPLACED CAP, 100pF
C33 NOTPLACED CAP, 100pF
C34 2113740F29 CAP, 12pF
C35 NOTPLACED CAP, 1000pF
C36 NOTPLACED CAP, 1000pF
C38 NOTPLACED CAP, 1000pF
C39 NOTPLACED CAP, 1000pF
C40 NOTPLACED CAP, 1000pF
C41 NOTPLACED CAP, 1000pF
C42 2113740F29 CAP, 12pF
C43 2113743K15 CAP, 0.1uF
C44 NOTPLACED CAP, 220pF
C45 NOTPLACED CAP, 220pF

C46 NOTPLACED CAP, 220pF
C47 NOTPLACED CAP, 220pF
C48 NOTPLACED CAP, 220pF
C49 2113740F67 CAP, 470pF
C50 2113740F67 CAP, 470pF
C51 2113740F29 CAP, 12pF
C52 2113740F67 CAP, 470pF
C53 2113740F29 CAP, 12pF
C54 2113740F67 CAP, 470pF
C55 NOTPLACED CAP, 220pF
C56 2113743K15 CAP, 0.1uF
C58 2113743E07 CAP, .022uF
D2 4805729G75 HSMG-C670
D3 4805729G75 HSMG-C670
D4 4805729G75 HSMG-C670
D5 4805729G75 HSMG-C670
D8 4805729G75 HSMG-C670
D9 4805729G75 HSMG-C670
D10 4805729G75 HSMG-C670
D11 4805729G75 HSMG-C670
D12 4805729G75 HSMG-C670
D13 4805729G75 HSMG-C670
D14 4805729G75 HSMG-C670
D15 4805729G75 HSMG-C670
D16 4805729G75 HSMG-C670
D17 4805729G75 HSMG-C670
D18 4805729G73 HSMY-C670
D19 4805729G74 HSMH-C670
D20 4805729G75 HSMG-C670
D21 4805729G75 HSMG-C670
D22 4805729G75 HSMG-C670
D23 4805729G75 HSMG-C670
D24 4805729G75 HSMG-C670
D25 4805729G75 HSMG-C670
D26 4805729G75 HSMG-C670
D27 4805729G75 HSMG-C670
DS1 NOTPLACED LCD_36PIN
J102 0908353Y02 CONN_J
J103 0989241U02 CONN_J

Circuit

Ref

Motorola

Part No

Description

M1 7588823L03 CONTACT
M2 7588823L03 CONTACT
M3 7588823L03 CONTACT
M4 7588823L03 CONTACT
P101 2809926G01 CONN_P
Q8 4809940E02 DTC114YE
Q9 4809940E02 DTC114YE
Q10 4809940E02 DTC114YE
Q11 4809940E02 D TC114YE
Q12 4813824B01 PZT2222A
Q13 4809940E02 D TC114YE
Q14 4813824A10 MMBT3904
Q41 4809940E02 D TC114YE
R3 0662057A01 RES, 10
R6 NOTPLACED RES, 10K
R7 NOTPLACED RES, 10K
R8 NOTPLACED RES, 10K
R9 0662057B47 RES, 0
R10 NOTPLACED RES, 0
R11 0662057B01 RES, 130K
R12 0662057A90 RES, 51K
R13 0662057A90 RES, 51K
R14 0662057A73 RES, 10K
R15 NOTPLACED RES, 10K
R16 0662057A83 RES, 27K
R17 0662057A76 RES, 13K
R18 0662057A49 RES, 1K
R19 0662057A73 RES, 10K
R20 NOTPLACED RES, 10K
R21 0662057A63 RES, 3.9K
R22 0662057A45 RES, 680
R23 0662057A45 RES, 680
R24 0662057A57 RES, 2.2K
R25 0662057B47 RES, 0
R26 0662057A01 RES, 10
R27 0662057A01 RES, 10
R28 0662057B18 RES, 680K
R29 0662057A81 RES, 22K
R30 NOTPLACED RES, 10K

Circuit

Ref

Motorola

Part No

Description

R31 0662057A76 RES, 13K
R33 0662057A73 RES, 10K
R34 0662057A73 RES, 10K
R35 0662057A61 RES, 3.3K
R36 0662057A89 RES, 47K
R37 0662057A89 RES, 47K
R38 0662057A89 RES, 47K
R39 0662057A73 RES, 10K
R40 0662057A73 RES, 10K
R41 0662057A73 RES, 10K
R42 NOTPLACED RES, 0
R43 NOTPLACED RES, 0
R44 NOTPLACED RES, 20K
R45 0662057B47 RES, 0
R46 NOTPLACED RES, 22K
R48 NOTPLACED RES, 20K
R49 0662057B47 RES, 0
R50 NOTPLACED RES, 22K
R51 0662057A88 RES, 43K
R54 0662057A76 RES, 13K
S1 NOTPLACED TOUCH_SW
S2 NOTPLACED TOUCH_SW
S3 NOTPLACED TOUCH_SW
S4 NOTPLACED TOUCH_SW
S5 NOTPLACED TOUCH_SW
S6 NOTPLACED TOUCH_SW
U1 5113818A01 LM2904
U2 5113805A05 MC74HCT04A
U3 5102109U01 S1D15100
U8 5113805A75 MC74HC595A
U18 NOTPLACED LP2951C
U41 5184704M60 HEF4053B
VR1 4813830A75 MMBZ20VAL
VR2 4813830A75 MMBZ20VAL
VR3 4813830A75 MMBZ20VAL
VR4 4813830A75 MMBZ20VAL

Circuit

Ref

Motorola

Part No

Description

M

CM200/CM300/PM400

Radios

UHF2 (438-470 MHz) 1-25 W

Service Information

Issue: November, 2007

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 MODEL CHART AND TECHNICAL SPECIFICATIONS

1.0 CM200/CM300/PM400 Model Chart....................................................................1-1

2.0 Technical Specifications ......................................................................................1-2

Chapter 2 THEORY OF OPERATION

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

2.0 UHF (438-470 MHz) Receiver .............................................................................2-1

2.1 Receiver Front-End......................................................................................2-1

2.2 Receiver Back End ......................................................................................2-2

3.0 UHF Transmitter Power Amplifier (438-470 MHz) ...............................................2-2

3.1 First Power Controller Stage........................................................................2-2

3.2 Power Controlled Driver Stage ....................................................................2-3

3.3 Final Stage...................................................................................................2-3

3.4 Directional Coupler ......................................................................................2-3

3.5 Antenna Switch............................................................................................2-3

3.6 Harmonic Filter ............................................................................................2-4

3.7 Power Control ..............................................................................................2-4

4.0 UHF (438-470 MHz) Frequency Synthesis..........................................................2-4

4.1 Reference Oscillator ....................................................................................2-4

4.2 Fractional-N Synthesizer .............................................................................2-5

4.3 Voltage Controlled Oscillator (VCO) ............................................................2-6

4.4 Synthesizer Operation .................................................................................2-7

5.0 Controller Theory of Operation ............................................................................2-8

5.1 Radio Power Distribution .............................................................................2-8

5.2 Protection Devices.....................................................................................2-10

5.3 Automatic On/Off .......................................................................................2-10

5.4 Microprocessor Clock Synthesiser ............................................................2-11

5.5 Serial Peripheral Interface (SPI) ................................................................2-12

5.6 SBEP Serial Interface ................................................................................2-12

5.7 General Purpose Input/Output...................................................................2-12

5.8 Normal Microprocessor Operation.............................................................2-13

5.9 Static Random Access Memory (SRAM)...................................................2-14

6.0 Control Board Audio and Signalling Circuits ......................................................2-14

6.1 Audio Signalling Filter IC and Compander (ASFIC CMP)..........................2-14

7.0 Transmit Audio Circuits......................................................................................2-15

7.1 Microphone Input Path...............................................................................2-15

7.2 PTT Sensing and TX Audio Processing ....................................................2-16

8.0 Transmit Signalling Circuits ...............................................................................2-17

8.1 Sub-Audio Data (PL/DPL)..........................................................................2-17

8.2 High Speed Data .......................................................................................2-18

iii

iv

8.3 Dual Tone Multiple Frequency (DTMF) Data.............................................2-18

9.0 Receive Audio Circuits.......................................................................................2-19

9.1 Squelch Detect ..........................................................................................2-19

9.2 Audio Processing and Digital Volume Control...........................................2-20

9.3 Audio Amplification Speaker (+) Speaker (-) ............................................. 2-20

9.4 Handset Audio ...........................................................................................2-21

9.5 Filtered Audio and Flat Audio ....................................................................2-21

10.0 Receive Signalling Circuits ................................................................................2-21

10.1 Sub-Audio Data (PL/DPL) and High Speed Data Decoder........................ 2-21

10.2 Alert Tone Circuits .....................................................................................2-22

Chapter 3 TROUBLESHOOTING CHARTS

1.0 Troubleshooting Flow Chart for Receiver RF (Sheet 1 of 2)................................ 3-2

1.1 Troubleshooting Flow Chart for Receiver (Sheet 2 of 2) .............................3-3

2.0 Troubleshooting Flow TX RF (No Output Power) ................................................3-4

2.1 Troubleshooting Flow TX RF (No Output Power/No Current) .....................3-5

2.2 Troubleshooting Flow TX RF (Not Txing at Nominal power) ....................... 3-6

3.0 Troubleshooting Flow Chart for Synthesizer........................................................3-7

4.0 Troubleshooting Flow Chart for VCO...................................................................3-8

5.0 Troubleshooting Flow Chart for DC Supply (1 of 2).............................................3-9

5.1 Troubleshooting Flow Chart for DC Supply (2 of 2)...................................3-10

Chapter 4 UHF2 PCB/ SCHEMATICS/ PARTS LISTS

1.0 Allocation of Schematics and Circuit Boards .......................................................4-1

1.1 UHF2 and Controller Circuits.......................................................................4-1

2.0 UHF 1-25 W Band 2 PCB 8488978U01 (rev. P9) / Schematics ..........................4-3

UHF2 Interconnection between Main Board and

Power Amplifier Compartment ............................................................................4-3

UHF2 (438-470 MHz) 1-25 W 8488978U01 (rev. P9), Top Side ........................4-4

UHF2 (438-470 MHz) 1-25 W 8488978U01 (rev. P9), Bottom Side ...................4-5

UHF2 (438-470 MHz) 1-25 W Main Circuit (Sht 1 of 2) ......................................4-6

UHF2 (438-470 MHz) 1-25 W Main Circuit (Sht 2 of 2) ......................................4-7

UHF2 (438-470 MHz) 1-25 W Transmitter (Sht 1 of 2) ....................................... 4-8

UHF2 (438-470 MHz) 1-25 W Transmitter (Sht 2 of 2) ....................................... 4-9

UHF2 (438-470 MHz) 1-25 W Synthesiser and VCO (Sht 1 of 2) ....................4-10

UHF2 (438-470 MHz) 1-25 W Synthesiser and VCO (Sht 2 of 2) ....................4-11

UHF2 (438-470 MHz) 1-25 W Receiver Front and Back End (Sht 1 of 2) ........4-12

UHF2 (438-470 MHz) 1-25 W Receiver Front and Back End (Sht 2 of 2) ........4-13

UHF2 (438-470 MHz) 1-25 W DC and Audio Circuits (Sht 1 of 2) .................... 4-14

UHF2 (438-470 MHz) 1-25 W DC and Audio Circuits (Sht 2 of 2) .................... 4-15

UHF2 (438-470 MHz) 1-25 W Microprocessor and

Controller Circuits (Sht 1 of 2) ..........................................................................4-16

UHF2 (438-470 MHz) 1-25 W Microprocessor and

Controller Circuits (Sht 2 of 2) ..........................................................................4-17

UHF2 (438-470 MHz) 1-25 W Power Control Circuit ........................................4-18

2.1 UHF2 PCB 8488978U01 (rev. P9) Parts List 1-25 W ................................4-19

3.0 UHF 1-25 W Band 2 PCB 8486684Z02 (Rev. A) / Schematics .........................4-30

UHF2 Interconnection between Main Board and

Power Amplifier Compartment ..........................................................................4-30

UHF2 (438-470 MHz) 1-25 W 848668Z02 (Rev. A), Top Side .........................4-31

