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Professional Radio GP Series Detailed Service Manual 6866558D03-O...
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Professional Radio GP Series Detailed Service Manual 6866558D03-O Contents Section 1 Service Maintainability Section 2 Keypad Service Information Section 3 Power Distribution and Controller Information Section 4 UHF1 Service Information Section 5 UHF2 Service Information Section 6 800MHz Service Information KTT EMEA Publications Department, Jays Close, Viables Industrial Estate, Basingstoke, Hampshire, RG22 4PD, UK.
Read this information before using the radio. PRODUCT SAFETY AND RF EXPOSURE FOR PORTABLE TWO-WAY RADIOS. This document provides information and instructions for the safe and efficient operation of Motorola Portable Two-Way Radios. The information provided in this document supersedes information contained in user guides published prior to February 2002.
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Compliance with RF Exposure Standards Your Motorola two-way radio is designed and tested to comply with a number of national and International standards and guidelines (listed below) for human exposure to radio frequency electromagnetic energy. This radio complies with the IEEE (FCC) and ICNIRP exposure limits for occupational/controlled RF exposure environments at operating duty factors of up to 50% talk- 50% listen and is authorized by the IEEE/ICNIRP for occupational use only.
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Motorola - approved antennas, batteries and accessories may exceed IEEE/ICNIRP RF exposure guidelines. For a list of Motorola-approved antennas, batteries, and other accessories please see your dealer or local Motorola contact. Your nearest dealer can be found at the following web site: http://www.motorola.com/cgiss/emea/dealerlocator.html Additional Information For additional information on exposure requirements or other training information, visit http://www.motorola.com/rfhealth.
viii ELECTROMAGNETIC INTERFERENCE/COMPATIBILITY NOTE: Nearly every electronic device is susceptible to electromagnetic interference (EMI) if inadequately shielded, designed or otherwise configured for electromagnetic compatibility. Facilities To avoid electromagnetic interference and/or compatibility conflicts, turn off your radio in any facility where posted notices instruct you to do so. Hospitals or health care facilities may be using equipment that is sensitive to external RF energy.
OPERATIONAL WARNINGS Vehicles with an air bag Refer to vehicle manufacturer's manual prior to installation of electronic equipment to avoid interference with air bag wiring. WARNING: Do not place a portable radio in the area over an air bag or in the air bag deployment area.
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Warnings for Radios Approved as Intrinsically Safe Radios must ship from the Motorola manufacturing facility with the hazardous atmosphere capability and the intrinsic safety approval labelling (FM, UL, CSA, CENELEC or ATEX). Radios will not be upgraded to this capability and labeled once they have been shipped to the field.
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The manual PN referenced on the Intrinsically Safe Approval Label identifies the approved Accessories and or options that can be used with that portable radio unit. Using a non Motorola intrinsically safe battery and or accessory with the Motorola approved radio unit will void the intrinsically safe approval of that radio unit.
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Professional Radio GP Series UHF2 (450 - 527MHz) Service Information Issue: November 2004...
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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...
MODEL CHART AND TECHNICAL SPECIFICATIONS Technical Specifications Data is specified for +25°C unless otherwise stated. General Specifications Channel Capacity GP640 16 (Conventional) GP680 16 (Conventional) GP1280 16 (Conventional) Power Supply Rechargeable battery 7.5v Dimensions: H x W x D (mm) Height excluding knobs GP640/680 With standard high capacity NiMH battery 137 x 57.5 x 37.5...
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Technical Specifications Transmitter UHF2 *Frequencies - Full Bandsplit 450-527 MHz Channel Spacing 12.5/20/25 kHz Frequency Stability ±2.5 ppm (-25°C to +55°C, +25° Ref.) Power 450 - 527 MHz: 1-4W ±2.5 @ 12.5 kHz Modulation Limiting ±4.0 @ 20 kHz ±5.0 @ 25 kHz FM Hum &...
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MODEL CHART AND TECHNICAL SPECIFICATIONS...
Chapter 2 THEORY OF OPERATION Introduction This Chapter provides a detailed theory of operation for the UHF circuits in the radio. For details of the theory of operation and trouble shooting for the the associated Controller circuits refer to the Controller Section of this manual.
THEORY OF OPERATION The LDMOS PA is capable of supplying an output power of 7W with an input signal of 0.3W. The current drain is typically 1300mA while operating in the frequency range of 450-527MHz. The power output can be varied by changing the bias voltage. Antenna Switch The antenna switch circuit consists of two pin diodes (CR101 and CR102), a pi network (C107, L104 and C106), and two current limiting resistors (R101 and R170).
UHF Receiver (all models except those with PCB 8486686Z02) UHF Receiver (all models except those with PCB 8486686Z02) The UHF receiver consists of a front end, back end, and automatic gain control circuits. A block diagram of the receiver is shown in Figure 2-2. Detailed descriptions of these features are contained in the paragraphs that follow.
THEORY OF OPERATION The output of the bandpass filter is coupled to the RF amplifier transistor Q301 via C307. After being amplified by the RF amplifier, the RF signal is further filtered by a second varactor tuned bandpass filter, consisting of L306, L307, C313, C317, CR304 and CR305. Both the pre and post-RF amplifier varactor tuned filters have similar responses.
UHF Receiver (all models except those with PCB 8486686Z02) Automatic Gain Control (AGC) ( Refer to the UHF Receiver Front End and Receiver Back End schematic diagrams ) The front end automatic gain control circuit provides automatic reduction of gain, of the front end RF amplifier via feedback.
