Tait T2000 II Series Service Manual
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Tait T2000 II Series Service Manual

Tait T2000 II Series Service Manual

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M2000-00
T2000 Series II
Service Manual
Issue 301
March 1998
M2000-00-301
Copyright TEL
31/12/97

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  • Page 1 M2000-00 T2000 Series II Service Manual Issue 301 March 1998 M2000-00-301 Copyright TEL 31/12/97...
  • Page 2 Bangkok 10500 E-mail: tait@t-online.de Thailand Phone: 662 267-6290 Fax: 662 267-6293 Hong Kong E-mail: taitthd@loxinfo.co.th Tait Mobile Radio (Hong Kong) Ltd Room 703A New East Ocean Centre United Kingdom 9 Science Museum Road Tait Mobile Radio Ltd Tsim Sha Tsui East...
  • Page 3 PCB information and/or text are available. You may then order as many packages as you require from your local Tait Company. Revision packages are supplied ready-punched for inclusion in your manual.
  • Page 4 Any enquiries regarding this manual or the equipment it describes should be addressed in the first instance to your nearest approved Tait Dealer or Service Centre. Further tech- nical assistance may be obtained from the Product Support Group, Tait Mobile Radio Division, Tait Electronics Ltd, Christchurch, New Zealand.
  • Page 5 M2000-00 List Of Effective Pages The total number of pages in this Manual is 484, as listed below. Page Issue Date 2.18 31/10/96 2.19 31/10/96 31/12/97 2.20 blank 31/12/97 31/12/97 31/10/96 31/10/96 31/10/96 31/10/96 31/12/97 31/10/96 31/12/97 31/10/96 31/12/97 31/12/97 31/12/97 31/10/96 31/12/97...
  • Page 6 M2000-00 5.17 31/10/96 7.3.5 31/10/96 5.18 31/10/96 7.3.6 31/10/96 5.19 31/10/96 7.3.7 31/10/96 5.20 31/10/96 7.3.8 31/10/96 5.21 31/10/96 7.3.9 31/10/96 (fold-out) 5.22 31/10/96 7.3.10 31/10/96 (fold-out) 5.23 31/10/96 7.4.1 31/10/96 5.24 31/10/96 7.4.2 31/10/96 5.25 31/10/96 7.4.3 31/10/96 5.26 31/10/96 7.4.4 31/10/96...
  • Page 7 M2000-00 7.7.9 31/10/96 (fold-out) 7.11.5 31/10/96 7.7.10 blank 7.11.6 31/10/96 7.8.1 31/10/96 7.11.7 31/10/96 (fold-out) 7.8.2 blank 7.11.8 31/10/96 (fold-out) 7.8.3 31/10/96 7.11.9 31/10/96 (fold-out) 7.8.4 31/10/96 7.11.10 blank 7.8.5 31/10/96 (fold-out) 7.11.11 31/10/96 (fold-out) 7.8.6 blank 7.11.12 blank 7.9.1 31/12/97 7.11.13 31/12/97...
  • Page 8 M2000-00 7.17.3 31/10/96 8.8.5 31/10/96 7.17.4 31/10/96 8.8.6 31/10/96 7.17.5 31/10/96 8.8.7 31/10/96 7.17.6 blank 8.8.8 blank 31/12/97 8.9.1 31/10/96 31/10/96 8.9.2 blank 8.1.1 31/10/96 8.10.1 31/12/97 8.1.2 31/10/96 8.10.2 31/12/97 8.1.3 31/10/96 8.10.3 31/12/97 8.1.4 31/10/96 8.10.4 31/12/97 8.1.5 31/10/96 8.10.5 31/12/97...
  • Page 9 M2000-00 8.13.7 31/12/97 8.16.7 31/12/97 8.13.8 blank 8.16.8 blank 8.14.1 31/10/96 31/10/96 8.14.2 31/10/96 31/10/96 8.14.3 31/10/96 31/10/96 8.14.4 31/10/96 31/10/96 8.14.5 31/10/96 31/10/96 8.14.6 31/10/96 31/10/96 8.14.7 31/10/96 31/10/96 8.14.8 31/10/96 31/10/96 8.14.9 31/10/96 8.14.10 31/10/96 8.14.11 31/10/96 8.14.12 31/10/96 8.14.13 31/10/96...

  • Page 10: Table Of Contents

    M2000-00 Contents General Information Introduction ............1.2 Specifications .
  • Page 11 M2000-00 2.10 T2000-800 RF PCB ........... . 2.14 2.10.1 T2000-800 Receiver.
  • Page 12 M2000-00 Trunked Radios ............4.4 4.3.1 Trunking System Check .
  • Page 13 M2000-00 5.8.2.2 T2040 & T2050 MTM Operation........5.9 5.8.3 Computer Controlled Test Mode (CCTM) .
  • Page 14 M2000-00 PCB Information T2000-100 RF PCB Parts List ......IPN 220-01331-02 ... . . 7.1.1 Mechanical &...
  • Page 15 M2000-00 T2000-800 RF PCB Parts List ......IPN 220-01305-03 ... . . 7.7.1 Mechanical &...
  • Page 16 M2000-00 7.11 T2020, T203X, T2040, T2050 & T2060 HC11 Logic PCB Parts List ......IPN 220-01344-02 ... . 7.11.1 Mechanical &...
  • Page 17 M2000-00 Accessories T2008 Power Supply ..........8.1.1 8.1.1 Operation.
  • Page 18 M2000-00 8.10 T2000-A450X CTCSS & Scrambler Kit ....... . . 8.10.1 8.10.1 Components Required .
  • Page 19 M2000-00 Software Identifying The Software Version Number ....... . 9.2 Software History .
  • Page 20 M2000-00 Figure 8.11.3 T2000-50 9 Way D-Range Connector (S21) ..... . 8.11.7 Figure 8.12.1 T2000-60 UART PCB Mounting ....... 8.12.3 Figure 8.12.2 T2000-60 Test Equipment Set-Up.