UHF2 (438-470 MHz) 1-25 W 848668Z02 (Rev. A) , Bottom Side ..................4-32

UHF2 (438-470 MHz) 1-25 W Main Circuit (Sht 1 of 2) ....................................4-33

UHF2 (438-470 MHz) 1-25 W Main Circuit (Sht 2 of 2) ....................................4-34

UHF2 (438-470 MHz) 1-25 W Transmitter (Sht 1 of 2) .....................................4-35

UHF2 (438-470 MHz) 1-25 W Transmitter (Sht 2 of 2) .....................................4-36

UHF2 (438-470 MHz) 1-25 W Synthesiser and VCO (Sht 1 of 2) .....................4-37

UHF2 (438-470 MHz) 1-25 W Synthesiser and VCO (Sht 2 of 2) .....................4-38

UHF2 (438-470 MHz) 1-25 W Receiver Front and Back End (Sht 1 of 2) ........4-39

UHF2 (438-470 MHz) 1-25 W Receiver Front and Back End (Sht 2 of 2) ........4-40

UHF2 (438-470 MHz) 1-25 W DC and Audio Circuits (Sht 1 of 2) ....................4-41

UHF2 (438-470 MHz) 1-25 W DC and Audio Circuits (Sht 2 of 2) ....................4-42

UHF2 (438-470 MHz) 1-25 W Microprocessor and

Controller Circuits (Sht 1 of 2) ...........................................................................4-43

UHF2 (438-470 MHz) 1-25 W Microprocessor and

Controller Circuits (Sht 2 of 2) ...........................................................................4-44

UHF2 (438-470 MHz) 1-25 W Power Control Circuit ........................................4-45

3.1 UHF2 PCB 8486684Z02 (Rev. A) Parts List 1-25 W .................................4-46

v

vi

Notes

MODEL CHART AND TECHNICAL SPECIFICATIONS

1.0 CM200/CM300/PM400 Model Chart

UHF2, 1-25 W, 438-470 MHz

Model Description

AAM50RNC9AA1A CM200 438-470 MHz, 1-25 W, 4 CH

AAM50RNF9AA1AN CM300 438-470 MHz, 1-25 W, 32 CH

AAM50RNF9AA3AN PM400 438-470 MHz, 1-25 W, 64 CH

Item Description

X PMUE1996_ CM200 Super Tanapa UHF2, 1-25 W, 4 CH

X PMUE1998_ CM300 Super Tanapa UHF2, 1-25 W, 32 CH

X PMUE2090_ PM400 Super Tanapa UHF2, 1-25 W, 64 CH

X FLE1620_ CM200 Tanapa UHF2, 1-25 W, 4 CH

X PMUE2026_ CM300 Tanapa UHF2, 1-25 W, 32 CH

X PMUE2026_ PM400 Tanapa UHF2, 1-25 W, 64 CH

X PMLN4598_ Control Head

X PMLN4599_ Control Head

X FLN3108_AN Control Head

X FLE1620_S CM200 UHF2 Service Board

X PMUE2026_S CM300 UHF2 Service Board

X PMUE2026_S PM400 UHF2 Service Board

X 6902966C30 CM200 User Guide (bilingual)

X 6881096C22 CM300 User Guide (bilingual)

X 6881096C32 PM400 User Guide (bilingual)

X X HKLN4220 CM200/CM300 User Guide CDROM (bilingual)

X HKLN4219 PM400 User Guide CDROM (blilingual)

x = Indicates one of each is required.

Chapter 1

1-2 MODEL CHART AND TECHNICAL SPECIFICATIONS

2.0 Technical Specifications

Data is specified for +25°C unless otherwise stated.

General

Specification UHF2

Frequency Range: 438-470 MHz

Frequency Stability
(-30°C to +60°C, 25°C Ref.)

Channel Capacity: CM200 - 4

Channel Spacing: 12.5/20/25 kHz

Power Supply: 13.8 Vdc (11 Vdc - 16.6 Vdc) negative Vehicle

Dimensions (L x W x H)

Weight 2.25 lbs (1.01 kg)

FCC Description AZ492FT4856

Operating Temperature -30 to 60° C (Display only -20°C to 60°C)

Storage Temperature -40 to 85° C

Thermal Shock -40 to 80° C

High Humidity 95% RH @ 50° C for 8 hrs

ESD 15KV air discharge

(118mm X 169.5mm X 44mm)

±2.5 PPM

CM300 - 32
PM400 - 64

ground

4.65” X 6.67” X 1.73”

Packing Test Impact Test

Technical Specifications 1-3

Transmitter

Specification UHF2

Power Output 1-25W

Conducted/Radiated
Emissions:

Audio Response: (from 6 dB/
oct. Pre-Emphasis, 300 to
3000Hz)

Tx Audio Distortion < 3%

Modulation Limiting: ±2.5 kHz @ 12.5 kHz

FM Hum and Noise: -35 dB@12.5 kHz

-36 dBm < 1 GHz

-30 dBm > 1 GHz

TIA603 and CEPT

±4.0 kHz @ 20 kHz
±5.0 kHz @ 25 kHz

-40 dB@25 kHz

Receiver

Specification UHF2

Sensitivity (12 dB SINAD): 0.35 μV @ 12.5 kHz

0.3 μV @ 25 kHz

Intermodulation: 60 dB@12.5 kHz

70 dB@25 kHz

Adjacent Channel Selectivity: 60 dB @ 12.5 kHz

70 dB @ 25 kHz

Spurious Response 70 dB

Rated Audio Power 4 W (typ.) Internal

7.5 W @ 5 % External

Audio Distortion < 5 %

Hum and Noise: -35 dB @ 12.5 kHz

-40 dB @ 25 kHz

Audio Response TIA603 and CEPT

Conducted Spurious Emission
per FCC Part 15:

Specifications subject to change without notice. All electrical specifications and methods
refer to EIA/TIA 603 standards.

*Availability subject to the laws and regulations of individual countries.

-57 dBm <1 Ghz

-47 dBm >1 Ghz

1-4 MODEL CHART AND TECHNICAL SPECIFICATIONS

Notes

1.0 Introduction

This Chapter provides a detailed theory of operation for the UHF circuits in the radio. Details of the
theory of operation and trouble shooting for the the associated Controller circuits are included in this
Section of the manual.

2.0 UHF (438-470 MHz) Receiver

2.1 Receiver Front-End

The received signal is applied to the radio’s antenna input connector and routed through the
harmonic filter and antenna switch. The insertion loss of the harmonic filter/antenna switch is less
than 1 dB. The signal is routed to the first filter (4-pole), which has an insertion loss of 2 dB typically.
The output of the filter is matched to the base of the LNA (Q303) that provides a 16 dB gain and a
noise figure of better than 2 dB. Current source Q301 is used to maintain the collector current of
Q303. Diode CR301 protects Q303 by clamping excessive input signals. Q303 output is applied to
the second filter (3-pole) which has an insertion loss of 1.5 dB. In Distance mode, Q304 turns on and
causes D305 to conduct, thus bypassing C322 and R337. In Local mode, the signal is routed
through C322 and R337, thus inserting 7 dB attenuation. Since the attenuator is located after the RF
amplifier, the receiver sensitivity is reduced only by 6 dB, while the overall third order input intercept
is raised.

Chapter 2

THEORY OF OPERATION

Antenna

Front Filter

The first mixer is a passive, double-balanced type, consisting of T300, T301 and U302. This mixer
provides all of the necessary rejection of the half-IF spurious response. Low-side injection at
+15 dBm is delivered to the first mixer. The mixer output is then connected to a duplex network
which matches its output to the XTAL filter input (FL300) at the IF frequency of 44.85 MHz. The
duplex network terminates into a 50 ohm resistor (R340) at all other frequencies.

LNA

Second Filter

First LO

Figure 2-1 UHF Receiver Block Diagram

Mixer

4- Pole

Xtal Filter

2nd LO Xtal Osc

12.5 kHzFilter

IF Amp

25 kHzFilter

12.5 kHzFilter

25 kHzFilter

IFIC

Phase Shift

Element

Controller

2-2 THEORY OF OPERATION

2.2 Receiver Back End

The IF signal from the crystal filter enters the IF amplifier which provides 20 dB of gain and feeds
the IF IC at pin 1. The first IF signal at 44.85 MHz mixes with the second local oscillator (LO) at

44.395 MHz to produce the second IF at 455 kHz. The second LO uses the external crystal Y301.
The second IF signal is amplified and filtered by two external ceramic filters (FL303/FL302 for

12.5 kHz channel spacing and FL304/FL301 for 25 kHz channel spacing). The IF IC demodulates
the signal by means of a quadrature detector and feeds the detected audio (via pin 7) to the audio
processing circuits. At IF IC pin 5, an RSSI signal is available with a dynamic range of 70 dB.

3.0 UHF Transmitter Power Amplifier (438-470 MHz)

The radio’s 25W PA is a three-stage amplifier used to amplify the output from the VCOBIC to the
radio transmit level. All three stages utilize LDMOS technology. The gain of the first stage (U101) is
adjustable and controlled by pin 7 of U103-2 via U103-3. It is followed by an LDMOS stage Q105
and LDMOS final stage Q100.

From VCO

Controlled

Stage

PA

Driver

PA- Final

Stage

ASFIC_CMP

SPI BUS

Coupler

Bias

PA
PWR
SET

Loop
Controller
U103-2

Forward

Pin Diode
Antenna
Switch

Harmonic
Filter

Temperature

Sense

RF Jack

Figure 2-2 UHF Transmitter Block Diagram

Devices U101, Q105 and Q100 are surface mounted. A metal clip ensures good thermal contact
between both the driver and final stage, and the chassis.

Antenna

3.1 First Power Controller Stage

The first stage (U101) is a 20 dB gain integrated circuit containing two LDMOS FET amplifier
stages. It amplifies the RF signal from the VCO (TX_INJ). The output power of stage U101 is
controlled by a DC voltage applied to pin 1 from the op-amp U103-3, pin 8. The control voltage
simultaneously varies the bias of two FET stages within U101. This biasing point determines the
overall gain of U101 and therefore its output drive level to Q105, which in turn controls the output

UHF Transmitter Power Amplifier (438-470 MHz) 2-3

power of the PA.Op-amp U103-3 monitors the drain current of U101 via resistor R122 and adjusts
the bias voltage of U101.

In receive mode, the DC voltage from RX_EN line turns on Q101, which in turn switches off the
biasing voltage to U101.

3.2 Power Controlled Driver Stage

The next stage is an LDMOS device (Q105) which provides a gain of 12 dB. This device requires a
positive gate bias and a quiescent current flow for proper operation. The bias is set during transmit
mode by the drain current control op-amp U102-1, and fed to the gate of Q105 via the resistive
network R175, R147.

Op-amp U102-1 monitors the drain current of Q105 via resistors R126-8 and adjusts the bias
voltage of Q105.

In receive mode the DC voltage from RX_EN line turns on Q102, which in turn switches off the
biasing voltage to Q105.

3.3 Final Stage

The final stage is an LDMOS device (Q100) providing a gain of 12 dB. This device also requires a
positive gate bias and a quiescent current flow for proper operation. The voltage of the line PA_BIAS
is set in transmit mode by the ASFIC and fed to the gate of Q100 via the resistive network R134,
R131. This bias voltage is tuned in the factory. If the transistor is replaced, the bias voltage must be
tuned using the Tuner. Care must be taken not to damage the device by exceeding the maximum
allowed bias voltage. The device’s drain current is drawn directly from the radio’s DC supply voltage
input, B+, via L117 and L115.

A matching network consisting of C1004-5, C1008, C1021: and two striplines, transforms the
impedance to 50 ohms and feeds the directional coupler.

3.4 Directional Coupler

The directional Coupler is a microstrip printed circuit, which couples a small amount of the forward
power of the RF power from Q100.The coupled signal is rectified to an output power which is
proportional to the DC voltage rectified by diode D105; and the resulting DC voltage is routed to the
power control section to ensure that the forward power out of the radio is held to a constant value.

