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42

Reciter Circuit Description

TB8100 Service Manual

© Tait Electronics Limited September 2006

2.4

Receiver RF Circuitry - UHF Reciter

2.4.1

Front End

H-Band Reciter

The incoming signal from the BNC connector is fed through a triplet helical 
filter, followed by a simple low pass network which attenuates harmonics 
and spurious responses from the preceding filter.  The signal is then 
amplified and passed through a low pass filter which provides immunity to 
interference from higher frequency out-of-band signals.  Automatic gain 
control (AGC) is provided at this point by a PIN diode attenuator.  The 
signal is now amplified again in a second RF amplifier, and is then fed 
through a band pass filter and attenuator pad to the mixer.

Figure 2.7

Reciter UHF receiver RF circuitry block diagram

Attenuator

Pad

RF

Amplifier

Low Pass

Filter

Low Pass

Filter

High Pass

Filter

SAW
Filter

SAW
Filter

SAW
Filter

SAW
Filter

Switch

Switch

Switch

Switch

Attenuator

Pad

Mixer

Local Oscillator

Diplexer

Post-mixer

Buffer

Crystal

Filter

IF

Amplifier

Anti-alias

Filter

IF Output

RF In

Attenuator

Pad

Band Pass

Filter 1

Band Pass

Filter 2

RF

Amplifier 1

RF

Amplifier 2

Low Pass

Filter

PIN

Attenuator

AGC not fitted to
K band reciters

Attenuator

Pad

AGC Control

AGC Detector

Mixer

Local Oscillator

Diplexer

Post-mixer

Buffer

Crystal

Filter

IF

Amplifier

Anti-alias

Filter

IF Output

RF In

H and K Bands

L Band

Summary of Contents for TB8100

Page 1: ...TB8100 base station Service Manual MBA 00016 02 Issue 2 September 2006...

Page 2: ...pplicable jurisdictions Enquiries and Comments If you have any enquiries regarding this manual or any comments suggestions and notifications of errors please contact Technical Support Updates of Manua...

Page 3: ...3 Unauthorised Modifications 18 1 4 General Servicing Information 19 1 4 1 Repair Levels 19 1 4 2 Accreditation of Service Centres 19 1 4 3 Skills and Resources for Level 1 Repairs 19 1 4 4 Skills and...

Page 4: ...3 2 4 4 Synthesizer 43 2 4 5 VCO 44 2 4 6 AGC H Band Only 46 2 5 Exciter RF Circuitry 47 2 5 1 Frequency Control Loop 47 2 5 2 Synthesizer 48 2 5 3 VCO VHF Reciter 51 2 5 4 VCO UHF Reciter 52 2 5 5 Ex...

Page 5: ...7 1 9 Ambient Air Temperature Sensor 120 7 2 RF Circuitry 120 7 2 1 6W Board 120 7 2 2 60W Board 120 7 2 3 Low Pass Filter and Directional Coupler Board 121 7 2 4 Splitter and Combiner Boards 121 7 2...

Page 6: ...d 188 10 7 Replacing the Splitter Combiner Boards 190 10 8 Replacing the Interconnect Boards 192 10 9 Replacing the Boost Regulator Board in a 12V PA 193 11 Power Amplifier Spare Parts 195 12 Power Ma...

Page 7: ...Modules 254 14 8 Refitting the Front and Rear Panels 257 14 9 Refitting the Top and Bottom Covers 258 15 Power Management Unit Card and Board Replacement 259 15 1 Safety Precautions 259 15 1 1 Persona...

Page 8: ...8 TB8100 Service Manual Tait Electronics Limited September 2006 19 Subrack Servicing 287 Glossary 295...

Page 9: ...50 Figure 2 12 Reciter system interface board block diagram 56 Figure 2 13 Reciter power supply block diagram 60 Figure 2 14 Identifying the circuitry on the digital and system interface boards 61 Fi...

Page 10: ...0 Figure 8 13 Location of test points on the 60W board 162 Figure 8 14 Location of the test points and input coupling components on the LPF directional coupler board 166 Figure 8 15 Test equipment set...

Page 11: ...sassembly and Reassembly Figure 14 1 Removing the front and rear panels 253 Figure 14 2 Disconnecting the AC and DC modules 255 Figure 14 3 Reconnecting the AC and DC modules 256 Power Management Unit...

Page 12: ...Consult your nearest Tait Dealer or Customer Service Organisation for more information Document Conventions File Open means click File on the menu bar then click Open on the list of commands that pops...

Page 13: ...00 Calibration Kit User s Manual MB8100 80 00 806 TB8100 Alarm Center User s Manual MBA 00013 xx TBA0STU TBA0STP Calibration and Test Unit Operation Manual The characters xx represent the issue number...

Page 14: ...citer PA and PMU information added for the following frequency bands B C H4 K and L information added for the following products 12V PA multi reciter subrack and control panel TaitNet Ethernet and Tai...

Page 15: ...for the internal voltages to self discharge before dismantling The AC power on off switch does not isolate the PMU from the mains It breaks only the phase circuit not the neutral The DC power on off s...

Page 16: ...s You should safely dispose of all used or obsolete components accord ing to your local regulations 1 1 4 Proximity to RF Transmissions Do not operate the transmitter when someone is standing within 9...

Page 17: ...precautions and the dangers of electrostatic discharge ESD from standards such as ANSI ESD S20 20 1999 or BS EN 100015 4 1994 The Electrostactic Discharge Association website is http www esda org 1 2...

Page 18: ...ance1 This device complies with part 15 of the FCC Rules Operation is subject to the condition that this device does not cause harmful interference 1 3 3 Unauthorised Modifications Any modifications y...

Page 19: ...nics Limited personnel allow their service facilities to be assessed and provide adequate documentation of their processes They will be accorded ASC status and endorsed for repairs of TB8100 equipment...

Page 20: ...nformation The unsecured portion of the Technical Support website is accessible to the general public This type of access is called public access and no log in password is required 1 4 6 Items Availab...

Page 21: ...outs and circuit diagrams Contact your nearest Customer Service Organisation for more details on the availability of PCB information refer to Contact Information on page 2 1 4 8 Tait FOCUS Database An...

Page 22: ...e 15 1 on page 263 for remov ing the plug in cards in the PMU The card remover is included in the TBA0ST2 tool kit and is also available sep arately as part number 220 02034 01 Driver Spanner Size Loc...

Page 23: ...o secure the RF power transistors in the TB8100 power amplifier and cannot be interchanged with M3 screws refer to Figure 11 1 on page 197 1 6 3 Pozidriv Recess Head Screws Pozidriv recess head screws...

Page 24: ...in differences between typical Pozidriv and Phillips screw heads and screwdriver tips actual hardware may differ slightly from these illustrations due to variations in manufacturing techniques Figure...

Page 25: ...you are doing any work on the PCB that involves removing or fitting components you must take care not to damage the copper tracks or pads The two satisfactory methods of removing components from plate...

Page 26: ...by drawing it out from the component side do not use undue force 2 Fill the hole with solder and then clear with solderwick 1 7 3 Cased Mica Capacitors Cased mica capacitors can be removed by heating...

Page 27: ...an optional system interface board These boards are mounted on a central chassis heatsink Figure 2 1 on page 28 shows the configuration of the main circuit blocks and the main inputs and outputs for p...

Page 28: ...m Reference Frequency Subsystem Digital Receiver Power Supply Power Supply RISC DSP RISC CODECs IF 12 8MHz Ref RF I P 28VDC I P 28V 28V 5V 3 3V 8 5V RF O P PA Key Audio System Control Bus System I O D...

Page 29: ...tal signal processor DSP for demodulation The digital channel filtering also decimates the sample rate down to 50kSPS kilosamples per second for the DSP UHF Reciter The heart of the digital IF system...