THEORY OF OPERATION UHF Receiver (Models with PCB 8486686Z02) The UHF receiver consists of a front and back end. A block diagram of the receiver is shown in Figure 2-3. Detailed descriptions of these features are contained in the paragraphs that follow. Antenna Pin Diode Varactor...
UHF Receiver (Models with PCB 8486686Z02) The output of the bandpass filter is coupled to the RF amplifier transistor Q301 via C307. After being amplified by the RF amplifier, the RF signal is further filtered by a second varactor tuned bandpass filter, consisting of L306, L307, C313, C317, CR304 and CR305.
THEORY OF OPERATION Frequency Generation Circuit ( Refer to Figure 2-4 and the UHF Frequency Synthesizer schematic diagram ) The frequency generation circuit, shown in Figure 2-4, is composed of Fractional-N synthesizer U201 and VCO/Buffer IC U241. Designed in conjunction to maximize compatibility, the two ICs provide many of the functions that normally require additional circuitry.
Frequency Generation Circuit Synthesizer ( Refer to Figure 2-5 and the UHF Synthesizer schematic diagram) The Fractional-N synthesizer, shown in Figure 2-5, uses a 16.8MHz crystal (FL201) to provide a reference for the system. The LVFractN IC (U201) further divides this to 2.1MHz, 2.225MHz, and 2.4MHz to be used as reference frequencies.
2-10 THEORY OF OPERATION Voltage Controlled Oscillator (VCO) ( Refer to Figure 2-6 and the UHF Voltage Controlled Oscillator schematic diagram) The VCOB IC (U241), shown in Figure 2-6, in conjunction with the Fractional-N synthesizer (U201) generates RF in both the receive and the transmit modes of operation. The TRB line (U241 pin 19) determines which oscillator and buffer are enabled.
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Frequency Generation Circuit 2-11 Table 2-1 Level Shifter Logic Desired AUX 4 AUX 3 Mode High (@3.2V) High (@4.8V) High Battery Saver Hi-Z/Float (@2.5V) In the receive mode, U241 pin 19 is low or grounded. This activates the receive VCO by enabling the receive oscillator and the receive buffer of U241.
2-12 THEORY OF OPERATION Voice Storage (GP1280 Only) ( Refer to Figure 2-7 and the UHF Voice Storage schematic diagram) The Voice Storage feature is offered as standard in the GP1280 and as an Option board for GP340/GP360/GP380 and GP640/GP680 models. The Voice Storage feature enables users to: ■...
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Voice Storage (GP1280 Only) 2-13 Audio routing to the Voice Storage circuitry during receive message recording, message playback, personal memo recording and voice prompt transmit over the air are as follows: Received Message Recording The receive audio is tapped from the Rx_Aud_Rtn pin of the ASFIC_CMP during receive mode. Message Playback Message playback is via the FLAT_RX_SND pin of ASFIC_CMP.
Chapter 3 TROUBLESHOOTING CHARTS Troubleshooting Flow Chart for Receiver (All models except those with PCB 8486686Z02) (Sheet 1 of 2) START Bad SINAD Bad 20dB Quieting No Recovered Audio udio Check Controller at pin 27 of U301? Spray of inject 1st IF into XTAL Filter IF Freq: 45.1MHz Check Q320 bias...
TROUBLESHOOTING CHARTS Troubleshooting Flow Chart for Receiver (All models except those with PCB 8486686Z02) (Sheet 2 of 2) Inject RF into J101 Q302 Trace IF signal collector OK? IF Signal from L311 to IF signal at L311? Q302. Check for present? bad XTAL filter.
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Troubleshooting Flow Chart for Receiver (Models with PCB 8486686Z02) (Sheet 1 of 2) Troubleshooting Flow Chart for Receiver (Models with PCB 8486686Z02) (Sheet 1 of 2) START Bad SINAD Bad 20dB Quieting No Recovered Audio Check Controller Audio at pin 8 of U301? Spray or inject 1st IF 44.85 MHz into...
TROUBLESHOOTING CHARTS Troubleshooting Flow Chart for Receiver (Models with PCB 8486686Z02) (Sheet 2 of 2) Inject RF into J101 Trace IF signal Q302 collec- from L311 to IF Signal at tor OK? Q302. Check for L311? IF signal bad XTAL filter. present? Before replacing U301, check...
Troubleshooting Flow Chart for Transmitter Troubleshooting Flow Chart for Transmitter START No Power Is There B+ Bias for Check Q111 Ant switch CR101 Is Control Voltage Is Current Check PCIC High or Low at C119 High 1. Check Pin Diodes Check Drive to 2.
TROUBLESHOOTING CHARTS Troubleshooting Flow Chart for Receive Message/Personal Memo Recording Cannot Receive Message Personal Memo Recording Check menu Turn on Check Mic I/P at whether record “Record Incoming J403-18 any audio? incoming messages Call” turned on Check Spkr/Mic Flex Connection J403 Check J400-34 Any audio?
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Chapter. The Voice Storage facility may be fitted to other radios in the GP Series as an option board; reference must be made to the Option Board manual in this case. The Voice Storage schematic and the related PCBs are shown in Tables 4-3 and 4-4 below.
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UHF2 PCB/SCHEMATICS/PARTS LISTS Table 4-3 UHF2 GP1280 Drawings and Parts Lists PCB : 8485677Z02 Main Board Top Side Page 4-27 Main Board Bottom Side Page 4-28 SCHEMATICS Controls and Switches Page 4-5 Receiver Front End Page 4-6 Receiver Back End Page 4-7 Synthesizer Page 4-8...