3.5 Antenna Switch

The antenna switch utilizes the existing dc feed (B+) to the last stage device (Q100). The basic
operation is to have both PIN diodes (D103, D104) turned on during key-up by forward biasing
them. This is achieved by pulling down the voltage at the cathode end of D104 to around 12.4 V (0.7
V drop across each diode). The current through the diodes needs to be set around 100 mA to fully
open the transmit path through resistor R108. Q106 is a current source controlled by Q103 which is
turned on in Tx mode by TX_EN. VR102 ensures that the voltage at resistor R107 never exceeds

5.6 V.

2-4 THEORY OF OPERATION

3.6 Harmonic Filter

Inductors L111 and L113 along with capacitors C1011, C1023, C1020 and C1016 form a low-pass
filter to attenuate harmonic energy coming from the transmitter. Resistor R150 along with L126
drains any electrostatic charges that might otherwise build up on the antenna. The harmonic filter
also prevents high level RF signals above the receiver passband from reaching the receiver circuits
to improve spurious response rejection.

3.7 Power Control

The output power is regulated by using a forward power detection control loop. A directional coupler
samples a portion of the forward and reflected RF power. The forward sampled RF is rectified by
diode D105, and the resulting DC voltage is routed to the operational amplifier U100. The error
output current is then routed to an integrator, and converted into the control voltage. This voltage
controls the bias of the pre-driver (U101 and driver (Q105) stages. The output power level is set by
way of a DAC, PWR_SET, in the audio processing IC (U504) which acts at the forward power
control loop reference.

The sampled reflected power is rectified by diode D107,The resulting DC voltage is amplified by an
operational amplifier U100 and routed to the summing junction. This detector protects the final stage
Q100 from reflected power by increasing the error current. The temperature sensor protects the
final stage Q100 from overheating by increasing the error current. A thermistor RT100 measures the
final stage Q100 temperature. The voltage divider output is routed to an operational amplifier U103
and then goes to the summing junction. The Zener Diode VR101 keeps the loop control voltage
below 5.6 V and eliminates the DC current from the 9.3 regulator U501.

Two local loops for the Pre Driver (U101) and for the Driver (Q105) are used in order to stabilize the
current for each stage.

In Rx mode, the two transistors Q101 and Q102 go to saturation and shut down the transmitter by
applying ground to the Pre Driver U101 and for the Driver Q105 control.

4.0 UHF (438-470 MHz) Frequency Synthesis

The synthesizer consists of a reference oscillator (Y201), low voltage Fractional-N (LVFRAC-N)
synthesizer (U200), and a voltage controlled oscillator (VCO) (U201).

4.1 Reference Oscillator

The reference oscillator is a crystal (Y201) controlled Colpitts oscillator and has a frequency of

16.8 MHz. The oscillator transistor and start-up circuit are located in the LVFRAC-N (U200) while
the oscillator feedback capacitors, crystal, and tuning varactors are external. An analog-to-digital (A/
D) converter internal to the LVFRAC-N (U200) and controlled by the microprocessor via SPI sets the
voltage at the warp output of U200 pin 25. This sets the frequency of the oscillator. Consequently,
the output of the crystal Y201 is applied to U200 pin 23.

The method of temperature compensation is to apply an inverse Bechmann voltage curve, which
matches the crystal’s Bechmann curve to a varactor that constantly shifts the oscillator back on
frequency. The crystal vendor characterizes the crystal over a specified temperature range and
codes this information into a bar code that is printed on the crystal package. In production, this
crystal code is read via a 2-dimensional bar code reader and the parameters are saved.

UHF (438-470 MHz) Frequency Synthesis 2-5

This oscillator is temperature compensated to an accuracy of +/-2.5 PPM from -30 to 60 degrees C.
The temperature compensation scheme is implemented by an algorithm that uses five crystal
parameters (four characterize the inverse Bechmann voltage curve and one for frequency accuracy
of the reference oscillator at 25 degrees C). This algorithm is implemented by the LVFRAC-N (U200)
at the power up of the radio.

TCXO Y200, along with its corresponding circuitry R204, R205, R210, and C2053, are not placed as
the temperature compensated crystal proved to be reliable.

4.2 Fractional-N Synthesizer

The LVFRAC-N U200 consists of a pre-scaler, programmable loop divider, control divider logic,
phase detector, charge pump, A/D converter for low frequency digital modulation, balanced
attenuator used to balance the high and low frequency analog modulation, 13 V positive voltage
multiplier, serial interface for control, and a super filter for the regulated 5 volts.

DATA (U403 PIN 100)

CLOCK (U403 PIN 1)

CSX (U403 PIN 2)

MOD IN (U501 PIN 40)

+5 V (U503 PIN 1)
+5 V (U503 PIN 1)

REFERENCE
OSCILLATOR

VOLTAGE

MULTIPLIER

10

13, 30

5, 20, 34, 36

23

24

25

32

47

7

DATA

8

CLK

9

CEX

MODIN

VCC, DC5V

VDD, DC5V

XTAL1

XTAL2
WARP

PREIN

VCP

VMULT2 VMULT1

14

U200

LOW VOLTAGE

FRACTIONAL-N

SYNTHESIZER

15

PRESCALER IN

FREFOUT

IADAPT

MODOUT

SFOUT

BIAS1

BIAS2

AUX1

48

LOCK

GND

IOUT

AUX4
AUX2
AUX3

4

19

6, 22, 33, 44

43
45

41
3
1 (NU)
2

28

40

39

BWSELECT

Figure 2-3 UHF Synthesizer Block Diagram

LOCK (U403 PIN 56)

FREF (U504 PIN 34)

LOOP

FILTER

VCO Bias

TRB

FILTERED 5V

To IF
Section

STEERING
LINE

LO RF INJECTION

VOLTAGE

CONTROLLED

OSCILLATOR

TX RF INJECTION
(1ST STAGE OF PA)

A voltage of 5 V applied to the super filter input (U200, pin 30) supplies an output voltage of 4.5 Vdc
(VSF) at U200, pin 28. This supplies 4.5 V to the VCO Buffer IC U201.

To generate a high voltage to supply the phase detector (charge pump) output stage at pin VCP
(U200, pin 47) while using a low voltage 3.3 Vdc supply, a 13 V positive voltage multiplier is used
(D200, D201, and capacitors C2024, 2025, 2026, 2055, 2027, 2001).

Output lock (U200, pin 4) provides information about the lock status of the synthesizer loop. A high
level at this output indicates a stable loop. A 16.8 MHz reference frequency is provided at U200, pin

19.

2-6 THEORY OF OPERATION

4.3 Voltage Controlled Oscillator (VCO)

The Voltage Controlled Oscillator (VCO) consists of the VCO/Buffer IC (VCOBIC, U201), the TX and
RX tank circuits, the external RX buffer stages, and the modulation circuitry.

AUX3 (U200 Pin 2)

Steer Line

Voltage
(VCTRL)

(U200 Pin 28)

RX Tank

TX Tank

Rx-SW

Tx-SW

RX VCO

Circuit

TX VCO
Circuit

Pin7

Pin13

Vcc-Superfilter

Pin3

Collector/RF in
Pin4

RX

Pin5

Pin6

TX

Pin16

Pin15

Pin18

Vcc-Logic

Pin 20

Vsens
Circuit

TRB IN

TX/RX/BS
Switching Network

U201

VCOBIC

Rx
Active Bias

Tx
Active Bias

Pin2

Rx-I adjust

Prescaler Out

Pin1
Tx-I adjust

Pin 12Pin 19

Presc

RX

Pin8

Pin14

TX

Pin10

Pins 9,11,17

U200 Pin 32

Q200

Buffers

VCC Buffers

TX RF Injection

LO RF INJECTION

Low Pass
Filter

(U200 Pin28)

Attenuator

(U200 Pin 28)

Figure 2-4 UHF VCO Block Diagram

The VCOBIC together with the LVFRAC-N (U200) generate the required frequencies in both
transmit and receive modes. The TRB line (U201, pin 19) determines which VCO and buffer is
enabled (high being TX output at pin 10, low being RX output at pin 8). A sample of the signal from
the enabled output is routed from U201, pin 12 (PRESC_OUT), via a low pass filter to U200, pin 32
(PREIN).

A steering line voltage between 3.0 V and 10.0 V at varactor D204 tunes the TX VCO through the
frequency range of 438-470 MHz, and at D203 tunes the RX VCO through the frequency range of

393.15-425.15 MHz.

The external RX amplifier is used to increase the output from U201, pin 9 from 3-4 dBm to the
required 15 dBm for proper mixer operation. In TX mode, the modulation signal from the LVFRAC-N
(U200, pin 41) is applied to the VCO by way of the modulation circuit D205, R212, R211, C2073.

UHF (438-470 MHz) Frequency Synthesis 2-7

4.4 Synthesizer Operation

The synthesizer consists of a low voltage FRAC-N IC (LVFRAC-N), reference oscillator, charge
pump circuits, loop filter circuit, and DC supply. The output signal (PRESC_OUT) of the VCOBIC
(U201, pin 12) is fed to the PREIN, pin 32 of U200 via a low pass filter which attenuates harmonics
and provides a correct input level to the LVFRAC-N in order to close the synthesizer loop.

The pre-scaler in the synthesizer (U200) is a dual modulus pre-scaler with selectable divider ratios.
The divider ratio of the pre-scaler is controlled by the loop divider, which in turn receives its inputs
via the SPI. The output of the pre-scaler is applied to the loop divider. The output of the loop divider
is connected to the phase detector, which compares the loop divider’s output signal with the
reference signal. The reference signal is generated by dividing down the signal of the reference
oscillator (Y201).

The output signal of the phase detector is a pulsed dc signal that is routed to the charge pump. The
charge pump outputs a current from U200, pin 43 (IOUT). The loop filter (consisting of R224, R217,
R234, C2074, C2075, C2077, C2078, C2079, C2080, C2028, and L205) transforms this current into
a voltage that is applied the varactor diodes D203 and D204 for RX and TX respectively. The output
frequency is determined by this control voltage. The current can be set to a value fixed in the
LVFRAC-N or to a value determined by the currents flowing into BIAS 1 (U200, pin 40) or BIAS 2
(U200, pin 39). The currents are set by the value of R200 or R206 respectively. The selection of the
three different bias sources is done by software programming.

To modulate the synthesizer loop, a two-spot modulation method is utilized via the MODIN (U200,
pin 10) input of the LVFRAC-N. The audio signal is applied to both the A/D converter (low frequency
path) and the balance attenuator (high frequency path). The A/D converter converts the low
frequency analog modulating signal into a digital code which is applied to the loop divider, thereby
causing the carrier to deviate. The balance attenuator is used to adjust the VCO’s deviation
sensitivity to high frequency modulating signals. The output of the balance attenuator is presented
at the MODOUT port of the LVFRAC-N (U200,pin 41) and connected to the VCO modulation
varactor D205.

2-8 THEORY OF OPERATION

5.0 Controller Theory of Operation

This section provides a detailed theory of operation for the radio and its components. The main
radio is a single-board design, consisting of the transmitter, receiver, and controller circuits. A
control head is connected by an extension cable. The control head contains LED indicators, a
microphone connector, buttons, and speaker.

In addition to the power cable and antenna cable, an accessory cable can be attached to a
connector on the rear of the radio. The accessory cable enables you to connect accessories to the
radio, such as an external speaker, emergency switch, foot-operated PTT, and ignition sensing, etc.

16.8 MHz
Reference Clock
from Synthesizer

Disc Audio

To RF Section

To Synthesizer

Digital
Architecture

3.3 V
Regulator

Mod
Out

Audio/Signaling

Architecture

Audio

ASFIC_CMP

SPI

RAM

EEPROM

FLASH

.

