Page 1 TM8000 mobiles TM8100 Mobile Radio Service Manual MM8100-02-00-812 Version 3.00 May 2004 © Tait Electronics Limited...
Page 2: Contact Information
Technical Support: E-mail: canada@taitworld.com E-mail: support@taitworld.com Website: http://support.taitworld.com Tait North Asia Tait Oceania Regional Head Office: Hong Kong Tait Mobile Radio (Hong Kong) Ltd New Zealand E-mail: hongkong@taitworld.com Tait Communications Ltd E-mail: headoffice@tcl.tait.co.nz Beijing Tait Mobile Radio (Hong Kong) Ltd Australia E-mail: beijing@taitworld.com...
Page 3: Limited Warranty
THIS LICENCE WILL BE TERMINATED EXCLUSIVE RIGHT TO USE THE SOFTWARE OR AUTOMATICALLY AND WITHOUT NOTICE FROM FIRMWARE ON A SINGLE MACHINE PROVIDED TAIT IN THE EVENT THAT THE LICENSEE FAILS TO YOU MAY ONLY COMPLY WITH ANY TERM OR CONDITION OF THIS AGREEMENT...
Page 4 FOR ANY TERMS OF AGREEMENT TO THE CONTRARY DIRECT OR CONSEQUENTIAL DAMAGE ARISING BETWEEN TAIT AND THE LICENSEE THIS IS THE OUT OF OR IN CONNECTION WITH ANY USE OR COMPLETE AND EXCLUSIVE STATEMENT OF THE INABILITY OF USING THE SOFTWARE OR...
Page 5: Table Of Contents
Diagnosis of Faults on Main Board ......TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 7: Enquiries And Comments
Technical Support (support@taitworld.com) or to the Technical Support Manager, Tait Electronics Limited, PO Box 1645, Christchurch, New Zealand. Orders for this manual can be placed with your Tait Dealer.
Page 8: Typographical Conventions
Select “Start” > “Programs” > “Tait Programming Applications” > “TM8100 Programming Application” means: Select the “Start” menu, then select the “Programs” option from the list that appears, then the “Tait Programming Applications” option from the second list, and finally the “TM8100 Programming Application”...
Page 9 This alert notice is used to warn about the risk of equipment damage or malfunction. Note This alert notice is used to highlight information that is required to ensure that procedures are performed correctly. TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 10: Associated Documentation
TM8000 3DK hardware developer’s kit — Application manual MMAA30-02-00-429 TM8000 3DK application board — Software programmer’s manual MMAA30-02-00-812 TM8000 3DK application board — Service manual MM8100-00-00-441 TM8100 Computer-controlled data interface — Protocol definition TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 11: Publication Record
First release — includes information for level-1 repairs only 2.00 March 2004 Second release — information for level-2 repairs added 3.00 May 2004 Third release — information for TM8110 radio and D1 band added TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 12: List Of Acronyms
Software Feature Enabler Surface-mount Device Surface-mount Technology SMPS Switch-mode Power Supply Serial Peripheral Interface TCXO Temperature-compensated Crystal Oscillator Tait Electronics Limited User Interface Voltage-controlled Oscillator VCXO Voltage-controlled Crystal Oscillator TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 13: Chapter 1 Description Of Radio
TM8000 mobiles Chapter 1 Description of Radio TM8100 Mobile Radio Service Manual Description of Radio May 2004 © Tait Electronics Limited...
Page 14 3.8 Interface Circuitry ......... Description of Radio TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 15: Introduction
If an internal options board is fitted, there might or might not be an associated external options connector. The auxiliary and external options connectors allow for the connection of various external devices. TM8100 Mobile Radio Service Manual Introduction May 2004 © Tait Electronics Limited...
Page 16 Figure 1.1 Illustrations of the TM8115 radio showing both the front and rear Introduction TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 17 Alternatively, the radio might be needed for desktop use, in which case a desktop power supply is required. Tait desktop power supplies include the parts needed to mount the radio. The user’s guide and accessories manual describe the installation kit.
Page 18 Figure 1.2 Illustration of the front of the TM8105 and TM8110 radios Introduction TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 19 Figure 1.3 Block diagram of an example installation in a vehicle of a radio with a user interface TM8100 Mobile Radio Service Manual Introduction May 2004 © Tait Electronics Limited...
Page 20 Figure 1.4 Block diagram of an example desktop installation of a radio with a user interface Introduction TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 21: Radio Body
The main board, digital board, and heat-transfer block constitute a separate unit called the main-board assembly. Either Tait-designed or custom internal options boards may be fitted in Internal Options Boards the radio body.
Page 22 Figure 1.5 Block diagram of an example installation in a vehicle of a radio with a blank control head Introduction TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 23: Control Head
The space inside the control head can be used for the fitting of an optional third-party circuit board, but is otherwise empty. TM8100 Mobile Radio Service Manual Introduction May 2004 © Tait Electronics Limited...
Page 24 Figure 1.6 Block diagram of the radio body and control head of a radio with a user interface Introduction TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 25: Repair Levels
TEL and ISC ASCs (accredited service centres), the ISC (International Service Centre) and TEL (Tait Electronics Limited) may carry out both level-1 and level-2 repairs. These are moreover the only service centres that may repair a radio that is still under warranty — any repair by a non- accredited service centre will void the warranty.
Page 26: Product Codes
The purpose is solely to enable service technicians to identify the radio body and control head of a radio that has been delivered for repair. Introduction TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 27 The characters ee are applicable to the radio body only and identify different options. The product code scheme is summarised in Figure 1.7. TM8100 Mobile Radio Service Manual Introduction May 2004 © Tait Electronics Limited...
Page 28 AA to ZZ are used. The digits and letters identifying the universal and custom options are assigned sequentially. Figure 1.8 illustrates the product codes in use at the time of publication. Introduction TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 29: Specifications
0 to 9 for b; the latter is set to 0 when no options are added. Both letters and digits may be used for cc. The default for cc is 0T; on one- and two-digit-display control heads the Tait logo is then displayed next to the LCD screen; the product model code TM8110 and TM8115 respectively is displayed above the speaker grille.