  • Page 21: General Information

    General Information M2000-00 General Information This Section introduces the T2000 Series II radio, describing models and features availa- ble and their performance. The following topics are covered in this Section: Section Title Page Introduction Specifications 1.2.1 Introduction 1.2.2 General 1.2.3 Receiver Performance 1.2.4 Transmitter Performance...

  • Page 22: Introduction

    If further information is required about the T2000 or this Manual, it may be obtained from Tait Electronics Ltd or accredited agents. When requesting this information, please quote the equipment product code (e.g. T2010-512-002) and serial number. In the case of the Service Manual, quote the product code (e.g.

  • Page 23: Specifications

    European specifi- cation ETS 300-086. Details of test methods and the conditions which apply for type approval testing in all countries can be obtained from Tait Electronics Ltd. 1.2.2 General Modulation Type ..
  • Page 24 General Information M2000-00 Tx/Rx Offset: T2000-200 .. 0 to 22MHz T2000-300 .. 0 to 38MHz T2000-400, T2000-100 .. 0 to 50MHz T2000-500, T2000-600 .. 0 to 70MHz T2000-700 .. 0 to 30MHz T2000-800 .. 0 to 45MHz T2000-900 .. 0 to 40MHz Supply Voltage: Operating Range ..

  • Page 25: Receiver Performance

    General Information M2000-00 Remote Control Head Dimensions: Length .. 26mm Width .. 159mm Height .. 51mm Weight (radio & control head) .. 1.2kg 1.2.3 Receiver Performance Type: All Except T2000-200 .. triple conversion superheterodyne T2000-200 .. dual conversion superheterodyne Sensitivity: 12dB Sinad ..
  • Page 26 General Information M2000-00 Audio: Minimum Load Impedance .. 2Ω Rated Power (into 4Ω) .. 4W (at 1kHz) Distortion: @ Rated Power (1kHz) .. <5% @ 0.5W (0.3 to 3.0kHz) .. <3% (narrow band) <2.5% (medium band) <2% (wide band) Response ..

  • Page 27: Transmitter Performance

    General Information M2000-00 1.2.4 Transmitter Performance Power Output: Maximum: All Except T2000-800 .. 30W T2000-8000 .. 25W High (high setting): All Except T2000-800 .. 25W T2000-8000 .. 15W Low (low setting): T2000-200, -300, -400 .. 1 to 25W T2000-100, -500, -600, -700, -900 ..

  • Page 28: Frequency Reference

    General Information M2000-00 Audio: Microphone Type .. dynamic or electret Input For 60% Deviation .. 1.5mVrms maximum (at 1kHz) Distortion .. 5% Hum & Noise: All Except T2000-800: Narrow Band .. 39dB Medium Band .. 43dB Wide Band .. 45dB T2000-800: Wide Band ..

  • Page 29: Trunking

    General Information M2000-00 1.2.6 Trunking 1.2.6.1 T2030, T2035, T2040 & T2050 Models Data Modulation .. as per MPT1317 Data Deviation (Tx: 60% full system deviation): Narrow Band .. 1.5kHz Medium Band .. 2.4kHz Wide Band .. 3kHz 1.2.6.2 T2060 Model ®...

  • Page 30: Product Codes

    The following explanation of the T2000 product codes is not intended to suggest that any combination of features is necessarily available in any one radio. For details regard- ing availability of specific T2000 radios, consult your nearest Tait dealer or subsidiary. Model...

  • Page 31: Circuit Description

    Circuit Description M2000-00 Circuit Description This Section describes the operation of the basic circuit blocks found in the T2000 radio. Refer also to the circuit diagrams in Section 7 of this Manual. The following topics are covered in this Section: Section Title Page...

  • Page 32: Design Overview

    Circuit Description M2000-00 Design Overview The T2000 radio is made up of two modules, the RF module and the control module. The RF module consists of an RF PCB unique to each frequency band with common plug-in IF and TCXO/Tx audio PCBs, determining the frequency stability and reference frequency.

  • Page 33: Synthesiser

    Circuit Description M2000-00 Synthesiser Synthesiser IC201 (MC145158) receives channel and reference frequency information from the microprocessor via a three line serial interface: • DATA - synthesiser data: A counter: 7 bits M counter: 10 bits Ref. counter: 14 bits • CLK - synthesiser clock •...

  • Page 34: Audio & Regulators

    Circuit Description M2000-00 Audio & Regulators The nominal supply voltage of the T2000 is 13.8VDC but satisfactory operation is possi- ble from supply voltages of between 10.8 and 16V. Power for the radio is switched via the volume control and switch on the control head. Overvoltage protection is provided in the form of an 18V zener diode.

  • Page 35: If Pcb

    Circuit Description M2000-00 IF PCB The l0.7MHz signal from the RF PCB feeds Q104, passes through a crystal filter (Xl0l) and is amplified by Q111 and Q112 before passing through a 10.7MHz ceramic filter to a mixer/oscillator (Qll3). This 455kHz mixer output is further filtered and amplified by CF102, CF103 and Q114, then passes back to the RF PCB where it is demodulated by IC101.

  • Page 36: T2000-100 & -400 Rf Pcb

    Circuit Description M2000-00 T2000-100 & -400 RF PCB Figure 2.3 T2000-100 & -400 RF PCB Block Diagram 2.6.1 T2000-100 & -400 Receiver The incoming signal from the antenna via the PIN switch passes through a high pass fil- ter to the RF amplifier, Q101. The 50Ω output from the amplifier is coupled to a varicap tuned triplet which provides the spurious response rejection necessary for the first mixer.