PA

µP Clock

HC11FL0

Figure 2-5 Controller Block Diagram

External
Microphone

Internal
Microphone

External
Speaker

Internal

Speaker

SCI to
Accessory &

Control Head
Connector

Handset

5.1 Radio Power Distribution

Voltage distribution is provided by five separate devices:

• U514 P-cH FET - Batt + (Ext_SWB+)

• U501 LM2941T - 9.3 V

• U503 LP2951CM - 5 V

• U508 MC 33269DTRK - 3.3 V

• U510 LP2986ILDX - 3.3 V Digital

Controller Theory of Operation 2-9

The DC voltage applied to connector P2 supplies power directly to the following circuitry:

• Electronic on/off control

• RF power amplifier

• 12 volts P-cH FET -U514

• 9.3 volt regulator

•Audio PA

Ignition

Auto
On/Off
Switch
Control

B+

Ferrite Bit

Filt_B+

FET
P-CH

On/Off
Control

11-16.6 V

0.9A

On/Off
Control

RF_PA
Audio_PA

Antenna Switch
Power Control

500mA

SW_Filt_B+

U501

9.3 V Regulator

Acces Conn
Audio PA_Soutdown
Power Loop Op_Amp

0.85A

9.3 V
45 mA

5 V RF Regulator

500 mA
Rx_Amp

PA_Pre-driver
PA D r iver

9.3 V
65 mA

U503

LVF RAC_N
IF_Amp

Mic Connector

Mic Bias
9 V, 5 mA

Status LEDs

7_Seg
DOT

Back
light

9.3 V
75 mA

U508

3.3 V RF Reg

ASFIC_CMP
IFIC
RX Cct

Control Head

9.3 V
162 mA

25 mA50 mA45 mA

Keypad

7_Seg

Bed
to
7-Seg

Shift
Reg

U510

3.3 V D Reg

micro P
RAM
Flash
EEPROM

3.2 V
72 mA

Reset

90 mA

Figure 2-6 DC Power Distribution Block Diagram

Regulator U501 is used to generate the 9.3 volts required by some audio circuits, the RF circuitry
and power control circuitry. Input and output capacitors are used to reduce high frequency noise.
Resistors R5001 / R5081 set the output voltage of the regulator. This regulator output is
electronically enabled by a 0 volt signal on pin 2. Q502, Q505 and R5038 are used to disable the
regulator when the radio is turned off.

Voltage regulator U510 provides 3.3 volts for the digital circuitry. Operating voltage is from the
regulated 9.3 V supply. Input and output capacitors are used to reduce high frequency noise and
provide proper operation during battery transients. U510 provides a reset output that goes to 0 volts
if the regulator output goes below 3.1 volts. This is used to reset the controller to prevent improper
operation.

Voltage regulator U508 provides 3.3 V for the RF circuits and ASFIC_CMP. Input and output
capacitors are used to reduce the high frequency noise and provide proper operation during battery
transients.

2-10 THEORY OF OPERATION

Voltage regulator U503 provides 5 V for the RF circuits. Input and output capacitors are used to
reduce the high frequency noise and provide proper operation during battery transients.

5.2 Protection Devices

Diode VR500 acts as protection against ESD, wrong polarity of the supply voltage, and load dump.

VR692 - VR699 are for ESD protection.

5.3 Automatic On/Off

The radio can be switched ON in any one of the following three ways:

• On/Off switch. (No Ignition Mode)

• Ignition and On/Off switch (Ignition Mode)

• Emergency

5.3.1 No Ignition Mode

When the radio is connected to the car battery for the first time, Q500 will be in saturation, Q503 will
cut-off, Filt_B+ will pass through R5073, D500, and S5010-pin 6 (On/Off switch). When S5010 is
ON, Filt_B+ will pass through S5010-pin5, D511, R5069, R5037 and base of Q505 and move Q505
into saturation. This pulls U501-pin2 through R5038, D502 to 0.2 V and turns On U514 and U501

9.3 V regulator which supplies voltage to all other regulators and consequently turns the radio on,
When U504 (ASFIC_CMP) gets 3.3 V, GCB2 goes to 3.3 V and holds Q505 in saturation, for soft
turn off.

5.3.2 Ignition Mode

When ignition is connected for the first time, it will force high current through Q500 collector, This
will move Q500 out of saturation and consequently Q503 will cut-off. S5010 pin 6 will get ignition
voltage through R601 (for load dump), R610, (R610 & C678 are for ESD protection), VR501,
R5074, and D500. When S5010 is ON, Filt_B+ passes through S5010-pin 5, D511, R5069, R5037
and base of Q505 and inserts Q505 into saturation. This pulls U501-pin 2 through R5038, D502 to

0.2 V and turns on U514 and U501 9.3 V regulator which supply voltage to all other regulators and
turns the radio on, When U504 (ASFIC_CMP) get 3.3 V supply, GCB2 goes to 3.3 V and holds
Q505 in saturation state to allow soft turn off,

When ignition is off Q500, Q503 will stay at the same state so S5010 pin 6 will get 0 V from Ignition,
Q504 goes from Sat to Cut, ONOFF_SENSE goes to 3.3 V and it indicates to the radio to soft turn
itself by changing GCB2 to ‘0’ after de registration if necessary.

5.3.3 Emergency Mode

The emergency switch (P1 pin 9), when engaged, grounds the base of Q506 via EMERGENCY
_ACCES_CONN. This switches Q506 to off and consequently resistor R5020 pulls the collector of
Q506 and the base of Q506 to levels above 2 volts. Transistor Q502 switches on and pulls U501
pin2 to ground level, thus turning ON the radio. When the emergency switch is released R5030 pulls
the base of Q506 up to 0.6 volts. This causes the collector of transistor Q506 to go low (0.2 V),
thereby switching Q502 to off.

Controller Theory of Operation 2-11

While the radio is switched on, the µP monitors the voltage at the emergency input on the accessory
connector via U403-pin 62. Three different conditions are distinguished: no emergency kit is
connected, emergency kit connected (unpressed), and emergency press.

If no emergency switch is connected or the connection to the emergency switch is broken, the
resistive divider R5030 / R5049 will set the voltage to about 3.14 volts (indicates no emergency kit
found via EMERGENCY_SENSE line). If an emergency switch is connected, a resistor to ground
within the emergency switch will reduce the voltage on EMERGENCY _SENSE line, and indicate to
the µP that the emergency switch is operational. An engaged emergency switch pulls line
EMERGENCY _SENSE line to ground level. Diode VR503 limits the voltage to protect the µP input.

While EMERGENCY _ACCES_CONN is low, the µP starts execution, reads that the emergency
input is active through the voltage level of µP pin 64, and sets the DC POWER ON output of the
ASFIC CMP pin 13 to a logic high. This high will keep Q505 in saturation for soft turn off.

5.4 Microprocessor Clock Synthesiser

The clock source for the µP system is generated by the ASFIC CMP (U504). Upon power-up the
synthesizer IC (FRAC-N) generates a 16.8 MHz waveform that is routed from the RF section to the
ASFIC CMP pin 34. For the main board controller the ASFIC CMP uses 16.8 MHz as a reference
input clock signal for its internal synthesizer. The ASFIC CMP, in addition to audio circuitry, has a
programmable synthesizer which can generate a synthesized signal ranging from 1200 Hz to

32.769 MHz in 1200 Hz steps.

When power is first applied, the ASFIC CMP will generate its default 3.6864 MHz CMOS square
wave UP CLK (on U504 pin 28) and this is routed to the µP (U403 pin 90). After the µP starts
operation, it reprograms the ASFIC CMP clock synthesizer to a higher UP CLK frequency (usually

7.3728 or 14.7456 MHz) and continues operation.

The ASFIC CMP may be reprogrammed to change the clock synthesizer frequencies at various
times depending on the software features that are executing. In addition, the clock frequency of the
synthesizer is changed in small amounts if there is a possibility of harmonics of the clock source
interfering with the desired radio receive frequency.

The ASFIC CMP synthesizer loop uses C5025, C5024 and R5033 to set the switching time and jitter
of the clock output. If the synthesizer cannot generate the required clock frequency it will switch
back to its default 3.6864 MHz output.

Because the ASFIC CMP synthesizer and the µP system will not operate without the 16.8 MHz
reference clock it (and the voltage regulators) should be checked first when debugging the system.

2-12 THEORY OF OPERATION

5.5 Serial Peripheral Interface (SPI)

The µP communicates to many of the IC’s through its SPI port. This port consists of SPI TRANSMIT
DATA (MOSI) (U403-pin100), SPI RECEIVE DATA (MISO) (U403-pin 99), SPI CLK (U0403-pin1)
and chip select lines going to the various IC’s, connected on the SPI PORT (BUS). This BUS is a
synchronous bus, in that the timing clock signal CLK is sent while SPI data (SPI TRANSMIT DATA
or SPI RECEIVE DATA) is sent. Therefore, whenever there is activity on either SPI TRANSMIT
DATA or SPI RECEIVE DATA there should be a uniform signal on CLK. The SPI TRANSMIT DATA
is used to send serial from a µP to a device, and SPI RECEIVE DATA is used to send data from a
device to a µP.

There are two IC’s on the SPI BUS, ASFIC CMP (U504 pin 22)), and EEPROM (U400). In the RF
sections there is one IC on the SPI BUS, the FRAC-N Synthesizer. The chip select line CSX from
U403 pin 2 is shared by the ASFIC CMP and FRAC-N Synthesizer. Each of these IC’s check the
SPI data and when the sent address information matches the IC’s address, the following data is
processed.

When the µP needs to program any of these Is it brings the chip select line CSX to a logic “0” and
then sends the proper data and clock signals. The amount of data sent to the various IC’s are
different; e.g., the ASFIC CMP can receive up to 19 bytes (152 bits). After the data has been sent
the chip select line is returned to logic “1”.

5.6 SBEP Serial Interface

The SBEP serial interface allows the radio to communicate with the Customer Programming
Software (CPS), or the Universal Tuner via the Radio Interface Box (RIB) or the cable with internal
RIB. This interface connects to the SCI pin via control head connector (J2-pin 17) and to the
accessory connector P1-6 and comprises BUS+. The line is bi-directional, meaning that either the
radio or the RIB can drive the line. The µP sends serial data and it reads serial data via pin 97.
Whenever the µP detects activity on the BUS+ line, it starts communication.

5.7 General Purpose Input/Output

The controller provides six general purpose lines (PROG I/O) available on the accessory connector
P1 to interface to external options. Lines PROG IN 3 and 6 are inputs, PROG OUT 4 is an output
and PROG IN OUT 8, 12 and 14 are bi-directional. The software and the hardware configuration of
the radio model define the function of each port.

• PROG IN 3 can be used as external PTT input, or others, set by the CPS. The µP reads this
port via pin 72 and Q412.

• PROG OUT 4 can be used as external alarm output, set by the CPS. Transistor Q401 is
controlled by the µP (U403 pin 55)

• PROG IN 6 can be used as normal input, set by the CPS. The µP reads this port via pin 73
and Q411. This pin is also used to communicate with the RIB if resistor R421 is placed.

• DIG IN OUT 8,12,14 are bi-directional and use the same circuit configuration. Each port uses
an output Q416, Q404, Q405 controlled by µP pins 52, 53, 54. The input ports are read
through µP pins 74, 76, 77; using Q409, Q410, Q411

Controller Theory of Operation 2-13

5.8 Normal Microprocessor Operation

For this radio, the µP is configured to operate in one of two modes, expanded and bootstrap. In
expanded mode the µP uses external memory devices to operate, whereas in bootstrap operation
the µP uses only its internal memory. In normal operation of the radio the µP is operating in
expanded mode as described below.

During normal operation, the µP (U403) is operating in expanded mode and has access to 3
external memory devices; U400 (EEPROM), U402 (SRAM), U404 (Flash). Also, within the µP there
are 3 Kilobytes of internal RAM, as well as logic to select external memory devices.

The external EEPROM (U400) space contains the information in the radio which is customer
specific, referred to as the codeplug. This information consists of items such as: 1) what band the
radio operates in, 2) what frequencies are assigned to what channel, and 3) tuning information.

The external SRAM (U402) as well as the µP’s own internal RAM space are used for temporary
calculations required by the software during execution. All of the data stored in both of these
locations is lost when the radio powers off.

The µP provides an address bus of 16 address lines (ADDR 0 - ADDR 15), and a data bus of 8 data
lines (DATA 0 - DATA 7). There are also 3 control lines; CSPROG (U403-38) to chip select U404-pin
30 (FLASH), CSGP2 (U403-pin 41) to chip select U404-pin 20 (SRAM) and PG7_R_W (U403-pin 4)
to select whether to read or to write. The external EEPROM (U400-pin1).

When the µP is functioning normally, the address and data lines should be toggling at CMOS logic
levels. Specifically, the logic high levels should be between 3.1 and 3.3 V, and the logic low levels
should be between 0 and 0.2 V. No other intermediate levels should be observed, and the rise and
fall times should be <30ns.

