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6802945C75-A - The Repeater Builder`s Technical Information Page

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1. 2 6 External PTI Sense Circuits P 2 6 2 6 TX Data 2 6 Sub Audible Data 2 7 High Speed 2 7 j DL M M 2 7 a 2 7 RX Audio Processing and Digital Volume Control seen nennen enne 2 7 Audio Power Amplifietz 5 no iria 2 8 Audio PA Muting and Output 2 8 Receive Data Circuits cuina p 2 8 Alert Tone Circuits 2 8 Section 3 Accessory OV OL VIEW 0 OO PO O E OO OO a a 3 1 DO sit 3 1 o 3 1 Handling Precauciones 3 1 Maintenance 3 2 Section 4 Troubleshooting a Ls E naie 4 1 Troubleshooting Charts eiecit degener ea 4 1 Troubleshooting Flow Chart for Receiver miraba 4 2 Troubleshooting Flow Chart for 4 3 Troubleshooting Flow Chart for Synthesizer eese nennen ener 4 4 Troubleshooting Flow Chart for Controller eese eere enne nne 4 5 Section 5
2. HEAT FOCUS INSIDE DIMENSIONS USED ON MAXIMUM PRESCRIBED HEADS OF HEADS HEAT SETTING 6680334B52 0 572 x 0 572 U701 Refer to Maintenance Section of Manual for prescribed heat setting 6680371B15 0 460 x 0 560 VCO shield SH260 Test Set Service Cable 6 3 5 mm plug 12 NOTE Pins 2 and 7 5 14 Speaker Hi Een p 47 Ohm 1 2W 9 Speaker Lo sleeve 11 2 3 Gnd 51 1 0 uF as ee 4 Mic Audio OS WA 5 2 5 mm plug 33K 1 8 W 4 7 P1 DETAIL 8 June 1999 FRONT SIDE NOTE For proper speaker impedance the RTX4005B test set Audio out switch must be set to the MX position Figure 1 68P02945C75 A Service Cable RKN4034A for the Test Set RTX4005B xiii Foreword GTX GTX LTR LTS 2000 Portable Radios Service Manual Radio Model Numbering System Radio Model Numbering System The model number serial number and Motorola FCC designation number are all on a label attached to the back of your radio All GTX GTX LTR LTS 2000 radio models are synthesized 8 channel units that come standard with Tone Private Line Digital Private Line DPL coded squelch or carrier squelch which may be enabled disabled on a per channel basis Program ming changes can be made by your local dealer GTX Model Number H 1 1
3. ANTENNA ADAPTER RIB RLN4008B 68P02945C75 A Radio Alignment Test Setup Radio Tuning Procedure Tuning Procedure keyboard UP DOWN arrow keys respectively A graphical scale is displayed indicating the minimum maximum and proposed value of the softpot as shown in Figure 3 Tuning Procedure NOTE Perform the following procedures in the sequence indicated Reference Oscillator Alignment Adjustment of the reference oscillator is critical for proper radio operation Improper adjustment will not only result in poor operation but also a misaligned radio that will interfere with other users operating on adjacent channels For this reason the reference oscillator should be checked every time the radio is serviced The frequency counter used for this procedure must have a stability of 0 1 ppm or better 1 From the SERVICE menu press F2 to select ALIGNMENT TRANSMITTER amp RECEIVER GTX GTX LTR LTS 2000 Portable Radios Service Manual 2 Press F5 to select the REFERENCE OSCILLA TOR softpot 3 Press F6 to key the radio The screen will indi cate that the radio is transmitting 4 Measure the transmit frequency on your fre quency counter 5 Use the UP DOWN arrow keys to adjust the reference oscillator 6 Press F6 again to dekey the radio and then press F8 to program the softpot value 7 Press F10 F10 to return to SERVICE menu Squelch The squelch so
4. Parts Lists for NAF5037A 000202001 enne ener conan nnne Motorola Private Line and Digital Private Line trademarks of Motorola Inc 8 18 8 18 is a registered trademark and PC DOS PC Convertible and PS 2 Model 30 50 70 are trademarks of International Business Machine Corporation MS DOS is a trademark of Microsoft Corp iv 68P02945C75 A June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual Foreword GTX GTX LTR Portable Radio Model Chart GTX GTX LTR Portable Radio Model Chart GTX 800MHz Portable Radio Model Chart Model Description H11UCC6DB1_N GTX Basic Radio 800 2 Privacy Plus H11UCC6DU1 N GTX Basic Radio 800MHz LTR H11UCD6CB1 GTX Keypad Radio 800 2 Privacy Plus H11UCD6CU1_N GTX Keypad Radio 800MHz LTR x Indicates one of each is required Item Description X HLN3140 Front Housing Assembly with Logic Board X HLN3141 Front Housing Assembly with Logic Board X FLN2392 Front Housing Assembly with Logic Board X FLN2445 Front Housing Assembly with Logic Board X HLN9859 Logic Board amp Unit X HLN9860 Logic Board amp Unit X FEN1648 Logic Board amp Unit X FEN1656 Logic Board amp Unit X X X FUF1191 2 5 ppm RF Unit X X X X FLN2394 Chassis Assembly Not all kit
5. radios only June 1999 68P02945C75 A 5 1 Radio Diagnostic Utilities Test Mode Tx Modulation GTX GTX LTR LTS 2000 Portable Radios Service Manual Test Mode Tx Modulation Use PTT switch for modulation type selection A con tinuous press will advance the radio to the next modu lation test cyclic scroll and perform Tx test till PTT is released The modulation selection is described in the table below Table5 2 Test Mode Tx Modulation Modulation Type Internal Speaker Audio Signaling Internal Microphone Status Display CSQ None On 0 C 1 Low Speed None On 1C 1 High Speed Call Back Off 2 C 1 DTMF 4 DTMF Off 3 C 1 C stands for the selected channel 1 7 see Table 5 1 Fail Mode The radio will enter Fail Mode upon detecting one of the following errors Application start up self check error Exiting Test Mode To exit Test Mode proceed as follows Turn radio off Turn RIB on Turn radio on Codeplug information check error There are two categories of errors critical and non crit ical Critical errors will stop radio normal operation Non critical errors will be temporarily indicated as described in the table below Table 5 3 Fail Mode Error number Failure Description Display Critical Tone Sound 1 Internal RAM Fatal 01 Yes Illegal tone 2 External RAM Fatal 02 Yes Illegal tone Reserve
6. 1 2 Front Housing Board Removal i enini imet 1 3 Radio Reassembly e M M 1 3 Front Housing Reassembly 1 3 Front Housing Reassembly Basic Model seen enne nnne 1 4 Chassis Reassembly d t Pa bea t error e Feria Dan HA eat dcs 1 4 Radio REassembly P 1 5 Section 2 Theory of Operation O PO II A an iasanen niis 2 1 RECEIVE Tiisin 2 1 Intermediate Frequency ertt tete tinta tiat tee tad ses eer ea n pa e Pee d pea ERR LE ERRARE ARR 2 1 IA 2 1 Prequency Gonna 2 4 Motorola Inc 1998 All Rights Reserved 68P02945C75 A 1 Table of Contents GTX GTX LTR LTS 2000 Portable Radios Service Manual Controle 2 5 2 5 Normal Operation viviste 25 Clock Synthesizer ensuite itae pm nidi 2 5 BUSO pera 2 5 2 5 I genu 2 5 Ce 2 6 LED Contr as 2 6 Audio amp Bata CITCUIU
7. failure During all repair procedures heating neighboring components can be minimized by Using upper heat only using the correct size heat focus head approximately the same size as the carrier being replaced Keeping the heat focus head approximately 1 8 0 3cm above the printed circuit board when removing or replacing the device Shields 1 June 1999 To remove the select the R 1319A Air Flow Station and the appropriate heat focus head approximately the same size as the OMPAC Attach the heat focus head to the 68P02945C75 A Maintenance Repair Procedures and Techniques chimney heater Adjust the temperature con trol to approximately 415 F 215 C 445 F 230 C maximum Adjust the airflow slightly above the minimum setting Apply the solder paste flux around the edge of the OMPAC Place the circuit board in the R 1319A s circuit board holder and position the OMPAC under the heat focus head Lower the vacuum tip and attach it to the OMPAC by turning on the vacuum pump Lower the heat focus head until it is approximately 1 8 0 3cm above the carrier Turn on the heater and wait until the OMPAC lifts off the circuit board Once the part is off grab it with a pair of tweezers and turn off the vacuum pump Remove the circuit board from the R 1319A s circuit board holder To replace the OMPAC the solder pads on the board must first be cleaned of all solder to ensure alignme
8. Frequency Band Position 10 Feature Level 806 870 MHz Standard Package Position 5 Power Level Position 9 Primary System Type SW Position 6 Physical Package Clear SMARTNET Full Keypad with Display Position 8 Primary Operation Position 7 Channel Spacing runked 7 68 02945 75 June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual Foreword Radio Service Software Information Radio Service Software Information To run the Radio Service Software you will need the following equipment IBM XT AT Convertible or System 2 Model 30 50 with 512K RAM Dual Floppy Disk Drives or one Floppy Disk and one Hard Disk PC DOS or MS DOS 3 0 or later Radio Interface Box RIB RLN4008 RIB to IBM AT cable 30 80369B72 AT cable to IBM XT computer adapter optional RLN4438 Programming Test cable RIB power supply 0180357457 120 Vac or 0180358A56 220 Vac SOY Qi Wm SN 0180357A57 1 20 Vac or 30 80369B72 or 0180358A56 220 Vac 30 80369B71 _ RIB Power Supply RIB to Computer Cable Plugs into 120 or 220 Vac outlet Plugs into RIB and computer 7 4 U RVN4150D for GTX GTX LTR or RVN4156F for LTS 2000 Software RLN4008 RIB GTX GTX LTR LTS 2000 Radio HKN9857 Programming Test cable Connects between the RIB and rad
9. The GTX GTX LTR LTS 2000 front end modules con sist of three blocks of circuitry a ceramic pre selector filter RF amplifier and ceramic post selector filter The ceramic pre and post selector filters are 3 pole bandpass filters This topology maximizes the attenua tion at the worst case image frequency for this receiver which is 90 2 MHz below the filter passband The 3 dB bandwidth is approximately 22 MHz centered at 861 MHz The center of the band insertion loss is approximately 2 dB The 3 pole filters are designed to operate with a 50 Ohm input and output termination The RF amplifier O1 is a Motorola MRF9411 NPN device biased in a common emitter configuration The amp is stabilized by the shunt feedback coil L2 and has approximately 15 dB of gain with a noise figure of about 2 dB The amplifier draws 6 5 mA of current and is supplied by the receiver 5 V supply indicated as on the schematics and block diagrams Terminating the RF amplifier is the post selector filter This filter is the same as the pre filter The net gain of the receiver front end module is about 12 dB in the center of the band and about 11 5 dB at the band edges The net center of the band noise figure is approximately 4 5 dB The receiver mixer is a double balanced mixer which provides excellent protection against receiver spurs due to non linearities such as IM and half IF The received signal mixes down to the frequency of the first IF
10. 45 1 MHz and enters the IF circuitry The mixer operates with a LO level of 3 dBm and conversion loss is about 7 dB June 1999 Intermediate Frequency IF The Intermediate Frequency IF section of the portable radio consists of several sections including the high IF the second LO the second IF and the IF IC chip The first LO signal and the RF signal mix to the IF fre quency of 45 1 MHz and then enters the IF portion of the radio The signal first enters the high IF passes through a crystal filter is then amplified by the IF amp and then passed through a second crystal filter The first crystal filter provides selectivity second image protection and intermodulation protection The amplifier provides approximately 16 dB of gain to the signal The signal then passes through the second crystal filter which pro vides further selectivity and second image protection The high IF has an approximate 3 dB bandwidth of 7 KHz The filtered and amplified IF signal then mixes with the second local oscillator at 44 645 MHz The second LO uses an amplifier internal to the IF IC an external crys tal and some external chip parts The oscillator pre sents an approximate level of 15 dBm to the second IF mixer internal to the IF IC The output of the mixing of the IF signal and the sec ond LO produces a signal at 455 KHz second IF This signal is then filtered by external ceramic filters and amplified It is then passed back to th
11. 50V 2113741A53 chip 022 35 50V C4 2113741B69 chip 1 45 50V coil inductor L1 thru L4 2462575A02 chip 680 nH 10 header 090989702 4 pin switch 51 3905834K06 dome PTT miscellaneous MK1 0180706Y83 microphone assembly LS1 5005910P05 speaker L2 L1 S1 PTT PYYYA 2 5 mm plug Tip 2 C1 C2 Lf YYYN 25mm plug Sleeve L3 14 3 5 mm plug Tip 3 5 mm plug leeve 151 5 Figure 3 2 Schematic Diagram 3 2 68P02945C75 A June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual Accessory Maintenance Mechanical Parts List HMN9030 Remote Speaker Microphone REFERENCE MOTOROLA PART NO SYMBOL gt Oo NRO 1580617U01 3580619U01 0180709Y90 7580418D04 3280621U01 1580618001 5480622001 0310945 12 0484345 06 3880620001 3805248001 3080417 21 4205823 01 DESCRIPTION HOUSING front BAFFLE felt ASSY microphone speaker amp PCB BUSHING retainer GASKET HOUSING rear LABEL SCREW thread forming WASHER PTT pushbutton ACTUATOR PTT CORD CLIP slide on June 1999 Figure 3 3 Exploded View 68P02945C75 A 3 3 Accessory GTX GTX LTR LTS 2000 Portable Radios Service Manual This page intentionally left blank 3 4 68P02945C75 A June 1999 Section 4 Troubleshooting Overview This section contains three troubleshooting tables for the following GT
