Motorola CP185 Basic Service Manual
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Motorola CP185 Basic Service Manual

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  • Page 3 Service Manuals need to be updated accordingly. If you wish to be informed of these updates, kindly fill in and fax us your details. Fax to: 6 6124944 The Technical Publications Coordinator, Global Customer Documentation, R&D Department, Motorola Penang. Your Details Name/Contact Person: Company Name: Address: Telephone No.: Fax No.:...
  • Page 4 Kindly take a few moments to provide feedback on this manual. Thank you for your cooperation. Fax to: 6 6124944 The Technical Publications Coordinator, Global Customer Documentation, R&D Department, Motorola Penang. 1. Please check all the appropriate boxes: Disassembly Procedures Alignment Procedures Exploded...

  • Page 5: Computer Software Copyrights

    © 2008, 2009 by Motorola, Inc. All rights reserved. No part of this manual may be reproduced, transmitted, stored in a retrieval system, or translated into any language or computer language, in any form or by any means, without the prior written permission of Motorola Inc.

  • Page 6: Safety

    Quick Reference Card enclosed with your radio (Motorola Publication part number 68007024011) to ensure compliance with RF energy exposure limits. For a list of Motorola-approved antennas, and other accessories, visit the following web site which lists approved accessories: http://www.motorola.com/business...

  • Page 7: Document History

    DOCUMENT HISTORY The following major changes have been implemented in this manual since the previous edition: Edition Description Date 68007024004-A Initial edition Oct. 2008 68007024004-B Added VHF 136 – 174 MHz information Feb. 2009...
  • Page 8 Notes...

  • Page 9: Table Of Contents

    Table of Contents Table of Contents Copyright ......................i Safety ......................ii Document History ..................iii Chapter 1 Model Charts and Test Specifications ......1-1 Radio Model Information........................ 1-1 Model Chart for UHF2, 435–480 MHz ................... 1-2 Model Chart for VHF, 136–174 MHz .................... 1-3 UHF2 Specifications ........................
  • Page 10 6.4.2.4 Chassis and Front Housing Reassembly............6-14 Torque List ........................... 6-14 Mechanical View and Parts List ....................6-15 6.6.1 CP185 View and Parts List ..................... 6-15 Chapter 7 Troubleshooting Tables ............. 7-1 Error Codes............................ 7-1 Troubleshooting Table for Receiver....................7-2...
  • Page 11 Table of Contents Appendix A Accessories .................A-1 Appendix B Warranty, Service Support, and Replacement Parts ..B-1 Scope of Manual..........................B-1 Warranty ............................B-1 B.2.1 Warranty Period and Return Instructions................B-1 B.2.2 After Warranty Period .......................B-1 B.2.3 Piece Parts ........................B-2 Appendix C Repair Procedures and Techniques – General ....C-1 Glossary of Terms..................
  • Page 12 viii Table of Contents Notes...
  • Page 13 Figure 6-16. Main Circuit Board, O-ring and Battery Contact Seal Reassembly ........ 6-13 Figure 6-17. Sub Circuit Board and Accessory Bracket Reassembly..........6-13 Figure 6-18. Chassis Assembly and Front Housing Assembly Reassembly ........6-14 Figure 6-19. CP185 Exploded View....................6-15...
  • Page 14 Lead Free Solder Wire Part Number List ................ C-1 Table C-2. Lead Free Solder Paste Part Number List............... C-1 Related Publications CP185 Series Radios User Guide (English, French Canadian) ......6878080A01 CP185 Series Radios Quick Reference Card (English, French Canadian)..68007024011 CP185 Series Basic Service Manual............... 68007024004...

  • Page 15: Notations Used In This Manual

    Notations Used in This Manual Notations Used in This Manual Throughout the text in this publication, you will notice the use of the following notations. These notations are used to emphasize that safety hazards exist, and due care must be taken and observed. An operational procedure, practice, or condition that isessential to emphasize.
  • Page 16 Summary of Bands Available Summary of Bands Available Table below lists all the bands available in this manual. For details, please refer to the Model Charts section. Frequency Band Bandwidth Power Level UHF2 435 – 480 MHz 2W or 4W 136 –...

  • Page 17: Chapter 1 Model Charts And Test Specifications

    Chapter 1 Model Charts and Test Specifications Radio Model Information The model number and serial number are located on a label attached to the back of your radio. You can determine the RF output power, frequency band, protocols, and physical packages. The example below shows one portable radio model number and its specific characteristics.