Page 30: ...asis and low pass filtering signal path switching signal level adjustment peak FM deviation limiting FM signal generation by controlling the dual point modulator calibration parameter estimation line...

Page 31: ...Audio DC Measurement Noise Mute serial port Interface RISC DSP RISC serial port CODECs Signal Conditioning serial port CODECs Signal Conditioning serial port Tx VCO Tx Synthesiser Tx VCXO RF Frequency...

Page 32: ...ine VCXO voltage control line balanced line output unbalanced line output speaker output RSSI voltage indicator 2 1 3 Reduced Instruction Set Computer RISC Refer to Figure 2 3 on page 33 Hardware and...

Page 33: ...subrack Figure 2 3 Reciter RISC functional block diagram Reciter Status External Reference Detect Select RISC 40MHz Clock Synthesizers Flash RAM DSP System Control Bus System Interface Board Interrupt...

Page 34: ...synthesizer exciter synthesizer The RISC communicates with the control panel via I2 C bus to read the button states read the microphone PTT state control the LEDs turn the speaker amplifier on and of...

Page 35: ...e rear panel The synthesizer uses a phase locked loop to lock the 12 8MHz VCXO to the external reference frequency The synthesizer IC receives the divider and control information from the RISC process...

Page 36: ...l has a high logic level when the externally supplied signal has the correct level Hardware Switch The hardware switch is implemented using a discrete dual transistor pair When the switch is off defau...

Page 37: ...f ref f VCOfb Software Register External Reference Detector Lock Detect RISC 8 9 Prescaler Frequency Synthesizer IC Loop Filter External Reference 12 8MHz VCO Clock Data Chip Select Latch Enable Seria...

Page 38: ...h an attenuator pad A diplexer terminates the IF port of the mixer in 50 thus ensuring a good match for all mixing products as well as enhancing the linearity The post mixer buffer amplifier provides...

Page 39: ...signal in a fixed low impedance 50 This attenuates the VCO RF level down to a level suitable for the RF prescaler within the synthesizer IC A 12 8MHz temperature controlled crystal oscillator TCXO is...

Page 40: ...mplifier is used as a broad band isolator and low noise amplifier This has internal self bias circuitry and the output provides enough RF power to drive the following stages Harmonic Filter The VCO ha...

Page 41: ...lator Receiver VCO Programmable Reference Divider Programmable VCO Divider Phase Detector Lock Detect Output Charge Pump f ref f VCOfb Software Register VCO Feedback Attenuator Lock Detect Circuitry 6...

Page 42: ...e signal is now amplified again in a second RF amplifier and is then fed through a band pass filter and attenuator pad to the mixer Figure 2 7 Reciter UHF receiver RF circuitry block diagram Attenuato...

Page 43: ...exer terminates the IF port of the mixer in 50 thus ensuring a good match for all mixing products as well as enhancing the linearity The post mixer buffer amplifier compensates for the insertion loss...

Page 44: ...content i e their difference is zero or DC This is achieved by the phase detector part of the synthesizer IC which compares both divider references and delivers an error signal A 4mA charge pump circ...

Page 45: ...lator Receiver VCO Programmable Reference Divider Programmable VCO Divider Phase Detector Lock Detect Output Charge Pump f ref f VCOfb Software Register VCO Feedback Attenuator Lock Detect Circuitry 6...

Page 46: ...z to 753 9MHz The VCO is tuned to 70 1MHz below low side injection to produce the 70 1MHz IF signal at the output of the mixer The L band VCO frequency spans from 781 9MHz to 859 9MHz The VCO is tuned...

Page 47: ...h of the loop filter in the low pass filter i e 150Hz To obtain flat modulation across the audio band the VCO is also modulated simultaneously to obtain a composite high pass filter response Figure 2...

Page 48: ...Synthesizer The exciter synthesizer consists of a programmable frequency synthesizer IC the exciter VCO and a modulatable frequency reference The synthesizer uses a phase locked loop to lock the exci...

Page 49: ...Gate Twisted Ring Counter Digital Clock Buffer Digital Clock Buffer 12 8MHz FCL VCXO Oscillator 12 8MHz Reference Oscillator VCXO Modulation DC Offset Exciter VCO Programmable Reference Divider Progra...

Page 50: ...ital Clock Buffer Digital Clock Buffer 12 8MHz FCL VCXO Oscillator 12 8MHz Reference Oscillator VCXO Modulation DC Offset Exciter VCO Programmable Reference Divider Programmable VCO Divider Digital Cl...

Page 51: ...i e their difference is zero or DC This is achieved by the phase detector part of the synthesizer IC which compares both divider references and delivers an error signal A 4mA charge pump circuit also...

Page 52: ...erse isolation The B band VCO frequency spans from either 136MHz to 156MHz or 148MHz to 174MHz according to the product type The C band VCO frequency spans from either 174MHz to 193MHz or 193MHz to 22...

Page 53: ...r so that the attenuation rate slope decreases with an increase in frequency A fixed attenuator provides a signal level of 11dBm 2dB to the input port of the PA providing better reverse isolation The...

Page 54: ...cuitry on the system interface board provides additional signal processing so that the outputs meet standard system requirements It also enables the board to identify itself to the reciter control cir...

Page 55: ...net system interface board some pins on the system interface connector can be configured to provide different signals selectable by switch For more details refer to Application Note TN 1142 AN c The u...

Page 56: ...ty Connector Mutes SIPOs PISOs Conventional Signalling Interface System Interface Identification Third party Audio RSSI RSSI RS 232 RS 232 Rx Gate Rx Gate Tx Key Tx Key Tx Relay Tx Relay Opto coupled...

Page 57: ...1Vpp This output is AC coupled Balanced Audio Input The balanced audio input is a 600 audio interface The input level can be set over the range 20dBm to 10dBm for 60 modulation The input level can be...

Page 58: ...aximum voltage that should be applied across this output is 350V Third party Connector The third party connector provides access to audio keying gating and digital I O signals to allow the integration...

Page 59: ...ower the analogue sections of the system interface board via the digital board The 5 3V supply is regulated to 3 3V to power the RF synthesizers The RF board has a charge pump converter that generates...

Page 60: ...tection Circuit Linear 5V Regulator Dual SMPS Regulator Dual SMPS Regulator Comparators Fan Switch Filter Filter 5V Regulator Filter 5V Regulator Switch Filter 28V 28V 5 3V 8 5V 23V 8 5V to SIF 8V 8VE...

Page 61: ...RISC JTAG connector factory use only f flash memory g RISC h DSP i DSP JTAG connector factory use only j main digital system 1 power supply 1 digital IF and clock 1 DDC 1 ADC 1 40MHz digital clock 1...

Page 62: ...62 Reciter Circuit Description TB8100 Service Manual Tait Electronics Limited September 2006...

Page 63: ...ter VCO 1 exciter VCO trimmer 1 exciter synthesizer 1 exciter RF output 1 FCL 1 FCL buffers 1 power supply 1 external reference switch internal VCXO reference 1 front end second doublet 2 front end se...

Page 64: ...64 Reciter Circuit Description TB8100 Service Manual Tait Electronics Limited September 2006...

Page 65: ...iver synthesizer h IF i TCXO j audio buffers 1 exciter VCO 1 exciter VCO trimmer 1 exciter synthesizer 1 exciter RF output 1 FCL 1 FCL buffers 1 power supply 1 external reference switch internal VCXO...

Page 66: ...66 Reciter Circuit Description TB8100 Service Manual Tait Electronics Limited September 2006...

Page 67: ...CO 1 trimmer 1 exciter VCO 1 1 exciter VCO 2 trimmer 1 exciter VCO 2 1 exciter RF output 1 exciter synthesizer 1 FCL buffers 1 power supply 1 FCL 1 IF 2 front end 2 SAW filter L band only 2 front end...

