™ Digital XTS 3000™ and XTS 3000 R™ Portable Radios Detailed Service Manual
Foreword The information contained in this manual relates to all ASTRO Digital XTS 3000™ portable radios, unless otherwise specified. This manual provides sufficient information to enable service shop personnel to troubleshoot and repair an ASTRO Digital XTS 3000 portable radio to the component level. Safety Information Before operating an ASTRO Digital XTS 3000 radio, please read the “Safety” section in the front of this manual.
Table of Contents Foreword . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . inside front cover List of Figures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv List of Tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iv List of Schematics and Boards . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Receiver Front End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Receiver Back End . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Harmonic Filter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-5 Specialized Test Equipment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-5 Vacuum Pump Kit, NLN9839 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8-5 Pressure Pump Kit, NTN4265 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
List of Figures Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Figure 13 Figure 14 Figure 15 Figure 16 Controller Board/Vocoder Board Interconnection. . . . . . . . . . . . . . . . . . . . . . . . . . 2-4 B+ Routing for VHF/UHF Transceiver Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2 B+ Routing for 800MHz Transceiver Boards. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
NLE4250B, NLE4250E UHF Range 2 RF Board Schematic Diagram, Sheet 1 of 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-24 NLE4250B, NLE4250E UHF Range 2 RF Board Schematic Diagram, Sheet 2 of 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13-25 NLE4250B, NLE4250E UHF Range 2 RF Board Schematic Diagram, Sheet 3 of 3 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Safety SAFETY AND GENERAL INFORMATION IMPORTANT INFORMATION ON SAFE AND EFFICIENT OPERATION READ THIS INFORMATION BEFORE USING YOUR MOTOROLA TWO-WAY RADIO The information provided in this document supersedes the general safety information contained in user guides published prior to October 2000.
Body-worn Operation To maintain compliance with FCC RF exposure guidelines, if you wear a radio on your body when transmitting, always place the radio in a Motorola approved clip, holder, holster, case, or body harness for this product. Use of non-Motorola-approved accessories may exceed FCC RF exposure guidelines.
• use the ear opposite the pacemaker to minimize the potential for interference. • turn the radio OFF immediately if you have any reason to suspect that interference is taking place. • Hearing Aids Some digital wireless radios may interfere with some hearing aids. In the event of such interference, you may want to consult your hearing aid manufacturer to discuss alternatives.
OPERATIONAL CAUTIONS ANTENNAS Do not use any portable radio that has a damaged antenna. If a damaged antenna comes into contact with your skin, a minor burn can result. ! Caution BATTERIES All batteries can cause property damage and/or bodily injury such as burns if a conductive material such as jewelry, keys, or beaded chains touch exposed terminals. The conductive material may complete an electrical circuit (short circuit) and become quite hot.
WARNINGS ! WARNING • 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 an 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 a radio off before removing or installing a battery or accessory.
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.
Notes: xii
Portable Radio Model Numbering System Typical Model Number: H Position: 1 0 2 9 4 3 U 4 C 5 9 7 P 8 W 9 7 10 A 11 N 12 S 13 P 14 0 15 1 16 Positions 13 - 16 “SP” Model Suffix Position 1 - Type of Unit H = Hand-Held Portable Position 12 Unique Model Variations C = Cenelec N = Standard Package Positions 2 & 3 - Model Series 09 = XTS 04 3000 = ASTRO Position 4 - Frequency Band A = Less than 29.7MHz P = B = 29.7 to 35.99MHz Q= C = 36 to 41.
