Motorola HT750 Service Manual

Motorola HT750 - UHF/VHF/Low Band - Radio Manual

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  • Motorola HT750 | Service Manual - Page 1
    HT750 HT1250 HT1250•LS HT1550•XLS MTX850 MTX850•LS HT1250•LS+ MTX8250 MTX8250•LS MTX950 MTX9250 Portable Radios Professional Radio Basic Service Manual Motorola, Inc. 8000 West Sunrise Boulevard Fort Lauderdale, Florida 33322 68P80906Z54-D
  • Motorola HT750 | Service Manual - Page 2
    of Motorola-approved antennas, batteries, and other accessories, visit the following web site which lists approved accessories: http://www.motorola.com/cgiss/index.shtml. Computer Software Copyrights The Motorola products described in this manual may include copyrighted Motorola computer programs
  • Motorola HT750 | Service Manual - Page 3
    1-1 1.1 Scope of Manual 1-1 1.2 Warranty and Service Support 1-1 1.2.1 Warranty Period and Return Instructions 1-1 1.2.2 After Warranty Period 1-1 1.2.3 Piece Parts Availability 1-2 1.2.4 Technical Support 1-3 1.3 Radio Model Information 1-4 Chapter 2 Intrinsically Safe Radio Information
  • Motorola HT750 | Service Manual - Page 4
    Front Cover Reassembly 3-11 3.7.7 DTMF Retrofit Kit Procedure (Optional Upgrade Procedure 3-12 3.7.8 Option Board Installation 3-13 3.8 HT750 Radio Exploded Mechanical View and Parts List 3-15 3.8.1 HT750 Exploded View 3-15 3.8.2 HT750 Exploded View Parts List 3-16 3.8.3 HT1250 and HT1250•LS
  • Motorola HT750 | Service Manual - Page 5
    /Test Cable 3-37 Chapter 4 Transceiver Performance Testing 4-1 4.1 General ...4-1 4.2 RF Test Mode ...4-1 4.3 Test Frequencies for Display and Non-Display Radios 4-6 4.4 Receiver Performance Tests 4-7 Chapter 5 Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone
  • Motorola HT750 | Service Manual - Page 6
    /MTX9250/MTX8250•LS Accessories 7-1 7.1.1 Antennas 7-1 7.1.2 Carrying Accessories 7-2 7.1.3 Carry Cases 7-2 7.1.4 Chargers 7-3 7.1.5 Vehicular Accessories 7-3 7.1.6 Batteries 7-3 7.1.7 Adapters 7-3 7.1.8 Miscellaneous 7-3 7.1.9 Service Aids 7-4 7.1.10 Audio Accessories 7-4 7.1.11 Option
  • Motorola HT750 | Service Manual - Page 7
    800 MHz (Privacy Plus 8-11 8.13 900 MHz (Privacy Plus 8-12 8.14 Specifications, HT750 Radio 8-13 8.15 Specifications, HT1250 Radio 8-15 8.16 Specifications, HT1250•LS+ Radio 8-17 8.17 Specifications, HT1550•XLS Radio 8-19 8.18 Specifications, MTX850/MTX8250 (800 MHz), MTX950/MTX9250 (900 MHz
  • Motorola HT750 | Service Manual - Page 8
    viii
  • Motorola HT750 | Service Manual - Page 9
    : Programming/Test Cable Schematic 3-38 Figure 4-1: Radio Side Button Location 4-3 Figure 4-2: HT1550•XLS Radio Side Button Location 4-3 Figure 4-3: Two-Line Display 4-4 Figure 4-4: Four-Line Display (HT1550•XLS 4-4 Figure 5-1: Radio Tuning Test Equipment Setup 5-2 Figure 5-2: CPS Programming
  • Motorola HT750 | Service Manual - Page 10
    x Notes
  • Motorola HT750 | Service Manual - Page 11
    model number EX: AAH25RCH6GB6AN 4-5 Table 4-3: Test Channel Spacing (Side Button 2 4-5 Table 4-4: Test Frequencies (Using the Channel Selector Switch 4-6 Table 4-5: Receiver Performance Checks 4-7 Table 4-6: Transmitter Performance Checks 4-8 Table 5-1: Software Installation Kits Radio Tuning
  • Motorola HT750 | Service Manual - Page 12
    xii Notes
  • Motorola HT750 | Service Manual - Page 13
    After the Warranty period, Motorola continues to support its products in two ways: 1. Motorola's Radio Parts and Service Group offers repair service to users and dealers at competi- tive prices. 2. The Motorola Customer Care and Services Division (CCSD) supplies individual parts and mod- ules that
  • Motorola HT750 | Service Manual - Page 14
    Online users can access our online catalog at https://www.motorola.com/businessonline To register for online access, please call 800-814-0601. Mail Orders: Send written orders to the following addresses: Replacement Parts/ Federal Government Orders: Test Equipment/Manuals/ Crystal Service
  • Motorola HT750 | Service Manual - Page 15