Page 30 • Low pressure • High temperature • Low temperature • Temperature shock • Solar radiation • Vibration • Shock • Dust • Rain • Humidity • Salt fog Introduction TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 31 Receive detect time < 3 ms (From the time an RF signal is first present at the antenna to the time when the line changes state) BUSY DETECT TM8100 Mobile Radio Service Manual Introduction May 2004 © Tait Electronics Limited...
Page 33: General Description
RF radiation during transmissions. Regarding the former, the figure clearly shows the cooling fins at the rear and the ridges on the underside, which are provided for heat dissipation. TM8100 Mobile Radio Service Manual General Description May 2004 © Tait Electronics Limited...
Page 34 Figure 2.1 Underside of the radio showing the labels and connectors on the radio body General Description TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 35 2.1. The control head may be attached to the radio body with the underside of the radio body facing either up or down. Which orientation is appropriate depends on the installation. TM8100 Mobile Radio Service Manual General Description May 2004 © Tait Electronics Limited...
Page 36 The potentiometer and connector are mounted on the control-head board inside the front panel. General Description TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 37 The LCD fits in a recess in the front panel. Electrical contact between the LCD and the control-head board is ensured by two elastomeric strips held in place by the space-frame. TM8100 Mobile Radio Service Manual General Description May 2004 © Tait Electronics Limited...
Page 38 Figure 2.4 Interior of a control head with UI showing the space-frame and associated parts CIRCUIT BOARD FOR CONCEALED AND DYNAMIC MICROPHONES (OPTIONAL) General Description TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 39 Figure 2.3 316-06786-xx Front panel Figure 2.3 311-01054-xx Knob for volume-control potentiometer Figure 2.3 312-01095-xx Lens with Tait logo (two-digit display) 312-01106-xx Lens with Tait logo (one-digit display) Figure 2.3 365-01717-xx Label for TM8115 365-01745-xx Label for TM8110 Figure 2.4 219-02882-xx Control-head loom Figure 2.4...
Page 40 Interior of a control head with UI showing the parts remaining after the removal of the space-frame CAPSULE OF CONCEALED MICROPHONE (OPTIONAL) RUBBER SEAL FOR CONCEALED MICROPHONE (OPTIONAL) LIGHT PIPES FOR STATUS LEDs General Description TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 41 The programming connector at one end of the loom is screwed to the front panel. The female-to-female adaptor needed for connection of the other end to the radio body is supplied as part of the loom. TM8100 Mobile Radio Service Manual General Description May 2004 © Tait Electronics Limited...
Page 42 Figure 2.7 Interior of the blank control head General Description TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 43 The lock washer and hexagonal nut are supplied as integral parts of the RF connector. The screws secure the heat-transfer block to the main board. TM8100 Mobile Radio Service Manual General Description May 2004 © Tait Electronics Limited...
Page 44 Figure 2.8 Cover, control-head seal, lid assembly, and chassis assembly of the radio body LID ASSEMBLY CHASSIS ASSEMBLY General Description TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 45 The coated area is shown in both Figure 2.11 Figure 2.12. TM8100 Mobile Radio Service Manual General Description May 2004 © Tait Electronics Limited...
Page 46 Parts of the lid assembly with an internal options board SCREWS FOR SECURING OPTIONS LOOM INTERNAL OPTIONS BOARD TYPICAL LARGE EXTERNAL INTERNAL OPTIONS BOARD OPTIONS CONNECTOR FOAM SEAL COVER SEAL SCREWS LOCK-NUTS General Description TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 47 The contact area on the heat-transfer block is shown in Figure 2.12. TM8100 Mobile Radio Service Manual General Description May 2004 © Tait Electronics Limited...
Page 48 Figure 2.11 Parts of the chassis assembly DIGITAL BOARD HEAT-TRANSFER BLOCK MAIN-BOARD ASSEMBLY MAIN BOARD THERMAL PASTE SCREW BOSS General Description TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 49 Figure 2.12 Parts of the main-board assembly TM8100 Mobile Radio Service Manual General Description May 2004 © Tait Electronics Limited...
Page 50 Figure 2.13 Block diagram of the main board of the radio body General Description TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 51: Architecture Of Radio
Software plays a prominent role in the functioning of the radio. For describing the operation of the radio the software must be included with the above modules. This is considered further below. TM8100 Mobile Radio Service Manual General Description May 2004 © Tait Electronics Limited...
Page 52 Figure 2.14 Architecture of the TM8100 transceiver General Description TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 53: Operation Of Control-Head Circuitry
The internal speaker is connected to the control-head board via a lead with a mating connector so that it can be easily disconnected. TM8100 Mobile Radio Service Manual General Description May 2004 © Tait Electronics Limited...
Page 54: Operation In Receive Mode
2 x (IF1 + 64 kHz). The quadrature output from this mixer is fed to a pair of ADCs (analogue-to-digital converters) with high dynamic range where it is oversampled at 256 kHz and fed to the custom logic device. General Description TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 55 When a wanted signal is present, out-of-band noise content is reduced and, if below the preset threshold, is indicated as a valid wanted signal. TM8100 Mobile Radio Service Manual General Description May 2004 © Tait Electronics Limited...
Page 56 45 dB in 1.5 dB steps. The amplifier performs volume control and muting. The DAC and volume control are part of the same CODEC device (AD6521). General Description TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 57: Operation In Transmit Mode
ALC has a fast-attack (about 10 ms) and slow-decay (up to 2 s) characteristic. This characteristic ensures that the peak signal level is regulated near full scale to maximise dynamic range. TM8100 Mobile Radio Service Manual General Description May 2004 © Tait Electronics Limited...
Page 58 VCO (voltage-controlled oscillator) VCO output switch The RF PLL has fast-locking capability but coarse frequency resolution. The above combination of control loops creates improved frequency generation and acquisition capabilities. General Description TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 59 The modulation cross-over points occur at approximately 30 and 300 Hz as determined by the closed loop bandwidths of the FCL and RF PLL respectively. TM8100 Mobile Radio Service Manual General Description May 2004 © Tait Electronics Limited...