12. 580 eee Hielo viii Performance SPecifiCatiOns MENT NN erati ane iia E EA AE EE A AEE Ran xi Test EJU PME N xi DETVICE 0 0 xii Test Set Service Cable miii xiii Radio Model Numbering System eontra aiii xiv Radio Service Software 400021100 xv Configuring the RIB and Radio rient ese tid Ed ee rH A HL F e HEU Hu EFE AERE RETE A Rt xv 1 Important Safety Information Intrinsically Safe Radios sse xvii FMRC Approved Equipfnent trier i irte xvii Repair of FMRC Approved Products eee nite iiie ER ERE ARCA ERU SE cades xviii Dr p xviii IKE JInre xix Do Not Substitute Options or Accessories xix Vehicles Equipped with Air ttattettnttn ttt tta tte tte sinini siainen xix Section 1 Radio Disassembly Assembly T 1 1 Safety IOMA 1 1 ISTE OBI TS niodo M 1 1 Battery Removal ui sisi 1 1 Chassis Rem yal 1 1 Main Board
13. These batteries are only compatible with portables ordered from the factory with the Factory Mutual option viii 68P02945C75 A June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual Foreword GTX GTX LTR LTS 2000 Accessories E x 2 GTX GTX LTR LTS 2000 Accessories cont 58 Documentation Kits 68P02946C80 GTX Portable Radio User s Guide X 68P02948C65 GTX LTR Portable Radio User s Guide X 68P02945C75 GTX GTX LTR LTS 2000 Portable Radios Service Manual X 68P02945C85 LTS 2000 Portable Radio User s Guide Radio Service Software RSS X RVN4150 GTX GTX LTR X RVN4156 LTS 2000 X 68P02946C20 LCS LTS 2000 RSS User s Guide X 68P02948C70 GTX GTX LTR RSS User s Guide X 9857 Programming Test Cable See RSS information for hardware details June 1999 Prices and availability subject to change without notice 68P02945C75 A ix Performance Specifications Performance Specifications GTX GTX LTR LTS 2000 Portable Radios Service Manual GENERAL RECEIVER TRANSMITTER FCC Designation Frequency Range 851 870 MHz RF Power 3W GTX GTX LTR AZA89FT5776 LTS 2000 AZA89FT5777 Power Supply NiCad Battery Bandwidth 19 MHz Frequency range 806 825 MHz 851 870 MHz Battery Voltage Usable Sensitivity 0 35 max Freq Stability Nominal 75V 12 dB SINAD 30 60 25 ref 0 000
14. U701 to set up the proper low speed data deviation and select the PL or DPL filters The microprocessor then generates a square wave from U705 P6 which strobes the ASFIC PL CLK U701 C3 For encode input at twelve times the desired data rate For exam ple for a PL frequency of 103 Hz the frequency of the square wave at U701 P20 would be a1236 Hz This derives a tone generator inside U701 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 U701 H8 VCO ATN where it is sent to the transceiver board as previously described for transmit audio High Speed Data High speed data refers to the 3600 baud data wave forms ISWS AND OSWS used in a trunking system for high speed communication between the radio and the central controller To generate an ISW the micro processor U709 first programs the ASFIC U701 to the proper filter and gain settings It then begins strob ing U701 G1 Trunking Clock In with a square wave from 709 5 at the same baud rate as the data The output waveform from 5 3 2 State Encoder of U701 is then fed to the post limiter summer block and then the splatter filter From that point it is routed through the mode attenuator and then out of the ASFIC to the transceiver board via VCO 701 8 DTMF Data data is a dual tone waveform use
15. between U220 1 amp 0270 pin 6 5 6 amp of 0220 toggle when channel is changed Is U270 pin 1 0 7 V DC in RX and gt 4 7 DC in TX NO 5 there a short between pin 32 and pins 9 amp 10 of Check U400 Check programming lines between U709 and U220 pins 5 6 amp 7 YES Replace U220 Remove shorts NO s information from U709 s U220 pin 18 at 4 65 VDC Check uP 0709 troubleshooting chart YES Y Replace U220 If pin 1815 properly s RF level at soldered to the pin 20 PCB replace U220 between 10 amp 5 dBm If C271 and runners between U220 pin 20 amp U220 pin 15 are OK then see VCO troubleshooting chart Replace or Are C241 C243 yis resolder 245 247 C249 Replace U220 necessary C253 L246 components R242 R244 and R245 OK TX not at talk around frequency Troubleshooting Flow Chart for Synthesizer 4 4 68P02945C75 A June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Troubleshooting Troubleshooting Charts ly power to radio turn on No Don t now Wa enabled with RSS Yes Y Use RSS to enable tones Are alert tones enabled with RSS Check radio con nection to
16. fuel or chemical transfer or storage facilities areas where the air contains chemical or particles such as grain dust or metal powders and any other area where you would normally be advised to turn off your vehicle engine Areas with potentially explosive atmospheres are often but not always posted OPERATIONAL CAUTIONS DAMAGED ANTENNAS Do not use any portable two way radio that has a damaged antenna If a damaged antenna comes into contact with your skin a minor burn can result batteries can cause property damage and or bodily injury such as burns if a conductive material such as jewelry keys beaded chains touch exposed terminals The conductive material may complete an electrical circuit short circuit and become quite hot Exercise care in handling any charged battery particularly when placing it inside a pocket purse or other container with metal objects REPLACEMENT PARTS ORDERING ORDERING INFORMATION You can order additional components and some piece parts directly through your GTX GTX LTR LTS 2000 price pages When ordering replacement parts include the complete identification number for all chassis kits and components If you do not know a part number include with your order the number of the chassis or kit which contains the part and a detailed description of the desired component If a Motorola part number is identified on a parts list you should be able to order the part through Moto
17. to select the transmit deviation bal ance and deviation limit softpot The screen will indicate the transmit test frequencies to be used 3 Begin with the lowest test frequency shown on the screen 4 Press F4 to select 60 Hz 5 Press F6 to key the radio Record this meas urement 6 Press again to dekey the radio and press F4 to select 2 5 kHz 7 Press F6 to key the radio then use the UP DOWN arrow keys to adjust the deviation until the value in step 5 and the value in step 6 are equal 8 Press F6 to dekey the radio Press ENTER to move to next softpot value 9 Press F8 to program the softpot value Transmit Deviation Limit The transmit deviation limit softpot sets the maximum deviation of the carrier Tuning is performed for 25 kHz channel spacing 1 Press F10 to select the DEVIATION LIMIT ADJUSTMENT softpot The screen will indi cate the transmit test frequencies to be used 2 Begin with the lowest test frequency shown on the screen 3 With Test Box RTX4005A inject a 1 KHz tone 2000 mVrms 4 Press F6 to key the radio and use the UP DOWN arrow keys to adjust the deviation to between 4 4 KHz and 4 8 kHz 5 Press F6 to dekey the radio Press ENTER to move to the next softpot value 6 Press F8 to program the softpot value 7 Press F10 F10 to return to the SERVICE menu 68P02945C75 A 7 3 Radio Tuning Procedure GTX GTX LTR LTS 2000 Portable Radios Service Manual This page
18. 4 MOTOROLA GTX GTX LTR LTS 2000 Portable Radios Service Manual 68P02945C75 A Motorola Inc 8000 West Sunrise Boulevard Fort Lauderdale Florida 33322 9934 SAFE AND EFFICIENT OPERATION OF TWO WAY RADIOS SCOPE 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 the general safety information contained in user guides published prior to 1st January 1998 For information regarding radio use in a hazardous atmosphere please refer to the Factory Mutual FM Approval Manual Supplement or Instruction Card which is included with radio models that offer this capability EXPOSURE TO RADIO FREQUENCY ENERGY National and International Standards and Guidelines Your Motorola two way Radio which generates and radiates radio frequency RF electromagnetic energy EME is designed to comply with the following national and international standards and guidelines regarding exposure of human beings to radio frequency electromagnetic energy Federal Communications CommissionReport and Order No FCC 96 326 August 1996 American National Standards Institute C95 1 1992 National Council on Radiation Protection and Measurements NCRP 1986 e International Commission on Non Ionizing Radiation Protection 1986 European Committee for Electrotechnical Standardization CENELEC Env 50166 1 1995
19. LOGIC or RF BOARD Press to select SQUELCH RSSI Press F10 to select RSSI Set Signal Generator to 870 1625 MHz Set RF level to 106dBm Qv geo A Press F4 to read the RSSI digital value dis played on the top right side of the screen 7 Type this value in the appropriate place on the Screen 8 Repeat steps 6 to 7 with RF levels of 90dBm and 74dBm 9 Press F8 to program the values Transmitter Power 1 From the SERVICE menu press F2 to select ALIGNMENT TRANSMITTER amp RECEIVER 2 Press F7 to select the Tx POWER calibration softpot The screen will indicate the transmit test frequencies to be used 3 Press F6 to key the radio and use the UP DOWN arrow keys to adjust the transmit power value Press F6 to dekey the radio Press ENTER to select next softpot frequency 4 Press F8 to program the value 5 Press F10 F10 to return to the SERVICE menu Transmit Deviation Balance Compensation amp Deviation Limit Compensation alignment balances the modulation June 1999 Radio Tuning Procedure Tuning Procedure sensitivity of the VCO and reference modulation synthesizer low frequency port lines Compensation algorithm is critical to the operation of signaling schemes that have very low frequency components e g DPL and could result in distorted waveforms if improperly adjusted 1 From the SERVICE menu press F2 to select ALIGNMENT TRANSMITTER amp RECEIVER 2 Press
20. Logic Bordo 8 14 Parts Lists for FLN9064A Logic Borda 8 14 GTX GTX LTR Mechanical Parts LiSt ooooonncocnnocnnoooncnonnncnonnnnononcnononcnonnnnonnnonon aa 8 14 GIX E 8 14 GTX GTX LTR Basic Model Mechanical Parts 1 15 nennen 8 14 GTX Basic Model Radio Exploded Vi ri 8 14 ETS2000 Me chanical Parts ad aT RE 8 15 LTS 2000 Exploded MEN b eb EN 8 16 Miscellaneous Parts Lists ted rel ed led fed ld sd 8 17 Parts Lists for FHN5873A Housing GTX GTX LTR sese nennen enne 8 17 Parts Lists for FHN5874A Housing LTS 2000 00000 000 8 17 Parts Lists for FHN5978A Housing LTS 2000 SmartZone essen 8 17 June 1999 68P02945C75 A iii Table of Contents GTX GTX LTR LTS 2000 Portable Radios Service Manual Miscellaneous Parts Lists nennen enne eene enne senes nena Parts Lists for FLN8574A Housing Miscellaneous Parts GTX GTX LTR Parts Lists for FLN8576A Housing Miscellaneous Parts LTS 2000 Parts Lists for FLN8575A Shield amp Parts Lists for FLN8577A Miscellaneous Parts GTX GTX Parts Lists for FLN8665A Miscellaneous Parts LTS 2000 Parts Lists for FLN8665B Miscellaneous Parts LTS 2000 SmartZone Parts Lists for FSN5509A Speaker amp Microphone Assembly
21. P7 monostable multivibrator output is logic LO pulling 411 emitter to Vee with the audio PA controlled by U701 A3 Should U409 P5 and or U409 P8 become shorted to each other or to the ground Vee current consumption exceeds 500 mA approximately and Q412 collector When U405 2 P5 voltage rises higher than the U405 2 P6 reference volt age rise time is less than 50 usec U405 2 is triggered and U405 2 P7 dc output voltage is switched to 4Vdc effectively biasing O411 into cut off and turning off the audio PA power switch Q410 U405 2 P7 remains in this state for 15 msec then reset to logic LO state Average power dissipation in the audio PA circuit com ponents is helped to a low level by the low duty cycle less than 0 3 of the audio PA protection circuit The cycle repeats until the audio PA output short is removed Receive Data Circuits The ASFIC U701 decodes all receive data which includes PL DPL low speed trunking MDC and high speed trunking data The decode process for each data type typically involves low pass or band pass filtering signal amplification and then routing the sig 2 8 68P02945C75 A GTX GTX LTR LTS 2000 Portable Radios Service Manual nal to a comparator which outputs a logic zero or one signal The detected audio from the transceiver board is routed to U701 H6 and J7 through coupling cap C435 Inside U701 the data is filtered according to the data type HS data or LS data then hard limited