    Motorola Technical Support. When contacting Motorola Technical Support, keep the product model number and the unit's serial number handy. For service, contact one of the following Depots. Please call and confirm your return before sending the unit to the depot for service. Motorola Radio Support
  • Motorola HT750 | Service Manual - Page 16
    RF output power, frequency band, protocols, and physical packages. The example below shows one portable radio model number and its specific characteristics. Table 1-1:Radio Model Number (Example: AAH25KDC9AA3AN) Type of Model Unit Series Freq. Band Power Physical Channel Level Packages Spacing
  • Motorola HT750 | Service Manual - Page 17
    before removing or installing a battery or accessory. • Do not disassemble an FMRC Approved Product unit in any way that exposes the internal electrical circuits of the unit. Radios must ship from the Motorola manufacturing facility with the Intrinsically Safe, hazardous atmosphere capability and
  • Motorola HT750 | Service Manual - Page 18
    Intrinsically Safe Radio Information Modifications can only be made by the original product manufacturer (Motorola) at one of its FM audited manufacturing facilities. ! W A R N I N G • Failure to use an FMRC Approved portable radio unit with an FMRC Approved battery or FMRC Approved accessories
  • Motorola HT750 | Service Manual - Page 19
    Intrinsically Safe Radio Information 2-3 2.2.3 Do Not Substitute Options or Accessories The Motorola communications equipment certified by Factory Mutual is tested as a system and consists of the FM Approved portable, FM Approved battery, and FM Approved accessories or options, or both. This FM
  • Motorola HT750 | Service Manual - Page 20
    2-4 Intrinsically Safe Radio Information Notes
  • Motorola HT750 | Service Manual - Page 21
    the front cover, housing assembly, and battery case. These surfaces should be cleaned whenever a periodic visual inspection reveals the presence of smudges, grease, and/or grime. NOTE: Internal surfaces should be cleaned only when the radio is disassembled for service or repair. The only recommended
  • Motorola HT750 | Service Manual - Page 22
    are replaced, identical parts should be used. If the identical replacement part is not locally available, check the parts list for the proper Motorola part number and order the part from the nearest Motorola Communications parts center listed in the "Piece Parts" section of this manual (See page
  • Motorola HT750 | Service Manual - Page 23
    the radio: l 3/16" flat blade screwdriver l Penknife-size screwdriver l TORX™ T6 screwdriver If a unit requires more complete testing or service than is customarily performed at the basic level, send this unit to a Motorola Authorized Service Center. (See Chapter, section 1.2.4 Technical Support on
  • Motorola HT750 | Service Manual - Page 24
    two battery-release buttons. b. With the buttons pulled down, the top of the battery will fall from the radio. c. Remove the battery completely from the radio. Maintenance Battery Release Buttons Battery Figure 3-1: Battery Removal 3. Remove the antenna. 3. Pull the volume and channel selector
  • Motorola HT750 | Service Manual - Page 25
    cover by pushing the 3/16" flat-blade screwdriver down, and rotating the handle of the tool over and behind the base of the radio. This prying action forces the thin inner plastic wall toward the base of the radio, releasing the two chassis base tabs. Radio Figure 3-3: Chassis Removal ! CAUTION
  • Motorola HT750 | Service Manual - Page 26
    , the DTMF Retrofit Kit Procedure can be performed. (See section 3.7.7 DTMF Retrofit Kit ground contact from the top corner boss of the radio chassis. 3.6.3 Keypad, Display, and Keypad/PassPort is required, lift the microphone flex circuit up, and carefully remove the microphone and its boot from the
  • Motorola HT750 | Service Manual - Page 27
    . Repeat this procedure for the four remaining retainer arm tabs. Speaker-Microphone Flex Circuit Tail Flat Blade Screwdriver Keypad Retainer Arm Tabs (4) Retainer Top Hooks Retainer Figure 3-6: Remove Retainer 4. Note that the two "top hooks" are still held underneath the front cover-right
  • Motorola HT750 | Service Manual - Page 28