UHF2 PCB8485641Z06 Parts List 4-23 UHF2 PCB8485641Z06 Parts List Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Part No. Part No. Part No. Circuit Motorola Description C170 2113743N50 100pF C257 2113743N50 100pF C324 2113743N33 20pF Part No. C171 2113743N50...
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UHF2 PCB8485641Z06 Parts List 4-24 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C385 2113743N44 56pF C448 2113928N01 0.1uF , 10% CR201 4802233J09 Triple diode (SOT 25) L114...
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UHF2 PCB8485641Z06 Parts List 4-25 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. Q210 4802245J50 Dual NPN/PNP transistor R233 0662057M68 R338 NOT PLACED R448 0662057M98 Q241 4805218N63 RF NPN transistor...
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UHF2 PCB8485641Z06 Parts List 4-26 * Motorola Depot Servicing only Circuit Motorola Description Reference designators with an asterisk indicate Part No. components which are not fieldreplaceable SH402 2680515Z01 Microprocessor shield because they need to be calibrated with SH403 2680516Z01 Asfic_Cmp/Audio PA shield specialized factory equipment after installation.
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Voice Storage Parts List (GP1280) 4-30 Voice Storage Parts List (GP1280) * Motorola Depot Servicing only Reference designators with an asterisk indicate components which are not fieldreplaceable Circuit Motorola Description because they need to be calibrated with Part No. specialized factory equipment after installation.
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UHF PCB 8486686Z02 Parts List 4-48 11.0 UHF PCB 8486686Z02 Parts List Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Part No. Part No. Part No. Circuit Motorola Description C170 2113743N50 100pF C258 2113743L41 10000pF C326 2113743M24 100000pF Part No.
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UHF PCB 8486686Z02 Parts List 4-49 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C410 2113928N01 0.1uF C482 2113928N01 0.1uF CR501 4880107R01 Rectifier L261 2462587V29 39nH C411 2113743M24...
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UHF PCB 8486686Z02 Parts List 4-50 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. R104 0662057N15 R309 0662057M01 R405 0662057M01 R481 0662057N08 R106 0662057M26 R310 NOTPLACED R406 0662057N20...
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455kHz Ceramic Discriminator 1485777Z01 Insulator (KAPTON) 8486686Z02 UHF B2 PC Board * Motorola Depot Servicing only Reference designators with an asterisk indicate components which are not fieldreplaceable because they need to be calibrated with specialized factory equipment after installation. Radios in which these parts have been replaced in the field will be off frequency at temperature extremes.
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UHF PCB 8486686Z02 Parts List 4-52 Intentionally Left Blank...
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Professional Radio GP Series Service Maintainability Issue: November 2004...
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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...
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Table of Contents Chapter 1 INTRODUCTION 1.0 Scope of Manual ....................1-1 2.0 Warranty and Service Support................1-1 2.1 Warranty Period and Return Instructions ............1-1 2.2 After Warranty Period ..................1-1 2.3 European Radio Support Centre (ERSC)............1-2 2.4 Piece Parts .....................1-2 2.5 Technical Support...................1-3 2.6 Related Documents ..................1-3 3.0 Radio Model Information..................1-4 Chapter 2...
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.
Aftermarket and Accessory Division (AAD). If no part number is assigned, the part is not normally available from Motorola. If the part number is appended with an asterisk, the part is serviceable by Motorola Depot only. If a parts list is not included, this generally means that no user-serviceable parts are available for that kit or assembly.
Warranty and Service Support Technical Support Motorola Product Services is available to assist the dealer/distributors in resolving any malfunctions which may be encountered. UK/Ireland - Richard Russell France - Lionel Lhermitte Telephone: +44 (0) 1256 488 082 Telephone: +33 1 6929 5722...
INTRODUCTION 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. Table 1-1 Radio Model Number (Example: MDH25KDC9AA3AE) Type of Model...
Chapter 2 MAINTENANCE Introduction This chapter of the manual describes: ❏ preventive maintenance ❏ safe handling of CMOS devices ❏ repair procedures and techniques Preventive Maintenance The radios do not require a scheduled preventive maintenance program; however, periodic visual inspection and cleaning is recommended. Inspection Check that the external surfaces of the radio are clean, and that all external controls and switches are functional.
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”...
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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 mini-thermojet hand piece. On either unit, adjust the temperature control to 370 °C (700 °F), and adjust the airflow to a minimum setting.
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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: Place the circuit board in the R1070 circuit board holder. Select the proper heat focus head and attach it to the heater chimney.
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 µF choke in series with the voltage probe to prevent circuit loading.
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.
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SERVICE AIDS Table 3-2 lists the recommended tools used for maintaining this family of radios. These tools are also available from Motorola.. Table 3-2 Recommended Test Tools Motorola Part Description Application Number 6680702Z01 Chassis opener and knob Disassembly tool removal tool.
Test Equipment Test Equipment Table 3-3 lists test equipment required to service the radio and other two-way radios. Table 3-3 Recommended Test Equipment Motorola Part Description Characteristics Application Number R2600_ Comms System Analyzer This monitor will Frequency/deviation meter and (non MPT).
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SERVICE AIDS Motorola Part Description Characteristics Application Number * R1440_ Wattmeter, Thruline 50-Ohm, Transmitter power output ±5% accuracy measurements. * 0180305F14 Plug-in Element 10W, 25 - 60MHz * 0180305F29 Plug-in Element 5W, 100-250MHz * 0180305F38 Plug-in Element 5W, 200-500MHz * 0180305F46...