Page 60 FCL nominal frequency; the TCXO frequency itself is not adjusted. The items KVCO and KVCXO are the control sensitivities of the RF VCO (in MHz/V) and VCXO (in kHz/V) respectively. The latter has temperature compensation. General Description TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 61 The PA output power is controlled by varying driver gate bias voltage that has a calibrated maximum limit to prevent overdrive. The power control signal is supplied by a 13-bit DAC driven by custom logic. TM8100 Mobile Radio Service Manual General Description May 2004 © Tait Electronics Limited...
Page 62 For a given power level the look-up table values are scaled by a steady-state power constant so that the ramp waveform shape remains the same for all power levels. General Description TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 63: Circuit Descriptions
LEDs for back-lighting — one for each key and four for the LCD. The four dual switching transistors Q1 to Q4 control the switching of the LEDs; the transistors are driven by IC3. TM8100 Mobile Radio Service Manual Circuit Descriptions May 2004 © Tait Electronics Limited...
Page 64: Transmitter
The exciter operates in full saturation, thereby maintaining a constant output power independent of the varying input power level supplied by the synthesizer (7 to 9 dBm). Circuit Descriptions TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 65: Receiver
The first two IF stages are implemented in hardware; the third stage is implemented in the FPGA (field-programmable gate array) of the digital board. The FPGA also carries out the demodulation of the received signals. TM8100 Mobile Radio Service Manual Circuit Descriptions May 2004 © Tait Electronics Limited...
Page 66 Raw demodulated audio can be tapped out from the DSP for use with an external modem. The modem may be connected to the auxiliary connector or to the external options connector when an internal options board is fitted. Circuit Descriptions TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 67: Frequency Synthesizer
In the following description of the circuitry, first the necessary power supplies and then the synthesizer itself are discussed. The circuitry is given on sheet 5 of the circuit diagram for the main board. TM8100 Mobile Radio Service Manual Circuit Descriptions May 2004 © Tait Electronics Limited...
Page 68 FCL, then the synthesizer output frequency will be wrong. The FCL frequency division is performed by a digital counter inside the PLL IC. The divider setting is constant. Circuit Descriptions TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 69 The resistors and capacitors of the filter affect both the switching time and the stability of the synthesizer; the values of these components have been carefully selected to give optimum control characteristics. TM8100 Mobile Radio Service Manual Circuit Descriptions May 2004 © Tait Electronics Limited...
Page 70: Frequency Control Loop
VCXO. With this design the VCXO frequency can be adjusted by very small precise amounts, and because the loop is locked, the VCXO inherits the temperature stability of the TCXO. Circuit Descriptions TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 71: Codec And Audio Circuitry
The digital section communicates with this CODEC via a three-wire synchronous serial interface ( balls). IC204 also VSFS VSDO VSDI contains voice-band filtering, pre-amplification and volume control. TM8100 Mobile Radio Service Manual Circuit Descriptions May 2004 © Tait Electronics Limited...
Page 72 DIG AUD PA EN consisting of Q200, Q201, R200 to R206, R210 and R250 converts the two digital signals to the single three-level analogue signal required by IC202. Circuit Descriptions TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 73: Power Supply
The power-supply circuitry is given on sheet 6 of the circuit diagram for the main board, and is described below. TM8100 Mobile Radio Service Manual Circuit Descriptions May 2004 © Tait Electronics Limited...
Page 74 The links LK1 to LK4 on the main board are used to implement the desired option. The power-sense options and the link settings are described below. Circuit Descriptions TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 75 The concealed microphone is typically fitted when the emergency power-sense option is selected. TM8100 Mobile Radio Service Manual Circuit Descriptions May 2004 © Tait Electronics Limited...
Page 76: Interface Circuitry
The value of R757 is made large to minimise the loading effect on the 4 only, the optional MOSFET output pull-up resistors. On AUX GPIO Q707, which has a high current drive, may be fitted. Circuit Descriptions TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 77 Q700 will turn on and drive the line high; this indicates ITF CH HOOK either that the microphone is on hook or that the PTT (press-to-talk) switch is pressed. TM8100 Mobile Radio Service Manual Circuit Descriptions May 2004 © Tait Electronics Limited...
Page 79: Chapter 2 Servicing Of Radio
TM8000 mobiles Chapter 2 Servicing of Radio TM8100 Mobile Radio Service Manual Servicing of Radio May 2004 © Tait Electronics Limited...
Page 80 9.7 CODEC and Audio Circuitry ....... . Servicing of Radio TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 81: General Information
TM8100 radios. All ASCs with the necessary endorsements may carry out level- 1 and level-2 repairs of these radios, whether under warranty or not. TM8100 Mobile Radio Service Manual General Information May 2004 © Tait Electronics Limited...
Page 82 Tait-only access Log-in passwords are needed for associate and Tait-only access; Technical Support supplies service centres with the necessary log-in information. (The unsecured portion of the Technical Support website is accessible to the general public.
Page 83 In the service documentation, however, the PCB information pack for only the current release of the board is included. An additional source of information to service centres is the Tait FOCUS Tait FOCUS Database call-logging database. (This is accessible on the Technical Support website also.) All Customer-related technical issues regarding the radios...
Page 84: Tools, Equipment And Spares
Table 4.2 Torque-drivers Drive type Torque (N.m) Torque (lbf.in) Repair level Torx T20 Torx T10 0.56 0.34 3/16-inch socket 0.90 14 mm long-reach socket General Information TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 85 Cable (power connector to banana plugs plus in-line connector) TMAA20-04 Cable (RJ12 socket to RJ45 plug) T2000-A19 Cable (DB9 socket to RJ12 plug) TOPA-SV-024 Test unit MM8100-01-00-812 Service and accessories manuals TM8100 Mobile Radio Service Manual General Information May 2004 © Tait Electronics Limited...