ASTRO Digital XTS 3000 Model Chart (“A” Models) MODEL NUMBER H09KDC9PW5AN H09KDF9PW7AN H09KDH9PW7AN H09RDC9PW5AN H09RDF9PW7AN H09RDH9PW7AN H09SDC9PW5AN H09SDF9PW7AN H09SDH9PW7AN H09UCC9PW5AN H09UCF9PW7AN H09UCH9PW7AN ITEM NUMBER X X X X X X X X X X X X NCN6128_ X X X NLD8898_ X X X NLE4249_ X X X NLE4250_ X X X X X X X X X X X X NTN8250_ X X X X X X X X X X X X NTN8266_ X X X X X X X X X X X X NTN8294_ X X X X NTN8311_ X X X X NTN8493_ X X X X NTN8272_ X X X X NTN8495_ X X X X NTN8273_ X X X NUF6472_ X X X
ASTRO Digital XTS 3000 Model Chart (”B” Models) MODEL NUMBER H09KDC9PW5BN H09KDF9PW7BN H09KDH9PW7BN H09RDC9PW5BN H09RDF9PW7BN H09RDH9PW7BN H09SDC9PW5BN H09SDF9PW7BN H09SDH9PW7BN H09UCC9PW5BN H09UCF9PW7BN H09UCH9PW7BN ITEM NUMBER X X X X X X X X X X X X NCN6167_ X X X NLD8898_ X X X NLE4249_ X X X NLE4250_ X X X X X X X X X X X X NTN8250_ X X X X X X X X X X X X NTN8266_ X X X X X X X X X X X X NTN8294_ X X X X NTN8311_ X X X X NTN8493_ X X X X NTN8751_ X X X X NTN8752_ X X X X NTN8753_ X X X NUF6472_ X X X
ASTRO Digital XTS 3000 R (Ruggedized) Model Chart MODEL NUMBER H09KDC9PW5BN H09KDF9PW7BN H09KDH9PW7BN H09RDC9PW5BN H09RDF9PW7BN H09RDH9PW7BN H09SDC9PW5BN H09SDF9PW7BN H09SDH9PW7BN H09UCC9PW5BN H09UCF9PW7BN H09UCH9PW7BN ITEM NUMBER X X X X X X X X X X X X NCN6167_ X X X NLD8898_ X X X NLE4249_ X X X NLE4250_ X X X X X X X X X X X X NTN8250_ X X X X X X X X X X X X NTN8266_ X X X X X X X X X X X X NTN8297_ X X X X NTN8311_ X X X X NTN8493_ X X X X NTN8650_ X X X X NTN8651_ X X X X NTN8652_ X X X NUF6472_ X X
ASTRO Digital XTS 3000 R (Ruggedized) Yellow Model Chart MODEL NUMBER H09KDC9PW5BN H09KDF9PW7BN H09KDH9PW7BN H09RDC9PW5BN H09RDF9PW7BN H09RDH9PW7BN H09SDC9PW5BN H09SDF9PW7BN H09SDH9PW7AN H09UCC9PW5BN H09UCF9PW7BN H09UCH9PW7BN ITEM NUMBER X X X X X X X X X X X X NCN6167_ X X X NLD8898_ X X X NLE4249_ X X X NLE4250_ X X X X X X X X X X X X NTN8250_ X X X X X X X X X X X X NTN8266_ X X X X X X X X X X X X NTN8294_ X X X X NTN8311_ X X X X NTN8493_ X X X X NTN8669_ X X X X NTN8670_ X X X X NTN8671_ X X X NUF647
Model History Tables The following tables include all of the ASTRO XTS 3000 Digital Portable Radio models from the beginning of this product line to date. Each table includes model number, model number description, and the part numbers of the front cover kit, transceiver board (Xcvr Bd), controller board, and vocoder board that shipped with that particular model.
