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TAG11132-1

TLA 852/FLA 872

TM1205 Issue 2

Page 5 - 17

Figure 5.9: Display Module Waveforms

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Summary of Contents for FLA 872

Page 1: ...TM1205 Issue 2 Page i TECHNICAL MANUAL for RADIO PAGING RECEIVERS MODEL TLA 852 and MODEL FLA 872 Printed and Published in England...

Page 2: ...In line with the company policy of technical advancement the information within this document may be changed The user should ensure that the correct issue of the document is used Comments or correspon...

Page 3: ...tents Page iv Effective Page List Page v Safety Summary Warning Page vi Caution Section 1 Introduction and Specification Section 2 Operating Instructions Section 3 Technical Description Section 4 Inst...

Page 4: ...10 2 1 3 2 3 1 2 5 11 2 1 4 2 3 2 2 5 12 2 1 5 2 3 3 2 5 13 2 1 6 2 3 4 2 5 14 2 2 1 2 3 5 2 5 15 2 2 2 2 3 6 2 5 16 2 2 3 2 3 7 2 5 17 2 2 4 2 3 8 2 5 18 2 2 5 2 3 9 2 5 19 2 2 6 2 3 10 2 5 20 2 2 7...

Page 5: ...uld result in personal injury or loss of life CAUTION statements identify conditions or practices that could result in equipment damage WARNING CAUTION STATIC SENSITIVE DEVICES ARE USED WITHIN THIS EQ...

Page 6: ...TLA 852 FLA 872 TM1205 Issue 2 Page vi INTENTIONALLY BLANK...

Page 7: ...INTRODUCTION 1 2 1 2 FEATURES 1 3 1 3 SPECIFICATIONS 1 3 1 3 1 Receiver Performance 1 3 1 3 2 Power Supply 1 4 1 3 3 Code Format 1 4 1 3 4 Memory 1 5 1 3 5 Displays Controls and Alerts 1 5 1 3 6 Oper...

Page 8: ...The front panel buttons are used to transfer the stored part of the message to the screen as required Similarly if the FLA 872 receives a message which has more than 80 characters 40 characters in do...

Page 9: ...Optional Timed off Mode Low Battery Warning Battery Economy 1 3 SPECIFICATIONS 1 3 1 Receiver Performance Frequency Range 138MHz through 174 1MHz Frequency Bands Band 1 138 000MHz 143 499MHz Band 2 1...

Page 10: ...y shall not exceed 6dB Table 1 1 Sensitivity Figures MEASUREMENT MODE BEST TEM CELL POSITION dBm TYPICAL TYPICAL BAUD RATE On Pole 14dB Vm 104dBm 1200 12dB Vm 106dBm 512 1 1 20dB Vm 101dBm 2400 1 NOTE...

Page 11: ...ines of text FLA 872 Four lines of text Control Buttons Three push buttons Select Left and Right on the front panel of the unit control all the functions of the pager Display Illumination The display...

Page 12: ...rate to specification within these limits Operating Temperature 10EC through 55EC Storage Temperature 20EC through 60EC NOTE There may be some degradation of display performance below 0EC 1 3 7 Physic...

Page 13: ...8 Display Options FLA 872 2 8 2 2 9 Changing the Height of the Characters 2 8 2 2 10 Display Backlight FLA 872 2 9 2 2 11 Setting the Time and Date and Timed off Time 2 9 2 2 12 Deleting Messages 2 11...

Page 14: ...TLA 852 FLA 872 TM1205 Issue 2 Page 2 2 FIGURES Page 2 1 Controls and Display 2 3 2 2 Standby Screen 2 4 2 3 Option Screen Symbols 2 5 2 4 Opening the Battery Door 2 15 2 5 Lanyard Assembly 2 16...

Page 15: ...G CAUTION PROTECT THE PAGER FROM LIQUIDS STRONG MAGNETIC FIELDS AND EXTREME TEMPERATURES DO NOT LEAVE THE PAGER EXPOSED TO STRONG SUNLIGHT 2 1 CONTROLS AND INDICATORS Refer to Figure 2 1 for the ident...

Page 16: ...tons have these functions O Selects the unit functions Moves the cursor to the left Moves the cursor to the right 2 2 OPERATING INSTRUCTIONS 2 2 1 General The operation of most functions of the TLA 85...

Page 17: ...reen Figure 2 3 Option Screen Symbols 2 2 3 Setting the Options Make sure that the unit is ON and that the display shows the standby screen Push and release the O button The display will show seven sy...

Page 18: ...Messages To view the messages in the archive memory select the archive symbol on the options screen and push the O button Push the button to select the most recent message Push the or the button to s...

Page 19: ...nd hold the O button for one second or wait for the unit to time out The screen now shows the alarm symbol to indicate that the alarm is set 2 2 6 Alert The alert can be set to one of nine options sev...

Page 20: ...the display options screen This shows two options a To change the height of the message characters ABC refer to paragraph 2 2 9 b To operate the backlight refer to paragraph 2 2 10 2 2 9 Changing the...

Page 21: ...nd Timed off Time To set the time and date or the timed off time first select the set time function on the option screen as shown in paragraph 2 2 3 The set time screen then shows two options a Settin...

Page 22: ...ode j When the display shows the required time and date push the O button for one second to return to the standby screen or wait for the unit to time out B Setting Timed off Time This option sets the...

Page 23: ...peat operation ii through iv to set the required Stop Time hours and minutes vii To return to the standby screen push and hold the O button for one second or wait for the unit to time out 2 2 12 Delet...

Page 24: ...the O button to select the function The display shows the symbol plus a flashing symbol Push the O button to delete all the messages 2 2 13 Switching the Unit OFF The pager can be switched OFF sleep m...