22. avoid damage to circuits observe the following handling shipping and servicing precautions June 1999 68P02945C75 A Figure 3 1 Ideal Microphone Position Prior to and while servicing a remote speaker microphone particularly after moving within the service area momentarily place both hands on a bare metal earth grounded surface This will discharge any static charge which may have accumulated on the person doing the ser vice Whenever possible avoid touching any electri cally conductive part of the unit with your hands NOTE Wearing a conductive wrist strap Motor ola No RSX 4015A will minimize static buildup during servicing WARNING While wearing a conductive wrist strap be careful near high voltage sources The good ground provided by the wrist strap will also increase the danger of lethal shock from accidentally touching high voltage sources When servicing a unit avoid carpeted areas dry environments and certain types of clothing 3 1 Accessory Maintenance silk nylon etc because they contribute to static buildup Allelectrically powered test equipment should be grounded Apply the ground lead from the test equipment to the unit before connecting the test probe Similarly disconnect the test probe prior to removing the ground lead If the microphone cartridge is removed from the unit place it on a conductive surface such as a sheet of aluminum foil which is connected to ground th
23. avoided Cleaning External Plastic Surfaces The detergent water solution should be applied sparingly with a stiff non metallic short bristled 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 Cleaning Internal Circuit Boards and Components 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 Alcohol is a high wetting liquid and can carry contamination into unwanted places if an excessive quantity is used Make sure that controls or tunable components are not soaked with the liquid Do not use high pressure air to hasten the drying process since this could cause the liquid to puddle and 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 NOTE Always use a fresh supply of alcohol and a clean container to prevent contamina tion by dissolved material from previ ous usage Safe Handling of CMOS Devices Complementary metal oxide semiconductor CMOS devices are used in this family of radios
24. input from the 16 8 MHz tempera ture compensated reference oscillator If the two fre quencies differ the synthesizer generates a control error voltage causing the VCO to change frequency Modulation of the carrier is achieved by using a 2 port modulation technique The deviation of the low fre quency tone such as PL DPL is achieved by injecting the signal into an analog digital circuit in the synthe sizer The resulting digitized signal is then modulated by the fractional N divider this generates the required deviation The deviation of the high frequency tone is achieved by modulating the modulation varactor on the VCO In order to cover a very wide bandwidth the VCO control voltage is stepped up by using a positive multiplier circuit A 13 V supply powers the phase detector circuitry The VCO signal is amplified by the integrated buffer amplifier of the VCO buffer The buffer IC Tx output signal is filtered and channeled to the RF PA U101 The buffer IC Rx output signal is connected to the Rx injection buffer The output signal of that buffer is supplied to the receiver first mixer U50 as the injection signal Controller The GTX GTX LTR LTS 2000 controller is an open architecture which consists of e 0709 Motorola 68HC11K1 microprocessor U701 AudioSignalling Filter Integrated Circuit ASFIC e U703 EEPROM 4 Kbyte for GIX 4 Kbyte or 8 Kbyte for LTS 2000 U705 128 256 Kbyte OTP FLASH ROM U706 8 32 Kbyte
25. intentionally left blank 7 4 68P02945C75 A June 1999
26. one 3 Reassemble the Front Housing as given in Section 1 Radio Disassembly Assembly Front Housing Reassembly 4 Reassemble the radio as given in Section 1 Radio Disassembly Assembly Radio Reas sembly 5 Turn the radio ON NOTE The radio will display ERROR 06 with an illegal continuous tone 6 Carry out the Blank Board Initialization Procedure as given in the LCS LTS 2000 Radios RSS User s Guide page 24 or in the GTX LTR Radios RSS User s Guide page 24 7 Make the calibrations according to the Logic or RF Board Replacement Procedure as given in the RSS User s Guide mentioned in item 6 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 700 370 C and adjust the airflow to a minimum setting Airflow can vary due to component density 1 To remove a chip component select a hot air hand piece and position the nozzle of the hand piece approximately 1 8 above the component to be removed Begin applying the hot air Once the solder reflows remove the component using a pair of tweezers Using solder wick and a soldering iron or a June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual power desoldering station remove the excess solder from the pads To replac
27. the heater chimney Add solder paste flux around the base of the shield Position the shield under the heat focus head Lower the 6 3 Maintenance Repair Procedures and Techniques vacuum tip and attach it to the shield by turn ing on the vacuum pump Lower the focus head until it is approximately 1 8 0 3cm above the shield Turn on the heater and wait until the shield lifts off the circuit board Once the shield is off turn off the heat grab the part with a pair of tweezers and turn off the vac uum pump Remove the circuit board from the R 1319A s circuit board holder To replace the shield add solder to the shield if necessary using a micro tipped soldering iron 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 68P02945C75 A GTX GTX LTR LTS 2000 Portable Radios Service Manual remove excess solder from the solder pads on the circuit board Place the circuit board back in the R 1319A s circuit board holder Place the shield on the circuit board using a pair of tweezers Position the heat focus head over the shield and lower it to approximately 1 8 above the shield Turn on the heater and wait for the solder to reflow Once complete turn off the heat raise the heatfocus head and wait approximately one minute for the part to cool Remove the circuit board and inspect the repair No cleaning should be necessary June 1999 Sec
28. the transmitter and receiver into an antenna a network is used to match the antenna s impedance to the harmonic filter The network is made up of C125 and L122 The power control circuit consists of the networks associated with U151 Q151 Q155 and U111 U111 is a directional coupler which detects the forward power of the power module U101 The couple has 21 dB 1 dB coupling at port 2 The RF voltage at the cou pler port 2 is rectified by CR111 C111 R114 C112 and is applied to U151A This signal is amplified by U151A and applied to summing and integrator amplifier U151B gt gt POSITIVE MULTIPLIER GTX GTX LTR LTS 2000 Portable Radios Service Manual The voltage at the second input of the summing amp is supplied by DAC U400 P9 This DAC is controlled by the microprocessor and provides the reference voltage for the control loop The error voltage at the input of U151B 13 produces a voltage at its output which is in turn applied to the drivers Q151 0152 The voltage from Q151 collector is applied to the controlled stage of the power module Frequency Generation Unit The Frequency Generation Unit FGU consists of the following major sections the high stability reference oscillator U210 fractional N synthesizer U220 VCO U260 VCO buffer IC U270 and Rx injection buffer 0280 Q281 and the surrounding components The VCO provides the carrier frequency for the transmitter U270 Tx output and provides
29. to a 0 5V digital level The high speed limited data output MDC and trunking high speed appears at U701 G4 where it connects to U709 P11 The low speed limited data output PL DPL and trunking low speed appears at U701 A4 where it connects to U709 P10 Alert Tone Circuits When the microprocessor needs to give the operator feedback for a good key press or for a bad key press or radio status trunked system busy low battery con dition phone call circuit failures it sends an alert tone to the speaker It does so by sending data to U701 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 or externally using the microprocessor and the ASFIC The allowable internal alert tones are 300 900 and 1800 Hz For exter nal alert tones the microprocessor can generate any tone within the 100 3000 Hz audio band This is accom plished by the microprocessor toggling the output line U709 P7 which is also the same line used to generate low group DTMF data Inside the ASFIC this signal is routed to the external input of the alert tone generator The output of the generator is summed into the audio chain just after the RX audio de emphasis block The tone is then amplified and filtered before passing through the 8 bit digital volume attenuator The tone exits at U701 J4 then is routed to the audio PA circuitry in the transceiver board June 1999
30. to external RF energy When instructed to do so turn off your radio when on board an aircraft Any use of a radio must be in accordance with airline regulations or crew instruc tions OPERATIONAL WARNINGS FOR VEHICLES WITH AN AIR Do not place a portable radio in the area over an air bag or in the air bag deployment area Air bags inflate with great force If a portable radio is placed in the air bag deployment area and the air bag inflates the radio may be propelled with great force and cause serious injury to occupants of the vehicle POTENTIALLY EXPLOSIVE ATMOSPHERES Turn off your two way radio when you are in any area with a potentially explosive atmosphere unless it is a radio type especially qualified for use in such areas for example Factory Mutual Approved Sparks in a potentially explosive atmosphere can cause an explosion or fire resulting in bodily injury or even death BATTERIES Do not replace or charge batteries in a potentially explosive atmosphere Contact sparking may occur while installing or removing batteries and cause an explosion BLASTING CAPS AND AREAS To avoid possible interference with blasting operations turn off your radio when you are near electrical blasting caps in a blasting area or in areas posted Turn off two way radio Obey all signs and instructions NOTE The areas with potentially explosive atmospheres referred to above include fueling areas such as below decks on boats
31. 0 Same as Above TEST MODE Display 2 1 PTT to continuous during the performance check Deviation 2800 Hz but 1200 Hz Voice Modulation Internal Mode PWR MON 2nd channel test frequency atten to 70 input to RF In Out TEST MODE Display 2 0 Remove modulation input Press PTT switch on radio Say four loudly into the radio mic Measure deviation 23 8 kHz but lt 5 0 kHz High Speed Data Modulation Same as Above TEST MODE Display 22 PTT to continuous during the performance check Deviation 22 3 kHz but lt 3 8 kHz DTMF Modulation SIGN Same as Above 2nd channel test frequency TEST MODE Display 23 output at antenna Same as Above Deviation 22 8 kHz but lt 3 8 kHz PL DPL Modulation radios with conventional coded squelch operation only Change frequency to a conventional transmit frequency BW to narrow Conventional coded squelch personality Same as Above Deviation 2500 Hz but lt 1000 Hz Talk around Modulation radios with conventional talk around operation only June 1999 Change frequency to conventional talk around frequency Mode PWR MON deviation attenuation to 70 input to RF In Out Monitor DVM AC volts Set 1kHz Mod Out level for 25mVrms at test set Conventional talk around personality 68P02945C75 A Same as Above Deviation 23 8 kHz but lt 5 0 kHz 5 3 Radio Diagnostic Utilit
32. 25 6to9 V 821 824 MHz Capable 0 00015 Battery Drain Typical Intermodulation 65 dB Emission Standby 65 mA Conducted and Radiat Receive 190 mA ed 48 dBc Transmit 1500 mA Temperature Range Selectivity FM Hum and Noise Operating 30 60 C 25 kHz Adjacent Companion Receiver 40 dB Storage 40 85 C Channel 65 dB Dimensions H x W x D Spurious Rejection 65 dB Distortion 5 GTX total height includes 12 86x2 32x1 09 radio antenna adaptor and 326 53 x59 x27 8 mm antenna LTS 2000 total height 12 86x2 32x1 17 includes radio antenna 326 53 59 29 8 adaptor and antenna Weight w Antenna Freq Stability Modulation Limiting 5 kHz GTX less Battery 0 69 Ibs 314 gr 30 60 C 25 ref 0 00025 821 824 MHz 4 kHz 821 824 MHz 0 00015 GTX Standard Battery 1 20 Ibs 544 gr Capable GTX HNN9701 Battery 1 38 lbs 625 gr LTS 2000 less Battery 0 68 lbs 310 gr LTS 2000 Standard Battery 1 19 lbs 540 gr LTS 2000 HNN9701 Battery 1 37 lbs 621 gr Rated Audio 500 mW Recommended Battery HNN9628 High Capacity NTN7143 Distortion At Rated 5 Audio Channel Spacing 25 kHz Operating for Display 20 60 All specifications subject to change without notice 68P02945C75 A June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual Service Aids Foreword Service Aids The following table lists service aids recommended for working on t