Page 68: ...68 Reciter Circuit Description TB8100 Service Manual Tait Electronics Limited September 2006...

Page 69: ...oard is faulty you must return the complete reciter to your nearest Customer Service Organisation for repair or replacement The fault finding procedures provided in this chapter assume you are familia...

Page 70: ...g the availabil ity of specific models and options Product Code Description TBAXXXX XXXX 4 reciter 5 receive only reciter TBAXXXX XXXX 0 default TBAXXXX XXXX Frequency Band and Sub band B2 136MHz to 1...

Page 71: ...Tait Electronics Limited September 2006 Figure 3 1 Identifying the reciter boards digital board reciter shown fitted with isolated system interface board UHF H band RF board shown with shields remove...

Page 72: ...0STP calibration and test unit CTU with supplied cables Desktop power supply capable of providing 12V to 28V at 300mA or PMU with ammeter capable of measuring 300mA RF test set or equivalent individua...

Page 73: ...Antenna Input External Reference Input To PC running Service Kit or Calibration Kit System Control Bus also supplies power to CTU CTU Reciter Set up for all system interface boards except TaitNet RS...

Page 74: ...ions area 2 To find out which version of the Calibration Kit to use refer to the Compatibility Table in the TB8100 Base Station Release Notes These Release Notes are on the TB8100 Product CD and the l...

Page 75: ...ibed there The full procedure will normally involve removing the faulty board fitting a new board carrying out the specified reprogramming and recalibration tasks using the Calibration Kit carrying ou...

Page 76: ...gure 3 2 on page 73 3 Power up the reciter using the standard test voltage of 28VDC 4 Check that the current drawn is within the specified limits The current should be as listed in Table 3 1 If the cu...

Page 77: ...he connection is now successful check the state of the reciter If it is in Run mode or Standby mode go to Step 4 If it is in Download mode go to Step 3 If the connection is still unsuccessful return t...

Page 78: ...selecting an invalid channel as this will result in a channel invalid alarm make sure that it does not interfere with the operation of the reciter Select Configure Base Station General and check that...

Page 79: ...igital input switches on the CTU are set correctly 3 Select Configure Base Station General and check that a valid channel is selected 4 Reset the power If the alarm is still present return the complet...

Page 80: ...d remove the RF side cover 2 Power up the reciter 3 Using an oscilloscope check the 12 8MHz clock signal at the test point b on the RF board 4 Check for a clean wave form with the following specificat...

Page 81: ...TB8100 Service Manual Reciter Fault Finding 81 Tait Electronics Limited September 2006 Figure 3 4 Location of the 12 8MHz clock test point on the RF board b b B C and H bands K and L bands...

Page 82: ...plete reciter to your nearest CSO for repair or replacement 3 Check that the flexible connectors b are correctly positioned and latched in their sockets refer to Figure 5 2 on page 107 4 Check that al...

Page 83: ...ics Limited September 2006 Figure 3 5 Visual inspection points for the reciter UHF H band reciter shown fitted with isolated system interface board RF board shown with shields removed for clarity digi...

Page 84: ...nal reference input connector i and inject a signal at 98dBm 2dBm 2 2 V to 3 5 V at the correct IF frequency VHF 16 9MHz UHF 70 1MHz 5 Power up the reciter and put it into Run Mode Select Monitor Moni...

Page 85: ...t 117dBm 0 32 V into the antenna input 3 In the Receiver values area check that the Current RSSI value matches the level of the test signal and the Current SINAD value is greater than 12dB If the leve...

Page 86: ...ock band using the Calibration Kit and repeat this task Task 2 Check Exciter Output 1 Put the reciter in Run Mode and set the TX KEY switch on the CTU to ON 2 Select Diagnose Reciter Digital I O and c...

Page 87: ...Controlled Base Station 1 Use the Service Kit to disable the reciter s talk through functionality Select Configure Base Station Channel Profiles In the Edit Channel Profile screen go to the Signal Pa...

Page 88: ...that the deviation is 3kHz If the deviation is correct repeat your previous task as follows If your previous task was Task 2 repeat Task 2 If your previous task was Task 3 carry out the audio calibra...

Page 89: ...when running the test Don t use the CTU s internal load and an external termination 4 Click Start Test 5 View the Audio Output gauge and check that the measured output level is the same as the level d...

Page 90: ...mmended test equipment set up for audio checks 25 way cable SIF system interface board 16 way cable 15 way cable TaitNet RS 232 Exciter Output 28VDC 10 32VDC System Interface Antenna Input External Re...

Page 91: ...for repair or replacement If the voltages are 1Vpp or less replace the system interface board 9 Measure the audio voltages at the following test points on the digital board balanced line out IC1020 p...

Page 92: ...o Task 3 If the line levels are still incorrect either the digital board or system interface board is faulty If the measured output voltage is greater than the voltage displayed on the gauge go to Ste...

Page 93: ...level of the audio signal 5 If either audio input level is incorrect recalibrate the line levels using the Calibration Kit and repeat the test If the line levels are now correct go to Final Tasks on p...

Page 94: ...earest CSO for repair or replacement If the voltages are less than 0 5Vpp replace the system interface board The unbalanced line in voltage should be approximately 1Vpp If the voltage is 1Vpp or highe...

Page 95: ...rformance meets the specifications in Table 3 3 on page 97 7 Inspect the reciter to make sure that nothing has been damaged during any test or repair procedures Make sure all screws securing the cover...

Page 96: ...6 V 0 5V to 6V programmable slope Sensitivitya b De emphasised Response Centre of Switching Range Edge of Switching Range Flat Response Centre of Switching Range Edge of Switching Range a 12dB SINAD b...

Page 97: ...ncy Stability Hardware Version 0 02 or earlier Hardware Version 0 03 or later 1ppm 30 C to 60 C 22 F to 140 F 0 5ppm 30 C to 60 C 22 F to 140 F Power Output 11dBm 2dB Microphone Input Input Level Rang...

Page 98: ...98 Reciter Fault Finding TB8100 Service Manual Tait Electronics Limited September 2006...

Page 99: ...more information on antistatic procedures when handling these devices This chapter provides information on how to remove and refit the covers and front and rear panels Note Unless otherwise noted for...

Page 100: ...the centre pin of the SMA connector c from the RF board and remove the connector 3 Remove the two M3 Torx screws d securing the handle to the heatsink 4 Remove the M3 screw e securing the front panel...

Page 101: ...emove the two M3 Torx screws h securing each rear panel to the heatsink If you want to remove the rear panel on the RF side first unplug the coaxial cables from the RF board Figure 4 1 Removing the fr...

Page 102: ...front panel with the four M2 5 Torx screws b 5 Resolder the centre pin of the SMA connector c to the RF board 6 Refit the rear panel to the heatsink and secure with the two M3 Torx screws h If you ha...

Page 103: ...information on antistatic procedures when handling these devices This chapter provides information on how to remove and replace the system interface board Note Unless otherwise noted for the sake of s...

Page 104: ...board b from the socket on the system interface board 3 Remove the M3 Torx screws securing the board to the heatsink 4 Carefully lift the board upwards off the locating pins c and remove it from the h...

Page 105: ...nal as shown in the table below Board Type Procedure Details when the replacement system interface board is a different type from the original reprogram the product code reprogram the reciter type rep...

Page 106: ...106 Reciter Board Replacement TB8100 Service Manual Tait Electronics Limited September 2006 Figure 5 1 Replacing the system interface board b c c...

Page 107: ...Board Replacement 107 Tait Electronics Limited September 2006 Figure 5 2 Reconnecting the flexible connector flexible connector inserted straight into socket blue stripe on same side as latch latch p...

Page 108: ...108 Reciter Board Replacement TB8100 Service Manual Tait Electronics Limited September 2006...

