Motorola HT750 Service Manual

HT750 MTX850 MTX8250HT1250 MTX850•LS MTX8250•LSHT1250•LS HT1250•LS+ MTX950HT1550•XLS MTX9250Portable RadiosProfessional RadioBasic Service ManualMotor

xNotes

xiLIST OF TABLESTable 1-1: Radio Model Number (Example: AAH25KDC9AA3AN)... 1-4Table 3-11: Service Aids...

xiiNotes

1-1Chapter 1Introduction1.1 Scope of ManualThis manual is intended for use by service technicians familiar with similar types of equipment. It contain

1-2 Introduction1.2.3 Piece Parts AvailabilitySome replacement parts, spare parts, and/or product information can be ordered directly.Motorola Online:

Introduction 1-3Fax OrdersCustomer Care and Services Division*1-800-622-6210847-576-3023 (International)USFGMD(Federal Government Orders)1-800-526-864

1-4 Introduction1.3 Radio Model InformationThe model number and serial number are located on a label attached to the back of your radio. You can deter

2-1Chapter 2Intrinsically Safe Radio Information2.1 FMRC Approved EquipmentAnyone intending to use a radio in a location where hazardous concentration

2-2 Intrinsically Safe Radio InformationModifications can only be made by the original product manufacturer (Motorola) at one of its FM audited manufa

Intrinsically Safe Radio Information 2-32.2.3 Do Not Substitute Options or AccessoriesThe Motorola communications equipment certified by Factory Mutua

iiForewordThis manual provides sufficient information to enable qualified service technicians to troubleshoot and repair CDM Series mobile radios to t

2-4 Intrinsically Safe Radio InformationNotes

3-1Chapter 3Maintenance3.1 IntroductionThis chapter provides details about the following:l Preventive maintenance (inspection and cleaning) l Safe han

3-2 Maintenancedislodged material out and away from the inside of the radio. Make sure that controls or tunable components are not soaked with alcohol

Maintenance 3-3Rigid Circuit BoardsThis family of radios uses bonded, multi-layer, printed circuit boards. Since the inner layers are not accessible,

3-4 Maintenance3.6 Detailed Radio Disassembly3.6.1 Front Cover from Chassis Disassembly1. Turn off the radio.2. Remove the battery:a. Pull down on the

Maintenance 3-54. Separate the chassis from the internal electronics front cover assembly as follows:a. Insert a small, 3/16” flat-blade screwdriver,

3-6 Maintenance3.6.2 Chassis Assembly/Disassembly1. If disassembly of the chassis or the main board is required, then use a TORX™ screwdriver with a T

Maintenance 3-73. To remove the keypad retainer shield:a. Insert the tip of a “penknife size,” flat blade screwdriver in the opening at the end of the

3-8 MaintenanceFigure 3-5: Removing the Keypad Retainer and Other Boards from the Radio3.6.4 Speaker, Microphone, and Universal Connector Flex Disass

Maintenance 3-96. After the universal connector tail of the speaker-microphone assembly is removed, the assembly can be completely removed. If it is n

iiiTable of ContentsForeword...iiProduct Safety

3-10 Maintenance3.7 Detailed Radio Reassembly3.7.1 Control Top Reassembly1. Replace transmit light pipe and control top seal. 2. Peel off the liners f

Maintenance 3-11Figure 3-8: Lock Retainer Catches to the Radio’s Body3.7.5 Chassis Assembly Reassembly1. Slide on the ground contact (if it was remove

3-12 Maintenance8. Reassemble the knobs, dust cover, antenna, and battery.Figure 3-9: Fastening the Chassis 3.7.7 DTMF Retrofit Kit Procedure (Optiona

Maintenance 3-133.7.8 Option Board Installation1. With the keypad retainer removed the keypad backer board can be removed without the use of tools.2.

3-14 MaintenanceNotes.

3-293.8.15 HT1550•XLS Exploded ViewFigure 3-19: HT1550•XLS Exploded View123456789101112131415161718192021222324252627282930313233343536373840414243443

3-303.8.16 HT1550•XLS Exploded View Parts ListTable 3-8. HT1550•XLS Parts ListItemMotorola Part NumberDescription1 See Section 7 in manualAntenna2 32

Service Aids 3-353.9 Service AidsTable 3-11 lists service aids recommended for working on the HT750/HT1250/HT1250•LS/HT1250•LS+/HT1550•XLS/MTX850/MTX9

3-36 Test Equipment3.10 Test EquipmentTable 3-12 lists test equipment required to service the HT750/HT1250/HT1250•LS/HT1250•LS+/HT1550•XLS/MTX850/MTX9