    NOTE: The speaker-microphone assembly flex circuit goes through the front cover wall to the outside wall. To replace this assembly, you must peel-off the universal connector escutcheon label. The existing escutcheon cannot be reassembled; a new part must be used. (See item number 10 on the exploded
  • Motorola HT750 | Service Manual - Page 29
    bottom of the boot. Universal Connector Tail Speaker Speaker Orientation Tab (12:00 Position) Microphone Boot Microphone Speaker Microphone Flex Circuit Assembly Figure 3-6: Removal Speaker-Microphone Assembly 3.6.5 PTT Disassembly If required, the PTT bezel and the PTT seal assembly can be
  • Motorola HT750 | Service Manual - Page 30
    PTT assembly against the front cover opening. NOTE: Look inside the front cover to make sure the T-tab is fully engaged with the front cover. If necessary, press the T-tab toward the top of the radio until it becomes fully engaged. 3.7.3 Speaker, Microphone, and Universal Connector (item number 17
  • Motorola HT750 | Service Manual - Page 31
    to the Radio's Body antenna nut insulator is correctly replaced by pushing it all the way to the top of the antenna nut. 5. Replace the battery contact seal (if necessary) surrounding the battery connectors to hold the flex circuits to the main board. 4. Slide the volume potentiometer and frequency
  • Motorola HT750 | Service Manual - Page 32
    to a DTMF model, replace the existing front cover kit with kit number HLN9984 and follow the reassembly steps to reassemble the upgraded radio. (See paragraph 3.7 for details about reassembly.) To activate the retrofit using the radio software, follow these steps: 1. Start the Customer Programming
  • Motorola HT750 | Service Manual - Page 33
    on the jumper flex point to the correct way of inserting the flex into the connector. 3. Discard the keypad backer board. 4. The "breakaway" tab at the top of all option boards contains an extra row of keys and is used to accommodate other radio models. 5. Break-off and discard the option board tab
  • Motorola HT750 | Service Manual - Page 34
    3-14 Maintenance Notes .
  • Motorola HT750 | Service Manual - Page 35
    3-29 3.8.15 HT1550•XLS Exploded View 1 2 5 6 7 8 3 4 14 13 15 16 17 18 19 20 21 24 26 28 29 32 10 9 11 12 22 23 25 27 30 31 35 37 39 40 33 34 36 38 41 42 43 44 Figure 3-19: HT1550•XLS Exploded View
  • Motorola HT750 | Service Manual - Page 36
    Retainer, Keypad Board Pad, Retainer Back Felt, Speaker Felt, Mic Boot, Mic Speaker Microphone Flex, Univ Conn Cap, 33pF Retainer, Speaker Boot, Backup Battery Table 3-8. HT1550•XLS Parts List (Continued) Item Motorola Part Number 30 6062884K01 31 0304726J04 32 3980667Z01 33 Typical 34
  • Motorola HT750 | Service Manual - Page 37
    may be substituted for the item listed. Table 3-11:Service Aids Motorola Part No. Description Application RLN4460 Portable Test Set Enables connection to audio/accessory jack. Allows switching for radio testing. HVN9025 Customer Programming Software (CPS Plus) CD ROM. Includes PPCPS
  • Motorola HT750 | Service Manual - Page 38
    DC Power Supply 0-20 Vdc, 0-5 Amps Frequency/deviation meter and signal generator for wide-range troubleshooting and alignment Two meters recommended for AC/ DC voltage and current measurements Used with service monitor for injection of PL tones Audio voltage measurements Waveform measurements
  • Motorola HT750 | Service Manual - Page 39
    Configuring and Wiring the Programming/Test Cable 3-37 3.11 Configuring and Wiring the Programming/Test Cable Block Figure 3-22: Programming/Test Cable AARKN4074 Figure 3-23: Pin Configuration of the Cable Side Connector
  • Motorola HT750 | Service Manual - Page 40
    and Wiring the Programming/Test Cable P1 TO RADIO UNIVERSAL CONNECTOR EXT SPKR + 1 EXT SPKR - 2 OPTION B+ 3 EXT MIC 4 OPT SEL 2 5 OPT SEL 1 6 GND 7 RX DATA 8 TX DATA 9 RSSI 10 XMIT/RX AUDIO 11 BOOT CTRL 12 N/C 13 P2 TO RADIO TEST SET RLN4460 1 2 AUDIO 5 AUDIO + 7 8 MIC AUDIO 9 15 16 GND 18 VOL
  • Motorola HT750 | Service Manual - Page 41
    procedure. To solve this problem, a special "test mode" is incorporated into the radio. Note 1: On VHF/UHF, LTR models, the radio must be in either conventional or LTR mode. Note 2: The test mode procedure that follows assumes that the Customer Programming Software Front Panel Access screen has