The low-order address lines (ADDR 0 - ADDR 7) and the data lines (DATA 0-DATA 7) should be
toggling at a high rate, e.g., you should set your oscilloscope sweep to 1us/div. or faster to observe
individual pulses. High speed CMOS transitions should also be observed on the µP control lines.

On the µP the lines XIRQ (U403-pin 48), MODA LIR (U403-pin 58), MODB VSTPY (U403-pin 57)
and RESET (U403-pin 94) should be high at all times during normal operation. Whenever a data or
address line becomes open or shorted to an adjacent line, a common symptom is that the RESET
line goes low periodically, with the period being in the order of 20ms. In the case of shorted lines you
may also detect the line periodically at an intermediate level, i.e. around 2.5 V when two shorted
lines attempt to drive to opposite rails.

The MODA LIR (U403-pin 58) and MODB VSTPY (U403-pin 57) inputs to the µP must be at a logic
“1” for it to start executing correctly. After the µP starts execution it will periodically pulse these lines
to determine the desired operating mode. While the Central Processing Unit (CPU) is running,
MODA LIR is an open-drain CMOS output which goes low whenever the µP begins a new
instruction. An instruction typically requires 2-4 external bus cycles, or memory fetches.

There are eight analog-to-digital coverter ports (A/D) on U403 labelled within the device block as
PEO-PE7. These lines sense the voltage level ranging from 0 to 3.3 V of the input line and convert
that level to a number ranging from 0 to 255 which is read by the software to take appropriate action.

2-14 THEORY OF OPERATION

5.9 Static Random Access Memory (SRAM)

The SRAM (U402) contains temporary radio calculations or parameters that can change very
frequently, and which are generated and stored by the software during its normal operation. The
information is lost when the radio is turned off.

The device allows an unlimited number of write cycles. SRAM accesses are indicated by the CS
signal U402 (which comes from U403-CSGP2) going low. U402 is commonly referred to as the
external RAM as opposed to the internal RAM which is the 3 Kilobytes of RAM which is part of the
68HC11FL0. Both RAM spaces serve the purpose. However, the internal RAM is used for the
calculated values which are accessed most often.

Capacitor C402 and C411 serves to filter out any AC noise which may ride on +3.3 V at U402

6.0 Control Board Audio and Signalling Circuits

6.1 Audio Signalling Filter IC and Compander (ASFIC CMP)

The ASFIC CMP (U504) used in the controller has the following four functions:

1. RX/TX audio shaping, i.e. filtering, amplification, attenuation

2. RX/TX signaling, PL/DPL/HST/MDC

3. Squelch detection

4. µP clock signal generation

The ASFIC CMP is programmable through the SPI BUS (U504 pins-20/21/22), normally receiving
19 bytes. This programming sets up various paths within the ASFIC CMP to route audio and/or
signaling signals through the appropriate filtering, gain and attenuator blocks. The ASFIC CMP also
has 6 General Control Bits GCB0-5 which are CMOS level outputs and used for the following:

• GCBO - BW Select

• GCBI - switches the audio PA On/Off

• GCB2 - DC Power On switches the voltage regulator (and the radio) on and off

• GCB3 - Control on MUX U509 pin 9 to select between Low Cost Mic path to STD Mic Path

• GCB4 - Control on MUX U509 pin 11 to select between Flat RX path to filtered RX path on the
accessory connector.

• GCB5 - Control on MUX U509 pin 10 to select between Flat TX path mute and Flat TX path

Transmit Audio Circuits 2-15

7.0 Transmit Audio Circuits

MIC

EXT MIC

FLAT TX

AUDIO

J2

15

CONTROL HEAD

CONNECTOR

P1

ACCESSORY

CONNECTOR

24kOhms

44

MIC
INT

GCB3

MIC
EXT

AUX
TX

GCB5

TX SND

MIC

ASFIC_CMP

IN

U504

HS SUMMER

LS SUMMER

LIMITER

SPLATTER

FILTER

U509

MUX

46

35

2

5

U509

MUX

AUDIO MUTE

48

42

38

FLAT TX

36

TX RTN

FILTERS AND

PREEMPHASIS

ATTENUATOR

VCO

ATN

MOD IN

40

TO
RF

SECTION

(SYNTHESIZER)

Figure 2-7 Transmit Audio Paths

7.1 Microphone Input Path

The radio supports 2 distinct microphone paths known as internal (from control head J2-15) and
external mic (from accessory connector P1-2) and an auxiliary path (FLAT TX AUDIO, from
accessory connector P1-5). The microphones used for the radio require a DC biasing voltage
provided by a resistive network.

The two microphone audio input paths enter the ASFIC CMP at U504-pin 48 (external mic) and
U504-pin 46 (internal mic). The microphone is plugged into the radio control head and connected to
the audio DC via J2-pin 15. The signal is then routed via C5045 to MUX U509 that select between
two paths with different gain to support Low Cost Mic (Mic with out amplifier in it) and Standard Mic.

7.1.1 Low Cost Microphone

Hook Pin is shorted to Pin 1(9.3 V) inside the Low Cost Mic, This routes 9.3 V to R429, and creates

2.6 V on MIC_SENSE (u.P U403-67) by Voltage Divider R429/R430. U403 senses this voltage and
sends command to ASFIC_CMP U504 to get GCB3 = ‘0’. The audio signal is routed from C5045 via
U509-5 (Z0), R5072, U507, R5026, C5091, R5014 via C5046 to U504- 46 int. mic (C5046 100nF
creates a159 Hz pole with U504- 46 int mic impedance of 16Kohm).

2-16 THEORY OF OPERATION

7.1.2 Standard Microphone

Hook Pin is shorted to the hook mic inside the standard Mic, If the mic is out off hook, 3.3 V is routed
to R429 via R458, D401, and it create 0.7 V on MIC_SENSE (u.P U403-67) by Voltage Divider
R429/R430. U403 senses this voltage and sends command to ASFIC_CMP U504 to get GCB3 =‘1’.
The audio signal is routed from C5045 via U509-3 (Z1), R5072, U507, R5026, C5091, R5014 via
C5046 to U504- 46 int mic (C5046 100nF create a159 Hz pole with U504- 46 int mic impedance of
16Kohm). 9.3 Vdc is routed via R5077, R5075 to J2-15, It create 4.65V with Mic Impedance. C5010
supplies AC Ground to create AC impedance of 510 Ohms via R5075. and Filter 9.3 Vdc mic bias
supply.

Note: The audio signal at U504-pin 46 should be approximately 12 mV for 1.5 kHz or 3 kHz of
deviation with 12.5 kHz or 25 kHz channel spacing.

The external microphone signal enters the radio on accessory connector P1 pin 2 and is routed via
line EXT MIC to R5054. R5078 and R5076 provide the 9.3 Vdc bias. Resistive divider R5054/
R5070 divide the input signal by 5.5 and provide input protection for the CMOS amplifier input.
R5076 and C5009 provide a 510 ohm AC path to ground that sets the input impedance for the
microphone and determines the gain based on the emitter resistor in the microphone’s amplifier
circuit.

C5047 serves as a DC blocking capacitor. The audio signal at U504-pin 48 should be approximately
14 mV for 1.5 kHz or 3 kHz of deviation with 12.5 kHz or 25 kHz channel spacing.

The FLAT TX AUDIO signal from accessory connector P1-pin 5 is fed to the ASFIC CMP (U504 pin
42 through U509 pin 2 to U509 pin 15 via U506 OP-AMP circuit and C5057.

The ASFIC has an internal AGC that can control the gain in the mic audio path. The AGC can be
disabled / enabled by the µP. Another feature that can be enabled or disabled in the ASFIC is the
VOX. This circuit, along with Capacitor C5023 at U504-pin 7, provides a DC voltage that can allow
the µP to detect microphone audio. The ASFIC can also be programmed to route the microphone
audio to the speaker for public address operation.

7.2 PTT Sensing and TX Audio Processing

Internal microphone PTT is sensed by µP U403 pin 71. Radio transmits when this pin is “0” and
selects inside the ASFIC_ CMP U504 internal Mic path. When the internal Mic PTT is “0” then
external Mic PTT is grounded via D402. External Mic PTT is sensed by U403 pin 72 via Q412
circuits. The radio transmits when this pin is “0” and selects inside the ASFIC _CMP U504 External
Mic path.

Inside the ASFIC CMP, the mic audio is filtered to eliminate frequency components outside the 300­3000 Hz voice band, and pre-emphasized if pre-emphasis is enabled. The signal is then limited to
prevent the transmitter from over deviating. The limited mic audio is then routed through a summer,
which is used to add in signaling data, and then to a splatter filter to eliminate high frequency
spectral components that could be generated by the limiter. The audio is then routed to an
attenuator, which is tuned in the factory or the field to set the proper amount of FM deviation. The
TX audio emerges from the ASFIC CMP at U504-pin 40 MOD IN, at which point it is routed to the
RF section.

Transmit Signalling Circuits 2-17

8.0 Transmit Signalling Circuits

HS

SUMMER

5-3-2 STATE

ENCODER

DTMF

ENCODER

ASFIC_CMP U504

PL

ENCODER

SPLATTER

FILTER

LS

SUMMER

ATTENUATOR

40
MOD IN

TO RF

SECTION

(SYNTHESIZER)

MICRO

CONTROLLER

U403

44

85

80

82

SPI

BUS

HIGH SPEED

19

CLOCK IN
(HSIO)

18

LOW SPEED
CLOCK IN
(LSIO)

Figure 2-8 Transmit Signalling Path

From a hardware point of view, there are 3 types of signaling:

• Sub-audible data (PL / DPL / Connect Tone) that gets summed with transmit voice or
signaling,

• DTMF data for telephone communication in trunked and conventional systems, and

• Audible signaling including MDC and high-speed trunking.

Note: All three types are supported by the hardware while the radio software determines which
signaling type is available.

8.1 Sub-Audio Data (PL/DPL)

Sub-audible data implies signaling whose bandwidth is below 300 Hz. PL and DPL waveforms are
used for conventional operation and connect tones for trunked voice channel operation. The
trunking connect tone is simply a PL tone at a higher deviation level than PL in a conventional
system. Although it is referred to as “sub-audible data”, the actual frequency spectrum of these
waveforms may be as high as 250 Hz, which is audible to the human ear. However, the radio
receiver filters out any audio below 300 Hz, so these tones are never heard in the actual system.

Only one type of sub-audible data can be generated by U504 (ASFIC CMP) at any one time. The
process is as follows, using the SPI BUS, the µP programs the ASFIC CMP to set up the proper low­speed data deviation and select the PL or DPL filters. The µP then generates a square wave which
strobes the ASFIC PL / DPL encode input LSIO U504-pin 18 at twelve times the desired data rate.
For example, for a PL frequency of 103 Hz, the frequency of the square wave would be 1236 Hz.

This drives a tone generator inside U504 which generates a staircase approximation to a PL sine
wave or DPL data pattern. This internal waveform is then low-pass filtered and summed with voice
or data. The resulting summed waveform then appears on U504-pin 40 (MOD IN), where it is sent to
the RF board as previously described for transmit audio. A trunking connect tone would be
generated in the same manner as a PL tone.

2-18 THEORY OF OPERATION

8.2 High Speed Data

High speed data refers to the 3600 baud data waveforms, known as Inbound Signaling Words
(ISWs) used in a trunking system for high speed communication between the central controller and
the radio. To generate an ISW, the µP first programs the ASFIC CMP (U504) to the proper filter and
gain settings. It then begins strobing U504-pin 19 (HSIO) with a pulse when the data is supposed to
change states. U504’s 5-3-2 State Encoder (which is in a 2-state mode) is then fed to the post­limiter summer block and then the splatter filter. From that point it is routed through the modulation
attenuator and then out of the ASFIC CMP to the RF board. MDC is generated in much the same
way as trunking ISW. However, in some cases these signals may also pass through a data pre­emphasis block in the ASFIC CMP. Also these signaling schemes are based on sending a
combination of 1200 Hz and 1800 Hz tones only. Microphone audio is muted during high speed data
signaling.