Page 86 Parts of one-digit-display control head — excluding control-head board TMAA22-91 Control-head boards (one-digit display) TMAA22-12B1 Main-board assembly (B1 band) TMAA22-12H5 Main-board assembly (H5 band) TMAA22-12H6 Main-board assembly (H6 band) General Information TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 87: Servicing Precautions
(blank control head only) In addition, ensure that the grommet sealing the aperture to the microphone connector of two-digit-display control heads is properly fitted. TM8100 Mobile Radio Service Manual General Information May 2004 © Tait Electronics Limited...
Page 88 The material of the bench top must satisfy not only anti-static requirements but also the non-scratch requirements mentioned above. General Information TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 89 243 MHz ± 5 kHz, and 406.0 to 406.1 MHz are reserved worldwide for use by distress beacons. Do not program transmitters to operate in any of these frequency bands. TM8100 Mobile Radio Service Manual General Information May 2004 © Tait Electronics Limited...
Page 90 Locations of the capacitors C548 and C565 and the inductors L601 and L602 on the main board VHF BOARD (UHF BOARD SIMILAR) UHF BOARD (VHF BOARD SIMILAR) General Information TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 91: Smt Repair Techniques
Spares kit 5. If this is not done, special precautions are needed when re-installing the original can. These precautions are discussed as part of the training for accreditation. TM8100 Mobile Radio Service Manual General Information May 2004 © Tait Electronics Limited...
Page 92 CONNECTOR RADIO BODY AUXILIARY CONNECTOR RF CONNECTOR POWER CONNECTOR BNC PLUG RJ45 PLUG ADAPTOR BANANA PROGRAMMING PLUGS CONNECTOR BLANK SOCKET CONTROL HEAD DC POWER SUPPLY RADIO BODY General Information TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 93: Equipment Set-Up
(When programming or calibrating radios the switches have no effect, although it is good practice to set the switch to “R ”.) MODE TM8100 Mobile Radio Service Manual General Information May 2004 © Tait Electronics Limited...
Page 94 Figure 4.4 Illustration of the face of the test unit General Information TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 95 Click “Start” > “Run”. The “Run” dialogue box appears. Type d:\menu.exe, where d is the letter designating the CD-ROM drive. Click the “OK” button. The “Run” dialogue box is closed and the Contents window appears. TM8100 Mobile Radio Service Manual General Information May 2004 © Tait Electronics Limited...
Page 96 Investigate the remaining features of the product support CD as described below, or click the Close button to remove the window. Remove and store the product support CD. General Information TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 97 To run the application and become familiar with its features, proceed as follows: Click “Start” > “Programs” > “Tait Programming Applications” > “TM8100 Programming Application”. The programming application is opened.
Page 98 To run the application and become familiar with its features, proceed as follows: Click “Start” > “Programs” > “Tait Programming Applications” > “TM8100 Calibration Application”. The calibration application is opened.
Page 99 (r1, r2, r3, r4, r5, t1, t2, t3 or t7) AUD TAP OUT and y the tap type (C=bypass out, D=split, E=splice) (the default is D when y is omitted) TM8100 Mobile Radio Service Manual General Information May 2004 © Tait Electronics Limited...
Page 100 204 – Read system error SysErr: x Reads the last recorded system error and the associated data where x is the error number and y represents the associated data General Information TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 101 378 – Receiver output level Reads the signal power at the where x is the signal power output of the channel filter (the square of the amplitude) TM8100 Mobile Radio Service Manual General Information May 2004 © Tait Electronics Limited...
Page 102 (a value from 0 to 1100 mV) 326 – Transmitter power 326 x None Sets the power level of the where x specifies the level transmitter (0=off, 1=very low, 2=low, 3=medium, 4=high, 5=maximum) General Information TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 103 4.9. Depending on the command, a response might or might not be displayed. If an error occurs, an error code will be displayed. Possible error codes are listed in Table 4.10. TM8100 Mobile Radio Service Manual General Information May 2004 © Tait Electronics Limited...
Page 104 The information conveyed by the tones is given in Table 4.12. Not all of the tones listed are relevant to the servicing of radios but they are included for the sake of completeness. General Information TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 105 Continuous low-pitched While powered up — System error has occurred and radio might be inoperable; tone LCD usually displays E1 or E2 (two-digit display) or E (one-digit display) TM8100 Mobile Radio Service Manual General Information May 2004 © Tait Electronics Limited...
Page 107: Servicing Procedure
Spares kit 1 or 10. The contents of the kit are listed in Table 6.1 Section 6 (on page 125). Push the replacement knob onto the shaft of the volume-control potentiometer. Ensure that the knob turns freely. TM8100 Mobile Radio Service Manual Servicing Procedure May 2004 © Tait Electronics Limited...
Page 108 Spares kit 10 (one-digit-display control head). Then re-assemble the control head and re-attach it to the radio body as described in Subsection 6.5 (on page 148). Servicing Procedure TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 109: Fault Diagnosis And Repair
If the main-board assembly was replaced or if the repair failed, re- assemble the radio as described in Subsection 6.4 (on page 144) Subsection 6.5 (on page 148). Conclude with the tasks of Subsection 5.3 (on page 121). TM8100 Mobile Radio Service Manual Servicing Procedure May 2004 © Tait Electronics Limited...
Page 110 Return to Step 3 of Task 1. Figure 5.1 Chart for locating and rectifying faults that affect power up Servicing Procedure TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 111 First cycling the power is essential if the radio is programmed to power up in transparent-data mode (both 1200 baud FFSK and Tait high-speed data) and if the selected data port is the microphone connector (control head with UI) or programming connector (blank control head).
Page 112 Return to Step 4 of Task 2. Figure 5.2 Chart for locating and rectifying faults that affect the reading of the programming file Servicing Procedure TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 113 If the reported fault concerns powering up the radio or reading the programming file, and this has not been confirmed, obtain more information from the Customer. TM8100 Mobile Radio Service Manual Servicing Procedure May 2004 © Tait Electronics Limited...