Standard Models Model Number H09UCC9PW5AN Description Front Cover Kit 800MHz 3 Watt Model I NTN8272C Xcvr Board NUF6472B Controller Board NTN8250C NCN6128B NUF6472B H09UCC9PW5BN 800MHz 3 Watt Model I NTN8751A H09UCF9PW7AN 800MHz 3 Watt Model II NTN8495A H09UCF9PW7BN 800MHz 3 Watt Model II NTN8752A H09UCH9PW7AN 800MHz 3 Watt Model III NTN8273B NUF6472B NUF6472B NCN6167A NUF6472B NCN6167A 800MHz 3 Watt Model III NTN8753A NUF6472B NTN8250D NTN8250D NTN8250D NTN8250C NCN6128B NUF6
Ruggedized Models Model Number Description Front Cover Transceiver Controller Kit Board Board Vocoder Board H09KDC9PW5BN VHF 1-5 Watt Model I NTN8650A NLD8898E NCN6167A NTN8250D H09KDF9PW7BN VHF 1-5 Watt Model II NTN8651A NLD8898E NCN6167A NTN8250D H09KDH9PW7BN VHF 1-5 Watt Model III NTN8652A NLD8898E NCN6167A NTN8250D H09RDC9PW5BN UHF Range 1 1-4 Watt Model I NTN8650A NLE4249B NCN6167A NTN8250D H09RDF9PW7BN UHF Range 1 1-4 Watt Model II NTN8651A NLE4249B NCN6167A NTN8250D
Glossary A/D Analog to Digital converter; converts an instantaneous dc voltage level to a corresponding digital value. ABACUS IC Custom integrated circuit providing a digital receiver IF backend. ADSIC ABACUS/DSP Support IC; custom integrated circuit providing peripheral functions for the DSP. ALC Automatic Level Control; a circuit in the transmit RF path that controls RF power amplifier output, provides leveling over frequency and voltage, and protects against high VSWR.
Host Port Parallel memory mapped interface consisting of eight registers in the DSP56001. IC Integrated Circuit IMBE A sub-band, voice encoding algorithm used in ASTRO digital voice. ISW Inbound Signalling Word; data transmitted on the control channel from a subscriber unit to the central control unit. LSH Low Speed Handshake; 150 baud digital data sent to the radio during trunked operation while receiving audio.
SCI IN Serial Communication Interface INput line SLIC Support-Logic IC; a custom gate array used to provide I/O and memory expansion for the microcontroller. Smart RIB Smart Radio Interface Box; a service aid that enables communications between the radio and the computer’s serial communications adapter. Used in conjunction with the RSS to read the DSP Code, FLASHcode, Host Code, and model number. Softpot Software potentiometer; a computer-adjustable electronic attenuator.
Notes xxiv
Introduction General 1 This manual includes all the information needed to maintain peak product performance and maximum working-time. This detailed level of service (component level) is typical of some service centers, selfmaintained customers, and distributors. This manual is to be used in conjunction with the ASTRO Digital XTS 3000 Portable Radios Basic Service Manual (Motorola part number 68P81083C85), which uses the pass/fail service approach to radio problems.
Notations Used in This Manual Throughout the text in this publication, you will notice the use of warnings, cautions, and notes. These notations are used to emphasize that safety hazards exist, and care must be taken and observed. NOTE: ! Caution ! WARNING ! DANGER An operational procedure, practice, or condition, etc., which is essential to emphasize. CAUTION indicates a potentially hazardous situation which, if not avoided, may result in equipment damage.
General Overview of an ASTRO Digital XTS 3000 Radio 2 The ASTRO Digital XTS 3000 radio is a dual-mode (trunked/ conventional), microcontroller-based transceiver incorporating a Digital Signal Processor (DSP). The microcontroller handles the general radio control, monitors status, and processes commands input from the keypad or other user controls. The DSP processes the typical analog signals and generates the standard signaling digitally to provide compatibility with existing analog systems.
The display module is a four-line x 12-character, liquid-crystal display (LCD) with associated circuitry. This module utilizes chip-on-board technology and is not considered field repairable. The keypad module is either a 6 x 3- or a 2 x 3-button module with backlighting. The encryption board (secure models only) connects directly to the controller board and interfaces directly with the vocoder digital circuitry.
Transceiver Board Overview The receiver front end consists of a preselector, an RF amplifier, a second preselector, and a mixer. In the VHF and UHF radios, both preselectors are varactor-tuned, two-pole filters controlled by the microcontrol unit (MCU) through the digital/analog (D/A) IC. On the 800MHz receiver front end, these filters are fixed-tuned. The RF amplifier is a dual-gate, gallium- arsenide based IC. The mixer is a double-balanced, active mixer coupled by transformers.