Configuring and Wiring the Programming/Test Cable 3-373.11 Configuring and Wiring the Programming/Test CableFigure 3-22: Programming/Test Cable AARKN4

iv3.2.2 Cleaning Procedures... 3-13.3 Safe Handling of CMOS and LDMOS Dev

3-38 Configuring and Wiring the Programming/Test CableFigure 3-24: Programming/Test Cable Schematic1257891618192021222515AUDIO -AUDIO +MIC AUDIOGNDVO

4-1Chapter 4Transceiver Performance Testing4.1 GeneralThese radios meet published specifications through their manufacturing process by utilizing high

4-2 Transceiver Performance TestingTo enter the test mode for a non-display radio:Button Test (For models with ”G” in location 10 of model number Exam

Transceiver Performance Testing 4-314. Press HOME, view “129/1”; release, view “129/0”.15. Press >, view “130/1”; release, view “130/0”.16. Press O

4-4 Transceiver Performance TestingFigure 4-3: Two-Line DisplayFigure 4-4: Four-Line Display (HT1550•XLS)Table 4-1: Test Environments (Side Button 1

Transceiver Performance Testing 4-5Table 4-2: Test Environments (Models with “G” in location 10 of model number EX: AAH25RCH6GB6AN)Table 4-3: Test Cha

4-6 Transceiver Performance Testing4.3 Test Frequencies for Display and Non-Display RadiosThe radio channels and test frequencies are listed in Table

Transceiver Performance Testing 4-74.4 Receiver Performance TestsThe receiver and transmitter performance tests are contained in Table 4-5 and Table 4

4-8 Transceiver Performance Testing*** MDC* See Table 4-4Table 4-6: Transmitter Performance Checks (Models with ”G” in location 10 of model number

5-1Chapter 5Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions5.1 IntroductionThis

v3.8.16 HT1550•XLS Exploded View Parts List ... 3-303.8.17 MTX950 Exploded View...

5-2 Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions5.2 Global Radio Tuning Setu

Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions 5-35.3 CPS Programming SetupThe

5-4 Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functionssource radio produces a “clo

Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions 5-5Procedure:1. Use the READ RA

5-6 Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions5.7 Lowband Molded Antenna C

Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functions 5-75.8 HT1250•LS+ PassPort Tone

5-8 Radio Tuning, Programming, Cloning, Lowband Antenna Cutting Procedure, PassPort Tone Options, and Diagnostic Functionsthe “*” key for the decimal

6-1Chapter 6Power Up Self-Test6.1 Error Codes - Conventional and LTR RadiosTurning on the radio starts a self-test routine that checks the RAM, ROM ch

6-2 Power Up Self-Test6.2 Error Codes - Privacy PlusAt power-up, the radio performs cursory tests to determine if its basic electronics and software a

Power Up Self-Test 6-36.3 Error Codes - PassPortFor the purpose of this document the phrase “PassPort Trunking Controller Board” and its acronym “PTCB

vi6.3 Error Codes - PassPort... 6-36.4 Operation Display Codes ...

6-4 Power Up Self-TestNotes

7-1Chapter 7Accessories7.1 HT750/HT1250/HT1250•LS/HT1250•LS+/HT1550•XLS/MTX850/MTX950/MTX850•LS/MTX8250/MTX9250/MTX8250•LS Accessories7.1.1 AntennasVH

7-2 Accessories7.1.2 Carrying AccessoriesAll Models/All Battery Chemistries:7.1.3 Carry CasesHLN9952 Carry Holder, Belt Clip-One size fits allHLN9714

Accessories 7-37.1.4 Chargers 7.1.5 Vehicular Accessories7.1.6 Batteries 7.1.7 Adapters7.1.8 MiscellaneousAAHTN3000 120V Rapid Rate Single Unit Charge

7-4 Accessories7.1.9 Service Aids7.1.10 Audio Accessories H5177 Customer Programming Software (CPS) - 3 Years Subscription (Conventional, PrivacyPlus,

Accessories 7-57.1.11 Option Boards* (All option boards below are not compatible with HT1550•XLS)*All option boards include the installation user manu

7-6 AccessoriesNotes

8-1Chapter 8Model Chart and Test Specifications8.1 UHF 403–470 MHz (Conventional)Note: Models ending in FD are Federal Government Radios Only.HT Serie

8-2 Model Chart and Test Specifications8.2 UHF 450–512 MHz (Conventional)Note: Models ending in FD are Federal Government Radios Only.HT Series, UHF,

Model Chart and Test Specifications 8-38.3 UHF 403–470 MHz (LTR and PassPort)HT Series, UHF, 403–470 MHz (LTR & PassPort)Model DescriptionAAH25RDH

vii8.12 800 MHz (Privacy Plus) ... 8-118.13 900 MHz (Privacy Plus) ..