  • Page 37: T2000-100 & -400 Exciter

    Circuit Description M2000-00 L114 and L116 form a 50Ω delay line which provides the spurious response rejection necessary for the second mixer. L114 and L116 also provide the delay necessary for the noise blanker to detect and clamp noise pulses. The local oscillator signal of 38.4MHz for the second double balanced mixer is provided by the 12.8MHz reference via a tripler circuit, and the 10.7MHz output feeds the plug-in IF PCB.

  • Page 38: T2000-200 Rf Pcb

    Circuit Description M2000-00 T2000-200 RF PCB Figure 2.4 T2000-200 RF PCB Block Diagram 2.7.1 T2000-200 Receiver The incoming signal from the antenna via the PIN switch passes through a high pass fil- ter to the RF amplifier, Q101. The 50Ω output from the amplifier is coupled to a varicap tuned triplet that provides the spurious response rejection necessary for the first mixer.

  • Page 39: T2000-200 Exciter

    Circuit Description M2000-00 L114 and L116 form a 50Ω delay line that provides the delay necessary for the noise blanker to detect and clamp noise pulses and also provides a high impedance point for the signal to be clamped. The 10.7MHz output feeds the plug-in IF PCB through R128, R129 and R132 which pro- vide the attenuation equivalent to the second mixer of the T2000-300, T2000-400, T2000- 500 or T2000-600.

  • Page 40: T2000-300 Rf Pcb

    2.10 Circuit Description M2000-00 T2000-300 RF PCB Figure 2.5 T2000-300 RF PCB Block Diagram 2.8.1 T2000-300 Receiver The incoming signal from the antenna via the PIN switch passes through a high pass fil- ter to the RF amplifier, Q101. The 50Ω output from the amplifier is coupled to a varicap tuned triplet which provides the spurious response rejection necessary for the first mixer.

  • Page 41: T2000-300 Exciter

    Circuit Description 2.11 M2000-00 L114 and L116 form a 50Ω delay line which provides the spurious response rejection necessary for the second mixer. L114 and L116 also provide the delay necessary for the noise blanker to detect and clamp noise pulses. The local oscillator signal of 38.4MHz for the second double balanced mixer is provided by the l2.8MHz reference via a tripler circuit, and the 10.7MHz output feeds the plug-in IF PCB.

  • Page 42: T2000-500, T2000-600, T2000-700, -900 & -000 Rf Pcb

    2.12 Circuit Description M2000-00 T2000-500, T2000-600, T2000-700, -900 & -000 RF Figure 2.6 T2000-500, -600, -700, -900 & -000 RF PCB Block Diagram 2.9.1 T2000-500, -600, -700, -900 & -000 Receiver The incoming signal from the antenna via the PIN switch passes through a high pass fil- ter to the RF amplifier, Q101.

  • Page 43: T2000-500, -600, -700 -900 & -000 Exciter

    Circuit Description 2.13 M2000-00 The VCO output is fed to the first double balanced mixer via a low pass filter to reduce harmonic content. The VCO signal is 49.lMHz below the RF signal and the first mixer output (at 49.lMHz) feeds the first post-mixer buffer, Q103. The output of Q103 feeds both a delay line and the noise blanker circuit.

  • Page 44: T2000-800 Rf Pcb

    2.14 Circuit Description M2000-00 2.10 T2000-800 RF PCB Figure 2.7 T2000-800 RF PCB Block Diagram 2.10.1 T2000-800 Receiver The incoming signal from the antenna via the PIN switch passes through a band pass filter to the RF amplifier, Q101. The 50Ω output from the amplifier is coupled to a sec- ond band pass filter, and these two filters provide the spurious response rejection neces- sary for the first mixer.

  • Page 45: T2000-800 Exciter

    Circuit Description 2.15 M2000-00 L114 and L116 form a 50Ω band pass filter which provides the spurious response rejec- tion necessary for the second mixer. The local oscillator signal of 51.2MHz for the sec- ond double balanced mixer is provided by the 12.8MHz reference via a times 4 multiplier circuit, and the 10.7MHz output feeds the plug-in IF PCB.

  • Page 46: Control Module

    2.16 Circuit Description M2000-00 2.11 Control Module The primary task of the control section in the T2000 is to control the state of the radio at all times, based both on user input, and activity of the internal circuitry. To achieve this, the control section monitors the radio’s operation and responds to any changes with various control signals.

  • Page 47: Figure 2.9 T2015 & T2060 Control Head Block Diagram

    Circuit Description 2.17 M2000-00 Figure 2.8 2010 & T2030 Control Head Block Diagram Figure 2.9 T2015 & T2060 Control Head Block Diagram Copyright TEL 31/10/96...

  • Page 48: Figure 2.10 T2020, T2040 & T2050 Control Head

    2.18 Circuit Description M2000-00 Figure 2.10 T2020, T2040 & T2050 Control Head Block Diagram 31/10/96 Copyright TEL...

  • Page 49: T2020, T203X, T2040, T2050 & T2060 Hc11 Logic Pcb

    Circuit Description 2.19 M2000-00 2.11.2 T2020, T203X, T2040, T2050 & T2060 HC11 Logic PCB Transmitter speech from the microphone is preamplified and fed into an automatic level control circuit which also has three mute facilities (one for options and two for the microprocessor).
  • Page 50 2.20 Circuit Description M2000-00 31/10/96 Copyright TEL...