Vocoder Board DSP SRAM DSP56001A DSP SRAM DSP SRAM ADSIC 256K x 8 FLASH 50-pin Connection to Vocoder Board 20-pin Connection to RF Board 7-pin Connection to Display Module Controller Board Switching Regulator Circuit 25-pin Connection to Encryption Board 32K x 8 EEPROM HC11F1 µP 12-pin Connection to Keypad Module 32K x 8 SRAM Audio Circuit SLIC 1M x 8 FLASH 41-pin Connection to Controls/Universal Connector MAEPF-25993-O Figure 1 Controller Board/Vocoder Board Interconnection The SLIC acts as
Vocoder Board Overview The vocoder board (see Figure 1) contains the radio’s DSP and ADSIC circuitry. It is responsible for all voice and data processing and signalling. The DSP performs all signalling and voice encoding and decoding as well as audio filtering and volume control. This includes PrivateLine®/Digital Private Line™ (PL/DPL) encode and alert-tone generation. The IC transmits pre-emphasis on analog signals and applies a low-pass (splatter) filter to all transmitted signals.
Notes 2-6
3 Radio Power Introduction to This Section This section of the manual provides a detailed circuit description of the power distribution for an ASTRO Digital XTS 3000 radio. General In the ASTRO XTS 3000 radio, power (B+) is distributed to two boards: the transceiver board and the controller board. In the case of a secure model radio, B+ is also supplied to the encryption module. Power for the radio is provided through a battery supplying a nominal 7.5Vdc directly to the transceiver.
To/From Controller Board Raw B+ SW B+ VHF/UHF Transceiver Board Fuse UNSW B+ L105 T5 CR109 CR108 ALC U101 RX RF Amp U1/Q1 SB+ L121 L122 Vcc VCOB IC U201 + Battery 7.5V RF PA Module U105 5V Regulator U202 5V T5 Mixer U2 Q107 RX/TX R5 5V Regulator U106 S Out Synth U204 Ref Osc U203 ABACUS U401 D/A IC U102 IF Amp Q601 MAEPF-25994-O Figure 2 B+ Routing for VHF/UHF Transceiver Boards The switched B+ voltage supplies power to circuits on the transceiver board.
B+ Routing for 800MHz Transceiver Boards Refer to Figure 3 and the appropriate schematic diagram. Raw B+ (7.5V) from the battery (Batt B+) enters the radio on the transceiver board through a 3-contact connector (J3). From J3 it is routed through four ferrite beads (E1, E2, E3, E4) and applied to the RF power amplifier (U502) and the ALC IC (U504). Battery B+ is fused and then routed to the controller board, where it enters on connector J1, pins 15 and 20.
B+ and +5V Routing for Controller and Vocoder Boards Refer to Figures 4 and 5 and the appropriate schematic diagrams. Power for the radio is derived from a 7.5 volt battery, which is applied to the transceiver board through J3. This Raw B+, or unswitched B+ (UNSW B+), is routed to J1 on the transceiver board and then on to P201 on the controller board. Here the UNSW B+ is forwarded to the radio’s control top on/off/volume knob through J101 and a flex circuit.
Controls Flex On/Off Switch S1 On B+_Sense Secure Module Off UNSW_B+ SW_B+ P201 UNSW_B+ To/From RF Board UNSW_B+ Switch Q106 SW_B+ Audio PA U718 SW_B+ 5V Regulator U710 +5V Analog To Vocoder Board Q105 B+_CNTL +5V Digital 5V Regulator U709 To Vocoder Board SLIC V U702 HC11F1 MCU U701 32K x 8 EEPROM U706 32K x 8 SRAM U705 Controller Board 1M x 8 FLASH U727 Keypad Module Display Module MAEPF-25996-O Figure 4 B+ Routing for Controller Board 3-5
32K x 8 SRAM U401 +5V Digital From Controller Board 32K x 8 SRAM U402 DSP56001A U405 32K x 8 SRAM U403 ADSIC U406 256K x 8 FLASH U404 +5V Analog From Controller Board Vocoder Board MAEPF-25997-O Figure 5 +5V Routing for Vocoder Board 3-6
VHF/UHF Transceiver Board Detailed Theory of Operation 4 Introduction to This Section This section of the manual provides a detailed circuit description of the ASTRO Digital XTS 3000 VHF and UHF transceiver boards. When reading the theory of operation, refer to the appropriate schematic and component location diagrams located in the back section of this manual. This detailed theory of operation will help isolate the problem to a particular component.