33. 8 This pin is one of the eight chan nels of U709 s 8 bit A D convertor After passing through the 8 bit digital attenuator the audio goes to a buffer amplifier and then exits at U701 J4 where it is 68P02945C75 A 2 7 Theory of Operation Controller routed to the Audio power amplifier circuit in the transceiver board Audio Power Amplifier Resistor R466 sets the input impedance to U409 P2 of the audio power amp The audio PA circuit is a bridged tied load BTL configuration with fixed gain of 40dB developing 500mW rated audio power out put at less than 576 harmonic distortion into the 16 Ohm internal speaker 1 5401 with nominal 7 5 V DC battery supply Maximum audio power output is greater than 1 2 W Audio PA Muting and Output Protection PNP transistor Q410 the audio PA power switch driven by NPN darlington transistor O411 the PA mute amp controls supply to Audio PA U409 P1 U701 A3 is connected to O411 base controlling audio supply Resistors R489 and R490 PNP transis tor Q412 and the current sense circuit monitor current supplied to audio PA U409 P1 Worst case audio PA current at 9 V DC battery voltage maximum volume and full system deviation does not exceed 450 mA at the nominal 16 Ohm load Resistor R488 and capacitor C461 provide an RC time delay for U405 2 a monostable multivibrator circuit A 2 5 V DC reference voltage is fed to U405 2 P6 On radio power up and in normal operation U405
34. Digital Volume Control The radio s RF circuit are constantly producing an out put at the Detected Audio line Whenever the radio is in trunked standby mode it is processing data from the control channel while in conventional standby mode it is always monitoring the squelch line and or sub audible data The detected audio from the transceiver board enters the controller board at connector J700 pin 4 In addition to the detected audio line the transceiver board also provides a squelch noise from U51 P30 into the ASFIC squelch detect circuitry via U701 H7 When the microprocessor is satisfied that it has received the proper data or signal type for unsquelching it sets up the receive audio path and sends data to U701 to do the same within The detected audio will enter U701 through RX IN pin H6 and PL IN pin J7 for further processing Inside the IC the signal first passes through a low pass filter to remove any frequency components above 3000 Hz and then a high pass filter to strip off any sub audible data below 300 Hz Next the recovered audio passes through a de emphasis filter to reduce the effects of FM noise Finally the IC amplifies the audio and passes it through the 8 bit programmable attenuator whose level is set depending on the value of the volume con trol The microprocessor U709 programs the value of the 8 bit attenuator in accordance with the voltage sensed at the volume potentiometer which is con nected to U709 P4
35. Human Exposure to Electromagnetic Fields Low Frequency 0 Hz to 10kHz Env 50166 2 1995 Human Exposure to Electromagnetic Fields High Frequency 10kHz to 300Ghz Proceedings of SC211 8 1996 Safety Considerations for Human Exposure to E M Fs from Mobile Telecommunications Equipment M T E in the Frequency Range 30MHz 6GHz E M F Electromagnetic Fields To assure optimal radio performance and that human exposure to radio frequency electromagnetic energy is within the guidelines set forth in the above standards always adhere to the following procedures Portable Radio Operation and EME Exposure When transmitting with a portable radio hold the radio in a vertical position with its microphone 1 to 2 inches 2 5 to 5 0 centimeters away from your mouth Keep antenna at least 1 inch 2 5 centimeters from your head and body f you wear a portable two way radio on your body ensure that the antenna is at least 1 inch 2 5 centimeters from your body when transmit ting ELECTROMAGNETIC INTERFERENCE COMPATIBILITY NOTE Nearly every electronic device is susceptible to electromagnetic interference if inadequately shielded designed or otherwise configured for electromagnetic compatibility e To avoid electromagnetic interference and or compatibility conflicts turn off your radio in any facility where posted notices instruct you to do so Hospi tals or health care facilities may be using equipment that is sensitive
36. NNA HARMONIC ANTENNA FROM gt COUPLER switch FILTER MATCHING VCO BUFFER Vcontrol P RECTIFIER intial a POWER CONTROL REFERENCE FROM DAC TRANSMITTER BLOCK DIAGRAM LOGIC SECTION FOR FUF1492B AND FUF 1493B 2 1 MHz MOD IN 8 DIGIT SERIAL 4 X 4 KEYPAD LCD DISPLAY EEPROM 4K RX_AUDIO ASFIC DET_AUDIO 28 PIN MIC_IN CONNECTOR _ DISPLAY KEYBOARD DRIVER FROM RF SECTION SPI BUS LOW BA WORMS PROCESSOR OPT HC11K1 COCK_DE SYNT EN gt 4 PEND EN lt SCI ROTI Coa ce DAC lt E PARALLEL BUS ROM 128K 8K June 1999 68P02945C75 A Theory of Operation Frequency Generation Unit The antenna switch circuit consists of two PIN diodes CR161 and CR162 a pi network C126 L161 and part of C162 and one current limiting resistor R163 In the transmit mode TX is applied to the circuit to bias the diodes The shunt diode CR161 shorts out the receiver port and the pi network which oper ates as a quarter wave transmission line transforms thelow impedance of the shunt diode to a high imped ance at the input of the harmonic filter In the receive mode the diodes are both off and hence there exists a low attenuation path between the antenna and receiver ports The harmonic filter consists of part of C121 C122 and L121 C123 and C124 This filter attenuates the har monic of the module to a level better than 55 dBc To optimize the performance of
37. Q51 biased e and IF amp dBm correctely components NO YES Check XTAL filters Y51A amp Troubleshooting Flow Chart for Receiver 4 2 68P02945C75 A June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Troubleshooting Troubleshooting Charts No power Inspect 1 Front cover flexible circuit 2 Voltage regulator NO LED S red light on or not Replace Q400 YES Is control LOW Troubleshoot voltage high Power Control or low circuit Replace PA HIGH module S PA drive OK Troubleshoot 5 VCO 1 Check coupler U111 2 Check PIN diodes 3 Check harmonic filter Inspect repair TX output network Troubleshooting Flow Chart for Transmitter June 1999 68P02945C75 A 4 3 Troubleshooting GTX GTX LTR LTS 2000 Portable Radios Service Ma nual Troubleshooting Charts Vis check of the board OK Correct problem Check 5 gt Regulator YES NO is 15 16 8MHZ Check Check C223 C230 signal at U210 C240 and CR220 U220 pin 142 R210 C232 R232 Fix Connection lt Is 0220 pin 1 0 7 VDC in RX amp 24 3 VDC in TX NO Are waveforms at pins 9 amp 10 triangular Is connection
38. RIB and computer radio connections OK No Was good power on beep s good or bad power on beep present Reprogram radio with RSS Apply power to resent radio turn on Was good power on beep present Main radio board must be replaced Done With power connected to radio and the radio turned on check the following 1 5Vat pin 4 of U704 and pin 71 12 31 41 of U709 2 Check for 14 7456 MHz at pin 73 of U709 3 Check DC at pin 75 of U709 If 4 5V DC check J700 pin 238 for 2 1 MHz signal 4 Check for typical voltages of U709 and U701 Are tones present on power up at U700 pin 18 AUDIO June 1999 Audio problem Trouble shoot audio circuitry Troubleshooting Flow Chart for Controller 68P02945C75 A 4 5 Troubleshooting GTX GTX LTR LTS 2000 Portable Radios Service Ma nual This page intentionally left blank 4 6 68P02945C75 A June 1999 Section 5 Radio Diagnostic Utilities Test Mode Entry Test Mode allows radio checks to be performed in the field To provide a level of protection to the Test Mode entry proceed according to the following sequence 1 Place radio in TRUNKING operation mode and wait for 6 seconds See Quick Start card for instructions on how to enter that mode 2 Turn radio off 3 Remove battery from radio 4 Plug t
39. Radio Diagnostic Utilities Test Modey RR e HER Revo 5 1 Test Mode Channel Selection i tete iei dei iei a ei a dei ete e e ede 5 Test Mode Tx 4 0 20002 2000 0 0000 5 2 Exiting Test 5 2 Fail STe M 5 2 Performance Checks ote nene rtg a e e ehe rrt e e OP E Die LR lu dpt boo 5 3 Section 6 Maintenance Introduction te beide be 6 1 ii 68P02945C75 A June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual Preventive E 6 1 ligera E 6 1 CU CATIA 6 1 Safe Handling ot CMOS Devices iso nia Ue S D ni piures 6 1 Repair Procedures and Techniques essentiae ttt 6 2 Generali a E uicti 6 2 Over Molded Pad Array Carrier OMPAC ooccococcononcononconinnoninnoncnnoncnnoncnnon conca canon cocoa cocoa canon canon canon canon canon canon 6 3 Section 7 Radio Tuning Procedure Radio Tuning Procedure des 7 1 Generali A a iia 7 1 Tuning Proced re ete e ERREUR ERREUR ERE LE e ee eL eR e Legen 7 2 Reference Oscillator Aligninent nodi pret RE 7 2 SI ifs 7 2 RSSI Received Sig
40. Section 3 Accessory Overview The remote speaker microphone is an accessory avail able with the GTX GTX LTR LTS 2000 portable radios This section provides a general description of the remote speaker microphone and describes the operation handling precautions and maintenance of this accessory Description Model HMN9030 Remote Speaker Microphone includes a speaker a microphone a push to talk PTT switch and associated circuitry A cable terminated with a special plug is provided for attaching to the accessory connector on the portable radio When the remote speaker microphone is attached to the radio the speaker in the radio is disabled and receiver audio is connected to the accessory speaker Similarly the accessory microphone is connected to the transmitter and the accessory PTT switch can now control the PTT function in the radio The radio micro phone and PTT switch are still operational but you can listen to the radio only through the accessory speaker IMPORTANT Observe safety information in the radio operating instructions Operation 1 Attach the microphone s accessory connector to the accessory connector on top of the radio 2 While listening to the accessory speaker turn the radio on 3 Operate radio according to operating instruc tions supplied with the radio NOTE The microphone will perform best if it is worn as shown in Figure 3 1 Handling Precautions To
41. Static RAM e U707 LCD Display Driver U704 5 V Voltage Regulator 0709 0703 0705 0706 0707 are powered by 17704 0701 is powered from a 5V Regulator 0708 on Radio Module In addition to the external memory devices U709 has 768 bytes of RAM and 640 bytes of EEPROM Functions The microprocessor has two basic functions interfac ing with the outside world and controlling the internal workings of the radio The microprocessor interfaces directly with the keypad side buttons PTT rotary switch battery low indicator EXT PTT and volume sense The microprocessor constantly monitors these inputs and interprets any changes into commands that control the rest of the radio Some control functions it performs include loading the synthesizer with the desired RF frequency turning the RF PA on or off enabling and disabling audio and data paths and gen June 1999 Controller erating tones Operations and operating conditions within the radio are interpreted by the microprocessor and fed back to the operator as visible the display or audible alert tone indications of current status Normal Operation The regulated 5V output from U704 powers the micro processor U709 and the rest of the digital IC except ASFIC U701 The microprocessor s clock is generated by the ASFIC which has a built in programmable clock synthesizer Clock Synthesizer Upon power up and assuming that the ASFIC receives a proper 2 1 MHz input
42. U PENDULUM N e SPI_DATA POWER PWR_REF 4 2 CONTROL SPI CLCK XB i TX_INJ AMPLIFIER 806 825 MHz TEMPUS PWR REF ACC UDIO lt lt RX AUDIO RED scB4 YELLOW SCB3 D A DAC SEL J mute 5R SCB2 INT SPKR PEND EN SCB1 s MIC EN PREAMP MIC IN INT MIC LOGIC SECTION FOR FUF1190 FUF 1192 FUF1492A FUF1493A FUF1198 24 MHz MOD IN 8 DIGIT SERIAL 4 X4 KEYPAD LCD DISPLAY EEPROM 4K BX AUDIO pone 28 PIN DET_AUDIO CONNECTOR MIC_IN FROM RF SECTION DISPLAY KEYBOARD DRIVER SPI BUS EEE ae PTT u PROCESSOR MONTOR P HCHKi OPT y LOCK DET SYNT EN Pl PEND_EN P Sci ROTI ROT2 j VOL SENSE 3 DAC_SEL gt PARALLEL BUS ROM 128K RAM 8K 2 2 RADIO FUNCTIONAL BLOCK DIAGRAM 68P02945C75 A June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual Transmitter SR 5 V MIXER 1ST 2ND RXIN y BANDPASS y un _ BANDPASS FILTER FILTER LO 3 dBm 1ST IF 2ND DETECTED AUDIO CRYSTAL CRYSTAL FILTER FILTER RECEIVER BLOCK DIAGRAM TXB RX IN 0 dBm POWER ANTE
43. U C D 6 C B 1 A Position 1 2 3 4 5 6 7 8 9 10 11 12 A A 3 1 Position 12 Position 1 Type of Unit Unique Model Variations Hand Held Portable Standard Package Position 2 amp 3 Model Series Position 11 Version ersion Letter Alpha Major Change Position 4 Frequency Band Position 10 Feature Level 806 870 MHz Basic Position 5 Power Level Position 9 Primary System Type 3W Privacy Plus Position 6 Physical Package Position 8 Primary Operation Standard Control with Display Trunked Twin Type Position 7 Channel Spacing 20 25 kHz LTR Model Number H 1 1 U C D 6 C U 1 A Position 12346 6 7 8 9 1011 12 A A ni e gt 1 Position 12 Position 1 Type of Unit Unique Model Variations H Hand Held Portable Standard Package Position 2 amp 3 Model Series Position 11 Version ersion Letter Alpha Major Change Position 4 Frequency Band Position 10 Feature Level 806 870 MHz Basic Position 5 Power Level Position 9 LTR 3W Position 6 Physical Package Position 8 Primary Operation Standard Control with Display Trunked Twin Type Position 7 Channel Spacing 25 kHz LTS 2000 Model Number H 1 0 U C H 6 D C 5 A Position 1 2 4 5 6 7 8 9 10 11 12 A T i Position 12 Position 1 Type of Unit Unique Model Variation Hand Held Portable Standard Package Position 2 amp 3 Model Series Position 11 Version ersion Letter Alpha Beta Major Change Position 4