8.3 Dual Tone Multiple Frequency (DTMF) Data

DTMF data is a dual tone waveform used during phone interconnect operation. It is the same type
of tones which are heard when using a “Touch Tone” telephone.

There are seven frequencies, with four in the low group (697, 770, 852, 941 Hz) and three in the
high group (1209, 1336, 1477 Hz). The high-group tone is generated by the µP (U403-46) strobing
U504-19 at six times the tone frequency for tones less than 1440 Hz or twice the frequency for
tones greater than 1440 Hz. The low group tone is generated by the ASFIC CMP, controlled by the
µP via SPI bus. Inside U504 the low-group and high-group tones are summed (with the amplitude of
the high group tone being approximately 2 dB greater than that of the low group tone) and then pre­emphasized before being routed to the summer and splatter filter. The DTMF waveform then follows
the same path as was described for high-speed data.

Receive Audio Circuits 2-19

9.0 Receive Audio Circuits

ACCESSORY
CONNECTOR

11

FLT RX AUDIO

SPKR +

SPKR -

INT

SPKR-

CONTROL HEAD

CONNECTOR

LS IO

SQ DET

17

83

P1

16

1

19

20

J2

18

HANDSET

AUDIO

18

80

85

EXTERNAL

SPEAKER

INTERNAL
SPEAKER

FROM

RF

SECTION

(IF IC)

DISC

AUDIO

43

37

2

GCB4

AUX RX

DISC

U509

U IO

DEEMPHASIS

1

9

MUTE

39

4110

AUDIO

URX OUT

VOLUME

ATTEN.

FILTER AND

LIMITER, RECTIFIER

FILTER, COMPARATOR

AUDIO

PA

U502

U505

CH ACT

4

6

INT

SPKR+

14

GCB1

ASFIC_CMP
U504

PL FILTER

LIMITER

SQUELCH

CIRCUIT

16

84

MICRO

CONTROLLER

U403

9.1 Squelch Detect

The radio’s RF circuits are constantly producing an output at the discriminator (IF IC). This signal
(DISC AUDIO) is routed to the ASFIC CMP’s squelch detect circuitry input DISC (U504-pin 2). All of
the squelch detect circuitry is contained within the ASFIC CMP. Therefore from a user’s point of
view, DISC AUDIO enters the ASFIC CMP, and the ASFIC CMP produces two CMOS logic outputs
based on the result. They are CH ACT (U504-16) and SQ DET (U504-17).

The squelch signal entering the ASFIC CMP is amplified, filtered, attenuated, and rectified. It is then
sent to a comparator to produce an active high signal on CH ACT. A squelch tail circuit is used to
produce SQ DET (U504-17) from CH ACT. The state of CH ACT and SQ DET is high (logic “1”)
when carrier is detected, otherwise low (logic “0”).

CH ACT is routed to the µP pin 84 while SQ DET is routed to the µP pin 83.

SQ DET is used to determine all audio mute / unmute decisions except for Conventional Scan. In
this case CH ACT is a pre-indicator as it occurs slightly faster than SQ DET.

Figure 2-9 Receive Audio Paths

2-20 THEORY OF OPERATION

9.2 Audio Processing and Digital Volume Control

The receiver audio signal (DISC AUDIO) enters the controller section from the IF IC where it is.DC
coupled to ASFIC CMP via the DISC input U504-pin 2. The signal is then applied to both the audio
and the PL/DPL paths

The audio path has a programmable amplifier, whose setting is based on the channel bandwidth
being received, an LPF filter to remove any frequency components above 3000 Hz, and a HPF to
strip off any sub-audible data below 300 Hz. Next, the recovered audio passes through a de­emphasis filter (if it is enabled to compensate for Pre-emphasis which is used to reduce the effects
of FM noise). The IC then passes the audio through the 8-bit programmable attenuator whose level
is set depending on the value of the volume control. Finally the filtered audio signal passes through
an output buffer within the ASFIC CMP. The audio signal exits the ASFIC CMP at AUDIO output
(U504 pin 41).

The µP programs the attenuator, using the SPI BUS, based on the volume setting. The minimum /
maximum settings of the attenuator are set by codeplug parameters.

Since sub-audible signaling is summed with voice information on transmit, it must be separated
from the voice information before processing. Any sub-audible signaling enters the ASFIC CMP
from the IF IC at DISC U504-2. Once inside, it goes through the PL/DPL path. The signal first
passes through one of the two low-pass filters, either the PL low-pass filter or the DPL/LST low-pass
filter. Either signal is then filtered and goes through a limiter and exits the ASFIC CMP at LSIO
(U504-pin 18). At this point, the signal will appear as a square wave version of the sub-audible
signal which the radio received. The µP U403 pin 80 will decode the signal directly to determine if it
is the tone / code which is currently active on that mode.

9.3 Audio Amplification Speaker (+) Speaker (-)

The output of the ASFIC CMP’s digital volume pot, U504-pin 41 is routed through DC blocking
capacitor C5049 to the audio PA (U502 pin 1 and 9).

The audio power amplifier has one inverted and one non-inverted output that produces the
differential audio output SPK+/SPK- (U502 pins 4 and 6)

The audio PA is enabled via the ASFIC CMP (U504-GCB1). When the base of Q501 is low, the
transistor is off and U502-pin 8 is high, using pull up resistor R5041, and the audio PA is ON. The
voltage at U502-pin 8 must be above 8.5 Vdc to properly enable the device.

If the voltage is between 3.3 and 6.4 V, the device will be active but has its input (U502-pins 1/9) off.
This is a mute condition which is used to prevent an audio pop when the PA is enabled.

The SPK+ and SPK- outputs of the audio PA have a DC bias which varies proportionately with B+
(U502- pin 7). B+ of 11 V yields a DC offset of 5 V, and B+ of 17 V yields a DC offset of 8.5 V. If
either of these lines is shorted to ground, it is possible that the audio PA will be damaged. SPK+ and
SPK- are routed to the accessory connector (P1-pin 1 and 16) and to the control head (connector
J2-pins 19 and 20).

Receive Signalling Circuits 2-21

9.4 Handset Audio

Certain handheld accessories have a speaker within them which require a different voltage level
than that provided by U502. For these devices HANDSET AUDIO is available at control head
connector J2 pin18.

The received audio from the output of the ASFIC CMP’s digital volume attenuator is routed to U505
pin 2 where it is amplified. This signal is routed from the output of the op-amp U505 to J2-pin 18.
From the control head, the signal is sent directly to the microphone jack.

9.5 Filtered Audio and Flat Audio

The ASFIC CMP output audio at U504-pin 39 is filtered and de-emphasized, but has not gone
through the digital volume attenuator. From ASFIC CMP U504-pin 39 the signal is routed via R5034
through gate U509-pin 12 and AC coupled to U505-pin 6. The gate controlled by ASFIC CMP port
GCB4 selects between the filtered audio signal from the ASFIC CMP pin 39 (URXOUT) or the
unfiltered (flat) audio signal from the ASFIC CMP pin 10 (UIO). Resistors R5034 and R5021
determine the gain of op-amp UU505-pin 6 for the filtered audio while R5032 and R5021 determine
the gain for the flat Audio. The output of U505-pin 7 is then routed to P1 pin 11 via DC blocking
capacitor C5003. Note that any volume adjustment of the signal on this path must be done by the
accessory.

10.0 Receive Signalling Circuits

DET AUDIO

DISCRIMINATOR AUDIO

FROM RF SECTION

(IF IC)

DATA FILTER

AND DEEMPHASIS

DISC

2

FILTER

PLEAP

8

LIMITER

ASFIC_CMP

U504

LIMITER

PLCAP2

25

Figure 2-10 Receive Signalling Paths

10.1 Sub-Audio Data (PL/DPL) and High Speed Data Decoder

The ASFIC CMP (U504) is used to filter and limit all received data. The data enters the ASFIC CMP
at input DISC (U504 pin 2). Inside U504 the data is filtered according to data type (HS or LS), then it
is limited to a 0-3.3 V digital level. The MDC and trunking high speed data appear at U504-pin 19,
where it connects to the µP U403 pin 80.

HSIO

LSIO

19

18

82

CONTROLLER

44

80

85

MICRO

U403

2-22 THEORY OF OPERATION

The low speed limited data output (PL, DPL, and trunking LS) appears at U504-pin18, where it
connects to the µP U403-pin 80.

The low speed data is read by the µP at twice the frequency of the sampling waveform; a latch
configuration in the ASFIC CMP stores one bit every clock cycle. The external capacitors C5028,
and C5026 set the low frequency pole for a zero crossings detector in the limiters for PL and HS
data. The hysteresis of these limiters is programmed based on the type of received data.

10.2 Alert Tone Circuits

When the software determines that it needs to give the operator an audible feedback (for a good
key press, or for a bad key press), or radio status (trunked system busy, phone call, circuit failures),
it sends an alert tone to the speaker. It does so by sending SPI BUS data to U504 which sets up the
audio path to the speaker for alert tones. The alert tone itself can be generated in one of two ways:
internally by the ASFIC CMP, or externally using the µP and the ASFIC CMP.

The allowable internal alert tones are 304, 608, 911, and 1823 Hz. In this case a code contained
within the SPI BUS load to the ASFIC CMP sets up the path and determines the tone frequency,
and at what volume level to generate the tone. (It does not have to be related to the voice volume
setting.)

For external alert tones, the µP can generate any tone within the 100-3000 Hz audio band. This is
accomplished by the µP generating a square wave which enters the ASFIC CMP at U504 pin 19.
Inside the ASFIC CMP this signal is routed to the alert tone generator.

The output of the generator is summed into the audio chain just after the RX audio de-emphasis
block. Inside U504, the tone is amplified and filtered, then passed through the 8-bit digital volume
attenuator, which is typically loaded with a special value for alert tone audio. The tone exits at U504­pin 41 and is routed to the audio PA like receive audio.

Chapter 3

TROUBLESHOOTING CHARTS

This section contains detailed troubleshooting flowcharts. These charts should be used as a guide in
determining the problem areas. They are not a substitute for knowledge of circuit operation and
astute troubleshooting techniques. It is advisable to refer to the related detailed circuit descriptions
in the theory of operation sections prior to troubleshooting a radio.

Most troubleshooting charts end up by pointing to an IC to replace. It is not always noted, but it is
good practice to verify supplies and grounds to the affected IC and to trace continuity to the
malfunctioning signal and related circuitry before replacing any IC. For instance, if a clock signal is
not available at a destination, continuity from the source IC should be checked before replacing the
source IC.

3-2 TROUBLESHOOTING CHARTS

1.0 Troubleshooting Flow Chart for Receiver RF (Sheet 1 of 2)

START

Yes

Problem in 12 KHz and

25 KHz channel spacing

Go to

DC Section

SW Problem

SW Problem

Go to SYN

Section

No

No

No

No

9V on

R310 (LNA)

OK

?

RX_EN

ON ?

LOC_DIST

ON

?

LO

POWER

OK ?

Yes

Yes

Yes

Yes

Check

RX_EN

Check

LOC_DIST

Check

TPI

Check 5V

on R337 (UHF),

R336 (VHF)

Go to

DC Section

No

3 V

to U301

Okay ?

Yes

Check D301-304

Replace IF Filters( FL304, FL301

If problem in 25 KHz spacing

Go to

DC Section

No

5V

(IF AMP)

OK ?

Go

to A

Yes

Check 3V

on R339

Troubleshooting Flow Chart for Receiver RF (Sheet 1 of 2) 3-3

1.1 Troubleshooting Flow Chart for Receiver (Sheet 2 of 2)

From

A

Go to

DC Section

Check

the component

FE Problem

Replace

Q303, Q301

Check passive

components

No

No

No

3V

(IFIC -Vcc)

OK ?

Installation

OK ?

RF

Power

> -28 dBM

?

Check visually

Yes

Yes

Yes

Replace

Q305, Q300, U302

Check passive

components

FE and BE

components

installation ?

Inject - 40dBm (CW)

to RF connector

Check Power on

C335 (UHF) C332 (VHF)

Check Power on

C337 (UHF),

C336 (VHF)

No

RF

Power

> -28 dBM

?

Yes

Check Y301

44.395 MHz

Replace Y301

Go to DC Section

No

3V to

U301

OK

?