Page 114 If the reported fault concerns the user interface — and this has not been confirmed — obtain more information from the Customer. If the reported fault is unspecific, proceed to Task 6. Servicing Procedure TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 115 If the reported fault concerns the receive function — and this has not been confirmed — obtain more information from the Customer. If the reported fault is unspecific, proceed to Task 7. TM8100 Mobile Radio Service Manual Servicing Procedure May 2004 © Tait Electronics Limited...
Page 116 Step 4 of Task 6. Figure 5.3 Chart for locating and rectifying faults that affect the receive function — control head is faulty Servicing Procedure TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 117 Return to Step 4 of Task 6. Figure 5.4 Chart for locating and rectifying faults that affect the receive function — radio body is faulty TM8100 Mobile Radio Service Manual Servicing Procedure May 2004 © Tait Electronics Limited...
Page 118 Customer. If the reported fault is unspecific, and no fault could be found with the radio, also obtain more information. Otherwise re-assemble the radio, if necessary, and conclude with the tasks of Subsection 5.3. Servicing Procedure TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 119 Step 4 of Task 7. Figure 5.5 Chart for locating and rectifying faults that affect the transmit function — control head is faulty TM8100 Mobile Radio Service Manual Servicing Procedure May 2004 © Tait Electronics Limited...
Page 120 Return to Step 4 of Task 7. Figure 5.6 Chart for locating and rectifying faults that affect the transmit function — radio body is faulty Servicing Procedure TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 121: Final Inspection, Test And Administration
Customer with confirmation of the repair. With TM8100 radios, however, additional tasks are necessary if: faulty control-head board or main-board assembly is replaced default programming file is used These additional tasks are discussed further below. TM8100 Mobile Radio Service Manual Servicing Procedure May 2004 © Tait Electronics Limited...
Page 122 If the radio is to be returned to a Dealer or direct to a Customer who does have programming facilities, the Dealer or Customer respectively need to be informed so that they can program the radio appropriately. Servicing Procedure TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 123 Check operation of microphone Check operation of hook-switch Data communications Test 1200 baud data transmission (standard) Test Tait high-speed data transmission (if feature is enabled) Direct-connect GPS Check that GPS poll returns correct position (if feature is enabled) (global positioning system)
Page 125: Disassembly And Re-Assembly Of Radio
However, these procedures can also be followed independently to disassemble and re-assemble the radio. TM8100 Mobile Radio Service Manual Disassembly and Re-assembly of Radio May 2004 © Tait Electronics Limited...
Page 126 Figure 6.1 Lever points for detaching the control head from the radio body Disassembly and Re-assembly of Radio TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 127: Detachment Of Control Head
After detaching the control head, disconnect the control-head loom at the connector on the radio body. Refer to Figure 6.2. Inspect the control head and loom as described below. TM8100 Mobile Radio Service Manual Disassembly and Re-assembly of Radio May 2004 © Tait Electronics Limited...
Page 128 Details of the control-head seal between the radio body and control head RADIO BODY CONTROL-HEAD LOOM CONTROL-HEAD SEAL SEAL SEAL LIPS CONTROL HEAD FRONT FACE OF RADIO BODY DETAILS OF CONTROL-HEAD SEAL Disassembly and Re-assembly of Radio TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 129 If there is damage in a blank control head, replace the complete control head; for the relevant product code refer to Subsection 1.5 (on page 26). TM8100 Mobile Radio Service Manual Disassembly and Re-assembly of Radio May 2004 © Tait Electronics Limited...
Page 130 Figure 6.3 Plan view of the control head showing the control-head board Disassembly and Re-assembly of Radio TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 131: Disassembly Of Control Head
Subsection 5.2 (on page 109). If there is damage, continue with the disassembly of the control head and rectify the damage as described below. TM8100 Mobile Radio Service Manual Disassembly and Re-assembly of Radio May 2004 © Tait Electronics Limited...
Page 132 3 x 8 PT screw for control-head board Figure 2.4 Parts of front-panel assembly 316-06786-xx Front panel Figure 2.3 312-01095-xx Lens with Tait logo (two-digit display) Figure 2.3 312-01106-xx Lens with Tait logo (one-digit display) 365-01717-xx Label for TM8115 Figure 2.3...
Page 133 109). Later in the repair procedure the control head board will be fitted to the new front-panel assembly and the complete control head will be assembled. TM8100 Mobile Radio Service Manual Disassembly and Re-assembly of Radio May 2004 © Tait Electronics Limited...
Page 134 Figure 6.4 Plan view of the control head with the control-head board removed Disassembly and Re-assembly of Radio TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 135 LED light pipes are moulded into the panel. If any part of the front panel is damaged, including the membrane, lens and light pipes, replace the complete panel. TM8100 Mobile Radio Service Manual Disassembly and Re-assembly of Radio May 2004 © Tait Electronics Limited...
Page 136 Figure 6.5 Lever points for removing the cover of the radio body UPPER SCREW BOSS LEVER POINT LOWER DETAILS OF SCREW LEVER POINT BOSS Disassembly and Re-assembly of Radio TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 137: Disassembly Of Radio Body
IPN. The latest issue of a particular part is always supplied. Continue with the servicing procedure detailed in Subsection 5.2 (on page 109). TM8100 Mobile Radio Service Manual Disassembly and Re-assembly of Radio May 2004 © Tait Electronics Limited...
Page 138 The four screws that secure the lid to the chassis of the radio body COVER SEAL FOR EXTERNAL OPTIONS CONNECTOR BUNG FOR AUXILIARY CONNECTOR CHASSIS Disassembly and Re-assembly of Radio TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 139 Figure 6.7 Illustration of the lid removed from the chassis of the radio body, with an options board installed in the lid TM8100 Mobile Radio Service Manual Disassembly and Re-assembly of Radio May 2004 © Tait Electronics Limited...