  • Page 51: Introduction To Servicing

    Introduction To Servicing M2000-00 " 8]ca^SdRcX^]ñC^ñBTaeXRX]Vñ This Section provides information necessary for servicing T2000 Series II radios, and covers the following topics: Section Title Page Servicing Precautions 3.1.1 Caution: Accidental Transmit 3.1.2 Caution: Antenna Loading 3.1.3 Caution: Beryllium Oxide & Power Transistors 3.1.4 Caution: CMOS Devices 3.1.5...

  • Page 52: Servicing Precautions

    Introduction To Servicing M2000-00 Servicing Precautions 3.1.1 Caution: Accidental Transmit Under certain circumstances the microprocessor can key the transmitter. Ensure that all instruments are protected from accidental transmit at all times. 3.1.2 Caution: Antenna Loading The equipment has been designed to operate with a 50Ω termination impedance, but will tolerate a wide range of antenna loading conditions.

  • Page 53: Caution: Screw Head Types

    Introduction To Servicing M2000-00 3.1.5 Caution: Screw Head Types Pozidriv screws are the preferred standard on all T2000 series equipment. Pozidriv No. 1 and 2 screwdrivers will fit all pozidriv screws used in the T2000: Philips cross-head screwdrivers are not satisfactory for use on these screws. The following diagram identifies the differences between Philips and Pozidriv screw- drivers.

  • Page 54: Figure 3.3 T2000 Series Ii Radio Assembly

    Introduction To Servicing M2000-00 Item Description Quantity Torque (in.lb) TOP COVER 303-23134-01 LOGIC PCB SEE PARTS LIST SCREW M3X8 PANPOZI TAPTITE (LOGIC PCB SCREWS) 349-00020-32 MACHINE SCREW M4X25 (MICRO. SHIELD SCREWS) 345-00050-18 MICROPROCESSOR SHIELD 319-01164-XX CHASSIS 308-13093-XX D-RANGE BLANKING PLATE 360-01053-XX SCREW M3X8 PANPOZI TAPTITE (RF CONNECTOR SCREWS) 349-00020-32...

  • Page 55: Disassembly Instructions

    Introduction To Servicing M2000-00 Disassembly Instructions Caution: To carry out alignment it is necessary to remove only the top cover (1) and logic PCB retaining screws (3). It is essential that the bottom cover (13) and microprocessor shield (5) with its three retaining screws (4) are torqued down as specified in Figure 3.3.

  • Page 56: To Detach The Control Head

    Introduction To Servicing M2000-00 3.2.3 To Detach The Control Head 3.2.3.1 Locally Mounted Models Remove all covers, as instructed in Section 3.2.2. Unplug the loom running between the control head and the logic PCB. Note: In EMC model radios, the loom connects to a Micromatch connector on the EMC filter PCB (refer to Section 3.2.5).

  • Page 57: To Disassemble The Control Head

    Introduction To Servicing M2000-00 3.2.4 To Disassemble The Control Head 3.2.4.1 T2010, T2015, T203X & T2060 Radios Item Description Quantity Torque (in.lb) KNOB 311-01042-XX MICROPHONE GROMMET 360-02003-XX FRONT PANEL 316-03095-XX VOLUME POT NUT SEE PARTS LIST (SECTION 7) VOLUME POT WASHER VOLUME POT LIGHTSPREADER 304-07037-XX LIGHTSPREADER BUTTON...
  • Page 58 Introduction To Servicing M2000-00 The screws used in the control head are No. 4 Plastites, and should not be con- fused with the M3 screws used elsewhere. When being replaced, the No. 4 Plas- tite screws must be tightened to a torque of 8in.lb (0.9Nm). With the control head face down, gently remove the PCB (13), along with the key- pad (8) and lightspreader (7).

  • Page 59: T2020, T2040 & T2050 Radios

    Introduction To Servicing M2000-00 3.2.4.2 T2020, T2040 & T2050 Radios Item Description Quantity Torque (in.lb) KNOB 311-01042-XX MICROPHONE GROMMET 360-02003-XX FRONT PANEL 316-06427-XX VOLUME POT NUT SEE PARTS LIST (SECTION 7) VOLUME POT WASHER LIQUID CRYSTAL DISPLAY (LCD) 008-02029-XX LIGHTSPREADER 304-07036-XX ENHANCED KEYPAD 311-03096-XX...

  • Page 60: Figure 3.6 T2020, T2040 & T2050 Control Head Assembly - Remotely Mounted

    3.10 Introduction To Servicing M2000-00 With the control head face down, gently remove the PCB (13), along with the key- pad (8) and lightspreader (7). Do not disturb the positioning or height of the LEDs, as this is critical for reas- sembly.

  • Page 61: To Detach The Emc Filter Pcb

    Introduction To Servicing 3.11 M2000-00 3.2.5 To Detach The EMC Filter PCB Refer to Figure 3.7. Remove the top cover and open the logic PCB, as described in Section 3.2.1. Remove the microprocessor shield and bottom cover, as described in Section 3.2.2. The control head (locally mounted models) or dummy front panel (remotely mounted models) can now be removed.

  • Page 62: Power Amplifier - Special Instructions

    3.12 Introduction To Servicing M2000-00 Power Amplifier - Special Instructions Caution: As the location of certain components in the PA is critical to performance, it is important that any components removed or disturbed are refitted in exactly the same location. 3.3.1 To Replace PA Transistors Desolder the tabs by heating them with a soldering iron, then lifting them up...

  • Page 63: Repair

    Tait Dealer or Service Centre equipped with the necessary facil- ities. Repairs attempted with incorrect equipment or by untrained person- nel may result in permanent damage. If in doubt, contact Tait Electronics Ltd or your nearest Tait Branch or Subsidiary.