  • Page 18: Model Chart For Uhf2, 435-480 Mhz

    Model Charts and Test Specifications: Model Chart for UHF2, 435–480 MHz Model Chart for UHF2, 435–480 MHz CP185, UHF2, 435 – 480 MHz Model Description CP185 435 – 480M 4W 12.5/25K 16C AAH03RDF8AA7AN Item Description X PMUE3139_ CP185 435 – 480M 4W 12.5/25K 16C X PMDE4023_R 435 –...

  • Page 19: Model Chart For Vhf, 136-174 Mhz

    Model Charts and Test Specifications: Model Chart for VHF, 136–174 MHz Model Chart for VHF, 136–174 MHz CP185, VHF, 136 – 174 MHz Model Description AAH03KEF8AA7AN CP185 136 – 174M 5W 12.5/25K 16C Item Description X PMUD2444_ 136 – 174M 5W 12.5/25K 16CH X PMDD4020_R 136 –174M 5W PCB –...

  • Page 20: Uhf2 Specifications

    UHF2 Specifications UHF2 Specifications General Transmitter UHF2 UHF2 RF Output High Frequency: 435 – 480 MHz NiMH @ 7.5 V: Channel Capacity: 16 Channels Frequency: 435 – 480 MHz 7.5 Volts ±20% Power Supply: Channel Spacing: 12.5/25 kHz Dimensions: Freq. Stability: 0.00025% (H x W x D) (-30°C to +60°C)

  • Page 21: Vhf Specifications

    VHF Specifications VHF Specifications General Transmitter RF Output High Frequency: 136 – 174 MHz NiMH @ 7.5 V: Channel Capacity: 16 Channels Frequency: 136 – 174 MHz 7.5 Volts ±20% Power Supply: Channel Spacing: 12.5/25 kHz Dimensions: Freq. Stability: 0.00025% (H x W x D) (-30°C to +60°C) with...
  • Page 22 Model Charts and Test Specifications: VHF Specifications Notes...

  • Page 23: Chapter 2 Theory Of Operation

    Chapter 2 Theory Of Operation Introduction This chapter provides a basic theory of operation for the radio components. Major Assemblies • Main PCB – contains the RF circuits which comprises receiver, transmitter, phase-locked loop (PLL) frequency synthesizer, micro controller, power supply, audio and digital circuits •...

  • Page 24: Rx Front End

    Theory Of Operation: Major Assemblies 2.2.1.1 RX Front End UHF2 : Receiver Front-end consists of a low pass filter, a pre-selector filter, a low noise RF Amplifier and a Post-selector filter. Incoming RF signal from the antenna is applied through the Harmonics Low Pass Filter (L409 –...

  • Page 25: Rx Squelch

    Theory Of Operation: Major Assemblies 2.2.1.3 RX Squelch The mute (squelch) circuitry switches off the audio amplifier when no audio is detected from the recovered audio. The squelch circuit main components are U202 & U201. U202 will adjust the squelch circuit sensitivity depending on Noise level from recovered audio. Noise level is amplified by internal amplifier of U201 to help U202 decide the squelch circuit sensitivity.

  • Page 26: Phase Lock Loop Synthesizer

    Theory Of Operation: Major Assemblies The APC (Auto Power Control) keeps the current supplied to Final PA (Q403) constant. Resistor, R417 is used for current sensing. The voltage difference ratio of R423 to R417 is amplified through U401 and passed to Q404 and Q405 to produce constant power output to the antenna. Do not exceed the maximum allowed bias voltage of the device.

  • Page 27: Rx Audio Circuit

    Theory Of Operation: Major Assemblies 2.2.4 RX Audio Circuit The RX audio circuit consists of Audio Processor IC, Audio amp, speakers & Sub-tone system. Audio Processor IC (AK2347) RXA1 RX LPF TX/RX HPF Audio IN Scrambler / Expander (from IF IC) Descrambler emphasis pin 24...

  • Page 28: Tx Audio Circuit

    Theory Of Operation: Major Assemblies 2.2.5 TX Audio Circuit The TX audio circuit is comprised of microphones, LPF, Audio Processor IC, and TX Sub-tone system. 4 Order LPF (Fc=4KHz) (Audio IN) Audio Processor IC (AK2347 ) U501-C,D TX/RX HPF TXA1 Com- Pre- Limiter...