44. While the attributes of CMOS are many their 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 68P02945C75 A 6 1 Maintenance Repair Procedures and Techniques 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 Repair Procedures and Techniques Refer to the Disassembly and Reassembly section of the manual for pertinent information prior to replacing and substituting parts General Parts Replacement and Substitution Special care should be taken to be as certain as possible that a suspected component is actually the one at fault This special care will eliminate unnecessary unsoldering and removal of parts which could damage or weaken other components or the printed circuit board itself 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 office listed in the Replacement Parts Ordering s
45. X GTX LTR LTS 2000 components Receiver e Transmitter Synthesizer e Controller Troubleshooting Charts Refer to following pages June 1999 68P02945C75 A 4 1 Troubleshooting GTX GTX LTR LTS 2000 Portable Radios Service Ma nual Troubleshooting Charts Very low or no 12 dB SINAD iyd below 1 Check VDC of NO all IFIC pins NO Are VDC of pins 7 9 and 10 of IFIC Is 2nd LO on Noise at spkr when radio is unsqu d Noise at pin 23 of IFIC U51 Check 2nd LO XTAL and components Check ASFIC Is 1st LO 3dBM Check IFIC Are voltages ori 7 see below Check VCO Synth pins OK Check external Inject on channel Check external components signal at RF port components connected to IFIC of mixer U50 connected to IFIC If OK replace U51 Inject on Channel signal at pin 1 of Front End filter FL1 YES Inject signal at IF Port of mixer bare 050 at 45 1 MHz armonic filter and antenna path 3 7VDC at Check 5R junction of R3 and Q405 YES 13 Is 12 dBS 120 Check mixer dBm components y YES NO Check Q1 y and external Inject a 45 1 components MHz signal at C59 YES NO Check 5R Is 12 dBS 112 Is
46. ade 1 Place radio chassis side down on a flat screwdriver Figure 1 4 surface 2 Apply downward pressure to chassis directly above one of the clips opposite PTT switch 3 With a flat blade screwdriver carefully move clip away from tab on chassis to release NOTE Remove both clips opposite the PTT switch first to ease remaining clip removal Front Cover Flexible Circuit 4 Repeat steps 2 and 3 for the remaining three clips Figure 1 4 Remove Ribbon Cable Connector 5 Separate the main board from the chassis Figure 1 6 1 2 68 02945 75 June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual Chassis P NN gt Locking clips Figure 1 6 Separate Main Board From Chassis 6 Separate the flexible circuit tail by undoing the ZIF connector latch Figure 1 7 Figure 1 7 Separate Flexible Circuit Tail Front Housing Board Removal 1 Place the front housing assembly with the front facing down on a padded flat surface This is to avoid the lens from being scratched 2 Remove the front housing shield using tweezers or sharp end screwdriver by undoing the four side catches Figure 1 8 June 1999 68P02945C75 A Radio Disassembly Assembly Radio Reassembly Figure 1 8 Remove Front Housing Shield 3 Separate the front housing board from the front housing Radio Reassembly Front Housing Reassembly Place the front h
47. and techniques Each of these topics provides information vital to the successful operation and maintenance of your radio Preventive Maintenance and 115 2000 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 A detailed inspection of the interior electronic circuitry is neither needed nor desired 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 Internal surfaces should be cleaned only when the radio is disassembled for servicing or repair The only recommended agent for cleaning the external radio surfaces is a 0 5 solution of a mild dishwashing detergent such as JOY in water The only factory recommended liquid for cleaning the printed circuit boards and their components is isopropyl alcohol 70 by volume June 1999 CAUTION The effects of certain chemicals and their vapors have harmful results on certain plastics Aerosol sprays tuner cleaners and other chemicals should be
48. ay thatexposesthe internal electrical circuits of the unit Radios must ship from the Motorola manufacturing facility with the hazardous atmosphere capability and FM Approval label ing Radios will not be upgraded to this capability and labeled in the field June 1999 68P02945C75 A xvii Foreword GTX GTX LTR LTS 2000 Portable Radios Service Manual Important Safety Information Intrinsically Safe Radios A modification changes the unit s hardware from its original design configuration Modifications can only be done by the orig inal product manufacturer at one of its FMRC audited manufacturing facilities Failure to use an FMRC Approved Product unit with an FMRC Approved battery or FMRC Approved accessories specifically approved for that product may result in the dangerously unsafe condition of an unapproved radio combination being used in a hazardous location WARNIN G Unauthorized or incorrect modification of an FMRC Approved Product unit will negate the Approval rating of the product Repair of FWRC Approved Products REPAIRS FOR MOTOROLA FMRC APPROVED PRODUCTS ARE THE RESPONSIBILITY OF THE USER You should not repair or relabel any Motorola manufactured communication equipment bearing the FMRC Approval label FMRC Approved Product unless you are familiar with the current FMRC Approval Standard for repair service Class Num ber 3605 You may want to consider using a repair facility that operates under 3605 repa
49. d Reserved 5 Flash checksum Fatal 05 Yes Illegal tone 6 Codeplug checksum Error 06 Yes Illegal tone 7 1 Codeplug personality Error 06 No Illegal Tone when selected personality has checksum error 8 Codeplug tuning error Error 06 Yes Illegal tone 1 For error no 7 personality system change is allowed although the illegal tone is heard For error no 8 the tem porary illegal tone is heard See the Quick Start card for instructions on how to change personality To exit fail mode power radio off 5 2 68P02945C75 A June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual Performance Checks Performance Checks TEST NAME Table 5 4 Transmitter Performance Checks COMMUNICATION ANALYZER RADIO TEST SET COMMENTS Reference Frequency Mode PWR MON 2nd channel test frequency Monitor Frequency error input at RF In Out TEST MODE Display 20 PTT to continuous during the performance check Frequency error to be 700 Hz Power RF Same as Above TEST MODE Display 2 0 Same as Above Refer to Performance Specification Page XIII Voice Modulation Mode PWR MON 4th channel test frequency atten to 70 input to rf In Out Monitor DVM AC Volts Set 1kHz mod Out level for 0 025Vrms at test set 80mVrms at AC DC test set jack TEST MODE Display 20 Same as Above meter selector to mic Deviation 23 6 kHz but lt 5 0 kHz Low Speed Data Modulation 800 90
50. d during phone interconnect operation They are divided into low group and high group tones The high group tone is generated by U709 P5 strobing U701 G1 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 U709 P7 strobing U701 G2 DTMF Clock at six times the tone frequency Inside U701 the low group and high group tones are summed June 1999 Controller with the amplitude of the high group tone being approximately 24 greater than that of the low group tone and then pre emphasized before being routed to the summer and splatter filter The DTMF waveform then follows the same path as was described for high speed data MDC Data The MDC signal follows exactly the same path as the DTMF high group tone MDC data utilizes MSK mod ulation in which a logic zero is represented by one cycle of a 1200 Hz sine wave and a logic one is 1 5 cycles of an 1800 Hz sine wave To generate the data the microprocessor U709 first programs the ASFIC U701 to the proper filter and gain settings It then begins strobing 701 1 with a square wave from U709 P5 at the same baud rate as the data The output waveform from U701 is fed to the post limiter summer block and then the splatter filter From that point it is routed through the mode attenuator and then out of ASFIC to the transceiver board via _ U701 H8 RX Audio Processing and
51. e IF IC sent to a phase lock detector and demodulated The resulting detected audio output is then sent to the ASFIC to recover the audio Transmitter The transmitter contains five basic circuits a power amplifier an antenna switch a harmonic filter an antenna matching network and a power control Refer to the block diagram and the schematic for more infor mation The power amplifier is an LD MOS module This mod ule contains a 3 stage amplification with a supply volt age at 7 5 V The LD MOS is capable of supplying an output power of 4 4 W with an input signal of 1 mW The power output can be varied by changing the bias ing voltage at the first stage 68P02945C75 A 2 1 Theory of Operation GTX GTX LTR LTS 2000 Portable Radios Service Manual Transmitter VOLUME RF amp AUDIO SECTION Ly VOL CONTROL 851 870 MHz 45 1 MHz FRONT END 2ND MIXER amp DET AUDIO ROTARY gt MODULE NL IST MIKER SIE A DEMODULATOR SWITCH amp LEVEL Loy ROT2 ENCODER 805 9 825 MHz FIND LOCK DET 28 PIN SYNTHESIZER SYNT EN CONNECTOR ANTENNA 16 8 MHz TO LOGIC SECTION HFILTER gt PEND_EN 2 1 MHz TEMP
52. e a chip component using a solder ing iron select the appropriate micro tipped soldering iron and apply fresh solder to one of the solder pads Using a pair of tweezers posi tion the new chip component in place while heating the fresh solder Once solder wicks onto the new component remove the heat from the solder 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 select the hot air hand piece and reflow the solder on the solder pads to smooth it Apply a drop of solder paste flux to each pad Using a pair of tweezers position the new component in place Position the hot air hand piece approximately 1 8 above the component and begin applying heat Once the solder wicks to the component remove the heat and inspect the repair All joints should be smooth and shiny Over Molded Pad Array Carrier OMPAC CAUTION ASFIC U701 is an OMPAC It must be kept in a sealed bag with dessicant in the bag in a dry box as supplied by the Motorola Parts Department prior to use If the OMPAC is ambient for an unknown amount of time or for more than 96 hours then it must be baked for at least eight hours at 260 185 C CAUTION If neighboring OMPAC components are heated above 365 185 C they will suffer die bond delamination and possi ble popcorn
53. eal zo 5 Option Description Factory Mutual FM Batteries X X H236 Fully Approved Factory Mutual Intrinsically Safe Radio includes FA 1200 mAH battery X X H73 Factory Mutual Intrinsically Safe Radio includes 600 mAH battery X X H224 600 mAH Slim Battery deletes standard battery Antenna X X H112 Omit Standard Antenna Miscellaneous X X H415 Bulk Packaging minimum 10 units per line item Chargers X H951 Omit Standard Charger X H437 Add Rapid Rate Charger 110 V X H438 Add Slow Rate Charger 220 V X H439 Add Rapid Rate Charger 220 V June 1999 68P02945C75 A vii GTX GTX LTR LTS 2000 Portable Radios Service Manual GTX GTX LTR LTS 2000 Accessories GTX GTX LTR LTS 2000 Accessories is E GTX GTX LTR LTS 2000 Accessories Accessory Description Charger Pick ups X HTN9803 Single Unit Rapid Charger UK Plug 240 V HTN9702 Single Unit Standard Charger 110 V X X HTN9042 Single Unit Rapid Charger 110 V X X HTN9812 Multiple Unit Rapid Charger 220 V X HTN9719 Vehicular Charger Adapter Bracket 12V for use with Single Unit Rapid Chargers X HTN9811 Multiple Unit Rapid Chargers European Plug 220V X X HTN9944 Wall Mounting Bracket for Multiple Unit Chargers Antenna Pick ups X X NAF5042 806 941 MHz 1 4 Wavel
54. ection of this manual 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 care should be exercised to avoid pulling the plated circuit out of the hole When soldering near the 28 pin connector use care to avoid accidentally getting solder in the connector Also be careful not to form solder bridges between the connector pins Closely examine your work for shorts due to solder bridges RF Board Main Board Replacement Procedures 1 Disassemble the radio as given in Section 1 Radio Disassembly Assembly Main Board Removal 2 Replace the old RF Board with the new one 6 2 68P02945C75 A GTX GTX LTR LTS 2000 Portable Radios Service Manual 3 Reassemble the RF Board as given in Section 1 Radio Disassembly Assembly Chassis Reassembly 4 Reassemble the radio as given in Section 1 Radio Disassembly Assembly Radio Reas sembly 5 Turn the radio ON 6 Tune the radio as given in section 7 Radio Tuning Procedure Logic Board and I O Unit Front Housing Board Replacement Procedures 1 Disassemble the radio as given in Section 1 Radio Disassembly Assembly Front Hous ing Board Removal 2 Replace the old Logic Board and I O Unit with the new