  • Page 64: Figure 3.8 Identifying Smd Components

    3.14 Introduction To Servicing M2000-00 • Soldering iron: for use on electrolytic capacitors and plastic coated devices that may be damaged by a heat gun. • Microscope: for individual SMD inspection and for SMD replacement. Use the following diagram to identify types of SMD components. RESISTOR MELF PLCC...

  • Page 65: Removal & Replacement Of Smd Components

    Introduction To Servicing 3.15 M2000-00 3.4.1.3 Removal & Replacement Of SMD Components Refer to Figure 3.9. Capacitors, Resistors, MELF & SOT Hold the nozzle of the hot air tool above the component and keep it moving to ensure that the PCB is not damaged. Remove the SMD and clean away any glue using the hot air tool and a pair of tweezers.

  • Page 66: Figure 3.9 Smd Soldering Guide

    3.16 Introduction To Servicing M2000-00 adaquate solder insufficient solder excess solder capacitor & resistor MELF SOIC (gull leads) PLCC (J leads) Figure 3.9 SMD Soldering Guide 31/10/96 Copyright TEL...

  • Page 67: Common Causes Of Smd Failure

    Introduction To Servicing 3.17 M2000-00 3.4.1.4 Common Causes Of SMD Failure Cracked SMD Most often occurs with capacitors, caused by: • Thermal shock: if the SMD is heated too rapidly either it will crack or internal seals will be lost, resulting in premature failure. •...

  • Page 68: Component Cutting Method

    3.18 Introduction To Servicing M2000-00 3.4.2.2 Component Cutting Method Cut the leads on the component side of the PCB. Heat the solder joint sufficiently to allow easy removal of the lead by drawing it out from the component side: do not use undue force. Fill the hole with solder and then clear with solderwick.

  • Page 69: Functional Tests

    Functional Tests M2000-00 Functional Tests This Section details test procedures will confirm that the T2000 has been adjusted cor- rectly and is fully operational. The following topics are covered: Section Title Page Test Equipment Required Connecting The Radio Trunked Radios 4.3.1 Trunking System Check Receiver Performance Tests...

  • Page 70: Test Equipment Required

    Functional Tests M2000-00 Test Equipment Required The following equipment is required for functional testing. • Power supply cord, wired as shown in Section 8.3. • Power supply adjustable between 9 & 16V DC, with a capacity of at least 8A. •...

  • Page 71: Connecting The Radio

    Functional Tests M2000-00 Connecting The Radio The following diagram shows a suggested test equipment set-up. RECEIVER TEST SET-UP OSCILLOSCOPE AUDIO SINAD METER METER AERIAL SIGNAL T2000 GENERATOR CONNECTOR OSCILLOSCOPE TRANSMITTER TEST SET-UP AF OUTPUT MODULATION POWER FREQUENCY METER METER COUNTER AERIAL T2000 CONNECTOR...

  • Page 72: Trunked Radios

    Functional Tests M2000-00 Trunked Radios The ‘test’ facility enables T2000 trunked radios to emulate a multichannel radio, using the frequencies reserved for trunking. For a description of how to put the radio in test mode, refer to Section 5.8, “Trunked Radios: Test Mode”.

  • Page 73: Receiver Performance Tests

    Functional Tests M2000-00 Receiver Performance Tests In this Section, deviation settings are given first for wide band, followed by settings for medium band in brackets ( ) and settings for narrow band in square brackets [ ]. 4.4.1 To Check The Squelch Operation Connect a sinad meter across the speaker terminals.

  • Page 74: To Check The Audio Output Level And Distortion

    Functional Tests M2000-00 4.4.3 To Check The Audio Output Level And Distortion Connect an audio millivoltmeter and an oscilloscope across the speaker terminals. Connect an on-channel RF signal generator to the antenna input socket, with the output set to -107dBm (1V) modulated to ±5kHz (±4kHz) [±2.5kHz] deviation at 1kHz AF.

  • Page 75: To Check The Signal+Noise To Noise Ratio

    Functional Tests M2000-00 4.4.5 To Check The Signal+Noise To Noise Ratio Set the signal generator output level to -107dBm modulated to ±5kHz (±4kHz) [±2.5kHz] deviation at 1kHz AF. Connect an audio millivoltmeter across the speaker terminals. Set the volume control for a reading of 0.8V (0dBm) on a convenient scale on the millivoltmeter.

  • Page 76: To Check The Operation Of The Noise Blanker

    Functional Tests M2000-00 4.4.8 To Check The Operation Of The Noise Blanker Connect an ignition noise simulator and an RF signal generator to the receiver antenna input. Set the signal generator modulation for ±3kHz (±2.4kHz) [±1.5kHz] deviation at 1kHz AF. Set the signal generator output level to give a 20dB sinad.

  • Page 77: Transmitter Performance Tests

    Functional Tests M2000-00 Transmitter Performance Tests In this Section, deviation settings are given first for wide band, followed by settings for medium band in brackets ( ) and settings for narrow band in square brackets [ ]. 4.5.1 Audio Processor 4.5.1.1 To Check The Limiter Circuit Operation Connect an oscilloscope to monitor the waveform at TSP901 (TCXO PCB).

  • Page 78: To Check The Gain Of The Audio Processor

    4.10 Functional Tests M2000-00 4.5.1.3 To Check The Gain Of The Audio Processor Connect the T2000 antenna output via a 30dB attenuator to a modulation meter. Plug the microphone test lead into the control head microphone input socket. Apply a 1kHz sine wave and adjust the output level to give a 3kHz (2.4kHz) [1.5kHz] deviation reading on the modulation meter.