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Professional Radio GP Series Keypad and Flex Service Information Issue: November 2004...
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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...
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Table of Contents Chapter 1 THEORY OF OPERATION 1.0 Keypad and Flexible Connectors .................1-1 1.1 Keypad ......................1-1 1.2 Flexible Connectors..................1-1 2.0 Troubleshooting Chart ..................1-2 Chapter 2 PCB / SCHEMATICS / PARTS LISTS 1.0 Allocation of Schematics and Circuit Boards ............2-1 1.1 Flexible Connectors..................2-1 1.2 Keypad PCBs ....................2-1 2.0 PCB/Schematic Diagrams and Parts List: Flexes..........2-3...
Chapter 1 THEORY OF OPERATION Keypad and Flexible Connectors Keypad The keypad block diagram is shown in Figure 1-1. U602 is a comparator that will compare the voltage when any one of the keypad row or keypad column keys is being pressed. Therefore when a key is being pressed, it will send a message to the microprocessor through the output (KEY_INT) telling it that a key has been pressed.
THEORY OF OPERATION Troubleshooting Chart Disconnect and Display reconnect 18-pin flex if still Off Disconnect and Keypad reconnect 40-pin flex Figure 1-2 Keypad Board Troubleshooting Chart...
Chapter 2 PCB / SCHEMATICS / PARTS LISTS Allocation of Schematics and Circuit Boards The printed circuit boards (PCB) and schematic diagrams related to the Flexible Connectors and the Keypads are shown in the tables below: Flexible Connectors Table 2-1: Keypad /Controller Flex Flex : 8480475Z02 Flex...
2-10 PCB/Schematic Diagrams and Parts List: Keypad PCB 8480682Z04 - Parts List Circuit Motorola Description Part No. Circuit Motorola Description Q604 4813824A10 NPN 40V .2A GEN PURP Part No. Q605 4813824A10 NPN 40V .2A GEN PURP C601 2113743N50 100 PF 5%...
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Professional Radio GP Series Power Distribution and Controller Service Information Issue: November 2004...
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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...
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Table of Contents Chapter 1 THEORY OF OPERATION 1.0 Overview ......................1-1 2.0 Radio Power Distribution ..................1-1 3.0 Controller Circuits ....................1-2 3.1 Controller Architecture..................1-2 3.2 MCU Digital Architecture ................1-2 3.3 Real Time Clock .....................1-3 3.4 ModB/Vstby Supply ..................1-4 3.5 Audio/Signaling Architecture ................1-4 Chapter 2 TROUBLESHOOTING CHARTS 1.0 UHF/ UHF2 Controller..................2-1...
Chapter 1 THEORY OF OPERATION Overview This Chapter provides a detailed theory of operation for the power distribution and controller circuits in the radio. The components for these circuits are contained on the Main Board. Refer to the RF sections of this manual for the component location details and the parts lists for these circuits. Radio Power Distribution Accessories 20 pin Connector...
THEORY OF OPERATION Controller Circuits Controller Architecture The controller board is the central interface between the various subsystems of the radio. It is separated into MCU digital and audio/signalling architectures as shown in Figure 1-2. External Microphone To Synthesizer Internal Microphone 16.8 MHz Reference Clock...
THEORY OF OPERATION A MOSFET Q416 switches in the LiO supply when Vdd is removed. Q416 also provides isolation from BOOT_CTRL function in the event of radio program flashing. The 3.3V regulator charges the Lithium battery. ModB/Vstby Supply The supply to the ModB/Vstby pin varies depending on the conditions listed in Table 1-2. Table 1-2 ModB/Vstby Supply Modes Condition Circuit Operation...
Chapter 2 TROUBLESHOOTING CHARTS UHF/ UHF2/ 800MHz Controller All models except those with PCB 8486458Z03 MCU Check Press PTT. Red LED does not Before replacing light up Power Up Not able to pro- MCU, check SPI Alert Tone gram RF Board AUDIO Audio at clock, SPI data,...
TROUBLESHOOTING CHARTS Models with PCB 8486458Z03 MCU Check Press PTT. Red LED does not Before replacing light up Not able to pro- Power Up MCU, check SPI gram RF Board AUDIO Audio at Alert Tone clock, SPI data, J403 Audio AudioPA and RF IC select at Pin 2 &...
Chapter 3 CONTROLLER SCHEMATICS Allocation of Schematics and Circuit Boards The Controller circuits are contained on the printed circuit board (PCB) containing the RF circuits. This Chapter shows the schematics for the Controller circuits only, refer to the relevant RF section for details of the related RF circuits, the PCB component layouts and the Parts Lists.
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3-20 Controller - Set 3 (PCB 8486458Z03, 8486686Z02) Intentionally left blank...
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Professional Radio GP Series UHF (403 - 470MHz) Service Information Issue: November 2004...
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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...
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Table of Contents Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS 1.0 GP320/GP340/GP360/GP380 Model Chart............1-1 2.0 GP140 Model Chart .....................1-2 3.0 GP640/GP680 Model Chart .................1-2 4.0 GP1280 Model Chart ...................1-3 5.0 GP240/GP280/GP540/GP580 Model Chart............1-4 6.0 Technical Specifications ..................1-5 Chapter 2 THEORY OF OPERATION 1.0 Introduction ......................2-1 2.0 UHF Transmitter ....................2-1 2.1 Power Amplifier ....................2-1...