  • Page 29: Microcontroller

    Theory Of Operation: Major Assemblies The output audio signal of Audio Processor IC is directed to volume control switch (SW/VOL1) controlled by user and is finally amplified by U601BTL Audio Amplifier to a sufficient level to drive either the external or internal speaker. 2.2.6 Microcontroller The microprocessor or CPU includes Microprocessor (U101), EEPROM and support components.
  • Page 30 Theory Of Operation: Major Assemblies Notes...

  • Page 31: Chapter 3 Test Equipment, Service Aids, And Service Tools

    Chapter 3 Test Equipment, Service Aids, and Service Tools Test Equipment Table 3-1. lists test equipment required to service the radios. Table 3-1. Recommended Test Equipment Motorola Part No. Description Characteristics Application R2600 series System analyzer This item will substitute...

  • Page 32: Service Aids

    Test Equipment, Service Aids, and Service Tools: Service Aids Service Aids Table 3-2. lists service aids recommended for working on the CP185 Series Radios. While all of these items are available from Motorola, most are standard shop equipment items, and any equivalent item capable of the same performance may be substituted for the item listed.

  • Page 33: Figure 3-1. Programming/Test Cable (Pmdn4077_R)

    Test Equipment, Service Aids, and Service Tools: Service Aids Programming/Test Cable 2.5mm stereo USB connection type Figure 3-1. Programming/Test Cable (PMDN4077_R) 2.5mm stereo 2.5mm stereo Figure 3-2. Cloning Cable (PMDN4076_R) VBUS VBUS TX_D To Computor RX_D 2.5mm stereo > 4,5,6 USB_CONNECTOR IC : CP2102 Figure 3-3.
  • Page 34 Test Equipment, Service Aids, and Service Tools: Service Aids Notes...

  • Page 35: Chapter 4 Performance Checks

    Chapter 4 Performance Checks General These radios meet published specifications through their manufacturing process by utilizing high accuracy laboratory-quality test equipment. The recommended field service equipment is as accurate as the manufacturing equipment with few exceptions. This accuracy must be maintained in compliance with the manufacturer’s recommended calibration schedule.
  • Page 36 Performance Checks: LCD/LED/Button/Volume Knob Test Mode Table 4-1. Radio Operation in Test Mode (Continued) Button LCD Indication Backlight Tone SPB1 • ON when button is (Side pressed. Programmable • OFF after a short Button 1) period of inactivity (even if the button is continuously being pressed).

  • Page 37: Chapter 5 Radio Programming And Tuning

    Chapter 5 Radio Programming and Tuning Introduction This chapter provides an overview of the CP185 Series Customer Programming Software (CPS) and ® the CP/EP/P Tuner as designed for use in a Windows 2000/XP/Vista environment. Both cover all the functions of the traditional Radio Service Software (RSS) package.

  • Page 38: Radio Tuning Setup

    Audio Analyzer RX Low Battery Eliminator PMDN4080_R Power Supply RX/TX data Program/Test Cable PMDN4077_R Note: 1. Use PMDN4040BR or higher for tuning the CP185 Series radios as PMDN4040AR cannot be used to perform this function. Figure 5-2. Radio Tuning Setup...

  • Page 39: Initial Test Equipment Control Settings

    Radio Programming and Tuning: Transmitter Alignment Options 5.4.1 Initial Test Equipment Control Settings The initial test equipment control settings are listed in Table 5-1. Table 5-1. Initial Equipment Control Settings Service Monitor Test Set Power Supply Monitor Mode: Power Monitor Impedance: 24 Voltage: 7.5 Vdc RF Attenuation:...

  • Page 40: Transmit High Power Tuning

    Radio Programming and Tuning: Transmitter Alignment Options 5.5.1 Transmit High Power Tuning 1. Click the Read icon to initiate communication with the radio. 2. Under the Alignment menu, select Tx Power, then select High (Figure 5-3. Tx High Power Window (High Power)). 3.

  • Page 41: Transmit Low Power Tuning

    Radio Programming and Tuning: Transmitter Alignment Options 5.5.2 Transmit Low Power Tuning 1. Click the Read icon to initiate communication with the radio. 2. Under the Alignment menu, select Tx Power, then select Low (Figure 5-4. Tx Low Power Window (Low Power)). 3.

  • Page 42: Transmit Modulation Tuning

    Radio Programming and Tuning: Transmitter Alignment Options 5.5.3 Transmit Modulation Tuning There are 2 variations of Transmit Modulation Tuning, namely 12.5 kHz and 25 kHz. Table 5-3. Transmit Modulation Tuning Channel Spacing (kHz) Tuning Range (kHz) 12.5 2.25 ± 0.05 4.5 ±...