Page 109: ...d in Table 6 1 Mechanical parts are listed in Figure 6 1 on page 111 Other items may become available as spares at a later date Consult your nearest Tait Dealer or Customer Service Organisation regard...

Page 110: ...110 Reciter Spare Parts TB8100 Service Manual Tait Electronics Limited September 2006...

Page 111: ...TaitNet Ethernet TaitNet RS 232 316 06802 XX 316 06798 XX 316 21279 XX 316 06865 XX 316 02023 XX 1 fan duct 316 06804 XX 1 rear panel RF side rear panel RF side with PEMs 316 06805 XX 316 06847 XX 1...

Page 112: ...112 Reciter Spare Parts TB8100 Service Manual Tait Electronics Limited September 2006...

Page 113: ...figuration of the 50W PA is similar but it uses only one 60W board and does not require the splitter or combiner boards The 5W PA does not use the 60W splitter or combiner boards The 12V PA is fitted...

Page 114: ...al Coupler Board RF I P PA Key RF O P 12VDC I P 12VDC O P Reciter DC 28VDC 28VDC RF RF Control Monitor Control Monitor Control Monitor System Control Bus 6W Board Control Board 60W Board 60W Board Amb...

Page 115: ...oard 1 50W and 100W PAs and 60W board 2 100W PA the ambient temperature of the intake air ambient temperature is defined as the temperature of the air from the cooling fan the PA fan must be in positi...

Page 116: ...f only when the key down sequence is complete 7 1 3 Power Foldback The PA control circuitry will reduce the RF output power to Pmin when any one of the following fault conditions occurs 1 the temperat...

Page 117: ...oard Driver 6W 50 Load 50 Load 1W Pre driver RF In RF Out RF Block RF Detect DAC DAC DAC DAC DAC ADC ADC ADC ADC ADC ADC ADC AND power control driver current driver temperature final 2 drive current f...

Page 118: ...tput power constant and protects the PA from VSWR mismatch conditions The control circuit monitors forward and reverse power and these measurements are used to determine forward and reverse power keep...

Page 119: ...est Diagnose Power Amplifier Control Tests to make the fan run Note also that the reading displayed for a 100W PA may be slightly high due to the location of the temperature sensor board in the heatsi...

Page 120: ...uitry Refer to Figure 7 2 on page 117 7 2 1 6W Board The 11dBm 2dB RF input is fed to the variable PIN diode attenuator which provides power control From the PIN diode attenuator the signal is fed via...

Page 121: ...forward and reflected power 7 2 4 Splitter and Combiner Boards In the 100W PA the output from the 6W board is split through a 3dB hybrid coupler on the splitter board to drive two 60W boards in quadra...

Page 122: ...is provided against the wrong input voltage being supplied Reverse polarity protection is provided by a diode between positive and ground and requires a user provided fuse or circuit breaker in series...

Page 123: ...rd temperature sense 1 6W driver transistor drain current sense 1 I2C signal filtering 1 RF input obscured 1 28VDC input 1 6W board 1 pre driver transistor 1 6W driver transistor 1 termination resisto...

Page 124: ...124 Power Amplifier Circuit Description TB8100 Service Manual Tait Electronics Limited September 2006...

Page 125: ...ir temperature board 1 I2C signal filtering 1 RF input 1 12VDC output for reciter 1 6W board 1 pre driver transistor 1 6W driver transistor 1 50W interconnect board 1 12VDC output 1 28VDC output 1 60W...

Page 126: ...126 Power Amplifier Circuit Description TB8100 Service Manual Tait Electronics Limited September 2006...

Page 127: ...rocedure is to discard the faulty board and fit a new one The fault finding procedures provided in this chapter assume you are familiar with the operation of the TB8100 Service Kit and Calibration Kit...

Page 128: ...solete components accord ing to your local regulations Caution Touching high power RF components or circuits can cause serious burns We strongly recommend you do not touch any RF components or tracks...

Page 129: ...ity of specific models and options Product Code Description TBAXXXX XXXX 7 5W 8 50W 9 100W TBAXXXX XXXX 0 default 1 12V PA TBAXXXX XXXX Frequency Band and Sub band B1 136MHz to 174MHz C0 174MHz to 22...

Page 130: ...a 28V PA b 6W board g 5W interconnect board c 60W board h 50W interconnect board d low pass filter directional coupler board i splitter board e control board j combiner board f ambient air temperatur...

Page 131: ...A b 6W board f ambient air temperature sensor board c 60W board g boost regulator board d low pass filter directional coupler board h 50W interconnect board e control board 50W 12V PA f e under shield...

Page 132: ...Calibration Kit Operational and calibrated reciter of the same frequency band as the PA under test refer to Software and Firmware Compatibility on page 136 Operational and calibrated PMU TB8100 subra...

Page 133: ...d cor rectly and is of the same frequency band as the PA under test When using a desktop power supply to power a 12V PA ensure the supply leads are of a suitable gauge to prevent excess voltage drop T...

Page 134: ...Limited September 2006 Figure 8 3 Recommended test equipment set up for initial checks 28V PA PMU PA PC CTU Reciter Control Panel DC DC 10 32VDC AC DC RS 232 system control bus system interface RF RF...

Page 135: ...checks 12V PA 12V PA PC CTU Reciter Control Panel 12 5VDC RS 232 system control bus system interface RF DC 10 32VDC RF connected within subrack Dual Base Station Subrack Interconnect Board RF Power M...

Page 136: ...ayed in the Versions area 2 To find out which version of the Calibration Kit to use refer to the Compatibility Table in the TB8100 Base Station Release Notes These Release Notes are on the TB8100 Prod...

Page 137: ...ent procedures described there The full procedure will normally involve removing the faulty board fitting a new board carrying out the specified reprogramming and recalibration tasks using the Calibra...

Page 138: ...These LEDs provide the following information about the state of the PA steady green the PA is powered up flashing green the PA has no application firmware loaded use the Service Kit to download the la...

Page 139: ...of PA If it is go to Final Tasks on page 170 If it is not go to Task 4 If the PA has generated any alarms go to Task 3 Task 3 Check Reported Alarms Any alarms generated by the PA under test will appe...

Page 140: ...ed a fault condition and has disabled the transmitter to prevent damage Check the other alarms to see what fault condition or conditions have caused this VSWR High The VSWR is above the configured thr...

Page 141: ...larms Thresholds If the threshold is below the recommended value given in Task 2 increase the value and check whether the alarm is still present If it is not present go to Visual Inspection on page 14...

Page 142: ...e default value of 80 C increase the value and check whether the alarm is still present If it is go to Step 2 If it is not go to Visual Inspection on page 144 2 Check the temperature of the PA with th...

Page 143: ...e detector bias voltages If the calibration is successful go to Step 3 If the calibration fails go to Low Pass Filter and Directional Coupler Board on page 165 3 Calibrate the PA power If the calibrat...

Page 144: ...e RF links c The quantity and location of these links will depend on the model of PA 5 Check that all screws are in place and secured correctly Refer to Screw Torque Settings on page 174 6 Check that...

Page 145: ...Checks for 12V PA The circled numbers in the following instructions refer to Figure 8 7 on page 147 1 Check the DC input filter capacitors b on the boost regulator board for damage e g overvoltage 2...

Page 146: ...146 Power Amplifier Fault Finding TB8100 Service Manual Tait Electronics Limited September 2006 Figure 8 6 Visual inspection points for a 28V PA b c d d e f g h i j 100W 5 50W VHF C band 100W PA shown...

Page 147: ...TB8100 Service Manual Power Amplifier Fault Finding 147 Tait Electronics Limited September 2006 Figure 8 7 Additional visual inspection points for a 12V PA b c e d VHF B band PA shown...