55. ength Whip X X NAF5037 806 870 MHz 1 2 Wavelength Whip Battery Pick ups X X HNN9628 1200 mAh High Capacity Battery X X HNN9701 1200 mAh Fully Approved Factory Mutual Battery X X HNN8308 600 mAh Slimline Battery X X HNN9808 600 mAh Fully Approved Factory Mutual Slim Battery Carrying Accessories Pick ups X X HLN9421 DTMF Standard Leather Carry Case w Swivel X X HLN9426 DTMF Standard Leather Carry Case w Swivel for Fully Approved FM 1200 mAH X X HLN9427 DTMF Standard Leather Carry Case w Swivel for Fully Approved FM 600 mAH HLN9429 DTMF Standard Leather Carry Case w Belt Loop for Fully Approved 1200 mAH X X HLN9431 DTMF Standard Leather Carry Case Belt Loop for Fully Approved FM 600 mAH X X HLN9076 Standard Molded Carry Holder with Belt Clip X X HLN9149 Swivel Belt Loop Adapter for Use w Carry Cases HLN9412 HLN9426 HLN9427 X X HLN9724 Belt Clip X X TDN1022 Swivel includes holster belt and strap X HLN8255 Spring Belt Clip X X NIN5243 Shoulder Strap for use with all Carry Cases Audio RF Accessories X HMN9030 Remote Speaker Microphone w Coil Cord and Clip Back X X HMN9727 Earpiece without Volume Control X X HMN9752 Earpiece with Volume Control X HMN9754 2 Piece Surveillance Microphone PTT and Microphone are combined in 1 Piece X X BDN6720 Ear Receiver with GP300 Style Connector X X FLN8660 Audio Accessory Security Clamp
56. esearch Corporation FMRC lists manufacturers and the products approved by FMRC for use in such locations FMRC has also issued a voluntary approval standard for repair service Class Number 3605 FMRC Approval labels are attached to the radio to identify the unit as being FM Approved for specified hazardous atmospheres This label specifies the hazardous Class Division Group along with the part number of the battery that must be used Their Ap proval mark is shown below Do not operate radio communications equipment in a hazardous atmosphere unless it is a type especially qualified e g Approved for such use explosion or fire may result Do not operate the FMRC Approved Product in a hazardous atmosphere if it has WARNING been physically damaged e g cracked housing An explosion or fire may result Do not replace or charge batteries in a hazardous atmosphere Contact sparking may occur while installing or removing batteries and cause an explosion or fire Do not replace or change accessories in a hazardous atmosphere Contact sparking may occur while installing or removing accessories and cause an explosion or fire Do not operate the FMRC Approved Product unit in a hazardous location with the accessory contacts exposed Keep the connector cover in place when accessories are not used Turn radio off before removing or installing a battery or accessory Do not disassemble the FMRC Approved Product unit in any w
57. ftpots set the signal to noise ratio at which the squelch opens 1 From the SERVICE menu press F2 to select ALIGNMENT TRANSMITTER amp RECEIVER 2 Press F8 to select SOUELCH Adjustment Service Menu F2 Alignment Menu F3 TX Deviation Adjustment F5 Reference Oscillator Warp F7 Transmitter Power F8 Squelch Adjustment F6 Board Replacement Menu F2 Logic or RF Board Replacement Tx Power F4 Warp Reference Frequency F5 Tx Power Calibration F6 Tx Deviation Calibration L F9 Squelch Adjustment Figure 7 2 Service Menu Structure 0 TERTI JEF 15 Min Max Value Value 22858 Figure 7 3 Softpot Concept 7 2 68P02945C75 A June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual 3 Adjustthe UP DOWN arrow key to the mini mum squelch value 4 Setthe RF test generator to the test frequency plus 500 Hz offset 5 Adjust the UP DOWN arrow key until the squelch just closes 6 Monitor for squelch chatter if chatter is present continue to adjust the UP DOWN arrow Wait a few seconds and repeat step 7 7 When no chatter is detected press F8 to pro gram this value Press ENTER to select next softpot adjustment 8 Press F10 F10 to return to the Service menu RSSI Received Signal Strength Indicator Here are the tuning procedures for the SmartZone Models Press F2 to select
58. he 25 pin end of the HKN9857 program ming cable into the RIB The other end of this cable has a battery eliminator 5 Putthe battery eliminator in place of the radio battery 6 Verify that RIB is off 7 Turnradio power supply 7 5 V DC on NOTE You may use the programming cable bat tery as external power supply for the radio 8 Turnradio on The radio enters Test Mode operation Speaker unmutes One beep is heard to indicate operation on the first test frequency default Display shows 4 1 CHANNEL MODE 4 IS INITIAL MODE Test Mode Channel Selection Use the PTT switch for channel selection A short press and de press on the PTT switch button like push will advance the radio to the next channel cyclical Seven channels are available during test mode as shown in the table below Table 5 1 Test Mode Channel Selection Channel Number Rx Frequency Tx Frequency Display 1 851 0125 MHz 806 0125 MHz 1 2 2 869 9875 MHz 824 9875 MHz 2 2 2 866 9750 MHz 3 821 9750 MHz 3 M2 2 3 860 5125 MHz 815 5125 MHz M3 2 4 1 CC1 45 MHz M4 2 5 2 1 2 45 MHz M5 2 6 1 CC3 45 MHz 6 2 7 CCA 1 45 MHz 7 2 1 control channels programmed in association with the selected trunking system 2 M stands for modulation type 0 3 see Table 5 2 3 For
59. he GTX GTX LTR LTS 2000 MOTOROLA NO DESCRIPTION APPLICATION 0180358A56 220 Vac RLN4008 Radio Interface Box Enables communication between the radio and the computer s serial communications adapter 0180357A57 120 Vac RIB Power Supply Used to supply power to the RIB 30 80369B72 for IBM PC ATs Computer Interface Cable Connects the computer s serial communications adapter to or 30 80369B71 for all other the RIB IBM PCs RLN4438 AT to XT Computer Adapter Allows 30 80369B72 to plug into a XT style communications port HKN9857 Programming Test Cable Connects radio to RIB And can be used as a Battery Eliminator RVN4150 for GTX Radio Service Software Software on 3 1 2 in RVN4156 for LTS 2000 RTX4005 Portable Test Set Enables connection to the audio accessory jack Allows switching for radio testing RKN4034 Test Set Cable Connects radio to RTX4005B Test Box FLN8769 Tune and Test Fixture Enables board level maintenance 5880348B33 SMA Female to BNC Female Enables RF connection to radio antenna connector Adapter Test Equipment The following table lists test equipment required to service the GTX GTX LTR LTS 2000 scope 5 20 V cm MOTOROLA DESCRIPTION CHARACTERISTICS APPLICATION R2000 R2400 or Communications This monitor will Frequency deviation meter and signal R2001D with trunking System Analyzer sub
60. his section explains step by step how to disassemble and reassemble the GTX GTX LTR LTS 2000 radio Safety Information When testing and repairing the GTX GTX LTR LTS 2000 radio observe the handling precautions to pre vent unnecessary damage to the radio Minimize handling of static sensitive compo nents and modules Transport and store static sensitive components or assemblies in their original containers on a metal rail Label any package that contains static sensitive components or assemblies Discharge static electricity from the body by wearing a grounded antistatic wrist strap while handling these components Servicing static sensitive components or assemblies should only be done at a static free work station by qualified service technicians Increasing the humidity in the work area minimizes static elec tricity problems Do not allow anything that can generate or hold a static charge on the workstation surface Keep the component leads shorted together whenever possible Pickup components by their bodies Never pick them up by their leads Do not slide the components over any surface Avoid handling components in areas with a floor or work surface covering that can generate a static charge Use a soldering iron connected to earth ground Use only approved anti static vacuum type desoldering tools for removing components June 1999 Radio Disassembly Battery Removal 1 The batter
61. ies GTX GTX LTR LTS 2000 Portable Radios Service Manual Performance Checks TEST NAME Table 5 5 Receiver Performance Checks COMMUNICATION ANALYZER RADIO TEST SET COMMENTS Rated Audio Mode GEN Output level 1 0mV RF 1st Channel test frequency Mod 1 kHz tone at 3 kHz deviation Monitor DVM AC Volts TEST MODE Channel 0 Modulation Type 1 PTT to OFF center meter to Audio PA Set volume control to 2 84 Vrms Distortion Same as above except for distortion Same as Above Same as Above Distortion 5 096 Sensitivity SINAD Same as above except SINAD lower the rf level for 12 dB SINAD Same as Above PTT to OFF center RF input to be 0 35 uV Noise Squelch Threshold only radios with conventional system need to be tested 5 4 RF level set to 1mV RF Same as Above PTT to OFF center meter selection to Audio PA spkr load to speaker Set volume control to 2 84 Vrms As above except change frequency to a conventional system Raise RF level from Zero until radio unsquelches out of TEST MODE select a conventional system Same as Above Unsquelch to occur at 0 3 Preferred SINAD lt 12 dB 68P02945C75 A June 1999 Section 6 Maintenance Introduction This section of the manual describes preventive maintenance safe handling of CMOS devices and repair procedures
62. io Power Supply 7 5 Vdc Note Battery can be used on programming cable making power supply optional Figure 2 Equipment Setup Configuring the RIB and Radio 1 Connect the RIB to the computer Figure 2 2 Plug the large 25 pin end of the HKN9857 programming cable into the RIB The other end of this cable has a battery eliminator 3 Slide the battery eliminator in place of the radio s battery 4 Plug power supply 0180357457 120 Vac or 0180358A56 220 Vac into a wall outlet and connect the other end to the RIB 5 Connect the radio to a power supply and turn the volume control clockwise to turn it on June 1999 68P02945C75 A GTX GTX LTR LTS 2000 Portable Radios Service Manual Notes Notes xvi 68P02945C75 A June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual Foreword Important Safety Information Intrinsically Safe Radios Important Safety Information Intrinsically Safe Radios FMRC Approved Equipment Anyone intending to use a radio in a location where hazardous concentrations of flammable material exist hazardous atmo sphere is advised to become familiar with the subject of intrinsic safety and with the National Electric Code NFPA 70 National Fire Protection Association Article 500 hazardous classified locations An Approval Guide issued by Factory Mutual R
63. ir service approval Incorrect repair or relabeling of any FMRC Approved Product unit could adversely affect the Approval rating of the unit Use of a radio that is not intrinsically safe in a hazardous atmosphere could result WARNING serious injury or death FMRC s Approval Standard Class Number 3605 is subject to change at any time without notice to you so you may want to obtain a current copy of 3605 from FMRC Per the December 1994 publication of 3605 some key definitions and service re quirements are as follows Repair A repair constitutes something done internally to the unit that would bring it back to its original condition Approved by FMRC A repair should be done in an FMRC Approved facility Items not considered as repairs are those in which an action is performed on a unit which does not require the outer casing of the unit to be opened in a manner which exposes the internal electrical circuits of the unit You do not have to be an FMRC Approved Repair Facility to perform these actions The radio support center is at the following address Motorola Radio Support Center 3761 South Central Avenue Rockford Ill 61102 Telephone 800 227 6772 815 489 1000 xviii 68P02945C75 A June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual Foreword Vehicles Equipped with Air Bags Relabeling The repair facility shall have a method by which the replacement of FMRC Approval labels are controlled to ensure that any
64. lect line U709 P35 Transceiver board DAC IC 0400 with select line U709 P26 The LCD Driver uses the master out slave in MOSI line to send data to the display driver IC and the mas ter in slave out MISO line to send data back to the microprocessor U709 Note however that the key pad or any other SPI device can never initiate display data the microprocessor is at all times the SPI master device Thus the MOSI line and MISO line are always in the master configuration LED Control The bicolor LED on the top of the radio is indirectly activated by SPI of U709 via the DAC IC U400 on Transceiver Board When either input to the dual NPN transistor U410 is at logic high the corresponding output pin pin 6 for the green LED pin 3 for the red should be at approximately 4 3 Vdc Note that it is pos sible to have both LED outputs on simultaneously in which case the LED emits a yellow orange light Audio amp Data Circuitry The transmit and receive audio paths are disabled in the standby mode and selectively enabled by the 2 6 68P02945C75 A GTX GTX LTR LTS 2000 Portable Radios Service Manual microprocessor when the radio transmits or receives a signal Also there are minor differences in the func tioning of both paths depending on whether an inter nal or external accessory microphone speaker is being used The radio constantly monitors the received data path for control channel data in trunking opera tio