  • Page 43: Transmit 25 Khz Modulation Tuning

    Radio Programming and Tuning: Transmitter Alignment Options 5.5.3.2 Transmit 25 kHz Modulation Tuning 1. Under the Alignment menu, select Tx Modulation, then select Mod. 25 kHz (Figure 5-6. Tx Modulation 25 kHz Window). 2. Press PTT Toggle. This will key up the radio at the F1. 3.

  • Page 44: Receiver Tuning

    Radio Programming and Tuning: Receiver Tuning Receiver Tuning There are 4 variations of Receive Squelch Tuning: 12.5 kHz-Band Normal Squelch, 12.5 kHz-Band Tight Squelch, 25 kHz-Band Normal Squelch and 25 kHz-Band Tight Squelch. Table 5-4. Receiver Squelch Tuning Squelch Type Tuning Range (dB) Normal 6 –...

  • Page 45: Receive 12.5 Khz-Band Tight Squelch Tuning

    Radio Programming and Tuning: Receiver Tuning 5.6.2 Receive 12.5 kHz Band Tight Squelch Tuning 1. Under the Alignment menu, select Rx Squelch, then select Squelch 12.5 kHz-band Tight. (Figure 5-8. Rx 12.5 kHz-band Tight Squelch Tuning Window). 2. Apply a RF signal for current frequency point with minimum amplitude, -128 dBm (F1 being the first).

  • Page 46: Receive 25 Khz-Band Normal Squelch Tuning

    5-10 Radio Programming and Tuning: Receiver Tuning 5.6.3 Receive 25 kHz Band Normal Squelch Tuning 1. Under the Alignment menu, select Rx Squelch, then select Squelch 25 kHz-band Normal. (Figure 5-9. Rx 25 kHz-band Normal Squelch Tuning Window). 2. Apply a RF signal for current frequency point with minimum amplitude, -128 dBm (F1 being the first).

  • Page 47: Receive 25 Khz-Band Tight Squelch Tuning

    Radio Programming and Tuning: Receiver Tuning 5-11 5.6.4 Receive 25 kHz Band Tight Squelch Tuning 1. Under the Alignment menu, select Rx Squelch, then select Squelch 25 kHz-band Tight. (Figure 5-10. Rx 25 kHz-band Tight Squelch Tuning Window). 2. Apply a RF signal for current frequency point with minimum amplitude, -128 dBm (F1 being the first).

  • Page 48: Utilities

    5-12 Radio Programming and Tuning: Utilities Utilities 5.7.1 Program Serial No. The Program Serial No. option under the Utilities heading allow the radio serial number to be programmed. However, the serial number of a particular radio can only be programmed if it was originally blank.

  • Page 49: Editing Front Panel Programming Mode Parameters

    Radio Programming and Tuning: Front Panel Feature and Button Configuration Mode 5-13 Press Side Programmable Button 1 to either return to previous menu level or to exit the selection parameter without change. 5.8.5 Editing Front Panel Programming Mode Parameters Table 5-5. Front Panel Programming Mode Parameters 1st Level 2nd Level Main Menu...
  • Page 50 5-14 Radio Programming and Tuning: Front Panel Feature and Button Configuration Mode Table 5-5. Front Panel Programming Mode Parameters (Continued) 1st Level 2nd Level Main Menu Setting Remarks Sub-Menu Sub-Menu TX PL CH-001 ... Transmit PL (Transmit TPL/ CH-016 TPL 067.0 001 ...

  • Page 51: Chapter 6 Maintenance - Cp185

    Chapter 6 Maintenance – CP185 Introduction This section provides details about the following: • Preventive maintenance (inspection and cleaning) • Safe handling of CMOS and LDMOS devices • Disassembly and reassembly of the radio • Repair procedures and techniques •...

  • Page 52: Safe Handling Of Cmos And Ldmos Devices

    • Wear a conductive wrist strap in series with a 100k resistor to ground. (Replacement wrist straps that connect to the bench top covering are Motorola part number 4280385A59.) •...

  • Page 53: Disassembling And Reassembling The Radio - General

    If a unit requires further testing or service than is customarily performed at the basic level, please send the unit to a Motorola Authorized Service Center listed in Appendix B. Note: Numbers in parentheses ( ) refer to item numbers in Figure 6-19, on page 6-15.