Page 140: Rear View
SCREW 1 PAD TOP PAF TOP CAN MAIN BOARD HEAT-TRANSFER BLOCK REAR VIEW BUNG FOR SEAL FOR AUXILIARY CONNECTOR SCREW 6 SCREW 7 RF CONNECTOR Disassembly and Re-assembly of Radio TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 141 Grip the edge of the board and pull out the assembly, but avoid the thermal paste on the heat-transfer block and PCB underside. The areas coated with thermal paste are shown in Figure 2.11 Figure 6.9. TM8100 Mobile Radio Service Manual Disassembly and Re-assembly of Radio May 2004 © Tait Electronics Limited...
Page 142 Access to the screws is via the holes in the cans PAD TOP PAF TOP shown in Figure 6.8. Disassembly and Re-assembly of Radio TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 143 After replacing the connector, use a torque- driver to tighten the screws to 0.34 N m (3 lbf in). · · TM8100 Mobile Radio Service Manual Disassembly and Re-assembly of Radio May 2004 © Tait Electronics Limited...
Page 144: Re-Assembly Of Radio Body
· · Fit the rubber seal for the power connector. There is only one correct orientation. Ensure that the seal is properly seated. Disassembly and Re-assembly of Radio TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 145 Replenish the paste on the screw boss as described in Steps 3 and 4. The amount of paste required is about one-tenth of that used for the heat-transfer block. TM8100 Mobile Radio Service Manual Disassembly and Re-assembly of Radio May 2004 © Tait Electronics Limited...
Page 146 In fitting the bung, ensure that it is not upside down and that it is properly seated. Disassembly and Re-assembly of Radio TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 147 (22 lbf in). · · Fit the cover of the radio body. Continue with the servicing procedure detailed in Subsection 5.2 (on page 109). TM8100 Mobile Radio Service Manual Disassembly and Re-assembly of Radio May 2004 © Tait Electronics Limited...
Page 148: Re-Assembly And Attachment Of Control Head
Wipe the strips with a soft lens-cleaning cloth. If necessary, clean the strips using isopropyl alcohol. Insert the two elastomeric strips in their slots in the space-frame. Disassembly and Re-assembly of Radio TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 149 Orient the plug on the leads so that the ridge on one side of the plug is uppermost. Push the knob onto the shaft of the volume-control potentiometer. Ensure that the knob turns freely. TM8100 Mobile Radio Service Manual Disassembly and Re-assembly of Radio May 2004 © Tait Electronics Limited...
Page 150 Press the control head against the radio body until it clips into position. Ensure that the seal is not damaged in the process. Continue with the servicing procedure detailed in Subsection 5.2 (on page 109). Disassembly and Re-assembly of Radio TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 151: Servicing Of Control Head
2 deal with the case where the board is not the cause. The remaining three faults also do not involve the board, and these are dealt with in Tasks 3 to 5 respectively. TM8100 Mobile Radio Service Manual Servicing of Control Head May 2004 © Tait Electronics Limited...
Page 152 Figure 7.1 Primary side of the control-head board Servicing of Control Head TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 153 Subsection 7.4 (on page 163). Level-2 service centres should attempt to repair the board as described in Subsection 7.2 (on page 157). TM8100 Mobile Radio Service Manual Servicing of Control Head May 2004 © Tait Electronics Limited...
Page 154 Figure 7.2 Secondary side of the control-head board with the LCD driver circuitry and other components indicated Servicing of Control Head TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 155 Task 5. Reconnect the control-head loom, test the speaker to confirm the removal of the fault, and return to Subsection 5.2. TM8100 Mobile Radio Service Manual Servicing of Control Head May 2004 © Tait Electronics Limited...
Page 156 Figure 7.3 Secondary side of the control-head board with IC3, IC5, IC7 and the switching transistors for the LEDs indicated Servicing of Control Head TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 157: Faults Involving Control-Head Board
Subsection 7.1 (on page 151). The repair procedures are given below in Tasks 1 to 5 respectively. For obtaining replacement components, refer to Subsection 7.3 (on page 160). TM8100 Mobile Radio Service Manual Servicing of Control Head May 2004 © Tait Electronics Limited...
Page 158 Subsection 6.5 (on page 148), and return to Subsection 5.2. If it has not, the repair failed; replace the control-head board as described in Subsection 7.4. Servicing of Control Head TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 159 Confirm the removal of the fault, and return to Subsection 5.2. If the repair failed or no fault could be found, replace the control- head board as described in Subsection 7.4. TM8100 Mobile Radio Service Manual Servicing of Control Head May 2004 © Tait Electronics Limited...
Page 160: Replacement Of Faulty Component
Obtain the PCB information pack for the board under repair. If a copy is not available, refer to the Technical Support website as described in the next paragraph. Servicing of Control Head TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 161 Click the “Login” button. The Log-in dialogue box appears. Enter the required log-in information in the “Username” and “Password” fields. (Tait-only access is required.) Click the “Login” button. Click the “Mobile Radios — TM8000” option. A list of facilities for this product family appears.
Page 162 TEL. Always ensure that the replacement component has the identical specification to that given in the BOM. It is particularly important for the tolerances to be the same. Servicing of Control Head TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 163: Replacement Of Faulty Control-Head Board
If there is still a fault, the repair failed; remove the spare board, re-assemble the control head with the original board, and return to Subsection 5.2. TM8100 Mobile Radio Service Manual Servicing of Control Head May 2004 © Tait Electronics Limited...
Page 165: Servicing Of Main Board
Similarly, if there is a problem with the radio firmware, reprogram the radio before continuing. (Use a default programming file if necessary.) TM8100 Mobile Radio Service Manual Servicing of Main Board May 2004 © Tait Electronics Limited...
Page 166: Replacement Of Faulty Component
BOM of PCB information pack consult technical notes obtain replacement component The technical notes will indicate whether there have been any changes affecting the component in question. Servicing of Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 167 Click the “Login” button. The Log-in dialogue box appears. Enter the required log-in information in the “Username” and “Password” fields. (Tait-only access is required.) Click the “Login” button. Click the “Mobile Radios — TM8000” option. A list of facilities for this product family appears.