65. n or sub audible data in conventional operation External PTT Sense Circuits On connecting an external MIC through connector J3 external PTT sense transistor Q408 switches when the external PTT switch is closed Q408 collector voltage is monitored by U709 P4 When collector volt age is logic HIGH the microprocessor configures the radio for transmit mode In PTT equipped accessories the PTT switch is series connected with the external MIC element MIC Amplifier MIC audio from internal MIC 401 is coupled through C429 L404 J3 and 1 403 to the MIC buffer cir cuit U405 1 External MIC plug insertion mechanically disconnects the internal MIC External MIC audio is coupled through L403 to the MIC buffer input The buffer will route the MIC audio into MIC IN U701 B8 through flex and connectors J200 and J700 Inside the ASFIC the MIC audio is filtered to eliminate compo nents outside the 300 3000 Hz voice band pre empha sized and then limited The limited MIC audio is then routed through a summer which is used to add in PL or DPL sub audio band modulation and then to a splatter filter to eliminate high frequency spectral com ponents generated by the limiter After the splatter fil ter the audio is routed to the 8 bit modulation attenuators which are tuned in the factory of the field to set the proper amount of FM deviation The TX audio emerges from the ASFIC at 17701 74 and is dc coupled and applied through fle
66. n reassem bling the radio Using an old gasket could impair the overall seal quality of the radio Insert assembled chassis main board and front shield into radio housing at approximately a 45 degree angle Figure 1 16 Exercise caution while inserting the volume and frequency controls through the housing top IMPORTANT The main board must be inserted into chassis Step 3 before you can secure chassis into radio housing Connect microphone speaker ribbon cable While pressing chassis toward the housing top press the bottom end down into the housing until the bottom housing wall snaps over the chassis retaining studs GTX GTX LTR LTS 2000 Portable Radios Service Manual Make certain that the flexible circuit is completely inside the housing Figure 1 16 Insert Chassis into Housing NOTE The chassis should snap firmly into place and the flexible circuit should be placed nicely inside the radio 5 Replace the knobs antenna and battery 68P02945C75 A June 1999 Section 2 Theory of Operation Overview This section provides a detailed theory of operation for the GTX GTX LTR LTS 2000 and its components the receiver transmitter frequency generation circuitry controller and audio amp data circuitry Receiver The receiver of the GTX GTX LTR LTS 2000 radios consists of 4 major blocks the front end module dou ble balanced mixer 45 1 MHz IF and back end IF IC
67. nal Strength Indicator sessseeeeeneene tentent tenente ntes 7 8 Transmitter i 7 3 Transmit Deviation Balance Compensation amp Deviation 7 3 Transmit Deviation Limit 7 3 Section 8 Schematic Diagrams Circuit Board Details and Parts Lists Schematic Diagram for FUF5590A FUF55914A RF Board Wiring 8 2 Schematic Diagram for FUF5590A FUF5591A RF Board Receiver Module 8 3 Schematic Diagram for FUF5590A FUF5591A RF Board Synthesizer Module 8 4 Schematic Diagram for FUF5590A FUF5591A RF Board Transmitter 8 5 Circuit Board Details for FUF5590A FUF55914A 58 8 6 Parts Lists for FUF5590A RF B Oad l 8 7 Parts Lists for FUF5591A RF E oa d nennen r 8 10 Circuit Board Details Schematic Diagram amp Parts List for FLN8517A Battery Filter Board 8 11 Parts Lists for FENSS17A Battery Filter Board 8 11 Circuit Board Details for FLN8514A F LN9053A FLN9064A HLN9859 HLN9860 FEN1648 and FENTOS Lone Bi 8 12 Schematic Diagram for FLN8514A FLN9053A FLN9064A HLN9859 HLN9860 FEN 1648 and FENTOS6 Logic Boada 8 13 Parts Lists for FLN8514A Logic 8 14 Parts Lists for FENIOSSA
68. nt of the new chip carrier Pre pare the sight by using solder wick and a sol dering iron to remove all solder from the solder pads on the circuit board If a power desoldering tool is available it can be used instead of the solder wick Clean the solder pads with alcohol and a small brush Dry and inspect Ensure that all solder is removed Once the preparation is complete place the circuit board back in the R 1319A s circuit board holder Add solder paste flux in the trench of the flux block and spread it using a one inch putty knife Flux the OMPAC by placing it in the trench of the flux block Once the flux is applied place the OMPAC on the circuit board making certain that it is oriented correctly on the board Position the heat focus head over the OMPAC and lower it to approx imately 1 8 0 3cm over the carrier Using the same heat and airflow setting used to remove the OMPAC turn on the heater and wait for the carrier to reflow heating and reflow should take longer than 60 seconds Once the carrier reflows raise the heat focus head and wait approximately one minute for the part to cool Remove the circuit board and inspect the repair No cleaning should be nec essary Removing and replacing the shields will be done with the R 1319A using the same heat and airflow profile used to remove and replace OMPAC components Place the circuit board in the R 1319A s holder Select the proper heat focus head and attach it to
69. on U701 P38 which comes from the transceiver board the ASFIC outputs a 7 776 MHz CMOS square wave 0 5Vpp logic on U701 P30 which connects to the EXTAL input of the microprocessor U709 P73 The microprocessor oper ates at 1 4 of this frequency which in this case com putes to 1 944 MHz In particular the E clock output U709 P72 will be a 50 duty cycle square wave at this frequency Bus Operation The microprocessor operates in expanded memory mode and executes firmware contained in OTP FLASH ROM U705 The microprocessor uses a non multiplexed address data bus consisting data lines DO through D7 and address lines 0 17 In addition the microprocessor has integrated chip select logic so that external memories can be accessed without the need for external address decoder gates These chip select signals are provided by U709 P28 and P29 When the controller board is functioning normally microprocessor s address and data lines should be tog gling at CMOS logic levels Specifically the logic high levels should be between 4 8 and 5 0V and the logic low levels should be between 0 and 0 2V RAM The on chip 768 byte static RAM from U709 provides some scratch pad memory with the bulk of it coming from the external 8 or 32Kbyte SRAM U706 External SRAM accesses are indicated by the U709 P28 Nor mally SRAM is accessed less often than the FLASH 10705 i e the number of transitions per second on U705 chip
70. ousing on a cushioned flat surface with the front facing down Place the keypad into the front housing Figure 1 9 Place the board on the keypad in the housing Figure 1 9 Figure 1 9 Place Keypad Into Front Housing Radio Disassembly Assembly Radio Reassembly 4 Fold the LCD flexible circuit Figure 1 11 Make sure the LCD flexible circuit is outside 5 Place the front housing shield into the front housing using the four slots on the front housing wall as the guide Figure 1 10 Figure 1 10 Place Front Housing Shield Into Front Housing 6 Press down the shield at the four tabs until tabs lock into the front housing catches 7 Slidein the lightpipe Figure 1 11 LCD flexible circuit A 7 Figure 1 11 Slide In Lightpipe Front Housing Reassembly Basic Model 1 Place the front housing on a cushioned flat surface with the front facing down 2 Place the board in the housing see the following figure 1 4 68P02945C75 A GTX GTX LTR LTS 2000 Portable Radios Service Manual 3 Place the front housing shield into the front housing using the four slots on the front housing wall as the guide see the following figure 4 Press down the shield at the four tabs until tabs lock into the front housing catches Chassis Reassembly 1 Place chassis on a flat surface with the battery rails downward Insert the flexible circuit tail end marked RF into the ZIF connecto
71. ponents on which they are used are listed at the end of the table MOTOROLA NO DESCRIPTION APPLICATION 6680387A59 Extractor 2 contact Removal of discrete surface mounted devices 6680387 64 Heat controller with safety stand 6680387 A65 Safety stand only 0180381B45 110 Vac or 250 Surface mount thru hole repair Temperature controlled self contained solder 0180300 06 220 Vac station ing desoldering repair station for installation and removal of surface mounted devices 8180369E97 Flux holder applicator arrays for repair Allows for the of flux to be applied to pad grid 1105139W02 30cc plastic syringe and flux paste For use with flux holder applicator 8180369E97 0180386A81 Miniature digital readout soldering station incl 1 64 micropoint tip 0180386A78 Illuminated magnifying glass with lens at tachment 0180386A82 Anti static grounding kit Used during all radio assembly and disassem bly procedures 6684253C72 Straight prober 6680384A98 Brush 1010041 86 Solder RMA type 63 37 0 020 diameter 1 Ib spool 1080370B43 RMA liquid flux 1319 Shields and surface mounted component Removal of surface mounted integrated cir IC removal rework station order all heat cuits focus heads separately xii 68P02945C75 A June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual Foreword Service Tools
72. r on the RF board and lock the connector by engaging the latch Figure 1 12 3 Insert main board into chassis using alignment pins as a guide Figure 1 12 4 Place front shield on main board using tabs as a guide Figure 1 12 June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual Radio Disassembly Assembly Radio Reassembly Figure 1 14 Replace Gasket 8 Place the chassis assembly and front housing assembly on a flat surface with the top face of housing in a reverse and opposite direction Figure 1 15 Figure 1 12 Align Pins 5 Press down on front shield until chassis main board and front shield are seated tightly together 6 Hooklocking clips first to the chassis tab then push clips over on shield with thumb until clips lock into front shield holes Figure 1 13 Figure 1 15 Place Chassis Opposite of Front Housing Radio Reassembly 1 Insert the flexible circuit tail from chassis to ZIF connector on front housing board Lock the tail in the ZIF connector by pressing down the latch Figure 1 13 Reinsert Locking Clips NOTE Flexible circuit tail must be fully inserted 7 Replace chassis gasket Figure 1 14 to prevent short circuiting June 1999 68P02945C75 A 1 5 Radio Disassembly Assembly Radio Reassembly 1 6 NOTE The gasket helps keep the radio free from unwanted dirt dust and water We rec ommend using a new lubricated gasket part no 3280545C01 whe
73. relabeling is limited to units that were originally shipped from the Manufacturer with an FM Approval label in place FMRC Approval labels shall not be stocked by the repair facility An FMRC Approval label shall be ordered from the original manu facturer as needed to repair a specific unit Replacement labels may be obtained and applied by the repair facility providing satisfactory evidence that the unit being relabeled was originally an FMRC Approved unit Verification may include but is not limited to a unit with a damaged Approval label a unit with a defective housing displaying an Approval label or a customer invoice indicating the serial number of the unit and purchase of an FMRC Approved model Do Not Substitute Options or Accessories The communications equipment package that Motorola submits to FMRC for testing and approval is tested as a system that consists of the communications unit itself and the battery antenna and other options or accessories that make up the rest of the package to be approved This approved package must be strictly observed and there must be no substitution of items even if the substitute you wanted to consider appears as an approved accessory elsewhere in the Guide for some other communications equipment unit Approved configurations are listed by FMRC Approved Product in the annual Approval Guide published by FMRC That guide and the Approval Standard Class Number 3605 document can be ordered from the following addres