No

Yes

Y301

OK

?

Yes

Replace U300

Replace Q302, Y300

Check D301 - 304

3-4 TROUBLESHOOTING CHARTS

2.0 Troubleshooting Flow TX RF (No Output Power)

START

Key the radio using

Radster (type k)

Press F6 and

read the ASFIC byte

Tune the

PA_BIAS

Replace

L108

Yes

Yes

Is

Byte

#04=0

?

Is

POUT

< 1 Watt

?

No

No

Put 80 Hex in byte #06

and measure the

Output Power

End

Troubleshooting Flow TX RF (No Output Power) 3-5

2.1 Troubleshooting Flow TX RF (No Output Power/No Current)

START

Key the radio using

Radster (type k)

Put 80 Hex in byte #06

and measure the

Output Power

Tune the

PA_BIAS

Replace

the
PA

(Q100)

Replace

R122

Yes

POUT >

10 Watts

Yes

20kOhms

< R <40KOhms

Is

No

?

Is

No

Measure the
resistance from
R131 to ground

Replace the

PA (Q100)

Tune the

PA_BIAS

3-6 TROUBLESHOOTING CHARTS

2.2 Troubleshooting Flow TX RF (Not Txing at Nominal power)

START

Key the radio using radster (type k)

Press F6 and read the ASFIC byte

Tune the PA_BIAS

Repalace PA (Q100)

Yes

Yes

Is byte

#04=0

?

Is R131

< 1K Ohm

?

No

Measure the resistance

from R131 to ground

No

Tune the K and M factors

using the Tuner tool

Troubleshooting Flow Chart for Synthesizer 3-7

3.0 Troubleshooting Flow Chart for Synthesizer

Check D200, D201,

C2026, C2025, &

C2027

YES

5V

at pin 6 of

D200

NO

Check

R228

<40 mVDC in RX &

>4.5 VDC in TX?
(at VCO section)

NO

Is

U201 Pin 19

?

YES

Correct

Problem

Is

U200 Pin 47

at = 13VDC

?

YES

Check R201

NO

U200

Pin 2 >4.5 VDC in

Tx & <40 mVDC

in Rx

Star t

NO

Is

YES

?

Visual

check of the

Board

OK?

NO

Check 5V
Regulator
U503

YES

at U200

13 & 30

signals

at Pin’s 14 &15

of U200

YES

+5V

Pin’s

?

Are

YES

NO

?

5V

at U200

pins 5, 20, 34

& 36

YES

Is

16.8MHz

Signal at U200

Pin 19

?

YES

Waveforms

at Pins 14 & 15

triangular

YES

NO

NO

Y201 and associated

Are

?

NO

C h ec k 5 V
Regulator

U503

Is

16.8MHz
signal at

U200 Pin

23?

NO

Check

Parts

NO

Pins 7,8 & 9

of U200 toggle

when channel is

changed?

Replace

U200

YES

Do

Is

RF level at

U200 Pin 32

-12 < x <-25
dBm

?

YES

Replace U200

NO

NO

Replace U200

If C2052, R208,C2067,

C2068, L210 are OK, then

see VCO

troubleshooting chart

NO

Is

there a short

between Pin 47 and

Pins 14 & 15 of

U200

?

YES

Remove

Shorts

Check programming

lines between

U403 and U200

Pins 7,8 & 9

Check uP U403

Troubleshooting

Chart

NO

YES

Is

information

from mP U403

correct

?

YES

Replace U200

3-8 TROUBLESHOOTING CHARTS

4.0 Troubleshooting Flow Chart for VCO

RX VCO

Low or no RF Signal

at TP1

Visual check

of board

OK?

YES

4.5V DC

at U201 Pin 14 & 18

OK ?

YES

35mV DC at

U201 Pin 19

OK?

YES

Is RF available

at base of Q200

YES

Are Q200

Base at 2.4V

Collector at 4.5V

Emitter at 1.7V

YES

NO

NO

NO

NO

Make sure Synthesizer is

working correctly and runner

between U200 Pin 28 and

U201 Pin 14 & and is OK

between U200 Pin 2

NO

Correct

Problem

Check runner

and U201 Pin 19

Replace U201

If all parts associated
with the pins are OK,

replace Q200

Low or no RF Signal

NO

NO

at U201 Pin 14&18

NO

Is RF available

at input to PA

Visual check

of board

OK?

YES

4.5V DC

OK ?

YES

4.8V DC at

U201 Pin 19

OK?

YES

Are U201 Pins

13 at 4.4V
15 at 1.1V
10 at 4.5V
16 at 1.9V

YES

at C2060

YES

NO

TX VCO

If all parts

NO

associated

with the pins

replace U201

If parts between

R109 & U201 Pin10

are OK, replace U201

are OK,

If all parts from collector

of Q200 to TP1 are

OK, replace Q200

Power OK but
no modulation

Check parts to pre-driver

Audio =180mVRMS

at “-” Side of

D205

YES

4.5VDC

at D205

YES

If R211 and R12 are OK,

then replace D205

NO

Replace R212

NO

Replace R211

Troubleshooting Flow Chart for DC Supply (1 of 2) 3-9

5.0 Troubleshooting Flow Chart for DC Supply (1 of 2)

Since the failure of a critical voltage supply might cause the radio to automatically power down,
supply voltages should first be probed with a multimeter. If all the board voltages are absent, then
the voltage test point should be retested using a rising-edge-triggered oscilloscope. If the voltage is
still absent, then another voltage should be tested using the oscilloscope. If that voltage is present,
then the original voltage supply in question is defective and requires investigation of associated
circuitry.

5V

Check VDC on

C5006

Go to 3V

Replace U503

Go to D3_3V

Yes

Yes

Check VDC on

Yes

V=5V

?

9v<V<9.8v

?

3V

C5008

V=3.3V

?

No

No

No

Check Voltage on

C5042

Go to Start

Check Voltage on

C5043

Replace U508

Yes

9v<V<9.8v

?

No

Go to Start

3-10 TROUBLESHOOTING CHARTS

5.1 Troubleshooting Flow Chart for DC Supply (2 of 2)

D3_3V

Check VDC on

C5007

Go to Digital Section

Replace U510

Yes

Yes

V=3.3V

?

9v<V<9.8v

?

No

No

Check Voltage on

C5041

Go to Start

UHF2 PCB/ SCHEMATICS/ PARTS LISTS

1.0 Allocation of Schematics and Circuit Boards

1.1 UHF2 and Controller Circuits

The UHF circuits are contained on the printed circuit board (PCB) which also contains the Controller
circuits. This Chapter shows the schematics for both the UHF circuits and the Controller circuits. The
PCB component layouts and the Parts Lists in this Chapter show both the Controller and UHF circuit
components. The UHF and Controller schematics and the related PCB and parts list are shown in
the tables below.

Table 4-1 UHF2 1-25 W Diagrams and Parts Lists

PCB :

8488978U01 (P9) Main Board Top Side
8488978U01 (P9) Main Board Bottom Side

SCHEMATICS

Main Circuit
Transmitter
Synthesiser and VCO
Receiver Front and Back End
DC and Audio Ccts
Microprocessor and Controller Ccts
Power Control Cct

Parts List

8488978U01 (P9) Page 4-19

Page 4-4
Page 4-5

Page 4-6/Page 4-7
Page 4-8/Page 4-9
Page 4-10/Page 4-11
Page 4-12/Page 4-13
Page 4-14/Page 4-15
Page 4-16/Page 4-17
Page 4-18

Chapter 4

Controller version is T1

Table 4-2 UHF2 1-25 W Diagrams and Parts Lists

PCB :

8486684Z02 (Rev. A) Main Board Top Side
8486684Z02 (Rev. A) Main Board Bottom Side

SCHEMATICS

Main Circuit
Transmitter
Synthesiser and VCO
Receiver Front and Back End
DC and Audio Ccts
Microprocessor and Controller Ccts
Power Control Cct

Parts List

8486684Z02 (Rev. A) Page 4-46

Controller version is T1

Page 4-31
Page 4-32

Page 4-33/Page 4-34
Page 4-35/Page 4-36
Page 4-37/Page 4-38
Page 4-39/Page 4-40
Page 4-41/Page 4-42
Page 4-43/Page 4-44
Page 4-45