Page 148: ...8 1 on page 154 for a list of test points and their associated voltage levels The recommended test equipment set up is shown in Figure 8 8 on page 149 28V PA and Figure 8 9 on page 150 12V PA Note If...

Page 149: ...mited September 2006 Figure 8 8 Recommended test equipment set up for circuit board checks 28V PA PMU PA PC CTU Reciter Control Panel DC DC AC DC RS 232 system control bus system interface 10 32VDC RF...

Page 150: ...ard checks 12V PA 12V PA PC CTU Reciter Control Panel 12 5VDC DC RS 232 system control bus system interface 10 32VDC RF RF connected within subrack RF Power Meter Load Dual Base Station Subrack Interc...

Page 151: ...f one or more is not present go to 6W Board on page 155 Task 3 Check Voltage Levels 1 Measure the RF DET voltage at pin 2 of SK102 The voltage should be less than 0 8V If it is go to Step 2 If it is n...

Page 152: ...e final transistor s at the following test points 50W PA pin 2 of SK106 100W PA final 1 pin 2 of SK105 100W PA final 2 pin 2 of SK107 The voltage should be 4V typical If it is go to 6W Board on page 1...

Page 153: ...ual Power Amplifier Fault Finding 153 Tait Electronics Limited September 2006 Figure 8 10 Location of test points on the control board TP102 TP103 TP100 TP206 TP204 TP211 SK101 SK102 SK103 SK104 SK107...

Page 154: ...0 05V 10V 10V regulated supply to 6W board SK104 SK105 SK106 SK107 1 FINALX CURRENT MICROb 0 05V 2V typical current measured voltage 2 2 FINALX BIAS MICROb 0 05V 4V typical typical analogue voltage 3...

Page 155: ...test points the driver transistor and Tx Key circuitry are functioning correctly the output power is correct Figure 8 11 shows the location of the test points on the 6W board Refer also to Table 8 2...

Page 156: ...is not check the connection from the power supply to the PA 7 Check the connection between the pin of the feedthrough filter and the board If the connection is not faulty go to Step 8 If it is faulty...

Page 157: ...el 2 Put the base station in Run Mode and key the PA using the TX KEY switch on the CTU 3 Measure the RF detect voltage at pin 2 of SK102 The voltage should be less than 0 8V Measure the PA_KEY_COAX v...

Page 158: ...ridging link from the RF output 50 track b in Figure 8 11 on page 155 Solder the inner conductor of the test lead to the 50 track Solder the braid of the test lead to ground 3 Put the base station in...

Page 159: ...supply SK102 1 POWER CONTROL CONT 0 5V analogue voltage 2 RF detect 0 8V RF drive present 11dBm 3 PA KEY COAX 4 0V logic level 4 driver temperature digital digital signal 0V and 5V SK103 1 standby 0 5...

Page 160: ...o port 1 If there is continuity go to Step 3 If there is not go to Step 2 2 Check for faulty solder joints between the splitter and the PCB If the solder joints are not faulty replace the splitter boa...

Page 161: ...2 to the termination resistor If there is continuity go to Step 3 If there is not go to Step 2 2 Check for faulty solder joints between the combiner and the PCB If the solder joints are not faulty rep...

Page 162: ...vels are present at selected test points the final transistor is functioning correctly the output power is correct Figure 8 13 shows the location of the test points on the 60W board Refer also to Tabl...

Page 163: ...2 2 Remove the links from SK100 final 1 or SK101 final 2 Using an oscilloscope check that data is present on pin 3 of the control board connector If it is replace the 60W board If it is not replace t...

Page 164: ...wer meter is correct If it is go to Final Tasks on page 170 If it is not measure the voltage at TP1 The voltage should be 1 25V to 2 25V If it is go to Low Pass Filter and Directional Coupler Board on...

Page 165: ...tly placed or the PA may be damaged when it is keyed Figure 8 14 on page 166 shows the location of these components and Table 8 4 on page 167 lists when they are fitted If the compo nents are correctl...

Page 166: ...00 The voltage should be less than 0 5V If it is go to Final Tasks on page 170 If it is not replace the LPF directional coupler board Figure 8 14 Location of the test points and input coupling compone...

Page 167: ...145 R146 R138 R139 R145 R146 R138 R139 R145 R146 L IPN 036 10000 00 RES 0805 0R 1 8W Table 8 5 Test point voltages on the LPF directional coupler board Test Point Pin Name Tx Off Voltage Tx On Voltage...

Page 168: ...ut to 6W board 28VDC approximately d output to 60W board 28VDC approximately If the voltages are correct go to Task 2 If they are incorrect replace the boost regulator board Task 2 Check Power Saving...

Page 169: ...Run Mode 4 Select Alarms Current Alarm Status and check there are no alarms If there are go to Control Board on page 148 If there are no alarms go to Final Tasks on page 170 Figure 8 15 Test equipmen...

Page 170: ...eck that the DC supply current is within the specified limits when transmitting and not transmitting refer to Table 8 6 on page 171 5 Inspect the PA to make sure that nothing has been damaged during a...

Page 171: ...le 8 6 Supply current specifications Test Limits Supply Current 12V PAa Standby Transmit 5W PA at 5W 50W PA at 50W Maximum Typical 200mA 165mA 1 5A 1 2A 10 2A 9 2A Supply Current 28V PA Standby Transm...

Page 172: ...172 Power Amplifier Fault Finding TB8100 Service Manual Tait Electronics Limited September 2006...

Page 173: ...ween 4 8kg 10 6lb and 5 8kg 12 8lb Take care when handling the PA to avoid personal injury Important This equipment contains devices which are susceptible to damage from static charges Refer to ESD Pr...

Page 174: ...t to the heatsink Lift the airflow duct off the heatsink Cover 1 Remove the M3 Torx screws securing the cover to the heatsink and to the front panel 2 Remove the two M3 Torx screws securing the N type...

Page 175: ...TB8100 Service Manual Power Amplifier Disassembly and Reassembly 175 Tait Electronics Limited September 2006 Figure 9 1 Removing the airflow duct and cover b c d x3 on other side...

Page 176: ...On a 12V PA desolder the white DC output wire c from the feedthrough capacitor and desolder the red DC output wire d from the 6W board 2 Remove the four M2 5 Torx screws e securing the SMA connector...

Page 177: ...o the metal strap b soldered to the 6W board On a 12V PA resolder the white DC output wire c to the feedthrough capacitor and resolder the red DC output wire d to the 6W board 9 5 Refitting the Cover...

Page 178: ...178 Power Amplifier Disassembly and Reassembly TB8100 Service Manual Tait Electronics Limited September 2006...

Page 179: ...an cause serious burns We strongly recommend you do not touch any RF components or tracks in the PA while it is transmitting Caution The TB8100 power amplifier PA weighs between 4 8kg 10 6lb and 5 8kg...

Page 180: ...k compound underneath the board which pre vent effective heatsinking may cause these components to fail Important If you replace the 6W board you must recalibrate the PA bias using the Calibration Kit...

Page 181: ...d bottom of the board are clean Remove any old heatsink compound 2 Apply a thin layer of fresh heatsink compound to the bottom of the board underneath Q103 f D200 g and AT100 h if fitted Use as little...

Page 182: ...W PA remove the boost regulator board as described in Replacing the Boost Regulator Board in a 12V PA on page 193 3 Remove the bridging links b connecting the board to the control board 4 Desolder the...

Page 183: ...a New Board and Transistor Use the following instructions if you are fitting a new 60W board a new RF power transistor or have disturbed any of the solder joints around the transistor 1 Remove any old...

Page 184: ...tor you must recalibrate the PA bias using the Calibration Kit Refer to the Calibra tion Kit documentation for more details Refer to Power Amplifier Disassembly and Reassembly on page 173 for details...