  • Motorola HT750 | Service Manual - Page 42
    the number of times listed in Table 4-1 to get the number of corresponding beeps. 4. Turn radio off to exit test mode. 5. To access all 14 test modes on a 4-channel radio, the frequency knob and mechanical stop sleeve must be removed (see paragraph 3-8 exploded view diagram). Button Test (For models
  • Motorola HT750 | Service Manual - Page 43
    >, view "130/1"; release, view "130/0". 16. Press Option Select1, view "135/1"; release, radio to return to the RF Test mode. Channel Selector Knob On/Off Knob Side Button 1 (programmable) Side Button 2 (programmable) Side Button 3 (programmable) Figure 4-1: Radio Side Button Location Channel
  • Motorola HT750 | Service Manual - Page 44
    carrier detected Multiple TX: selected DTMF tone pair Frequency 5 Open Unsquelch RX: constant unsquelch TX: mic audio 9 HSS MDC1200 RX: unsquelch if carrier detected TX: 1500Hz tone 11 CMP Compander RX: if carrier detected TX: mic audio 12 LLE Low-Level RX: if detected Expand
  • Motorola HT750 | Service Manual - Page 45
    OSW) BKC Speed THS detected TX: 1500Hz tone 8 11 BKC CMP RX: unsquelch if carrier detected TX: mic audio 9 12 LLE BKC RX: unsquelch if carrier detected TX: mic audio Table 4-3: Test Channel Spacing (Side Button 2) Number of Low Tones Channel Spacing 1 25/30 kHz 2 12.5 kHz 3 20
  • Motorola HT750 | Service Manual - Page 46
    number of beeps and tones listed in Table 4-1and Table 4-1. The non-display radio only sounds the beeps and tones. Note: On UHF LTR models, radios must be in conventional or LTR modes. Table 4-4: Test Frequencies (Using the Channel Selector Switch) Channel Selector Switch Test Channel Low
  • Motorola HT750 | Service Manual - Page 47
    models. Table 4-5: Receiver Performance Checks Test Name Service Monitor Radio Test Set Comments Reference Frequency Mode: PWR MON 4th channel test frequency* Monitor: Frequency error Input at RF In/Out Rated Audio Mode: GEN Output level: 1.0mV RF 4th channel test frequency* Mod: 1 kHz tone
  • Motorola HT750 | Service Manual - Page 48
    , Test Channel 4 DTMF out- put at antenna TEST MODE, Test Channel 4 TPL DPL PTT to continuous (during the performance check). PTT to continuous (during the performance check) As above As above Frequency error ±200 Hz VHF ±600 Hz UHF ±60 Hz Low Band Refer to Specifications Press PTT switch on radio
  • Motorola HT750 | Service Manual - Page 49
    An installation instruction manual is also included with each kit. NOTE: Refer to the appropriate program on-line help files for the programming procedures. Table 5-1: Software Installation Kits Radio Tuning Setup Description Kit Number Conventional, LTR, PrivacyPlus, PassPort CPS Subscription
  • Motorola HT750 | Service Manual - Page 50
    to the radio using a Motorola battery eliminator, P/N AA0180305G54. The initial test equipment (Figure 5-1) control settings are listed in Table 5-2. NOTE: Refer to appropriate program on-line help files for the tuning procedures. Table 5-2: Initial Equipment Control Settings Service Monitor
  • Motorola HT750 | Service Manual - Page 51
    Ribless Programming Cable is part number RKN4075 RIB RLN-4008 DB15 DB9 RIB Power Supply 120/230 Vac Computer Interface Cable 3080369B72 Tx Data Rx Data Gnd Figure 5-2: CPS Programming Setup 5.4 Cloning (Conventional and LTR) Cloning is the same for both the Conventional and LTR radio. Cloning
  • Motorola HT750 | Service Manual - Page 52
    , Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions source radio produces a "clone-exit" tone and displays "Clone Complete". 7. Turn both radios off. 8. Disconnect the cloning cable from both radios and turn them on for normal operation. On
  • Motorola HT750 | Service Manual - Page 53
    to read the "Target" radio's serial number. This number must be different from the "Source" codeplug, or the cloning progress will fail. 5. Connect "Target" radio to the computer, and press the PROGRAM button to program the "Source" codeplug into the "Target" radio. 6. The CPS will validate the code