MODEL CHART AND TECHNICAL SPECIFICATIONS GP140 Model Chart Professional GP140 (UHF) Model Description MDH25RDC9AA3_E GP140 UHF 403-470 MHz 4W 16 Ch Item Description PMLE4130_ *GP140 UHF Back Cover Kit 6864110B25 GP140 Basic User Guide NAE6483_ UHF Whip (403-470 MHz) Antenna HNN9008_ Battery, NiMH Standard x = Indicates one of each is required.
GP1280 Model Chart GP1280 Model Chart Professional GP1280 (UHF) Model Description MDH25RDN9CK8_E GP1280 UHF 403-470 MHz 4W Item Description PMLE4142_ *GP1280 UHF Back Cover Kit 6864110B20 GP1280 Basic User Guide NAE6483_ UHF Whip (403-470 MHz) Antenna HNN9008_ Battery, NiMH Standard x = Indicates one of each is required.
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MODEL CHART AND TECHNICAL SPECIFICATIONS GP240/GP540/GP280/GP580 Model Chart Professional GP200/GP500 Series (UHF) Model Description MDH25RDC9GC3 GP540 UHF 403-470 MHz 4W MDH25RDH9GC6 GP580 UHF 403-470 MHz 4W MDH25RDC9GB3 GP240 UHF 403-470 MHz 4W MDH25RDH9GB6 GP280 UHF 403-470 MHz 4W Item Description *PMLE4192_ GP240/GP540 UHF Back Cover Kit *PMLE4193_...
Technical Specifications Technical Specifications Data is specified for +25°C unless otherwise stated. General Specifications Channel Capacity GP140 GP240, GP280 128 in conventional Mode GP320 GP340 GP360, GP380 GP540, GP580 128 in conventional Mode GP640, GP680, GP1280 16 (Conventional) Power Supply Rechargeable battery 7.5v Dimensions: H x W x D (mm) Height excluding knobs GP140/GP240/320/340/360/380/...
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MODEL CHART AND TECHNICAL SPECIFICATIONS Transmitter *Frequencies - Full Bandsplit UHF 403-470 MHz Channel Spacing 12.5/20/25 kHz Frequency Stability ±1.5 ppm (-25°C to +55°C, +25° Ref.) Power 403 - 470 MHz:1-4W ±2.5 @ 12.5 kHz Modulation Limiting ±4.0 @ 20 kHz ±5.0 @ 25 kHz FM Hum &...
Chapter 2 THEORY OF OPERATION Introduction This Chapter provides a detailed theory of operation for the UHF circuits in the radio. For details of the theory of operation and trouble shooting for the the associated Controller circuits refer to the Controller Section of this manual.
THEORY OF OPERATION The LDMOS PA is capable of supplying an output power of 7W with an input signal of 0.3W. The current drain is typically 1300mA while operating in the frequency range of 403-470MHz. The power output can be varied by changing the bias voltage. Antenna Switch The antenna switch circuit consists of two pin diodes (CR101 and CR102), a pi network (C107, L104 and C106), and two current limiting resistors (R101 and R170).
UHF Receiver (all models except those with PCB 8486458Z03) UHF Receiver (all models except those with PCB 8486458Z03) The UHF receiver consists of a front end, back end, and automatic gain control circuits. A block diagram of the receiver is shown in Figure 2-2. Detailed descriptions of these features are contained in the paragraphs that follow.
THEORY OF OPERATION The output of the bandpass filter is coupled to the RF amplifier transistor Q301 via C307. After being amplified by the RF amplifier, the RF signal is further filtered by a second varactor tuned bandpass filter, consisting of L306, L307, C313, C317, CR304 and CR305. Both the pre and post-RF amplifier varactor tuned filters have similar responses.
UHF Receiver (all models except those with PCB 8486458Z03) Automatic Gain Control (AGC) ( Refer to the UHF Receiver Front End and Receiver Back End schematic diagrams ) The front end automatic gain control circuit provides automatic reduction of gain, of the front end RF amplifier via feedback.
THEORY OF OPERATION UHF Receiver (Models with PCB 8486458Z03) The UHF receiver consists of a front end, back end, and automatic gain control circuits. A block diagram of the receiver is shown in Figure 2-3. Detailed descriptions of these features are contained in the paragraphs that follow.
UHF Receiver (Models with PCB 8486458Z03) The output of the bandpass filter is coupled to the RF amplifier transistor Q301 via C307. After being amplified by the RF amplifier, the RF signal is further filtered by a second varactor tuned bandpass filter, consisting of L306, L307, C313, C317, CR304 and CR305.
THEORY OF OPERATION Frequency Generation Circuit ( Refer to Figure 2-4 and the UHF Frequency Synthesizer schematic diagram ) The frequency generation circuit, shown in Figure 2-4, is composed of Fractional-N synthesizer U201 and VCO/Buffer IC U241. Designed in conjunction to maximize compatibility, the two ICs provide many of the functions that normally require additional circuitry.
Frequency Generation Circuit Synthesizer ( Refer to Figure 2-5 and the UHF Synthesizer schematic diagram) The Fractional-N synthesizer, shown in Figure 2-5, uses a 16.8MHz crystal (FL201) to provide a reference for the system. The LVFractN IC (U201) further divides this to 2.1MHz, 2.225MHz, and 2.4MHz to be used as reference frequencies.