  • Page 54: Radio Disassembly - Detailed

    Maintenance – CP185: Disassembling and Reassembling the Radio – General 6.4.1 Radio Disassembly – Detailed 6.4.1.1 Front Housing From Chassis Disassembly 1. Turn off the radio. 2. Remove the Battery (31): Release the battery latch by moving it into the unlock position.

  • Page 55: Figure 6-3. Knobs Removal

    Maintenance – CP185: Disassembling and Reassembling the Radio – General 4. Remove the Volume Knob (7) and Channel Knob (8) from their shafts using the Chassis and Knob Opener. (Refer Figure 6-3). Volume Knob Channel Knob Chassis and Knob Opener Figure 6-3.

  • Page 56: Figure 6-5. Speaker Wire And Flexible Cable Connection

    Maintenance – CP185: Disassembling and Reassembling the Radio – General Slide the rear chassis downwards, and away from the front housing. Be careful not to damage the Flexible Cable (39) and speaker wire underneath. (Refer Figure 6-5). Speaker Wire Flexible Cable Figure 6-5.

  • Page 57: Chassis Assembly Disassembly

    Maintenance – CP185: Disassembling and Reassembling the Radio – General Push the latches on the Front Circuit Board (41) sideways to the right to release the flexible cable from the connector. (Refer Figure 6-7). Latches Figure 6-7. Unlatch the Flexible Cable 6.4.1.2 Chassis Assembly Disassembly...

  • Page 58: Front Circuit Board, Display Module And Keypad Disassembly

    Maintenance – CP185: Disassembling and Reassembling the Radio – General 7. Remove the Main Circuit Board from the Chassis. Refer to the CMOS CAUTION paragraph under Section 6.3 before removing the main board. Be sure to use ESD protection when handling the circuit boards.

  • Page 59: Speaker Disassembly

    Maintenance – CP185: Disassembling and Reassembling the Radio – General 4. Remove the LCD (38), Poron Pad (44) and Keypad (43) from the Front Housing. (Refer Figure 6-11). Keypad Poron Pad Figure 6-11. LCD and Keypad Removal Note: The poron pad will be damaged during disassembly. A new poron pad is needed for reassembly.

  • Page 60: Figure 6-12. Speaker Removal

    6-10 Maintenance – CP185: Disassembling and Reassembling the Radio – General 5. Remove the Speaker Felt (9) from the grille area. (Refer Figure 6-12). Speaker Retainer Speaker Insulator Speaker Speaker Felt Figure 6-12. Speaker Removal...

  • Page 61: Radio Reassembly - Detailed

    Maintenance – CP185: Disassembling and Reassembling the Radio – General 6-11 6.4.2 Radio Reassembly – Detailed 6.4.2.1 Speaker Reassembly 1. Place the Speaker Felt (9) onto the grille area. 2. Align the speaker wire at three o'clock position and push down the speaker until fully adhere onto the front housing.

  • Page 62: Chassis Assembly Reassembly

    6-12 Maintenance – CP185: Disassembling and Reassembling the Radio – General 3. Place the Front Circuit Board (41) straight down on top of the LCD and keypad. Align the front circuit board to the four housing ribs. Press the top right edge of the front circuit board to ensure the microphone sealing rubber is fully seated in place.

  • Page 63: Figure 6-16. Main Circuit Board, O-Ring And Battery Contact Seal Reassembly

    Maintenance – CP185: Disassembling and Reassembling the Radio – General 6-13 5. Tighten the RF Support Screw (20) with a flat head screw torque to 1.91 Ib-in – 2.17 Ib-in. (Refer Table 6-1 on page 6-14 for torque in other units).

  • Page 64: Chassis And Front Housing Reassembly

    6-14 Maintenance – CP185: Torque List 6.4.2.4 Chassis and Front Housing Reassembly 1. Assembly the chassis assembly to the Front Housing Assembly (1) as follow: Lay the chassis assembly beside to the Front Housing Assembly. Insert the Flexible Cable (39) from the main circuit board into the connector on the front circuit board.