  • Motorola HT750 | Service Manual - Page 54
    5-6 Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions 5.7 Lowband Molded Antenna Cut Chart This chart is for antenna NAB6064 used with professional radio series. NOTE: The chart below is not drawn to scale. Obtain and use a
  • Motorola HT750 | Service Manual - Page 55
    Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions 5-7 5.8 HT1250•LS+ PassPort Tone Options In order to provide more detailed information about the radio's state to a user or service technician various Tones and Display options
  • Motorola HT750 | Service Manual - Page 56
    5-8 Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions the "*" key for the decimal point, enter the desired Search Frequency in MHz. Press the Select key when the entry is complete or the Escape/Exit Key to exit the function
  • Motorola HT750 | Service Manual - Page 57
    generates two highpitched self-test pass tones, or a musical tone (selected in CPS). If the self-test is not successful, one low-pitched tone is heard. Radios with displays are able to display the error codes. The displayed error codes and related corrections are listed as follows: Table 6-1: Power
  • Motorola HT750 | Service Manual - Page 58
    to determine if its basic electronics and software are in working order. Problems detected during these tests are presented as error codes on the radio display. The presence of an error code should prompt the user that a problem exists and that a service technician should be contacted. Self-test
  • Motorola HT750 | Service Manual - Page 59
    restart. Restart radio. Use CPS and PPCPS to properly program radio and PTCB. Use PPCPS to program that Zone with a Primary Talk Group. 6.4 Operation Display Codes During radio operation, the radio performs dynamic tests to determine if the radio is working properly. Problems detected during these
  • Motorola HT750 | Service Manual - Page 60
    6-4 Power Up Self-Test Notes
  • Motorola HT750 | Service Manual - Page 61
    7-1 Chapter 7 Accessories 7.1 HT750/HT1250/HT1250•LS/HT1250•LS+/HT1550•XLS/MTX850/ MTX950/MTX850•LS/MTX8250/MTX9250/MTX8250•LS Accessories 7.1.1 Antennas VHF PMAD4012 PMAD4013 PMAD4014 PMAD4015 PMAD4023 136-174 MHz, Ferrule Connector 136-155 MHz, Stubby 155-174 MHz, Stubby 14 cm. Helical,
  • Motorola HT750 | Service Manual - Page 62
    •LS+ Limited Keypad Models Standard Leather Case, DTMF, Swivel Ultra-High and High Capacity Battery Carry Cases HLN9946 Standard Leather Case, Beltloop HLN9998 Standard Leather Case, Swivel HT750 (Standard Model Only) Lithium Ion Battery Carry Cases HLN9652 Standard Leather Case, Beltloop
  • Motorola HT750 | Service Manual - Page 63
    Vehicular Accessories AAEN1007B AAEN1006 7.1.6 Batteries HNN9008 HNN9009 HNN9010 HNN9011 HNN9012 HNN9013 7.1.7 Adapters AAHLN9716 7.1.8 Miscellaneous HLN9820 HLN9793 HLN9794 120V Rapid Rate Single Unit Charger Kit, U.S. 3-Prong Plug (includes Xfmr, pocket, spacer, model box, and NA/LA manual) Rapid
  • Motorola HT750 | Service Manual - Page 64
    AARMN4029 Accessories Customer Programming Software (CPS) - 3 Years Subscription (Conventional, PrivacyPlus, LTR, and PassPort) Cloning Cable, portable Professional Radio Only Programming/Test Cable (requires RIB box) Programming cable (includes internal Rib) Shop battery eliminator cable. Requires
  • Motorola HT750 | Service Manual - Page 65
    /MTX950 User Guide (French, and English) MTX8250/MTX9250 User Guide (French, and English) HT750/HT1250/HT1250•LS/HT1250•LS+/HT1550•XLS/ MTX850/MTX8250/MTX850•LS/MTX8250•LS Basic Service Manual English 7.1.14 Retrofit Front Cover Kits HLN9984 DTMF Retrofit Kit (HT750 only) - 16 Channel Model Only
  • Motorola HT750 | Service Manual - Page 66
    7-6 Accessories Notes
  • Motorola HT750 | Service Manual - Page 67
    Back Cover Kit HT1250 Back Cover Kit HT750 Front Housing Kit HT1250 Front Housing Kit (Full Keypad) HT750 Front Housing Kit (Keypad) HT1250 Front Housing Kit (Limited Keypad) Whip Antenna (403-520 MHz) HT750 User Guide HT1250 User Guide Note: Models ending in FD are Federal Government Radios Only.