  • Page 79: To Check The Rf Power Control Circuit

    Functional Tests 4.11 M2000-00 4.5.3 To Check The RF Power Control Circuit Connect an RF power meter to the transmitter output. Select a channel programmed for high power (25W). Close the PTT switch. Vary the supply voltage between 10.8 and 16V. Above 13.8V the RF power output should not increase by more than 2W.
  • Page 80 4.12 Functional Tests M2000-00 31/10/96 Copyright TEL...

  • Page 81: Fault Finding

    Fault Finding M2000-00 5Pd[cñ5X]SX]Vñ This Section provides general fault finding assistance, and is intended to be used in con- junction with the circuit descriptions and block diagrams in Section 2 and the circuit diagrams and PCB information in Section 7. The following topics are covered in this Section: Section Title...

  • Page 82: Servicing Warning

    Section 3, “Introduction To Servicing”. Repairs attempted with incorrect equipment or by untrained personnel may result in permanent damage. If in doubt, contact Tait Electronics Ltd or your nearest Tait Branch or Subsidiary. Visual Checks Check that the radio is suitable for the required frequency range and IF band- width (refer to Section 1.4, “Product Codes”).

  • Page 83: Dc Checks

    Fault Finding M2000-00 DC Checks Refer to the “Radio Won’t Switch On” fault finding chart in Section 5.10.1. Check all regulated supply voltages for the correct voltage levels. DC levels can be checked using the voltage information on the circuit diagrams. Copyright TEL 31/10/96...

  • Page 84: Receiver Rf Checks

    Fault Finding M2000-00 Receiver RF Checks 5.5.1 VCO Frequency Check that the VCO is phase locked. Connect a frequency counter (level +10dBm) to the VCO input to the mixer (junction of C241 and L109). Monitor the local oscillator frequency and check that it is above or below the required receive frequency according to the following list: Model Local Oscillator Frequency...

  • Page 85: Rf Sensitivity

    Fault Finding M2000-00 5.5.3 RF Sensitivity Refer to the “Synthesiser Faults”, “Receiver Front End Faults” and “Receiver IF Faults” fault finding charts in Section 5.10. Check that the VCO is on the correct frequency, and that the receiver is correctly aligned.

  • Page 86: Trunked Radios: System Check

    Fault Finding M2000-00 Trunked Radios: System Check 5.7.1 Base Station Check This checks that the local base station repeater is on air and checks that the correct base station frequency is programmed into the radio. 5.7.1.1 T2030 Radios Reprogram the first normal hunt channel to be the base station repeater channel number.

  • Page 87: Trunked Radios: Test Mode

    Fault Finding M2000-00 Trunked Radios: Test Mode 5.8.1 Test Mode Overview The test mode facility enables the trunked radio to emulate a multichannel radio, utilis- ing the frequencies reserved for trunking. The radio can then be tested and aligned, as described in Section 4 and Section 6.

  • Page 88: T2030 & T2035 Mtm Operation

    Fault Finding M2000-00 In MTM, the following operations are common to T203X, T2040 and T2060 radios: • A short beep is sounded after every key press. • All models accept the reset command character (^). • The microphone PTT switch functions as in normal operation, i.e. a PTT press/ release selects transmit and receive respectively.

  • Page 89: T2040 & T2050 Mtm Operation

    Fault Finding M2000-00 • The despatch key selects MSK modem transmit test patterns. The despatch LED is off for zeros, on for ones and flashing when preamble is being sent. Successive depressions of the key will scroll through the three states. Whenever the despatch is pressed, the modem transmit is enabled unless the radio is in receive, in which case the clear LED will illuminate momentarily.

  • Page 90: Cctm Selection

    5.10 Fault Finding M2000-00 5.8.3.1 CCTM Selection After power-up, a reset command or a hardware reset, the radio sends the logon prompt character “v”. Replying with an ASCII “%” within 500ms of the prompt will put the radio in CCTM. The radio will confirm engagement of CCTM by sending the prompt “-”, preceded by a “CR”.

  • Page 91: Power-Up State

    Fault Finding 5.11 M2000-00 5.8.4 Power-Up State When manual or automated test mode is engaged after logon, the radio will be in the following state, where applicable to particular radio models. The numbers in brackets refers to the test facility, as described in Table 5.1, “T2000 Test Facilities”. •...

  • Page 92: Test Facilities Table

    5.12 Fault Finding M2000-00 5.8.5.2 Test Facilities Table The following table lists the test facilities available in MTM and CCTM for the T203X, T2040 and T2050. Facilities for the T2010, T2015 and T2020 are also listed for compari- son, and further information about the tests is listed following the table. Within the table, a ‘-’...
  • Page 93 Fault Finding 5.13 M2000-00 T2010/T2015 T2020 T203X T2040/T2050 Normal CCTM Normal CCTM Auto Auto Special functions: 92. set ‘sticky’ MTM “92” “92” 93. clear ‘sticky’ MTM “93” “93” 94. read serial number “94” “94” “94” “94” 95. read factory model ID “95”...
  • Page 94 5.14 Fault Finding M2000-00 • 14, 25, 72: These functions return a Boolean radio status value, either a ‘0’ or a ‘1’, as follows: Return Value ‘0’ ‘1’ 14 - read modem Rx state data = 0 data = 1 25 - read Rx busy state no RF signal detected RF signal detected...

  • Page 95: Trunked Radios: Radio Mode/Status Display Codes

    Fault Finding 5.15 M2000-00 5.8.6 Trunked Radios: Radio Mode/Status Display Codes The mode or status of the radio is indicated by the behaviour of: • the monitor LEDs (ML1 and ML2) on the top side of the logic PCB • the radio control head LEDs. Unless otherwise stated, the two monitor LEDs behave as in normal operation: •...
  • Page 96 5.16 Fault Finding M2000-00 Mode/State T2010/T2015 T2020 T2030/T2035 T2040 2010: all channel Display shows Top row + C1 LEDs Display shows LEDs on “-PROG-” all on (if fitted) “-PROG-” Program mode 2015: display shows Top row LEDs on T2033/35: display Top row LEDs on “00”...