Page 168 TEL. Always ensure that the replacement component has the identical specification to that given in the BOM. It is particularly important for the tolerances to be the same. Servicing of Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 169: Replacement Of Faulty Main-Board Assembly
If the tests do not confirm the proper functioning of the radio, the repair failed; remove the spare assembly, re-assemble the radio with the original assembly, and return to Subsection 5.2. TM8100 Mobile Radio Service Manual Servicing of Main Board May 2004 © Tait Electronics Limited...
Page 170 The procedure is given in the on-line help facility under the heading “Enabling a feature”. Then return to Subsection 5.2 continue with the servicing of the radio. Servicing of Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 171: Diagnosis Of Faults On Main Board
With the first type of fault, carry out Tasks 1 to 3. With the second type of fault, carry out Task 4. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 172 Figure 9.1 Important components of the power-supply circuitry on the bottom-side of the main board PIN 7 PIN 5 CAN FOR DIGITAL BOARD Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 173 2.0 V DC while the key is depressed. If it does, go to Task 2. If it does not, the repair failed; return to Subsection 8.1 and replace the complete main-board assembly. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 174 Subsection 8.1 and replace the complete main-board assembly. If the voltage is not correct, go to Step 2. Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 175 If the radio powers up, return to Subsection 8.1. If the radio fails to power up, the repair failed; return to Subsection 8.1 and replace the complete main-board assembly. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 176 Subsection 8.1. If the repair failed, return to Subsection 8.1 and replace the complete main-board assembly. Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 177 D604 [at 6C4/6C3] (see Figure 9.1) and pin 15 of the internal options connector. Repair any fault and return to Subsection 8.1. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 178: Interface Circuitry
9.4, which shows part of the internal options 7 is a connector signal and connector as an example, IOP GPIO ITF IOP GPIO is an internal signal. Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 179 These figures show the three areas of the main board where the components of the interface circuitry are situated. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 180 Confirm the removal of the fault and return to Subsection 8.1. If the fault could not be found, return to Subsection 8.1 and replace the complete main-board assembly. Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 181 If the voltages given in Steps 4 and 5 are observed, go to Step 7. If they are not, go to Step 8. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 182 Figure 9.7 Components of the interface circuitry on the bottom-side of the main board CAN FOR DIGITAL BOARD Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 183: Frequency Synthesizer
If the lock status is 011 or 010 in receive mode or 010 in transmit mode, the synthesizer is suspect; proceed to Task 1. (If the status is 010 in receive mode, investigate the receiver later also.) TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 184 Figure 9.8 Synthesizer circuitry under the can on the top-side of the main board FCL TOP SYN TOP CAN Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 185 Subsection 8.1. If the repair failed, return to Subsection 8.1 and replace the complete main-board assembly. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 186 Figure 9.9 Synthesizer circuitry under the cans on the top-side of the main SYN TOP VCO TOP board UHF BOARD VHF BOARD Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 187 If there is unexpected modulation or noise, go to Task 3. If the voltages are not correct, go to Task 4. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 188 Figure 9.10 Synthesizer circuitry under the cans on the bottom-side of the main SYN BOT VCO BOT board UHF BOARD VHF BOARD Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 189 Subsection 8.1. If the repair failed or the fault could not be found, return to Subsection 8.1 and replace the complete main-board assembly. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 190 Subsection 8.1. If the repair failed, return to Subsection 8.1 and replace the complete main-board assembly. Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 191: Frequency Control Loop
9.5). Confirm the removal of the fault and go to Task 2. If the repair failed, return to Subsection 8.1 and replace the complete main-board assembly. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 192 FCL circuitry under and adjacent the FCL TOP VIA BETWEEN C536 AND R357 POSITION IN WHICH TO PLACE R527 FOR FAULT-DIAGNOSIS PURPOSES WHEN LOOP OSCILLATES Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 193 . If a CDC VCXO MOD triangular wave is present, the loop is oscillating; go to Task 4. Otherwise go to Task 3. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 194 1.5 V DC, go to Step 5. If the voltage levels are all correct (following earlier repairs), the fault has been removed; return to Subsection 8.1. Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 195 Replace all cans. Repeat Steps 1 to 3 to confirm the removal of the fault. If the repair failed, return to Subsection 8.1 and replace the complete main-board assembly. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 196 9.11. Replace all cans. Repeat Steps 1 to 3 of Task 3 to confirm the removal of the fault. If the repair failed, return to Subsection 8.1 and replace the complete main-board assembly. Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 197: Receiver
< 40 000, go to Task 3 (sensitivity is about 15 dB too low) x < 500 000, go to Task 4 (sensitivity is a few decibels too low) TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 198 Figure 9.13 Receiver circuitry under the IF TOP Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 199 If there is no fault, go to Step 6. If there is, repair the fault and go to Step 7. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 200 Figure 9.14 Receiver circuitry under the Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 201 Recalibrate the receiver using the calibration application. Confirm the removal of the fault and return to Subsection 8.1. If the repair failed, go to Task 4. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 202 176 ± 15 210 ± 15 DAC value 0.48 ± 0.24 1.07 ± 0.18 1.58 ± 0.18 2.07 ± 0.18 2.47 ± 0.18 Voltage (V) Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 203 2050 ± 40 1870 ± 40 H6 frequency band Receiver input power (dBm) Standard radio –68 –60 –50 –62 –54 –44 Trigger-base radio TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 204 In this case all the RSSI calibration settings are correct, but there is still an RSSI fault; go to Task 1 and check the receiver sensitivity. Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 205 If it has, return to Subsection 8.1. If it has not, go to Task 5 and check the RSSI calibration. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 206 Minimum noise value Maximum noise value 1900 2300 Narrow (12.5 kHz) 3700 4200 Medium (20 kHz) 1000 1500 5500 7300 Wide (25 kHz) 2200 3700 Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 207 Subsection 8.1. If the repair failed or the fault could not be found, return to Subsection 8.1 and replace the complete main-board assembly. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 208: Transmitter