  • Motorola HT750 | Service Manual - Page 68
    Kit HT1250 Back Cover Kit HT1250 Back Cover Kit HT1250 Back Cover Kit HT750 Front Housing Kit HT1250 Front Housing Kit (Full Keypad) HT1250 Front Housing Kit (Limited Keypad) Whip Antenna (403-520 MHz) HT750 User Guide HT1250 User Guide Note: Models ending in FD are Federal Government Radios Only.
  • Motorola HT750 | Service Manual - Page 69
    PassPort) Model Description AAH25RDH9DP7_N AAH25RDH9DP9_N HT1250•LS+, LTR/PassPort, LTD KPD, MDC/Conventional HT1250•LS+, LTR/PassPort, DTMF, MDC/ X X X X X X NAE6483 X X X X X X 6881088C42 Whip Antenna (403-520 MHz) HT1250•LS/HT1250•LS+ User Guide x = Indicates one of each is required.
  • Motorola HT750 | Service Manual - Page 70
    PassPort) Model Description AAH25SDH9DP7_N AAH25SDH9DP9_N HT1250•LS+, LTR/PassPort, LTD KPD, MDC/Conventional HT1250•LS+, LTR/PassPort, DTMF, MDC Keypad) X X X X X X NAE6483 X X X X X X 6881088C42 Whip Antenna (403-520 MHz) HT1250•LS/HT1250•LS+ User Guide x = Indicates one of each is required.
  • Motorola HT750 | Service Manual - Page 71
    /LTR) Model Description AAH25RDN9DU8_N HT1550•XLS, 403-470 MHz, 4 Watt, 160 Channel Item Description X PMLE4215 HT1550•XLS Back Cover Kit (403-470 MHz) X PMLN4218 HT1550•XLS Front Housing Kit X NAE6483 Whip Antenna (403-520 MHz) X 6881093C95 HT1550•XLS User Guide x = Indicates
  • Motorola HT750 | Service Manual - Page 72
    /LTR) Model Description AAH25SDN9DU8_N HT1550•XLS, 450-512 MHz, 4 Watt, 160 Channel Item Description X PMLE4216 HT1550•XLS Back Cover Kit (450-512 MHz) X PMLN4218 HT1550•XLS Front Housing Kit X NAE6483 Whip Antenna (403-520 MHz) X 6881093C95 HT1550•XLS User Guide x = Indicates
  • Motorola HT750 | Service Manual - Page 73
    Cover Kit HT1250 Front Housing Kit (Full Keypad) HT1250 Front Housing Kit (Limited Keypad) Antenna, 136-155 MHz Stubby Antenna, 155-174 MHz Stubby Antenna, 136-155 MHz 14 cm Antenna, 155-174 MHz 14 cm HT750 User Guide HT1250 User Guide Note: Models ending in FD are Federal Government Radios Only
  • Motorola HT750 | Service Manual - Page 74
    Stubby Antenna, 155-174 MHz Stubby Antenna, 136-155 MHz 14 cm (Red coded) Antenna, 155-174 MHz 14 cm Helical (Black coded) Antenna, 14 cm. Helical, Standard Length - 150-161 MHz HT1550•XLS Back Cover Kit (136-174 MHz) HT1550•XLS Front Housing Kit HT1250•LS/HT1250•LS+ User Guide HT1550•XLS User Guide
  • Motorola HT750 | Service Manual - Page 75
    LTR & PassPort) Model AAH25KDF9DP5_N AAH25KDF9DP7_N AAH25KDH9DP6_N Antenna, 151-159 MHz Stubby X X X X HAD9743 Antenna, 162-174 MHz Stubby X X X X 8504762J01 Antenna, 136-155 MHz Whip X X X X 8504762J02 Antenna, 155-174 MHz Whip X X X X 6881088C42 HT1250.LS/HT1250.LS+ User Guide
  • Motorola HT750 | Service Manual - Page 76
    6 W HT750 Front Housing Kit HT1250 Front Housing Kit (Limited Keypad) Antenna, 29.7-42/35-50 MHz Stubby Antenna, 29.7-42/35-50 MHz Stubby Antenna, 29.7-42/35-50 MHz 14 cm Antenna, 29.7-42/35-50 MHz 14 cm HT750 User Guide HT1250 User Guide Note: Models ending in FD are Federal Government Radios Only
  • Motorola HT750 | Service Manual - Page 77