  • Page 97: Options Interface Specifications

    Fault Finding 5.17 M2000-00 Options Interface Specifications The options connectors, S13 and S14, are located on the top side of the T2000 logic PCBs, and are provided for use with plug-on accessory PCBs. The following tables describe the signals available on these connectors, and also on S15 (T2010 &...
  • Page 98 5.18 Fault Finding M2000-00 Sink Source Logic Logic Connection Function Levels Sense BUSY S14-3 carrier detect 0V 5V 0V = busy 0.5mA 0.1mA opening time: <35ms closing time: <20ms (8dB sinad, 6dB margin) RX-GATE S14-4 Rx audio gate information 5V CMOS 5V = audio 1.5mA 0.3mA /PTT-TO-OPT...
  • Page 99 Fault Finding 5.19 M2000-00 BCD Channel Number Codes Channel Number Number BCD-5 BCD-4 BCD-3 BCD-2 BCD-1 BCD-0 Table 5.6 BCD Channel Selection (T2010 & T2015 only) Connectors S16, S17 and S18 Additional microprocessor control signals are available on the T2020, T203X, T2040, T2050 and T2060 HC11 logic PCB (PCB IPN 220-01344-0X), on connectors S16, S17 and S18.

  • Page 100: Fault Finding Charts

    5.20 Fault Finding M2000-00 5.10 Fault Finding Charts The fault finding charts listed below are intended to be used in conjunction with the cir- cuit diagrams and other PCB information found in Section 7, and with the circuit descriptions and block diagrams found in Section 2. Section Title Page...

  • Page 101: Radio Won't Switch On

    Fault Finding 5.21 M2000-00 5.10.1 Radio Won’t Switch On Radio will not switch on. Check power Is 13.8V present on connector & IC402 pin 3 (TDA1020)? external fuse. Check D1 & L1. Open front panel/ control head: is Check tracks Is 13.8V present Check for a 13.8V (T2010, T2015, T203X)

  • Page 102: Radio Won't Program

    5.22 Fault Finding M2000-00 5.10.2 Radio Won’t Program Radio will not program T2010/15 only T2020, T203X T2040 Check 5V supply, Microprocessor Is ML1 flashing RxD & TxD lines & O.K. once/second?(If fitted) programming lead. Check RxD and TxD Check 5V supply lines to microprocessor from microphone socket Are both ML1and...

  • Page 103: Synthesiser Faults

    Fault Finding 5.23 M2000-00 5.10.3 Synthesiser Faults Is radio programmed Take corrective correctly? action Synth. fails to lock, control head Synthesiser OK indicates synth. fault? Any cracked, loose, Take corrective Note: broken, or missing action Division ratios are as follows (IC203): components? T2000-200 40/41 | T2000-300 64/65...

  • Page 104: Receiver Front End Faults

    5.24 Fault Finding M2000-00 5.10.4 Receiver Front End Faults Rx tune voltage See synthesiser Is VCO in lock? present? Fault Finding Chart Check IC120B & associated components Is Q101 Check 8V SW supply, collector approx. Q102 & associated 4.8VDC? circuitry Sensitivity into If faulty, see base of Q103 better...

  • Page 105: Receiver If Faults

    Fault Finding 5.25 M2000-00 5.10.5 Receiver IF Faults Sensitivity into 2nd mixer L117 (or into pad on Fault in 1st or T2000-200) with 2nd mixer. delay line removed < -113dBm? Replace IF board, remeasure. Sens. Check faulty IF better than -113dBm PCB circuitry into 2nd mixer (or pad in T2000-200)?

  • Page 106: Receiver Mute Faults

    5.26 Fault Finding M2000-00 5.10.6 Receiver Mute Faults Apply on channel *Modulated 3kHz (1.5kHz) deviation at 1kHz. signal @ -117dBm* Check quad coil L119 Audio on IC101 & damping resistor pin 9 (main brd)? on pin 1, IF PCB Check components in Amplified noise active filter IC101 on IC101 pin 11?

  • Page 107: No Audio On Receive

    Fault Finding 5.27 M2000-00 5.10.7 No Audio On Receive Rx tune voltage See synthesiser Is VCO in lock? present? Fault Finding Chart Check IC120B & associated components Is Q101 Check 8V SW supply, collector approx. Q102 & associated 4.8VDC? circuitry Sensitivity into If faulty, see base of Q103 better...

  • Page 108: Transmitter Rf Low Power Faults

    5.28 Fault Finding M2000-00 5.10.8 Transmitter RF Low Power Faults Power control pot Note: at max. Select Measure RF voltages with high power. a 'COLINE' M12 probe or similar. Keep earth leads as short as possible. Is the power low? Is RF voltage at 1st Amp.
  • Page 109 Fault Finding 5.29 M2000-00 Continued T2000-200/ -300/ -400/ -500/ -600/ -700 T2000-800 Is RF voltage at driver base ≥ ≥ ≥ ≥ T2000-200 1.0V? Is R.F. Voltage at Check interstage ≥ ≥ ≥ ≥ T2000-300 3.0V? module input components ≥ ≥ ≥ ≥ T2000-400 2.2V? 0.7V?

  • Page 110: Transmitter Power Control Faults

    5.30 Fault Finding M2000-00 5.10.9 Transmitter Power Control Faults Low power will Ouput power not adjust correctly suddenly jumps to 0, while adjusting RV324 Voltage across R505 Program radio Check R332, R331, 4.2 - 5VDC for low power TP301 >3VDC with R329, D301.