Page 185: ...hich prevent effective heatsinking may cause the transistor to fail 4 Refit the two ground tags and secure the transistor to the heatsink with the two 4 40 UNC screws Progressively tighten each screw...

Page 186: ...he way first 5 Remove the M3 Torx screws securing the board to the heatsink 6 Carefully lift the board directly upwards off the locating pins f and remove it from the heatsink Refitting 1 To refit the...

Page 187: ...re Details reprogram the product code reprogram the PA type reprogram the serial number reprogram this information into the PA using the Calibration Kita refer to the Calibration Kit documentation for...

Page 188: ...ng and refitting the cover and for screw torque settings The circled numbers in the following instructions refer to Figure 10 6 on page 189 Removal 1 Remove the cover 2 On a 12V PA remove the boost re...

Page 189: ...older the tag on the ground plate to the inside of the shield wall Note In both cases make sure that the ground plate sits flat against the base of the N type connector otherwise the cover may not fit...

Page 190: ...anently damage the PA Refer to Power Amplifier Disassembly and Reassembly on page 173 for details on removing and refitting the cover and for screw torque settings The circled numbers in the following...

Page 191: ...the locating pins 4 Secure the board to the heatsink with the M3 Torx screws and M2 Pozidriv on VHF and tighten to the correct torque Important Do not overtighten the M2 Pozidriv screws or you may st...

Page 192: ...pads on the PCB 9 Retorque the 4 40 UNC screws after eight hours of operation 10 Refit the cover 10 8 Replacing the Interconnect Boards Refer to Power Amplifier Disassembly and Reassembly on page 173...

Page 193: ...necessary check the board is working correctly refer to Boost Regulator Board 12V PA Only on page 168 3 Refit the cover Refitting a New Board Replacement boost regulator boards are supplied as two sep...

Page 194: ...194 Power Amplifier Board Replacement TB8100 Service Manual Tait Electronics Limited September 2006 7 Refit the cover Figure 10 8 Replacing the boost regulator board in a 12V PA h g b c e d f j 1 i...

Page 195: ...Organisation regarding the availability of specific items Table 11 1 Spare circuit boards for the PA Description Spares Code 6W board B and C bands H band K band L band TBA SP PD0B1 TBA SP PD0H0 TBA S...

Page 196: ...Electronics Limited September 2006 Table 11 2 Replacement components for the PA Description IPN 60W board final transistor MRF9060 000 10090 60 splitter board termination resistor heatsink mounting 03...

Page 197: ...short 356 00010 01 2 3mm solder tag long 356 00010 03 2 4mm right angle solder tag 356 00010 74 2 RF link 356 01080 XX 2 ground tag for 60W RF power transistor 356 01081 XX 2 metal strap for feedthrou...

Page 198: ...er 316 87073 XX h M3x8mm pan head Torx screw spring flat washers 345 40470 XX i M3x12mm pan head Torx screw 349 02065 XX j boost regulator board Note The characters XX in an IPN Tait Internal Part Num...

Page 199: ...X c P clip 303 50107 XX d airflow duct centre panel 316 06818 XX e airflow duct side panel 316 06819 XX f M3x6mm countersunk Torx screw 345 40460 XX g M3x10mm pan head Torx Taptite screw 349 02066 XX...

Page 200: ...200 Power Amplifier Spare Parts TB8100 Service Manual Tait Electronics Limited September 2006...

Page 201: ...fitted to allow both AC and DC inputs If both the AC and DC modules are fitted the PMU uses the AC input by default and provides battery back up by operating from the DC input if the AC input is inter...

Page 202: ...Filter Card DC Control Card Auxiliary Power Supply Board Battery Control Card Standby Power Supply Card HVDC Control Microprocessor Card HVDC Circuitry DC Converter Board 28V 28V 28V O P PA System Con...

Page 203: ...from the microprocessor These are described in more detail in the paragraphs which follow Board and Card Name AC PMU DC PMU AC and DC PMU DC converter board fitted fitted DC input filter card fitted f...

Page 204: ...steresis Mode on page 209 for details on hysteresis mode and to Standby Power Supply below for details on deep sleep mode Figure 12 2 PMU microprocessor functional block diagram R 5V Supply Flash Prog...

Page 205: ...r supply is not fitted the microprocessor is powered by an internal 5V power supply derived from the main PA output Auxiliary Power Supply The microprocessor controls the on off function for this powe...

Page 206: ...from damage An MOV is fitted between line and phase to clamp low energy noise on the line A 10A fuse is also fitted for additional safety If the fuse blows it disconnects the PMU from the mains Inrush...

Page 207: ...main transformer The HVDC control circuitry is located on a separate card which plugs into the AC converter board Current Sense and Output Filter The current sense resistor provides the current output...

Page 208: ...the AC module to the DC module Although there is no circuitry involved this interface it is included in the block diagram to illustrate the interconnection between the AC and DC modules 12 3 DC Modul...

Page 209: ...ich is part of the primary control circuitry The power supply for the DC control circuitry is provided by the battery control card The DC control circuitry is located on a separate card which plugs in...

Page 210: ...erate when the main DC converter is shut down i e deep sleep mode It is protected from overload and short circuit The circuitry for the standby power supply is located on a separate card which plugs i...

Page 211: ...rom the DC converter board g current sense and output filter h 28VDC output for PA i 28VDC output for reciter j 28VDC output to auxiliary power supply board 1 microprocessor control 1 AC and DC voltag...

Page 212: ...212 Power Management Unit Circuit Description TB8100 Service Manual Tait Electronics Limited September 2006...

Page 213: ...e DC control f output to the current sense and output filter circuitry on the AC converter board g battery control h current transformer i standby power supply j EMC filter and protection Note In ord...

Page 214: ...214 Power Management Unit Circuit Description TB8100 Service Manual Tait Electronics Limited September 2006...

Page 215: ...to the DC converter board or AC converter board you must replace the complete DC or AC module The fault finding procedures provided in this chapter assume you are familiar with the operation of the TB...

Page 216: ...es You must disconnect the AC and DC supplies from the PMU before dismantling or carrying out any maintenance The PMU should be serviced only by qualified technicians All servicing should be carried o...

Page 217: ...erter board and standby power supply card are colour coded according to their nominal input voltage The auxiliary power supply board is also colour coded according to its nominal output voltage The co...

Page 218: ...3 1 Identifying the boards and cards in the PMU standby power supply card battery control card auxiliary power supply board DC converter board PFC control card AC converter board AC converter board DC...

Page 219: ...control panel front panel and appropriate interconnecting cables Variable voltage DC power supplies For testing the 12V and 24V DC converters and AC converter power supplies capable of providing 0V to...

Page 220: ...splayed in the Versions area 2 To find out which version of the Calibration Kit to use refer to the Compatibility Table in the TB8100 Base Station Release Notes These Release Notes are on the TB8100 P...

Page 221: ...edures described there The full procedure will normally involve removing the faulty board fitting a new board carrying out the specified reprogramming and recalibration tasks using the Calibration Kit...

Page 222: ...generates any alarms carry out Task 1 to Task 4 To carry out additional checks using the Service Kit go to Task 5 Note If you are testing an AC and DC PMU carry out these checks for both supplies In...

Page 223: ...ltage refer to Table 13 4 on page 239 This should ensure that the PMU powers up even if the startup voltage limit has been set to the maximum value 4 Check whether the LEDs b on the front panel are fl...

Page 224: ...tput voltages are now correct go to Task 3 If the output voltages are still incorrect go to DC Module on page 230 or AC Module on page 240 depending on which module is faulty If the PA output voltage...

Page 225: ...ication firmware loaded use the Service Kit to download the firmware then recalibrate the PMU on off the microprocessor is operating no alarm detected on flashing 3Hz one or more alarm conditions dete...