2-10 THEORY OF OPERATION Voltage Controlled Oscillator (VCO) ( Refer to Figure 2-6 and the UHF Voltage Controlled Oscillator schematic diagram) The VCOB IC (U241), shown in Figure 2-6, in conjunction with the Fractional-N synthesizer (U201) generates RF in both the receive and the transmit modes of operation. The TRB line (U241 pin 19) determines which oscillator and buffer are enabled.
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Frequency Generation Circuit 2-11 Table 2-1 Level Shifter Logic Desired AUX 4 AUX 3 Mode High (@3.2V) High (@4.8V) High Battery Saver Hi-Z/Float (@2.5V) In the receive mode, U241 pin 19 is low or grounded. This activates the receive VCO by enabling the receive oscillator and the receive buffer of U241.
2-12 THEORY OF OPERATION Voice Storage (GP1280 Only) ( Refer to Figure 2-7 and the UHF Voice Storage schematic diagram) The Voice Storage feature is offered as standard in the GP1280 and as an Option board for GP340/GP360/GP380 and GP640/GP680 models. The Voice Storage feature enables users to: ■...
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Voice Storage (GP1280 Only) 2-13 Audio routing to the Voice Storage circuitry during receive message recording, message playback, personal memo recording and voice prompt transmit over the air are as follows: Received Message Recording The receive audio is tapped from the Rx_Aud_Rtn pin of the ASFIC_CMP during receive mode. Message Playback Message playback is via the FLAT_RX_SND pin of ASFIC_CMP.
Chapter 3 TROUBLESHOOTING CHARTS Troubleshooting Flow Chart for Receiver (All models except those with PCB 8486458Z03) (Sheet 1 of 2) START Bad SINAD Bad 20dB Quieting No Recovered Audio udio Check Controller at pin 27 of U301? Spray of inject 1st IF into XTAL Filter IF Freq: 45.1MHz Check Q320 bias...
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TROUBLESHOOTING CHARTS Troubleshooting Flow Chart for Receiver (All models except those with PCB 8486458Z03) (Sheet 2 of 2) Inject RF into J101 Q302 Trace IF signal collector OK? IF Signal from L311 to IF signal at L311? Q302. Check for present? bad XTAL filter.
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Troubleshooting Flow Chart for Receiver (Models with PCB 8486458Z03) (Sheet 1 of 2) Troubleshooting Flow Chart for Receiver (Models with PCB 8486458Z03) (Sheet 1 of 2) START Bad SINAD Bad 20dB Quieting No Recovered Audio Check Controller Audio at pin 8 of U301? Spray or inject 1st IF 44.85 MHz into...
TROUBLESHOOTING CHARTS Troubleshooting Flow Chart for Receiver (Models with PCB 8486458Z03) (Sheet 2 of 2) Inject RF into J101 Trace IF signal Q302 collec- from L311 to IF Signal at tor OK? Q302. Check for L311? IF signal bad XTAL filter. present? Before replacing U301, check...
Troubleshooting Flow Chart for Transmitter Troubleshooting Flow Chart for Transmitter START No Power Is There B+ Bias for Check Q111 Ant switch CR101 Is Control Voltage Is Current Check PCIC High or Low at C119 High 1. Check Pin Diodes Check Drive to 2.
TROUBLESHOOTING CHARTS Troubleshooting Flow Chart for Receive Message/Personal Memo Recording Cannot Receive Message Personal Memo Recording Check menu Turn on Check Mic I/P at whether record “Record Incoming J403-18 any audio? incoming messages Call” turned on Check Spkr/Mic Flex Connection J403 Check J400-34 Any audio?
Chapter. The Voice Storage facility may be fitted to other radios in the GP Series as an option board; reference must be made to the Option Board manual in this case. The Voice Storage schematic and the related PCBs are shown in Tables 4-2, 4-3 and 4-4 below.
UHF PCB/SCHEMATICS/PARTS LISTS Table 4-2 UHF GP1280 Diagrams and Parts Lists PCB : 8480587Z01 Main Board Top Side Page 4-17 Main Board Bottom Side Page 4-18 SCHEMATICS Controls and Switches Page 4-7 Receiver Front End Page 4-8 Receiver Back End Page 4-9 Synthesizer Page 4-10...
Allocation of Schematics and Circuit Boards Table 4-4 UHF GP1280 Diagrams and Parts Lists PCB : 8480587Z05 Main Board Top Side Page 4-33 Main Board Bottom Side Page 4-34 SCHEMATICS Controls and Switches Page 4-23 Receiver Front End Page 4-24 Receiver Back End Page 4-25 Synthesizer...
UHF PCB 8480450Z03 / PCB 8480587Z01 Parts List 4-13 UHF PCB 8480450Z03 / Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description PCB 8480587Z01 Parts List Part No. Part No. Part No. Circuit Motorola C138 2113743N50 100pF C235 2104993J02 2.2uF...
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UHF PCB 8480450Z03 / PCB 8480587Z01 Parts List 4-14 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C343 2113743A23 0.22uF C400 2113743L41 .01uF, 10% C448 2113928N01 0.1uF, 10%...
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UHF PCB 8480450Z03 / PCB 8480587Z01 Parts List 4-15 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. L116 2460591A50 9.75nH PB503 4080523Z01 Tactile, Pushbutton R170 0662057A34 R317 0662057M74...
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UHF PCB 8480450Z03 / PCB 8480587Z01 Parts List 4-16 * Motorola Depot Servicing only Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Reference designators with an asterisk indicate Part No. Part No. Part No. components which are not fieldreplaceable...
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Voice Storage Parts List (GP1280) 4-20 Voice Storage Parts List (GP1280) * Motorola Depot Servicing only Circuit Motorola Reference designators with an asterisk indicate Description Part No. components which are not fieldreplaceable because they need to be calibrated with C601...