8-4 Model Chart and Test Specifications8.4 UHF 450–512 MHz (LTR and PassPort)HT Series, UHF, 450–512 MHz (LTR & PassPort)Model DescriptionAAH25SDH

Model Chart and Test Specifications 8-58.5 UHF 403–470 MHz (Conventional/LTR)HT Series, UHF, 403–470 MHz (Conventional/LTR)Model DescriptionAAH25RDN9D

8-6 Model Chart and Test Specifications8.6 UHF 450–512 MHz (Conventional/LTR)HT Series, UHF, 450–512 MHz (Conventional/LTR)Model DescriptionAAH25SDN9D

Model Chart and Test Specifications 8-78.7 VHF 136–174 MHzNote: Models ending in FD are Federal Government Radios OnlyHT Series, VHF, 136–174 MHzModel

8-8 Model Chart and Test Specifications8.8 VHF 136–174 MHz (Conventional/LTR)HT Series, VHF, 136–174 MHz (Conventional/LTR)Model DescriptionAAH25KDF9D

Model Chart and Test Specifications 8-98.9 VHF, 136–174 MHz (LTR & PassPort)HT Series, VHF, 136–174 MHz (LTR & PassPort)Model DescriptionAAH25

8-10 Model Chart and Test Specifications8.10 LowBand 29.7–42/35–50 MHzNote: Models ending in FD are Federal Government Radios OnlyHT Series, Lowband,

Model Chart and Test Specifications 8-118.11 800 MHz (LTR)8.12 800 MHz (Privacy Plus) MTX Series, 806–866 MHz (LTR)Model DescriptionAAH25UCH6DU9_N MTX

8-12 Model Chart and Test Specifications8.13 900 MHz (Privacy Plus) MTX Series, 896–941 MHz (Privacy Plus)Model DescriptionAAH25WCC4GB3_N MTX950, 2.5

Model Chart and Test Specifications 8-138.14 Specifications, HT750 RadioGeneralSpecification Lowband VHF UHFModel Numbers: AAH25BECAAH25CECAAH25KDCAAH

viii

8-14 Model Chart and Test SpecificationsTransmitterSpecification Lowband VHF UHFPower Output NiMH @ 7.5V: 1-6 W 1-5 W 1-4 WSpurs/Harmonics: -36 dBm &l

Model Chart and Test Specifications 8-158.15 Specifications, HT1250 RadioGeneralSpecification Lowband VHF UHFModel Numbers: AAH25BEFAAH25CEFAAH25KDFAA

8-16 Model Chart and Test SpecificationsTransmitterSpecification Lowband VHF UHFPower Output NiMH @ 7.5V: 1-6 W 1-5 W 1-4 WSpurs/Harmonics: -36 dBm &l

Model Chart and Test Specifications 8-178.16 Specifications, HT1250•LS+ RadioGeneralSpecification UHF VHFModel Numbers: AAH25SDHAAH25RDHAAH25KDFAAH25K

8-18 Model Chart and Test SpecificationsTransmitterSpecification UHF / VHFPower Output NiMH @ 7.5V: 1-4 W / 1-5WSpurs/Harmonics: -36 dBm < 1GHz -30

Model Chart and Test Specifications 8-198.17 Specifications, HT1550•XLS RadioGeneral Specification VHF/UHFModel Numbers: AAH25KDN9DU8 (VHF)AAH25RDN9DU

8-20 Model Chart and Test SpecificationsTransmitterSpecification VHF/UHFFrequency Stability:(-25°C to +55°C, +25° Ref.)±2.5 ppmPower: VHF: 1-5WUHF: 1-

Model Chart and Test Specifications 8-218.18 Specifications, MTX850/MTX8250 (800 MHz),MTX950/MTX9250 (900 MHz) RadiosGeneralSpecification800 MHz 900 M

8-22 Model Chart and Test Specifications*with Hear Clear*with Hear ClearTransmitterSpecification800 MHz 900 MHzFrequency Range:TransmitTalkaround806-8

Model Chart and Test Specifications 8-238.19 Specifications, MTX850•LS and MTX8250•LS (800 MHz) RadiosGeneralSpecification 800 MHzFrequency: 806-821,

ixLIST OF FIGURESFigure 3-1: Battery Removal ... 3-4Figure 3-2: Knob

8-24 Model Chart and Test SpecificationsTransmitterSpecification 800 MHzFrequency Range:Transmit:Talkaround:806-821 MHz851-866 MHzPower Output: 2.5W @

Glossary-1GlossaryTerm DefinitionALC Automatic Level Control: a circuit in the transmit RF path that controls RF power amplifier output, provides leve

Glossary-2MRTI Motorola Radio-Telephone Interconnect: a system that provides a repeater connection to the Public Switched Telephone Network (PSTN). Th

Glossary-3Standby Mode An operating mode whereby the radio is muted but still continues to receive data.System Central ControllerMain control unit of

Glossary-4Notes

6880906Z54-D*6880906Z54*MOTOROLA, the Stylized M Logo are registered in theU.S. Patent and Trademark Office. All other product orservice names are the