Page 226: ...age fields are correct 10 Select Alarms Current Alarm Status and check for alarms If there are alarms go to Task 4 If there are no alarms go to DC Module on page 230 or AC Module on page 240 if you ar...

Page 227: ...run replace the AC module Shutdown Imminent This alarm is generated when the battery voltage falls below the shutdown voltage limit The PMU will stay in this state for 30 seconds before shutting down...

Page 228: ...to Task 1 2 If the fault is still present after retesting select Monitor Module Details Power Management to determine which module is faulty and replace that module Output Voltage Low 1 Check that the...

Page 229: ...onverter which takes the 28VDC output from the DC or AC converter board and converts it to the required 12 24 48VDC nominal depending on the model of board This board is disabled by default and only o...

Page 230: ...y will decide how much load you can connect to the converter Testing at light loads will be enough to verify if the various modules are working A variable power supply with a 3A capability would be su...

Page 231: ...placing the cards go to Task 4 6 Connect a load to the DC output connector This will test the regulation to see if the output remains constant under load If the output voltage remains steady go to Tas...

Page 232: ...y decay to zero and the trip point cannot be determined 2 Check the behaviour of the DC converter and compare it with the Hardware Behaviour described in the graph in Figure 13 9 on page 238 The volta...

Page 233: ...ol card and repeat this step If the fault is still present go to Task 4 Note There are different grounds signal return paths associated with each connector You must use the correct ground to make mean...

Page 234: ...irst for a 12V PMU followed by voltages in brackets for a 24V PMU and a 48V PMU Task 1 Check DC Converter Board and HVDC Control and Microprocessor Card 1 Connect the DC module to the AC module as sho...

Page 235: ...der to show as much of the circuitry as possible in the photograph the heatsinks and the components normally attached to them are not fitted and the plug in cards are not plugged in auxiliary power su...

Page 236: ...croprocessor switches it on again 4 Measure the voltage at either PA output connector The output voltage should be 28VDC If it is go to Step 6 If it is not go to Step 5 5 Check that the DC converter i...

Page 237: ...own limits battery protection limits The voltage range for each of these parameters is provided in Table 13 4 on page 239 Figure 13 9 on page 238 illustrates how these parameters interact and how they...

Page 238: ...vervoltage Shutdown HW Undervoltage Shutdown HW Overvoltage Shutdown Reset HW High Battery Voltage Alarm SW Alarm Low Battery Voltage Alarm SW Alarm Startup Voltage SW Shutdown Voltage SW Startup Volt...

Page 239: ...t conditions as described in Table 13 2 on page 225 Table 13 4 PMU DC voltage limitsa Parameter Voltage Range 12V PMU 24V PMU 48V PMU User programmable Alarmsb Low Battery Voltage High Battery Voltage...

Page 240: ...ower resistor The variable voltage DC power supplies must be able to provide the correct input voltages for the AC converter under test The current capability of these power supplies will decide how m...

Page 241: ...utput on the front panel If the test point voltage is 400VDC but there is no PA output voltage replace the HVDC control and microprocessor card and repeat this task If the test point voltage is not pr...

Page 242: ...s Q305 Q306 approximately 3M3 If the resistance is correct go to Step 4 If it is not replace the AC module and go to Final Tasks on page 247 4 Check that the drain to source resistance of the HVDC FET...

Page 243: ...ent set up AC Converter HVDC Control Microprocessor Card PFC Control Card modified DC Supplies Main Input Power 0 30VDC Control Power 20VDC 220 1N4004 Input Output 1N4004 Load If you want to use the m...

Page 244: ...forms shown in Figure 13 12 go to Step 2 If they do not replace the AC module and go to Final Tasks on page 247 Important Ensure the oscilloscope is floating before earthing the oscil loscope at the s...

Page 245: ...tage If it does go to Task 5 If it does not replace the PFC control card and repeat this task Task 5 Check Regulation and Efficiency 1 Increase the current limit of the main input power supply to appr...

Page 246: ...t equipment set up shown in Figure 13 11 on page 243 which enables the AC converter to run on DC voltage The modifications described below will bypass the minimum operating voltage lock out 1 Connect...

Page 247: ...ontrol and supply tests Diagnose Power Management It is good practice to record the test results on a separate test sheet You can then supply a copy of the test sheet to the customer as confirmation o...

Page 248: ...248 Power Management Unit Fault Finding TB8100 Service Manual Tait Electronics Limited September 2006...

Page 249: ...tral The DC power on off switch disables only the control circuitry The DC input is still connected to the power circuitry Warning These switches do not totally isolate the internal circuitry of the P...

Page 250: ...dures when handling these devices Important Insulated gate FET transistors are susceptible to damage from static charges due to their extremely high input resist ance To avoid possible damage to the d...

Page 251: ...hey are configured in an AC and DC PMU Identifying the PMU on page 217 explains how to identify the model and hardware configuration of a PMU from its product code Note For the sake of simplicity and...

Page 252: ...ade screwdriver The cover should then be loose enough to lift off 2 Turn the PMU over and remove the four M3 Torx screws securing the bottom cover to the front and rear panels Lift off the bottom cove...

Page 253: ...ve the five M4 Torx screws securing the front panel to the heatsinks c and shield d Slide the front panel off the heatsinks 3 Remove the M4 Torx screw e grounding the rear panel to the AC converter bo...

Page 254: ...the mains input connector g from the AC converter board and remove the shield 14 7 Reconnecting the AC and DC Modules Unless otherwise indicated the circled numbers in the following instructions refe...

Page 255: ...TB8100 Service Manual Power Management Unit Disassembly and Reassembly 255 Tait Electronics Limited September 2006 Figure 14 2 Disconnecting the AC and DC modules AC module DC module b c d d f e g h...

Page 256: ...256 Power Management Unit Disassembly and Reassembly TB8100 Service Manual Tait Electronics Limited September 2006 Figure 14 3 Reconnecting the AC and DC modules c e b d f i g h...

Page 257: ...ors are correctly located in their respec tive holes in the panel before fully tightening the screws 3 Refit and tighten the M4 Torx screw grounding the front panel to the AC converter board 4 Fit the...

Page 258: ...of the PMU as the mounting holes in the cover will not align with the holes in the front and rear panels 2 Turn the PMU over and align the top cover over the front and rear panels Carefully slide the...

Page 259: ...ch disables only the control circuitry The DC input is still connected to the power circuitry Warning These switches do not totally isolate the internal circuitry of the PMU from the AC or DC power su...

Page 260: ...st ance To avoid possible damage to the device during han dling testing or actual operation we recommend you fol low these procedures avoid unnecessary handling when handling the device pick it up by...

Page 261: ...voltage of a replacement standby power sup ply card must match the DC input voltage of the DC mod ule i e 12VDC 24VDC or 48VDC nominal Fitting a card with the wrong input voltage may damage the DC mod...

Page 262: ...een the card and the edge of the AC or DC converter board d and push down e to lift the nearest plug out of its socket refer to Figure 15 1 3 Insert the card remover into the slot near the other end o...

Page 263: ...TB8100 Service Manual Power Management Unit Card and Board Replacement 263 Tait Electronics Limited September 2006 Figure 15 1 Replacing the plug in cards b c d e g f g...

Page 264: ...cards is fitted removed or replaced Procedure Details reprogram the product code reprogram the serial number reprogram this information into the PMU using the Calibration Kita refer to the Calibration...

Page 265: ...Reassembly on page 249 for details on removing and refitting the top and bottom covers and rear panel The circled numbers in the following instructions refer to Figure 15 2 Removal 1 Remove the top a...

Page 266: ...U as described in the table below There is no need for any recalibration when this board is fitted removed or replaced Procedure Details reprogram the product code use the Calibration Kit to reprogram...