    X NAF5042 Antenna, Quarter Wave, Stubby, 806-870 MHz X 6881093C80 MTX850•LS User Guide X X 6881093C81 MTX8250•LS User Guide x = Indicates one of each is required. 8.12 800 MHz (Privacy Plus) MTX Series, 806-866 MHz (Privacy Plus) Model Description AAH25UCC6GB3_N MTX850, 2.5W, 16-Ch (Non
  • Motorola HT750 | Service Manual - Page 78
    Plus) MTX Series, 896-941 MHz (Privacy Plus) Model Description AAH25WCC4GB3_N AAH25WCH4GB6_N MTX950, 2.5W, 16-Ch (Non-Display) MTX9250, 2.5W, 160-Ch Kit (Full Keypad) Antenna, 800 MHz, 1/2 Wave, Whip, 806-941 MHz Antenna, Quarter Wave, Stubby, 806-941 MHz MTX950 User Guide MTX9250 User Guide
  • Motorola HT750 | Service Manual - Page 79
    14 Specifications, HT750 Radio Specification Model Numbers: Frequency Range: Frequency Stability: (-30°C to +60°C, 25°C Ref.) Channel Capacity: Channel Spacing: Power Supply: Dimensions: H x W x D With NiMH High Capacity Battery: With NiMH Ultra-High Capacity Battery: With NiCd Battery: With LiIon
  • Motorola HT750 | Service Manual - Page 80
    per EIA: Adjacent Channel Selectivity ETS: Spurious Rejection: Rated Audio: Audio Distortion @ Rated Audio: Hum and Noise (with LLE Audio Response (0.3 - 3 kHz): +1 to -3 dB Conducted Spurious Emission per FCC Part 15: -57 dBm 1 Ghz Specifications subject to change without
  • Motorola HT750 | Service Manual - Page 81
    , HT1250 Radio Specification Model Numbers: Frequency Range: Frequency Stability: (-30°C to +60°C, 25°C Ref.) Channel Capacity: Channel Spacing: Power Supply: Dimensions: H x W x D With NiMH High Capacity Battery: With NiMH Ultra-High Capacity Battery: With NiCd Battery: With LiIon Battery: Weight
  • Motorola HT750 | Service Manual - Page 82
    8-16 Model Chart and Test Specifications Specification Power Output NiMH @ 7.5V: Spurs/Harmonics: Audio Response: (from 6 dB/oct. Pre-Emphasis, 300 to 3000Hz) Audio Distortion: @ 1000 Hz, 60% Rated Max. Dev. Modulation Limiting: Conducted/Radiated Emissions: FM Hum and Noise: Transmitter Lowband
  • Motorola HT750 | Service Manual - Page 83
    16 Specifications, HT1250•LS+ Radio General Specification UHF VHF Model Numbers: Frequency Range: Frequency Stability: (-30°C to +60°C, 25°C Ref.) Channel Capacity: Channel Spacing: Power Supply: Dimensions: H x W x D With NiMH High Capacity Battery ounces (350 grams) Low Power 11 hours 14
  • Motorola HT750 | Service Manual - Page 84
    Modulation Limiting: FM Hum and Noise: Model Chart and Test Specifications UHF / Channel Selectivity Part 15: -57 dBm 1 Ghz Specifications subject to change without notice. All electrical specifications and methods refer to EIA/TIA 603 standards. Professional Series radios
  • Motorola HT750 | Service Manual - Page 85
    17 Specifications, HT1550•XLS Radio Specification Model Numbers: Frequency Range: Channel Capacity: Channel Spacing: Power Supply: Dimensions: H x W x D With Standard High Capacity NiMH Battery: With Ultra High Capacity NiMH Battery: With NiCD Battery: With Lilon Battery: Weight: With Standard High
  • Motorola HT750 | Service Manual - Page 86
    8-20 Model Chart and Test Specifications Specification Frequency Stability: (-25°C to +55°C, +25° Ref.) Power: Modulation Limiting: FM Hum & Noise: Conducted/Radiated Emission: Adjacent Channel Power: Audio Response: (300 - 3000 Hz) Audio Distortion: Transmitter VHF/UHF ±2.5 ppm VHF: 1-5W UHF:
  • Motorola HT750 | Service Manual - Page 87
    (900 MHz) Radios Specification Model Numbers: MTX850 MTX8250 MTX950 MTX9250 Frequency: Channel Capacity: MTX850/MTX950: MTX8250/MTX9250: Power Supply: Dimensions: H x W x D With NiMH High Capacity Battery: With NiMH Ultra-High Capacity Battery: With NiCd Battery: With LiIon Battery: Weight: With
  • Motorola HT750 | Service Manual - Page 88
    8-22 Model Chart and Test Specifications Specification Frequency Range: Transmit Talkaround Power Output: Channel Spacing: Freq. Stability (-30°C to +60°C, 25° Ref.) Emission (Conducted & Radiated): FM Modulation: Audio Response: (from 6 dB/oct. Pre-Emphasis, 300 to 3000Hz) Audio Distortion:
  • Motorola HT750 | Service Manual - Page 89
    Model Chart and Test Specifications 8-23 8.19 Specifications, MTX850•LS and MTX8250•LS (800 MHz) Radios Specification Frequency: Channel Capacity: MTX850•LS: AAH25UCC6DU3_N MTX8250•LS: AAH25UCH6DU6_N MTX8250•LS: AAH25UCH6DU9_N Power Supply: Dimensions: With NiMH High Capacity Battery: With NiMH
  • Motorola HT750 | Service Manual - Page 90
    8-24 Model Chart and Test Specifications Specification Frequency Range: Transmit: Talkaround: Power Output: Channel Spacing: Freq. Stability: (-30°C to +60°C) Spurs/Harmonics: Adjacent Channel Power: Audio Response: (from 6 dB/oct. Pre-Emphasis, 300 to 3000Hz) Audio Distortion: @ 1000 Hz, 60%
  • Motorola HT750 | Service Manual - Page 91
    of volume expansion; used to improve the signal to noise ratio. Low-Speed Handshake: 150 baud digital data sent to the radio during trunked operation while receiving audio. Trunked signaling protocol using low speed data. Registered trademark of E.F. Johnson Company. Motorola Digital Communication.
  • Motorola HT750 | Service Manual - Page 92
    PPM PTT RAM Registers Repeater RESET RF PA RIB ROM RSSI RPT/TA Softpot Software SPI (clock and data lines) Squelch Motorola Radio-Telephone Software Potentiometer: a computer-adjustable electronic attenuator. Computer programs, procedures, rules, documentation, and data pertaining to the operation
  • Motorola HT750 | Service Manual - Page 93
    VCOBIC VHF VSWR Glossary-3 An operating mode whereby the radio is muted but still continues operating system with the system-select switch (also, the name given to this switch). Time-Out Timer: a timer that limits the length of a transmission. Tone Private-line. Microcontroller. Ultra High Frequency
  • Motorola HT750 | Service Manual - Page 94
    Glossary-4 Notes
  • Motorola HT750 | Service Manual - Page 95
  • Motorola HT750 | Service Manual - Page 96
    MOTOROLA, the Stylized M Logo are registered in the U.S. Patent and Trademark Office. All other product or service names are the property of their respective owners. © Motorola, Inc. 2005 *6880906Z54* 6880906Z54-D
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HT750
MTX850
MTX8250
HT1250
MTX850•LS
MTX8250•LS
HT1250•LS
HT1250•LS+
MTX950
HT1550•XLS
MTX9250
Portable Radios
Professional Radio
Basic Service Manual
Motorola, Inc.
8000 West Sunrise Boulevard
Fort Lauderdale, Florida 33322
68P80906Z54-D