The reason for this is that the transmit timers do not function in CCTM mode. Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 209 If the reverse power is momentarily too high, the directional coupler, PIN switch or LPF is suspect; go to Task 11. Otherwise go to Task 3. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 210 Reverse power (319 command) 1200 to 1900 < 500 1700 to 2400 < 700 2600 to 3400 < 1000 2900 to 3800 < 1000 Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 211 If the radio draws some current but there is no power output at the antenna, go to Task 11. If no current is drawn, go to Task 4. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 212 Subsection 8.1. If the repair failed, return to Subsection 8.1 and replace the complete main- board assembly. Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 213 304 1 114 1023 334 0 335 0 Note the current reading on the DC power supply. This will be about 300 mA. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 214 PA circuitry under the can (B1, H5 and H6 bands) PAF TOP B1 BAND MEASUREMENT POINT ON L310 (B1 BAND SIMILAR) H5, H6 BANDS Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 215 9.17). If a fault is found, repair it, confirm the removal of the fault, and return to Subsection 8.1. If the repair failed, return Subsection 8.1 and replace the complete main-board assembly. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 216 Figure 9.19 PA circuitry under the can (D1 band) PAF TOP MEASUREMENT POINT ON L310 PAF TOP Q310 Q309 D301 D1 BAND Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 217 C310, R324, R327 MEASUREMENT POINT ON L306 EXCITER OUTPUT AT C301 DRIVER OUTPUT H5, H6 BANDS BUFFER OUTPUT AT C313 SYNTHESIZER OUTPUT AT C300 TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 218 C317 R324 C310 C389 Q306 PAD TOP EXCITER OUTPUT AT C301 Q303 C300 D1 BAND BUFFER OUTPUT AT C313 SYNTHESIZER OUTPUT AT C300 Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 219 9.17). If a fault is found, repair it, confirm the removal of the fault, and return to Subsection 8.1. If the repair failed, return Subsection 8.1 and replace the complete main-board assembly. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 220 4.0 ± 0.1 3.9 ± 0.1 3.9 ± 0.1 3.8 ± 0.1 4.2 ± 0.1 4.1 ± 0.1 4.7 ± 0.1 4.6 ± 0.1 Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 221 2.4 ± 0.1 V. If it does, go to Task 9. If it does not, go to Subsection 9.7 on the CODEC and audio circuitry. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 222 Components of concern on the bottom-side of the main board (B1, H5 and H6 bands) COPPER BLOCK VCO BOT CAN NB BOT CAN B1 BAND COPPER BLOCK VCO BOT CAN H5, H6 BANDS Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 223 Q306. Confirm the removal of the fault and return to Subsection 8.1. If the repair failed, return to Subsection 8.1 replace the complete main-board assembly. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 224 Figure 9.24 Components of concern on the bottom-side of the main board (D1 band) COPPER BLOCK VCO BOT CAN R3009 R396 R340 C345 R3000 Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 225 Components of the interstage matching circuitry between the PA driver Q306 and the PAs Q309 and Q310 (B1, H5 and H6 bands) B1 BAND PAF TOP CAN PAD TOP CAN H5, H6 BANDS TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 226 0.2 ± 0.1 0.4 ± 0.1 2.5 ± 0.5 5.5 ± 0.5 0.3 ± 0.1 0.3 ± 0.1 2.5 ± 0.5 7.7 ± 0.5 Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 227 0.2 ± 0.1 0.3 ± 0.1 3.6 ± 0.5 8.2 ± 0.5 0.2 ± 0.1 0.3 ± 0.1 3.2 ± 0.5 2.5 ± 0.5 TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 228 Q306. Confirm the removal of the fault and return to Subsection 8.1. If the repair failed, return to Subsection 8.1 and replace the complete main-board assembly. Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 229 Subsection 8.1. If the repair had failed, replace the complete main-board assembly. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 230 (B1, H5 and H6 bands) TEST PAD MOUNTING POINT FOR TEST CAPACITOR TEST PAD MEASUREMENT POINT ON L315 H5, H6 BANDS B1 BAND Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 231 (D1 band) MOUNTING POINT FOR TEST CAPACITOR TEST PAD DIRC MEASUREMENT POINT ON L315 L315 D1 BAND TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 232 TEST PAD MOUNTING POINT FOR TEST CAPACITOR H5, H6 BANDS B1 BAND PIN TOP TEST PAD MOUNTING POINT FOR TEST CAPACITOR D307 D1 BAND Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 233 35 W. If it does, the fault has been rectified; return to Subsection 8.1. If it does not, the repair failed; return to Subsection 8.1 and replace the complete main-board assembly. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 234 Task 12. Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 235 5 ± 5 W 12 ± 5 W 27 ± 5 W 13 ± 5 W 19 ± 5 W 28 ± 5 W TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 236: Codec And Audio Circuitry
Vary the volume control. This should cause the signal level at the 200 test point to vary. If it does, go to Step 3. If it does not, go to Step 7. Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 237 Subsection 8.1. If the repair failed or the fault could not be found, return to Subsection 8.1 and replace the complete main-board assembly. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 238 Subsection 8.1. If the repair failed or the fault could not be found, return to Subsection 8.1 and replace the complete main-board assembly. Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 239 IC204 is faulty; return to Subsection 8.1 and replace the complete main-board assembly. If a sine wave is not present, go to Subsection 9.5 on the receiver. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 240 Figure 9.31 Circuitry under the can, adjacent interface circuitry, and the 503 test CDC TOP points Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 241 Subsection 8.1. If the repair failed or the fault could not be found, return to Subsection 8.1 and replace the complete main-board assembly. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 242 Figure 9.32 Circuitry under the CDC BOT CDC AUD TAP OUT JUNCTION OF R218 AND IC204 LO2 BOT CAN CAN FOR DIGITAL BOARD Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...
Page 243 Subsection 8.1. If the repair failed or the fault could not be found, return to Subsection 8.1 and replace the complete main-board assembly. TM8100 Mobile Radio Service Manual Diagnosis of Faults on Main Board May 2004 © Tait Electronics Limited...
Page 244 9.31). Confirm the removal of the fault and return to Subsection 8.1. If the repair failed, return to Subsection 8.1 and replace the complete main-board assembly. Diagnosis of Faults on Main Board TM8100 Mobile Radio Service Manual May 2004 © Tait Electronics Limited...

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