  • Page 111: 5.10.10 Transmit Audio Absent

    Fault Finding 5.31 M2000-00 5.10.10 Transmit Audio Absent Check input to loop Audio on S6-8 filter & reference on TCXO plug? frequency modulation attenuator. Check Tx audio circuitry on TCXO Audio on S6-6 Audio on S6-8 board. Check RV907 on TCXO plug? on TCXO plug? is not turned down.

  • Page 112: Trunked Radios: Radio Won't Acquire A Control Channel

    µP. * * If µP. is changed, activity on IC14 (If not possible, the ESN must be Change IC510 pins 6 and 3? Is return to TAIT reprogrammed. pin 7 low? National Technical Return to TAIT Service Centre.) National Technical Service Centre.

  • Page 113: Tuning & Adjustment

    Tuning & Adjustment M2000-00 Tuning & Adjustment This Section details procedures for tuning and adjustment of T2000 series II radios. This is normally only required during product manufacture or after major servicing. The following topics are covered in this Section: Section Title Page...

  • Page 114: Tuning Precautions

    Tuning & Adjustment M2000-00 Tuning Precautions Refer to Section 4.1 for a list of test equipment required and a suggested test set-up. The following precautions must be observed when carrying out the alignment procedures in this Section. • The microprocessor shield must remain in place throughout the alignment proce- dure, with its 3 retaining screws torqued down to 8in.lbf (0.9Nm).

  • Page 115: Tuning & Adjustment Points

    Tuning & Adjustment M2000-00 Tuning & Adjustment Points The following table lists tuning and adjustment points, and Figure 6.1 shows their posi- tion on the RF and TCXO/Tx audio PCBs. The PCB layouts in Section 7 have all relevant logic PCB test and adjustment points marked.

  • Page 116: Figure 6.1 Rf & Txco/Tx Audio Pcbs - Tuning & Adjustment Points

    Tuning & Adjustment M2000-00 (T2000-800 only) Figure 6.1 RF & TXCO/Tx Audio PCBs - Tuning & Adjustment Points- 31/12/97 Copyright TEL...

  • Page 117: Trunked Radios

    Tuning & Adjustment M2000-00 Trunked Radios The ‘test’ facility enables T2000 trunked radios to emulate a multichannel radio, using the frequencies reserved for trunking. For a description of how to put the radio in test mode, refer to Section 5.8 “Trunked Radios: Test Mode”.

  • Page 118: Tcxo Alignment

    Tuning & Adjustment M2000-00 6.4.2 TCXO Alignment Close the PTT switch and monitor the transmit frequency with a frequency coun- ter. Adjust RV923 on the TCXO/Tx audio PCB for a channel frequency within ±100Hz at ambient temperature. 6.4.3 Dual Point Modulation Adjustment DC isolate the audio generator from TSP901 using a capacitor (10µF is sufficient).

  • Page 119: Ctcss Modulation Adjustment

    Tuning & Adjustment M2000-00 6.4.4 CTCSS Modulation Adjustment The following instructions apply only to those radios with CTCSS activated and must be carried out before any further modulation adjustment can proceed. Refer to the T2000 Programming Manual for the CTCSS channel programming instructions.

  • Page 120: Selcall Tone Deviation

    Tuning & Adjustment M2000-00 6.4.7 Selcall Tone Deviation This is normally preset at 60% of voice deviation. If adjustment is needed, fit #RV508 (refer to Section 7 for a component description) to the logic PCB, and pro- ceed as follows. Adjust #RV508 for ±3kHz (±2.4kHz) [±1.5kHz] deviation reading on the modula- tion meter.

  • Page 121: Receiver Adjustments

    Tuning & Adjustment M2000-00 Receiver Adjustments In this Section, deviation settings are given first for wide band, followed by settings for medium band in brackets ( ) and settings for narrow band in square brackets [ ]. 6.5.1 RF Alignment Set up the test equipment as shown in Section 4, and select the highest possible frequency in the operating band.

  • Page 122: Internal Mute Control

    6.10 Tuning & Adjustment M2000-00 6.5.2 Internal Mute Control If required, the mute setting can be adjusted internally as follows. Align the receiver, as described in Section 6.5.1. Adjust RV153 fully clockwise. Set the signal generator to the required receive frequency. Set the modulation for ±3kHz (±2.4kHz) [±1.5kHz] deviation at 1kHz AF.
  • Page 123 PCB Information M2000-00 PCB Information This Section provides parts lists, circuit diagrams and component location information on the individual PCBs within the T2000 Series II radio. The following PCBs are covered within this Section: Section Title Page Frequency (MHz) T2000-100 RF PCB IPN 220-01331-02 7.1.1 220 to 270...
  • Page 124 PCB Information M2000-00 PCB Identification All PCBs are identified by a unique 10 digit ‘internal part number’ (IPN), e.g. 220-01330-02, which is screen printed onto the PCB (usually the top side). The last 2 digits of this number define the issue status, which starts at 00 and increments through 01, 02, 03, etc.
  • Page 125 PCB Information M2000-00 Parts Lists The 10 digit numbers (000-00000-00) in the parts lists are ‘internal part numbers’ (IPNs). Your spare parts orders can be handled more efficiently if you quote the IPN and pro- vide a brief description of the part. The components listed in the parts lists are divided into two main types: those with a circuit reference (e.g.
  • Page 126 PCB Information M2000-00 Locating Components Grid Reference Indexes To assist in locating components and labelled pads on the PCB layouts and circuit dia- grams, a component grid reference index has been provided. This index lists the compo- nents and pads in alphabetical order, along with the appropriate alphanumeric grid references, as shown below.

This manual is also suitable for:

T2030T2035T2040T2050T2060

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