If the two frequencies in the synthesizer’s comparator differ, a control (error) voltage is produced. The phase detector error voltage (V control) at pins 31 and 33 of U204 is applied to the loop filter consisting of resistors R211, R212, and R213, and capacitors C244, C246, C247, and C248. The filtered voltage alters the VCO frequency until the correct frequency is synthesized. The phase detector gain is set by components connected to U204, pins 28 and 29.
Antenna Switch Two antenna switches are part of the radio circuitry. One of the switches is a mechanical connector that attaches to the external antenna bushing. It switches between the radio antenna and a remote antenna. Switching is accomplished by a plunger located on the accessory connector. With a remote antenna installed, continuity between the radio antenna and the RF input line is broken; continuity is made from the remote antenna to the radio RF line. The second switch is a current device.
The RF signal is applied to the mixer at U2 pins 1 and 15. An injection signal (1st LO) of about -10dBm, supplied by the FGU, is applied to U2, pin 8. Mixing of the RF and the 1st LO results in an output signal that is the first IF frequency. The first IF frequencies of the VHF and UHF bands are 45.15MHz and 73.35MHz respectively. The 1st LO signal for VHF is 45.15MHz higher than the carrier frequency, while that for the UHF is 73.35MHz lower than the carrier frequency.
Transmitter The transmitter consists of three major sections: • Harmonic Filter • RF Power Amplifier Module • ALC Circuits Harmonic Filter RF from the power amplifier (PA) module (U105) is routed through the coupler (U104), passed through the transmit antenna switch (CR108), and applied to a harmonic filtering network in UHF.
Notes 4-6
800MHz Transceiver Board Detailed Theory of Operation 5 Introduction to This Section This section of the manual provides a detailed circuit description of an ASTRO Digital XTS 3000 800MHz Transceiver Board. When reading the theory of operation, refer to your appropriate schematic and component location diagrams located in the back section of this manual. This detailed theory of operation will help isolate the problem to a particular component.
both be high; • for talkaround TX frequencies 851-870MHz, pin 6 must be low while pin 7 must be high.
Antenna Switch Switching between the standard and external antenna ports is accomplished with the external mechanical switch that is actuated by a plunger, located on the accessory connector. An electronic PIN diode switch steers RF between the receiver and transmitter. The common node of the switch is at capacitor C101. In the transmit mode, RF is routed to the anode of diode CR104. In receive mode, RF is routed to pin 1 of U201.
Since low-side injection is used, the LO frequency is offset below the RF carrier by 73.35MHz, or Flo = Frf - 73.35MHz. The mixer utilizes GaAs FETs in a double-balanced, Gilbert Cell configuration. The LO port (pin 8) incorporates an internal buffer and a phase shift network to eliminate the need for a LO transformer. The LO buffer bypass capacitors (C208, C221, and C216) are connected to pin 10 of U205, and should exhibit a nominal dc voltage of 1.2 to 1.4Vdc.
The second LO/VCO is a Colpitts oscillator built around transistor Q1. The VCO has a varactor diode (VR401), which is used to adjust the VCO frequency. The control signal for the varactor is derived from a loop filter consisting of C426, C428, and R413. Transmitter The 800MHz RF power amplifier (PA) is a five-stage amplifier (U502). The RF power amplifier has a nominal input and output impedance of 50 ohms.
Notes 5-6