74. rola Parts If only a generic part is listed the part is not normally available through Motorola If no parts list is shown generally no user serviceable parts are available for the kit Motorola Radio Support Center Motorola United States Federal Government Depot 3761 South Central Avenue 77940 Penn Randall Place Rockford IL 61102 4294 Upper Marlboro MD 20772 2627 1 815 489 1000 1 800 969 6680 1 301 736 4300 Parts Information 7 30 M to 7 00 P M Central Standard Time Monday through Friday Chicago U S A Domestic U S A 1 800 422 4210 or 847 538 8023 1 800 826 1913 or 410 712 6200 Federal Government TELEX 280127 FAX 1 847 538 8198 FAX 1 40 712 4991 Federal Government Domestic U S A after hours or weekends 1 800 927 4357 International 1 847 538 8023 Motorola Parts Accessories and Aftermarket Division Accessories and Aftermarket Division United States and Canada Attention International Order Processing Attention Order Processing 1313 E Algonquin Road 1313 E Algonquin Road Schaumburg IL 60196 Schaumburg IL 60196 Customer Service Order Entry Parts Identification 1 800 422 4210 Voice 1 847 538 0021 Voice 1 847 538 8198 FAX 1 847 538 8194 FAX Manual Revisions Changes which occur after this manual is printed are described in IMRs These IMRs provide complete information on changes including pertinent parts listing data Comp
75. rough 100k ohms of resistance WARNING If the aluminum foil is connected directly to ground be cautious of possible electri cal shock from contacting the foil at the same time as other electrical circuits When soldering be sure the soldering iron is grounded Prior to replacing circuit components or touch GTX GTX LTR LTS 2000 Portable Radios Service Manual necessary to touch the microphone cartridge and associated wiring Replacement microphone cartridges should be kept in conductive packaging until they are placed in unit Maintenance Refer to the schematic diagram shown in Figure 3 2 the exploded view shown in Figure 3 3 and the parts lists Every part in the microphone is identified and illustrated for assistance in removal and replacement If necessary the external surfaces of the remote speaker microphone may be cleaned with a 0 5 solution of mild dishwashing detergent in water one teaspoon of detergent in a gallon of water Electrical Parts List HMN9030 Electrical Parts List REFERENCE MOTOROLA ing the microphone cartridge be sure to dis SYMBOL PART NO DESCRIPTION charge any static buildup Since voltage capacitor fixed 10 100 V un differences can exist across the human body it is less otherwise stated 2113740A53 chip 82 pF 5 50V recommended that only one hand be used if it is 2113740467 chip 330 pF 45
76. s Training Resource Center Publications Order Processing Dept Factory Mutual Engineering and Research 1151 Boston Providence Turnpike PO Box 9102 Norwood MA 02062 Telephone 617 762 4300 Vehicles Equipped with Air Bags When planning the installation of communication equipment in a vehicle with one or more air bags proceed as follows Vehicles equipped with air bags An air bag inflates with great force DO NOT place objects including communication equipment in the area over the air bag or in the air bag deployment area If the communication equipment is improperly installed and the air bag inflates this could cause serious injury WARNING Installation of vehicle equipment should be performed a professional installer technician qualified in the requirements for such installations An air bag s size shape and deployment area can vary by vehicle make model and front compartment configuration e g bench seat vs bucket seats e Contact the vehicle manufacturer s corporate headquarters if necessary for specific air bag information for the vehicle make model and front compartment configuration involved in your communication equipment instal lation June 1999 68P02945C75 A xix GTX GTX LTR LTS 2000 Portable Radios Service Manual This page intentionally left blank 68P02945C75 A June 1999 Section 1 Radio Disassembly Assembly Overview T
77. s on this page will be available from the Accessories and Aftermarket Division June 1999 68P02945C75 A Foreword GTX GTX LTR LTS 2000 Portable Radios Service Manual LTS 2000 SmartZone and SmartNet Plus Portable Radios Model Chart LTS 2000 SmartZone and SmartNet Plus Portable Radios Model Chart H10UCH6DC5AN LTS 2000 Portable Radio For Existing Users Only H10UCH6DC5BN LTS 2000 Portable Radio 038 SmartZone H10UCH6DC5BN LTS 2000 Portable Radio 037 SMARTNET Plus Item Description X FLN2395A Front Housing Assembly with Logic Board for factory use only X FLN2395B Front Housing Assembly with Logic Board for factory use only X FLN2550A Front Housing Assembly with Logic Board for factory use only X FEN1649A Logic Board amp I O Unit Part of FLN2395A X FEN1665A Logic Board amp I O Unit Part of FLN2395B X FEN1667A Logic Board amp I O Unit Part of FLN2550A X X X FUF1193A 1 5 ppm RF Unit X X X FLN2394A Chassis Assembly Part of FUF1193A x Indicates one of each is required Not all kits on this page will be available from the Accessories and Aftermarket Division NOTE Items with suffix may be upgraded in the future vi 68P02945C75 A June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual GTX GTX LTR LTS 2000 Options GTX GTX LTR LTS 2000 Options GTX GTX LTR LTS 2000 Options 5 r
78. select pin 30 should be 5 15 times higher than those on U706 pin 20 EEPROM The radio codeplug storage is provided by 640 byte EEPROM with an additional memory space 4 Kbyte for GTX models and 4 Kbyte or 8 Kbyte for LTS mod 68P02945C75 A 2 5 Theory of Operation Controller els provided by the external EEPROM 0703 There are three basic types of codeplug information informa tionon the trunked system on which the radio is autho rized to operate information on the conventional system which is either of the repeater or talk around type on which the radio is authorized to operate and information on the configuration and tuning of the radio itself Tuning information is normally located in the internal EEPROM of U709 SPI Interface The microprocessor communicates to several ICs and modules through a dedicated on chip serial periph eral interface SPI port which consists of transmit data line MOSI U709 P1 receive data line MISO U709 P80 and clock line SCK U709 P2 In addition each IC that can be accessed by the microprocessor using the SPI has a read write select line associated with it The ICs or circuits and their associated select lines are e EEPROM 0703 with select line U709 P3 e ASFIC 0701 with select line U709 P34 e LCD Driver 0707 with select line U709 P23 e OTP FLASH ROM 0705 with select line U709 P29 e SRAM 0706 with select line U709 P28 Transceiver board Synthesizer U201 with se
79. stitute for items with generator for wide range troubleshoot option an asterisk ing and alignment R1049A Digital Multimeter Two meters recommended for AC DC voltage and current measurements 51100 Audio Oscillator 67 to 161 4Hz tones Used with service monitor for injection of PL tones 51053D SKN6009A AC Voltmeter Power 1 mV to 300 V 10 Megohm Audio voltage measurements SKN6001A Cable for meter Test input impedance leads for meter R1053 Dual trace Oscillo 20 MHz bandwidth Waveform measurements S1350C ST1215B Wattmeter 50 Ohm 5 accuracy Transmitter power output measurements VHF ST1223B UHF Plug in Elements VHF 10 W max 0 1000 MHz T1013A amp UHE Dummy 300 W Load S1339A RF Millivolt Meter 100 uV VRE 10 KHzto RF level measurements 1 2 GHz R1013A SINAD Meter Receiver sensitivity 513470 or DC Power Supply 0 20 Vdc 0 5 Amps Bench supply for 10Vdc 513480 prog June 1999 68P02945C75 A xi Foreword GTX GTX LTR LTS 2000 Portable Radios Service Manual Service Tools Service Tools The following table lists the tools recommended for working on this family of radios these tools are also available from Motorola Note that the R 1070A workstation requires the use of a specific heat focus head for each of the components on which this item is used Each of these heat focus heads must be ordered separately The individual heat focus heads and the com
80. the local oscillator LO injection signal for the Rx injection buffer U270 Rx out put The phase locked loop PLL circuit is provided by the fractional N synthesizer IC The output of the VCO is amplified by the prescaler buffer routed through a low pass filter and applied to the prescaler dividers of the synthesizer The divide ratios are determined from information stored in mem ory and bussed to the synthesizer by way of the micro controller The divide ratio determines the VCO frequency The resulting VCO buffer signal is applied to a comparator in the synthesizer The synthesizer comparator also receives a reference frequency by way SWITCHING CCTS FOR VCO AND BUFFER 16 8 MHz N REF osc 0210 0220 FRACTIONAL N REFERENCE Y LOOP VES FILTER COUNTER FOR MOD OUT MULTIPLIER TXVCO FRACTIONAL PRE SCALER U260 AID DIVIDER DIVIDER OUT INJ gt BUFFER MIXER BUFFER gt TX OUT MATCHING gt RF T TX BUFFER Prescaler BUFFER U270 VCO BUFFER IC y SYNTHESIZER LOW PASS FILTER 2 1 MHz REFERENCE CLOCKTO MODULATING ASFIC SIGNAL FGU CIRCU 68P02945C75 A ITS June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual of reference divider
81. tion 7 Radio Tuning Procedure Radio Tuning Procedure General An IBM PC personal computer and RSS Radio Service Software are required to align the radio Refer to the applicable RSS Manual for installation and setup procedures for the software To perform the alignment procedures the radio must be connected to the PC RIB Radio Interface Box and Test Set as shown in Figure 7 1 SERVICE screens read and program the radio codeplug directly you do NOT have to use the RSS GET SAVE functions to program new tuning values SYSTEM ANALYZER R2000 SERIES AUDIO OUT RKN4034 OO OO OO RTX4005B O O PORTABLE TEST SET BATTERY ELIMINATOR RTX4005B HKN9857 110 VAC Figure 7 1 June 1999 RF CABLE TEST SET CABLE RADIO PROGRAMMING CABLE CAUTION Do NOT switch radios in the middle of any SERVICE procedure Always use the EXIT key to return to the MAIN menu screen before disconnecting the radio Improper exits from the SERVICE screens may leave the radio in an improperly configured state and result in seriously degraded radio or system performance The SERVICE screens use the concept of the Softpot an analog SOFTware controlled POTentiometer used for adjusting all transceiver alignment controls Each SERVICE screen provides the capability to increase or decrease the softpot value with the COMPUTER
82. uter 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 pro grams 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 M MOTOROLA Table of Contents Table of Content Safe and Efficient Operation of Two way Inside front cover GTX GTX LTR Portable Radio Model LTS 2000 LTS 2000 SmartZone and SmartNet Plus Portable Radios Model vi GIX GIXLETR LTS 2000 Options totae nette ert der reve a ud HR e E Rd aede vii 6 2000
83. x and connectors J700 and J200 to the synthesizer U201 pin 8 TX Data Circuits There are four major types of transmit data sub audi ble data PL DPL Connect Tone that gets summed with voice high speed data for trunking control chan nel communication DTMF data for telephone commu nication in trunked and conventional systems and MDC data for use in Motorola proprietary MDC sys tems The deviation levels of the latter three types are tuned by a 5 bit digital attenuation inside the ASFIC For each data type and each band split there is a dis tinct set of tuning values that are programmed into the ASFIC before the data is generated and transmitted June 1999 GTX GTX LTR LTS 2000 Portable Radios Service Manual Sub Audible Data PL DPL Sub audible data is composed of low frequency PL and DPL waveforms for conventional operation and connect tones for trunked voice channel operation The trunking connect tone is simply a PL sine wave at a higher deviation level than PL in a conventional sys tem 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 sys tem Only one type of sub audible data can be generated by U701 at any one time The process is as follows using the SPI the microprocessor programs the ASFIC
84. y latch is located at the bottom of the radio Figure 1 1 Press and hold the battery latch towards the front of the radio Figure 1 1 Press Battery Latch 2 Press the battery housing against the radio while sliding the battery housing down until it is free of the chassis rails Figure 1 2 Battery housing Figure 1 2 Slide Battery Housing 3 To remove the battery pull it straight out and away from the radio Chassis Removal 1 Pullthe control knobs straight off 68P02945C75 A 1 1 Radio Disassembly Assembly GTX GTX LTR LTS 2000 Portable Radios Service Manual Radio Disassembly 2 Unscrew the antenna counter clockwise until 6 Pull the chassis out and away from the it is detached from the radio housing as shown by the arrow Figure 1 4 and beware of the front cover flexible circuit 3 Carefully pry the chassis up on both sides near the bottom with a flat blade screwdriver 7 Figure 143 Remove the flexible circuit using a flat blade screwdriver or manually unlatching the ZIF connector Figure 1 5 Figure 1 3 Remove Chassis Figure 1 5 Unlatching Zif Connector 4 Liftthe chassis approximately halfway out Main Board Removal IMPORTANT You must disconnect the ribbon cable before completely removing the chassis The front shield holds the main board onto the chassis To remove the front shield 5 Remove the ribbon cable connector from the o main board using pliers or a flat bl

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