4-2 UHF2 PCB/ SCHEMATICS/ PARTS LISTS

Notes

UHF 1-25 W Band 2 PCB 8488978U01 (rev. P9) / Schematics 4-3

2.0 UHF 1-25 W Band 2 PCB 8488978U01 (rev. P9) / Schematics

9V

COMP_B+

DET_VFWD

FILT_SW_B+

INTEGRATOR

PA_BIAS

PWR_SET

RX

RX_EN

TX_EN

TX_INJ

SHEET 1 OF 8

73D02968C74-O

9V

COMP_B+

DET_VFWD

FILT_SW_B+

INTEGRATOR

PA_BIAS

PWR_SET

RX

RX_EN

TX_EN

TX_INJ

MAIN

COMPARTMENT

UHF2 Interconnection between Main Board and Power Amplifier Compartment

4-4 UHF 1-25 W Band 2 PCB 8488978U01 (rev. P9) / Schematics

SHOWN FROM SIDE 1

8488978U01_P9

C301

C302

C303

C304

C305

C306

C307

C308

C309

C310

C311

C312

C313

C314

C315

C316

C317

C318

C319

C320

C322

C336

C337

C359

C360

C361

C362

C364

C365

C369

C371

C402

C406

C411

C414

C418

C490

C602

C603

C604

C605

C606

C607

C608

C609

C610

C611

C612

C613

C614

C615

C616

C617

C618

C619

C620

C621

C622

C623

C624

C625

C626

C627

C628

C629

C630

C631

C632

C633

C662

C678

C1001

C1004

C1005

C1006

C1007

C1008

C1009

C1010

C1011

C1012

C1013

C1014

C1016

C1020

C1021

C1023

C1026

C1031

C1033

C1034

C1037

C1038

C1039

C1041

C1042

C1044

C1052

C1057

C1063

C1064

C1065

C1074

C1082

C1084

C1087

C1088

C1097

C1098

C1099

C1100

C1104

C1108

C1113

C1114

C1115

C1116

C1117

C1118

C1119

C1122

C1123

C1124

C1125

C1129

C1131

C1151

C1152

C1153

C1154

C1155

C1156

C1263

C1264

C2001

C2002

C2004

C2012

C2013

C2014

C2016

C2024

C2025

C2026

C2027

C2028

C2030

C2033

C2036

C2052

C2055

C2056

C2057

C2058

C2059

C2061

C2062

C2063

C2064

C2066

C2067

C2068

C2069

C2073

C2074

C2075

C2077

C2078

C2079

C2080

C2081

C5001

C5003

C5005

C5006

C5008

C5010

C5011

C5012

C5013

C5014

C5015

C5016

C5018

C5019

C5020

C5021

C5022

C5023

C5024

C5025

C5026

C5027

C5028

C5029

C5030

C5032

C5033

C5034

C5035

C5038

C5042

C5043

C5044

C5046

C5047

C5048

C5050

C5051

C5052

C5053

C5054

C5056

C5057

C5059

C5062

C5064

C5066

C5068

C5070

C5071

C5074

C5076

C5078

C5079

C5080

C5081

C5087

C5088

C5089

C5090

C5095

C5096

C5100

C5101

C5102

C5103

C5110

C5111

C5113

C5114

C5115

C5116

C5117

C5118

2

CR300

D103

D104

D200

D201

2

D203

2

D204

D205

D301

D302

D303

D304

2

D400

2

D401

2

D500

D502

2

D513

2

3

4

5

6

FL300

FL301

FL302

4

3

2

FL303

4

3

2

FL304

O

J11

L103

L104

L105

L107

L108

L111

L113

L114

L119

L120

L122

L126

L203

L204

L205

L206

L207

L210

L211

L213

L214

L215

L303

L305

L315

M1

M2

M3

M4

M5

1

M6

1

M9

1

M100

M101

M102

M103

M104

M105

M106

M107

O

M108

O

M109

O

M110

1

P1

8

7

1

3

4

6

2

5

Q100

2

Q302

2
Q305

Q400

Q407

Q414

2

Q415

2

Q500

2

Q503

R106

R109

R148

R150

R151

R159

R171

R173

R174

R178

R179

R182

R200

R202

R206

R208

R211

R212

R217

R221

R222

R224

R225
R226

R228

R232

R233

R234

R302

R303

R304

R305

R306

R307

R308

R309

R311

R312

R313

R314

R315

R316

R317

R318

R319

R320

R321

R322

R323

R324

R325

R327

R328

R329

R332

R333

R335

R337

R339

R406

R428

R429

R430

R431

R439

R440

R441

R444

R445

R450

R451

R458

R459

R461

R462

R472

R473

R601

R602

R610

R5000

R5001

R5009

R5010

R5011

R5019

R5021

R5022

R5024

R5031

R5032

R5033

R5034

R5038

R5039

R5040

R5043

R5044

R5045

R5046

R5047

R5048

R5050

R5052

R5053

R5054

R5055

R5056

R5057

R5063

R5064

R5065

R5066

R5067

R5068

R5070

R5071

R5073

R5074

R5075

R5077

R5079

R5080

R5081

R5082

R5083

R5084

R5085

R5086

R5087

R5089

R5092

R5093

R5094

R5095

R5096

R5097

R5098

R5099

R5100

RT100

1

SH200

1

SH202

TP3

1

16

8

9

U101

1

37

25

13

U200

11

1

20

10

U300

4

58

U301

22

21

8

7

1

U402

1

4

5

8

U500

5

2

3

4

U501

1

9

U502

1

45

8

U503

1

37

25

13

U504

1

4

58

U505

1

4

5

8

U506

3

21U508

16

1

8

9

U509

U515

VR500

2

VR501

VR504

2
VR693

2

Y300

4

3

2

Y301

SHOWN FROM SIDE 1

OL 79B02969C76-O
OL 79B02969C78-O



UHF2 (438-470 MHz) 1-25 W 8488978U01 (rev. P9), Top Side

UHF 1-25 W Band 2 PCB 8488978U01 (rev. P9) / Schematics 4-5

C300

C321

C323

C324

C325

C326

C327

C328

C329

C330

C331

C332

C333

C334

C335

C338

C339

C340

C341

C342

C343

C344

C345

C346

C347

C348

C349

C350

C351

C353

C354

C355

C356

C357

C358

C366

C367

C368

C370

C400

C401

C403

C404

C405

C407

C408

C410

C412

C413

C415

C416

C417

C421

C422

C423

C1000

C1002

C1027

C1028

C1029

C1032

C1035

C1036

C1040

C1043

C1045

C1046

C1047

C1050

C1051

C1053

C1054

C1059

C1060

C1061

C1062

C1066

C1067

C1070

C1071

C1072

C1073

C1075

C1076

C1077

C1078

C1079

C1080

C1081

C1083

C1085

C1086

C1089

C1090

C1091

C1092

C1093

C1096

C1101

C1103

C1106

C1107

C1109

C1110

C1111

C1112

C1121

C1126

C1127

C1128

C1130

C1132

C1260

C1261

C2000

C2003

C2005

C2006

C2007

C2008

C2009

C2010

C2011

C2015

C2017

C2018

C2019

C2020

C2021

C2022

C2023

C2029

C2031

C2032

C2034

C2035

C2037

C2038

C2039

C2040

C2041

C2042

C2043

C2044

C2045

C2046

C2047

C2048

C2049

C2050

C2051

C2053

C2054

C2060

C2065

C2070

C2071

C2072

C2076

C2129

C2198

C5000

C5002

C5007

C5009

C5017

C5031

C5036

C5037

C5039

C5040

C5041

C5045

C5049

C5055

C5058

C5060

C5061

C5063

C5065

C5067

C5069

C5072

C5073

C5075

C5077

C5082

C5083

C5084

C5085

C5086

C5091

C5092

C5094

C5097

C5098

C5099

C5104

C5119

C5120

2

CR301

2

D100

2

D102

D105

D106

D202

2

D305

D402

2

D501

2

D511

1

J2

29

28

2

29

30

32

31

J3

L100

L101

L115

L117

L118

L121

L200

L201

L202

L208

L209

L212

L216

L217

L300

L301

L302

L304

L306

L307

L308

L309

L310

L311

L312

L313

L314

L500

L501

L502

M111

M112

M113

M114

1

P2P2

2

Q101

2

Q102

2

Q103

1

2

3

Q105

Q106

Q106

Q200

Q201

Q300

2

Q301

Q303

Q304

2

Q306

2

Q401

Q403

Q404

Q405

Q408

Q409

Q410

Q411

Q412

Q413

Q416

2

Q417

Q501

Q502

Q504

2

Q505

2

Q506

R103

R104

R107

R108

R117

R118

R119

R122

R126

R127

R128

R130

R131

R134

R135

R136

R137

R138

R139

R140

R141

R142

R143

R145

R147

R149

R153

R155

R156

R157

R158

R160

R161

R165

R166

R167

R168

R169

R170

R172

R175

R180

R181

R183

R185

R186

R201

R203

R204

R205

R207

R209

R210

R213

R214

R215

R216

R218

R219

R220

R223

R227

R229

R230

R231

R235

R300

R301

R310

R326

R330

R331

R334

R336

R338

R340

R345

R346

R347

R401

R402

R403

R404

R405

R407

R414

R415

R421

R422

R423

R424

R425

R426

R427

R432

R433

R434

R435

R436

R438

R442

R443

R453

R454

R455

R456

R457

R460

R463

R466

R467

R468

R469

R470

R471

R600

R603

R604

R615

R5002

R5008

R5013

R5014

R5016

R5020

R5023

R5025

R5026

R5027

R5028

R5029

R5030

R5035

R5036

R5037

R5041

R5042

R5049

R5051

R5058

R5059

R5060

R5061

R5062

R5069

R5072

R5076

R5078

R5088

R5103

1

6

54

3

2

S5010

1

SH201

SH300

SH301

SH302

6

4

3

T300

6

4

3

T301

TP1

TP2

TP4

TP150

TP200

TP201

TP400

TP401

TP402

TP403

TP404

TP405

TP406

TP407

TP408

TP409

TP410

TP425

TP425

TP500

TP555

TP556

1

4

5

8

U100

1

4

5

8

U102

87

1

14

U103

11

1

20

10

U201

U302U302

1

4

58

U400

1

76

51

26

U403

32

17 16

1

16

1

8

9

U405

1

4

5

8

U507

U510

U514

2

VR101

2

VR102

2
VR400

VR401

2
VR402

VR502

VR503

2

VR692

2

VR694

2

VR695

2

VR696

2

VR697

2

VR698

2

VR699

Y200

4

3

2

Y201

8488978u01_p9

SHOWN FROM SIDE 2

OL 79B02969C77-O
OL 79B02969C79-O

U404

UHF2 (438-470 MHz) 1-25 W 8488978U01 (rev. P9), Bottom Side

4-6 UHF 1-25 W Band 2 PCB 8488978U01 (rev. P9) / Schematics

Accessory Connector

Control Head Connector

NC

Place capacitors near J2 Place capacitors near J2

Place capacitors near J2

Place capacitors near J2

ELP ONLY

NC ELP ONLY

NC

ELP ONLY

NCELP ONLY

Internal spkr+ jumper

DNPJ3 -

DNPDNP

DNP

DIGITAL

Option Board

Keypad/Display

Accessory Connector
EXT_ALARM_OUT
EXT_MIC_PTT
PROG_IN

PROG_I/O
PROG_I/O
PROG_I/O

TO DC & AUDIO

TO SHEET 1

220

TX AUDIO SEND

DETECTOR AUDIO SEND

TX AUDIO RETURN

UNMUTED RX AUDIO SEND

POST-LIMITER FLAT TX AUDIO RETURN

RX AUDIO RETURN

RESET

DIGITAL 3.3 VOLT SUPPLY

GND

ANALOG 3 VOLT SUPPLY

BACKLIGHT

GND

EXTERNAL_ MIC

VOICE STORAGE AUDIO SELECT

OPTION BOARD ENABLE
DATA READY/REQUEST

SERIAL CLOCK

SERIAL DATA RETURN

SERIAL DATA SEND

PUSH TO TALK

DISPLAY DRIVER CHIP SELECT

KEYPAD ROW

KEYPAD COLUMN

DISPLAY_DRIVER_COMMAND/DATA_SEL

VOICE STORAGE INT
VOICE STORAGE RAC
VOICE STORAGE CS
VOICE STORAGE GAIN SELECT

DISPLAY_DRIVER_CS_EN
SHIFT_REG_CS
DISPLAY_DRIVER_COMMAND/DATA_SEL
KEYPAD_COLUMN
KEYPAD_ROW
SCI_PROGRAMMING

BOOT/RESET

SPI_MOSI

MIC_PTT
HOOK

9.3V

D3_3V

HANDSET_RX_AUDIO

MIC_AUDIO

SPKR­SPKR+

DISPLAY_DRIVER_RESET

SPI_CLK

GND
GND

Option Board Connector

28 Pins Connector

DNP

33.

P1-1

D3_3V

J3-23

23

J3-9

9

VS_GAIN_SEL

VSTBY

3V

0.0

R602

9V

0.

R603

0.

R604

J2-4

4

J2-2

2

19

J2-11

11

J2-14

14

15

J2-20

20

J2-19

J2-7

7

J2-18

18

J2-15

J2-22

G2

J2-12

12

17

J2-5

5

J2-16

16

J2-13

13

J2-21

G1

J2-9

9

J2-8

8

J2-17

J2-6

6

J2-3

3

J2-10

10

J2-1

30

J3-3131J3-32

32

10

FILT_SW_B+

D3_3V

D3_3V

1

5

J3-5

J3-2929J3-30

10

J3-10

13

J3-13

J3-19

18

J3-18

8

J3-8

25

16

J3-16

17

J3-17

2

J3-2

J3-20

20

J3-11

11

15

J3-15

J3-27

27

6

J3-6 J3-28

22

J3-22

1

J3-1

24

28

J3-26

26

J3-24

1n

7

J3-7

J3-14

14

3

J3-3

4

J3-4

0.

R600

19

J3-12

12

J3-21

21

VR692

20.0

J3-25

OPT_DATA_R_OPBD

OPT_EN_OPBD

HOOK_CH

MIC_PTT_CH

RESET

SHIFT_R_CS

VOL_INDIRECT

ONOFF_SENSE

EMERGENCY_SENSE

VOX

BATT_SENSE

BOOT_EN_IN_CH

VS_INT

VS_RAC

VS_CS

VS_AUDIO_SEL

FILT_SW_B+

CH_ACT

ASFIC_CS

SYNTH_LOCK

SYNTH_CS

RSSI

uP_CLK

F1200

SQ_DET

LSIO

HSIO

DISPLAY_CS_CH

COMM_DATA_SEL_CH

KEYPAD_COL_CH

KEYPAD_ROW_CH

SCI_CH

PROG_O-ACC_C_4

PROG_I-ACC_C_3

PROG_IO-ACC_C_14

PROG_I-ACC_C_6

PROG_IO-ACC_C_8

PROG_IO-ACC_C_12

RX_EN

LOC_DIST

TX_EN SPI_MOSISPI_CLK SPI_MISO

D3_3V

20.0

VR692

100.

330.0

R601

9V

R615

C678

100.n

33.

VR693

C662

R610

1n

1n

C633 C632 C631

1n

C6301nC629

1n 1n

C628

1n

1n

C626C627

1n 1n

C625

C624

1n

1n

C622

C623

1n 1n

C621 C620

1n

1n

C618 C619

1n1n

C617C616

1n 1n

C614 C615

1n1n

C613C612C611

1n1n

C610
1n

1n

C609C608C607

1n

1n

C606

1n1n

C605C604C603

1n

C602

1n

VR698

20.0

VR694

20.0

20.0

20.0

VR697

VR699

VR695

20.0

VR696

P1-7

7

P1-13

13

P1-10

P1-14

14

8

P1-12

12

P1-9

9

P1-8

P1-6

6

P1-4

4

P1-3

3

P1-15

15

FILT_SW_B+

5

P1-11

11

2

P1-5

1

P1-16

16

P1-2

DNP

UHF2 (438-470 MHz) 1-25 W Main Circuit (Sht 1 of 2)