UHF PCB 8480587Z03 Parts List 4-30 UHF PCB 8480587Z03 Parts List Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Part No. Part No. Part No. Circuit Motorola Description C174 2113743N50 100pF C278 2311049A09 2.2uF C343 2113743A23 0.220uF Part No.
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UHF PCB 8480587Z03 Parts List 4-31 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C424 2311049A59 10uF C511 2113743N50 100pF E400- L330 2462587N64 680nH C425 2113743M24 0.1uF C512...
UHF PCB 8480587Z05 Parts List 4-35 UHF PCB 8480587Z05 Parts List Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Ref. Part No. Ref. Part No. Ref. Part No. Circuit Motorola Description Ref. Part No. C141 NOTPLACED C238 2113741F17 470pF...
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UHF PCB 8480587Z05 Parts List 4-36 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Ref. Part No. Ref. Part No. Ref. Part No. Ref. Part No. C344 2113743M24 100000pF C4001 NOTPLACED C431 2113743N50 100pF C494 2113743N50...
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UHF PCB 8480587Z05 Parts List 4-37 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Ref. Part No. Ref. Part No. Ref. Part No. Ref. Part No. CR241 4805649Q13 Varactor J403 0905505Y02 20-Pin Connector L325 2480646Z20 2.20uH...
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UHF PCB 8480587Z05 Parts List 4-38 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Ref. Part No. Ref. Part No. Ref. Part No. Ref. Part No. R254 0662057M95 7.5K R338 NOTPLACED R431 0662057N39 470K R701 0662057N05...
UHF PCB 8480450Z13/14 Parts List 4-50 11.0 UHF PCB 8480450Z13/14 Circuit Motorola Part Circuit Motorola Part Circuit Motorola Part Description Description Description Parts List C171 2113743N50 100pF C272 NOT PLACED C339 - Circuit Motorola Part Description C172 2113740F51 100pF C273...
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UHF PCB 8480450Z13/14 Parts List 4-51 Circuit Motorola Part Circuit Motorola Part Circuit Motorola Part Circuit Motorola Part Description Description Description Description C416 2113928N01 0.1uF C503 2113743N50 100pF L108 2479990A01 4.22nH Q302 4802245J44 NPN Transistor C419 NOT PLACED C505 2113743N50...
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UHF B1 main PC board R317 0662057M74 1000 R428 0662057M10 SH302 2680555Z01 Receiver front end bot shield R318 0662057A79 * Motorola Depot Servicing only R319 0662057A29 R429 0662057M98 SH303 2680509Z01 Mixer shield Reference designators with an asterisk indicate R431 0662057N39...
UHF PCB 8486458Z03 Parts List 4-62 13.0 UHF PCB 8486458Z03 Parts List Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Part No. Part No. Part No. Circuit Motorola Description C170 2113743N50 100pF C263 2113743N02 0.75pF C337 NOT PLACED Part No.
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UHF PCB 8486458Z03 Parts List 4-63 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. C419 NOT PLACED C491 2113743N50 100pF E101 2484657R01 Ferrite Bead L271 2462587V32 68nH C420...
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UHF PCB 8486458Z03 Parts List 4-64 Circuit Motorola Circuit Motorola Circuit Motorola Circuit Motorola Description Description Description Description Part No. Part No. Part No. Part No. R103 0662057M41 R309 0662057M01 R405 0662057M01 R475 0662057M01 R104 0662057N15 R310 NOT PLACED R406...
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455kHz Ceramic Discriminator 1485777Z01 Insulator (KAPTON) 8486458Z03 UHF B1 PC Board * Motorola Depot Servicing only Reference designators with an asterisk indicate components which are not field replaceable because they need to be calibrated with specialized factory equipment after installation.
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Professional Radio GP Series 800 MHz (806 - 870MHz) Service Information Issue: November 2004...
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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...
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Table of Contents Chapter 1 MODEL CHART AND TECHNICAL SPECIFICATIONS 1.0 GP240/GP280/GP540/GP580 Model Chart............1-1 2.0 Technical Specifications ..................1-2 Chapter 2 THEORY OF OPERATION 1.0 Introduction ......................2-1 2.0 800 MHz Transmitter ...................2-1 2.1 Power Amplifier ....................2-1 2.2 Antenna Switch....................2-2 2.3 Harmonic Filter ....................2-2 2.4 Antenna Matching Network ................2-2 2.5 Power Control Integrated Circuit (PCIC) ............2-2 3.0 800 MHz Receiver ....................2-3...
MODEL CHART AND TECHNICAL SPECIFICATIONS Technical Specifications Data is specified for +25°C unless otherwise stated. General Specifications Channel Capacity GP240 GP280 128 in conv. Mode GP540 GP580 ±20% Power Supply Rechargeable battery 7.5Volts Dimensions: H x W x D (mm) Height excluding knobs GP240/280/540/580 With standard high capacity NiMH battery 137 x 57.5 x 37.5...
Chapter 2 THEORY OF OPERATION Introduction This Chapter provides a detailed theory of operation for the UHF circuits in the radio. For details of the theory of operation and trouble shooting for the the associated Controller circuits refer to the Controller Section of this manual.
THEORY OF OPERATION This RF driver IC is capable of supplying an output power of 0.3W (pin 13 and 14) with an input signal of 2.5mW (4dBm) (pin16). The current drain would typically be 200mA while operating in the frequency range of 806-870MHz. The 85Y73 LDMOS PA is capable of supplying an output power of 4.5W with an input signal of 0.3W.