Page 267: ...circuit boards for the PMU Description Spares Code AC modulea a Comes complete with PFC control card and HVDC control and microprocessor card TBA SP WAA0 DC moduleb b Comes complete with battery cont...

Page 268: ...268 Power Management Unit Spare Parts TB8100 Service Manual Tait Electronics Limited September 2006...

Page 269: ...fitted 357 01051 XX 2 plastic grommet 360 02026 XX 2 M3 T03 insulator bush 362 00010 11 2 10mm ID insulator bush with shoulder 362 00011 XX 2 seal when 40W aux PS board not fitted 362 01122 XX 2 AC co...

Page 270: ...g plate 316 06836 XX j M4x12mm pan head Torx Taptite screw 349 02058 XX 1 seal when 40W aux PS board not fitted 362 01122 XX Note The characters XX in an IPN Tait Internal Part Number stand for the is...

Page 271: ...puts and outputs for power audio and control signals This chapter provides an overview of all the control panel circuitry1 However not all the circuitry described here will be fitted to any particular...

Page 272: ...ates RS 232 communications from the programming port into 0V to 5V open collector signals which are connected to whichever reciter is selected with the channel button 17 2 Audio Circuitry Standard and...

Page 273: ...ives a signal on the RS 232 system control bus or serial port 17 4 Power Supply Standard Dual Base Station and Power Save The control panel operates off a 28V nominal power supply provided by the reci...

Page 274: ...pe Microphone Connector Speaker Fan Inputs RS 232 Connector Power Supply Microphone Audio System Control Bus Speaker Enable Speaker Audio I C Bus 2 28V GND Fan Power GND Open Collector RS 232 RS 232 B...

Page 275: ...Control Speaker Volume Gain Control Monitor LEDs Switches Channel LEDs Control Panel Type Microphone Connector Speaker Fan Rotation RS 232 Connector Power Supply Channel LED Control Decoding Microphon...

Page 276: ...276 Control Panel Circuit Description TB8100 Service Manual Tait Electronics Limited September 2006...

Page 277: ...his chapter provides information on how to identify remove and replace the main mechanical parts and circuit board Figure 18 4 on page 285 and Figure 18 5 on page 286 identify the main mechanical part...

Page 278: ...e control panel are as follows Product Codea a Some control panels were labelled as TBA20XX when sold as separate modules and XBA20XX when sold as part of a base station This is only a labelling diffe...

Page 279: ...nding upright d 5 With the board standing upright disconnect the flexible connector to the keypad e Refitting 1 Withdraw the flexible connector to the keypad through the hole in the side of the contro...

Page 280: ...280 Control Panel Servicing TB8100 Service Manual Tait Electronics Limited September 2006 Figure 18 1 Replacing the control panel board b c c d e e...

Page 281: ...ce Manual Control Panel Servicing 281 Tait Electronics Limited September 2006 Figure 18 2 Reconnecting the flexible connector flexible connector inserted straight into socket latch pushed fully down a...

Page 282: ...n page 279 2 Remove the M3 nuts and spring washers b and then remove the brackets c 3 Remove the speaker Refitting 1 To refit the speaker follow the removal instructions in reverse order Tighten the M...

Page 283: ...TB8100 Service Manual Control Panel Servicing 283 Tait Electronics Limited September 2006 Figure 18 3 Replacing the speaker b c x2 x2...

Page 284: ...e 286 Other items may become available as spares at a later date Consult your nearest Tait Dealer or Customer Service Organisation regarding the availability of specific items Table 18 1 Spare control...

Page 285: ...06820 XX i M3x8mm pan head Torx screw with spring flat washers 345 40470 XX j M3 hex nut 352 00010 08 1 M3 spring washer not fitted to Power Save control panel 353 00010 12 1 control panel board Note...

Page 286: ...03127 XX h chassis 316 06875 XX i M3x8mm pan head Torx screw with spring flat washers 345 40470 XX j M3 hex nut 352 00010 08 1 M3 flat washer 353 00010 10 1 M3 spring washer 353 00010 12 1 multi recit...

Page 287: ...ables used in single and dual base stations Figure 19 5 on page 293 identifies the cables and mechanical parts used in the multi reciter subrack Other items may become available as spares at a later d...

Page 288: ...288 Subrack Servicing TB8100 Service Manual Tait Electronics Limited September 2006...

Page 289: ...5 XX f spring clip 303 50106 XX g front panel 316 06821 XX h KC30x10mm pan head Torx PT screw 346 10030 10 i M4x40mm pan flange head Torx PT screw 346 10440 XX j quarter turn fastener 354 01047 XX 1 r...

Page 290: ...01049 XX 1 subrack ground connector 356 00010 61 1 9 5mm P clip 357 00010 48 1 insulating foam 362 01037 XX 1 insulator for interconnect board single base station insulator for interconnect board dual...

Page 291: ...0W PA to subrack interconnect board 219 02857 XX h system control bus ribbon cable PMU and 100W PA to subrack interconnect board replaced by 219 02857 XX in July 2006 219 02863 XX i system control bus...

Page 292: ...changed in August 2004 to match the change of connector in the PMU The old cables are still available under Tait part numbers 219 02895 00 single and 219 02896 00 double Contact your nearest Tait Deal...

Page 293: ...DC power cable subrack interconnect board to reciter 219 03068 XX g insulator for subrack interconnect board 362 01135 XX h DC power cable subrack DC input terminal block to subrack interconnect board...

Page 294: ...294 Subrack Servicing TB8100 Service Manual Tait Electronics Limited September 2006...

Page 295: ...o ground All base station digital inputs and outputs are open collector ADC Analog to Digital Converter A device for converting an analog signal to a digital signal that represents the same informatio...

Page 296: ...it command protocol used between computer equipment and a Tait radio channel A channel is A frequency pair or just a single frequency in a simplex system A set of configuration information that define...

Page 297: ...segregate groups of users custom action A custom action is a user defined Task Manager action that consists of more than one pre defined action custom input A custom input is a user defined Task Manag...

Page 298: ...responsible for producing European telecommunications standards F flag A flag is a programming term for a yes no indicator used to represent the current status of something The base station has a set...

Page 299: ...he servicing technician at the base station to communicate with each other over the line It connects the base station microphone to line out isolator An isolator is a passive two port device which tra...

Page 300: ...just before transmission ceases If the receiver is configured for reverse tone burst it responds by closing its gate RSSI RSSI Received Signal Strength Indicator is a level in dBm or volts that indic...

Page 301: ...identifies the base station indicates the current operating channel lists the status of all alarms and gives the current values of a number of other monitored parameters It also contains the alarm log...

Page 302: ...d line An unbalanced line has one wire earthed It is typically used for short connections for example between a base station and a repeater on the same site The system interface identifies the wires o...

Page 303: ...REVERSE COMPILE OR REVERSE ASSEMBLE ANY SOFTWARE OR FIRMWARE IN WHOLE OR PART Important Notice THE SOFTWARE OR FIRMWARE MAY CONTAIN OPEN SOURCE SOFTWARE COMPONENTS OPEN SOURCE COMPONENTS OPEN SOURCE C...

Page 304: ...LE AND TOTAL LIABILITY FOR ANY SUCH CLAIM SHALL BE LIMITED AT THE OPTION OF TAIT TO THE REPAIR OR REPLACEMENT OF THE SOFTWARE OR FIRMWARE OR THE REFUND OF THE PURCHASE PRICE OF THE SOFTWARE OR FIRMWAR...

Page 305: ...Limited vakuuttaa t ten ett TBAB1 TBAC0 TBAH0 tyyppinen laite on direktiivin 1999 5 EY oleellisten vaatimusten ja sit koskevien direktiivin muiden ehtojen mukainen Katso http eudocs taitworld com fr...

Page 306: ...306 TB8100 Service Manual Tait Electronics Limited September 2006...

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