  • Page 65: Mechanical View And Parts List

    Maintenance – CP185: Mechanical View and Parts List 6-15 Mechanical View and Parts List 6.6.1 CP185 View and Parts List Figure 6-19. CP185 Exploded View...
  • Page 66 6-16 Maintenance – CP185: Mechanical View and Parts List Item Motorola Kit Number Description Quantity PMDN4097_R Front Housing, Limited Keypad PMDN4096_R Name Plate (CP185) PMDN4124_R Double Molded Cover, PTT PMDN4089_R Seal, Volume and Channel Knob PMDN4088_R Adhesive, Top Control PMDN4103_R...
  • Page 67 Maintenance – CP185: Mechanical View and Parts List 6-17 Item Motorola Kit Number Description Quantity PMDN4107_R Screw, Machine PMDN4123_R Module, Liquid Crystal Display PMDN4109_R Flexible Cable, Main Circuit Board PMDN4119_R Screw, Tapping PMDN4131_R Front Circuit Board, LKP ‡ PMDN4113_R Cover, Dust...
  • Page 68 6-18 Maintenance – CP185: Mechanical View and Parts List Notes...

  • Page 69: Chapter 7 Troubleshooting Tables

    Check the connection between source and destination between source and radios. destination radios failed. Make sure follow the correct cloning procedures. If message reoccurs, send radio to nearest Motorola Service Centre. TIME OUT Time Out Error – No Check the connection between source and destination communication between radios.

  • Page 70: Troubleshooting Table For Receiver

    Radio Dead; Display Does 1. Dead Battery Replace with charged battery. Not Turn On 2. On/Off Switch Send radio to nearest Motorola Service Centre. 3. Regulators 4. Regulator fault Radio Dead; Display Turns Transceiver Board Send radio to nearest Motorola Service Centre.

  • Page 71: Troubleshooting Table For Transmitter

    No RF Power Out 1. Tx Power Level or Check Tx power level and frequency programming (from Frequency tuner). 2. No Injection To Power Send radio to nearest Motorola Service Centre. Amplifier 3. Antenna Switch/ Connector No Modulation; Distortion 1. Programming...
  • Page 72 Troubleshooting Tables: Troubleshooting Table for Transmitter Notes...

  • Page 73: Appendix A Accessories

    Appendix A Accessories Antennas NAD6502_R VHF Heliflex Antenna (146 – 174 Mhz) PMAD4049_ VHF Helical Antenna (146 – 174 MHz) NAE6483_R UHF Whip Antenna, 16.5 cm (403 – 520 MHz) PMAE4016_ UHF Whip Antenna (403 – 520 MHz) Audio Accessories AARLN4885_ Receive Only Earbud for Remote Speaker Microphone Only 3.5 mm Adapter HMN9013_...

  • Page 74: Belt Clip

    90 – 264 V, SMPS with NA/LA country plug PMLN5228_R Tri-Chem Single Unit Charger base PMLN5398_ Single Unit Charger Base with switch mode power supply (Kit) Note: Certain accessories may not be available at the time of publication. For latest information on accessories, visit: http://www.motorola.com/business.

  • Page 75: Appendix B Warranty, Service Support, And Replacement Parts

    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.

  • Page 76: Piece Parts

    Technical Services (MTS). If no part number is assigned, the part is not normally available from Motorola. If the part number is appended with an asterisk, the part is serviceable by Motorola Depot only. If a parts list is not included, this generally means that no user-serviceable parts are available for that kit or assembly.

  • Page 77: Appendix C Repair Procedures And Techniques - General

    When damaged parts are replaced, identical parts should be used. If the identical replacement part is not locally available, check the parts list for the proper Motorola part number and order the part from the nearest Motorola Communications parts center listed in the “Piece Parts” section of this manual.
  • Page 78 Repair Procedures and Techniques – General Rigid Circuit Boards This 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 printed-through holes may interconnect multiple layers of the printed circuit. Therefore, exercise care to avoid pulling the plated circuit out of the hole.
  • Page 79 Repair Procedures and Techniques – General Shields Removing and replacing shields is recommended to be done with the Air Blower, BOSCH GHG 603 or equivalent. • To remove the shield: Place the circuit board in the circuit board holder. Add solder paste flux around the base of the shield. Position the heat-focus head onto the shield.
  • Page 80 Repair Procedures and Techniques – General Notes...

  • Page 81: Glossary Of Terms

    Micro Controller Unit MRTI Motorola Radio-Telephone Interconnect: a system that provides a repeater connection to the Public Switched Telephone Network (PSTN). The MRTI allows the radio to access the telephone network when the proper access code is received.
  • Page 82 Term Definition ® Private-Line tone squelch: a continuous sub-audible tone that is transmitted along with the carrier. Phase-Locked Loop: a circuit in which an oscillator is kept in phase with a reference, usually after passing through a frequency divider. Push-To-Talk: the switch located on the left side of the radio; when pressed, causes the radio to transmit.

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