800 MHz Receiver 800 MHz Receiver The receiver functions are shown in Figure 2-20 and are described in the paragraphs that follow. Antenna Pin Diode 3-Pole 3-Pole Antenna Ceramic Ceramic Crystal RFJack Switch Block Filter Block Filter Mixer Filter Processing First LO from FGU Recovered Audio...
THEORY OF OPERATION The IF signal coming out of the mixer is transferred to the crystal filter (FL350) through a resistive pad and a diplexer (C312 and L306). Matching to the input of the crystal filter is provided by L353,L354, C377, and C378. The crystal filter provides the necessary selectivity and intermodulation protection.
800 MHz Receiver Automatic Gain Control (AGC) ( Refer to the 800 MHz Receiver Front End and Receiver Back End schematic diagrams ) The automatic gain control circuit provides automatic gain reduction of both the low noise amplifier in the receiver front end and the IF amplifier in the receiver backend. This action is necessary to prevent overloading of the backend IF IC.
THEORY OF OPERATION Frequency Generation Circuit ( Refer to Figure 2-3 and the 800 MHz Frequency Synthesizer schematic diagram ) The frequency generation circuit is shown in Figure 2-21. The circuit is composed of the two main ICs: ■ Fractional-N synthesizer, U201 ■...
Frequency Generation Circuit Synthesizer ( Refer to Figure 2-4 and the 800 MHz Synthesizer schematic diagram) The Fractional-N Synthesizer uses a 16.8MHz crystal (FL201) to provide a reference for the system. The LVFractN IC (U201) further divides this to 2.1MHz, 2.225MHz, and 2.4MHz as reference frequencies.
THEORY OF OPERATION Voltage Controlled Oscillator (VCO) ( Refer to Figure 2-5 and the 800 MHz Voltage Controlled Oscillator schematic diagram) The VCOBIC (U250) in conjunction with the Fractional-N synthesizer (U201) generates RF in both the receive and the transmit modes of operation. The TRB line (U250 pin 19) determines which oscillator and buffer will be enabled.
Privacy Plus Trunked Systems 4.3.1 Privacy Plus is a proprietary trunking protocol developed by Motorola which allows a large number of users to share small amounts of frequencies without interfering with each other. The Privacy Plus configuration consists of shared multiple channel repeaters. The Privacy Plus Trunked system includes a Central Controller, which directs the users to the open channels.
2-10 THEORY OF OPERATION 4.3.3 MPT Trunked Systems MPT (Ministry of Post and Telecommunications) developed a signalling standard (MPT1327) for trunked private land mobile radio systems. This standard defines the protocol rules for communication between a trunking system controller (TSC) and user’s radio units. The protocol offers a broad range of options which can be implemented in subsets according to user requirements.
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Frequency Generation Circuit 2-11 Low Speed Data Filter This analog circuitry is a 4 pole, 150 Hz cutoff low pass filter comprised of U603-1, U603-2 and associated passive components. In receive mode, it removes noise and voice band signals leaving only the low speed data waveform which is applied to the ADC input of the MCU.
Chapter 3 TROUBLESHOOTING CHARTS Troubleshooting Flow Chart for Receiver (Sheet 1 of 2) START Bad SINAD Bad 20dB Quieting No Recovered Audio udio Check Controller at pin 27 of U351? Spray of inject 1st IF into XTAL Filter IF Freq: 109.65MHz Check Q350 bias circuitry for faults.
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TROUBLESHOOTING CHARTS Troubleshooting Flow Chart for Receiver (Sheet 2 of 2) Inject RF into J101 Trace IF signal the level of Signal from L353 to the IF signal of the at L353 U352. Check for output of U352 as bad XTAL filter. indicated Before replacing U351, check...
Troubleshooting Flow Chart for Transmitter Troubleshooting Flow Chart for Transmitter START Low Power No Power No Power out or Low Power overall radio current between 0.8 and 1.3 A when transmitting there a Replace F501 the fuse F501 Check L101, L102, short circuit C101, CR101 for after C113...
TROUBLESHOOTING CHARTS Troubleshooting Flow Chart for Synthesizer Start 3.3V at U201 pins Check 5, 20, 34& U248 & L202 Visual Correct check of the Check Problem Board OK D201,D202, C244, C245, C246 & C228 U201 16.8MHz 16.8MHz at pin 6 of Pin47 AT = Replace Signal at...
Troubleshooting Flow Chart for VCO Troubleshooting Flow Chart for VCO START Is Tx signal Is LO signal VCO is OK. present at the PA present at the driver IC, U101? mixer IC U301? Resolder or Is resonator IC replace U205 soldered U205.
TROUBLESHOOTING CHARTS Troubleshooting Flow Chart for PassPort Trunking Start Check Radio Operation on a Non PassPort Zone with a Conventional Personality without the Option Board Enabled Check Radio PassPort Programming using CPS Check Switched Battery and Vdd from Radio on PTCB Check Radio PassPort Programming using CPS Demod...
Chapter 4 800MHZ /PCB/SCHEMATICS/PARTS LIST Allocation of Schematics and Circuit Boards Controller Circuits The 800MHz circuits are contained on the printed circuit board (PCB) which also contains the Controller circuits. This chapter shows the schematics for the 800MHz circuits only, refer to the Controller section for details of the related Controller circuits.The PCB component layouts and the Parts Lists in this Chapter show both the Controller and UHF circuit components.