Page 25: ...Messages To display the received messages starting with the newest message push the button To scroll through the messages use the or buttons If the message is longer than the screen can show push the...

Page 26: ...Service menu push the button when the screen shows the standby display The information menu screen shows a maximum of eight number symbols each enclosed within a circle Numbers which have unread Info...

Page 27: ...battery needs replacing the pager sounds an alert and the low battery symbol shows on the standby screen 2 4 2 Replacing the Battery a Refer to Figure 2 4 Use a thumbnail to press down on the battery...

Page 28: ...ULL THE LOOP THROUGH THE SLOT AS FAR AS POSSIBLE STAGE 3 FEED THE CLIP THROUGH THE LOOP AND PULL TIGHT TAG11261 1 TLA 852 FLA 872 TM1205 Issue 2 Page 2 16 Figure 2 5 Lanyard Assembly 2 5 LANYARD ASSEM...

Page 29: ...RECEIVER 3 4 3 3 DECODER 3 7 3 3 1 General 3 7 3 3 2 POCSAG Decoder 3 7 3 3 3 Microprocessor 3 8 3 3 4 EEPROM 3 8 3 3 5 SRAM 3 8 3 3 6 LCD Module 3 8 3 3 7 Display Illumination 3 9 3 3 8 Alerts 3 9 3...

Page 30: ...assemblies contained in a plastic case The case is constructed in two main parts the case front and the case back A cover on the back of the unit provides access to the battery compartment The two boa...

Page 31: ...s in battery economy mode When the unit is in standby mode the receiver is powered up at regular intervals equivalent to once per batch to allow the POCSAG decoder to search for pre amble While the un...

Page 32: ...ODER TP401 SINAD FSK COMP FILTER QUICK CHARGE AMP PHASE 1V REG TR406 1V SUPPLY 1V TP402 INT REF RXEN LOWB AGC CONTROL TLA 852 FLA 872 TM1205 Issue 2 Page 3 4 Figure 3 2 Receiver Block Diagram 3 2 DUAL...

Page 33: ...it TR403 and associated components receives the RF output of the image filter The RF signal is mixed with the local oscillator output to produce a 21 4MHz product This is matched to the filter FL401 b...

Page 34: ...it starts to operate The value of 68 kilohms sets it to approximately 16 dB above the noise floor The DC output from pin 22 of the IC connects to the AGC control circuit When there is no RSSI output t...

Page 35: ...ion in the SRAM IC4 before activating the selected alert and sending the message data to the LCD module for display The EEPROM holds information applicable to the unit 3 3 2 POCSAG Decoder The POCSAG...

Page 36: ...the LCD module on the databus Outputs from pins 2 and 7 control the operation of the audio alert and the vibrate motor IC3 also controls the internal functions of the system displaying the symbols and...

Page 37: ...lert signal from IC3 pin 7 connects to pin 1 of TR3 The alert can be selected ON or OFF using the buttons on the front panel 3 4 POWER SUPPLIES The primary power supply for the unit is a single 1 5 vo...

Page 38: ...If BAT1 is removed the drop in B causes transistor TR1 to switch OFF which sets the microprocessor to low current mode In this mode BAT2 supplies sufficient power to keep the microprocessor and the S...

Page 39: ...TLA 852 FLA 872 TM1205 Issue 2 Page 4 1 SECTION 4 INSTALLATION AND COMMISSIONING There are no installation and commissioning procedures for the Radio Paging Receiver Models TLA 852 and FLA 872...

Page 40: ...TLA 852 FLA 872 TM1205 Issue 2 Page 4 2 INTENTIONALLY BLANK...

Page 41: ...ts Removal 5 6 5 6 ASSEMBLY 5 7 5 6 1 Battery Terminal Installation 5 7 5 6 2 Vibrate Motor Installation 5 7 5 6 3 LCD Module Installation 5 8 5 6 4 Board Assembly 5 8 5 6 5 Board Assembly Installatio...

Page 42: ...n Radio Board and Decoder Board 5 10 5 5 Fault Finding Guide Sheet 1 of 3 5 11 5 6 Fault Finding Guide Sheet 2 of 3 5 12 5 7 Fault Finding Guide Sheet 3 of 3 5 13 5 8 Decoder Board Waveforms 5 16 5 9...

Page 43: ...py water Do not use spirit or other solvents as they can damage the case 5 3 WORKSHOP PROVISIONS Repair workshops must be free from hostile radio interference or otherwise equipped with Faraday cages...

Page 44: ...re required DC Power Supply 1 1 5 volts Cross point Screwdriver Surface Mount Handling Tools Anti static Workstation 5 5 DISASSEMBLY 5 5 1 Case Removal a Refer to Figure 5 1 Use a thumbnail to press d...

Page 45: ...embly Removal a Remove the Case Back see paragraph 5 5 1 b Carefully lift the Board Assembly at the long edge next to the LCD Module When the edge of the Board Assembly is clear of the case pull the a...

Page 46: ...n and the correct soldering tools to disconnect the flexible cable from the board 5 5 5 Vibrate Motor Removal a Remove the Board Assembly from the case see paragraphs 5 5 1 and 5 5 2 and separate the...

Page 47: ...10 Battery Negative Contact 11 Rubber Mat 12 Moulding Bezel LCD 13 Display Gasket Figure 5 3 Exploded View of Unit 5 6 ASSEMBLY 5 6 1 Battery Terminal Installation a Refer to Figure 5 3 for the corre...

Page 48: ...ss the two boards together until the connectors are fully connected 5 6 5 Board Assembly Installation a Slide the Board Assembly into the Case Back b Make sure that the Battery Connector fingers are i...

Page 49: ...known good battery in the unit and switch ON the unit Refer to the Fault Finding Guide Figures 5 5 through 5 7 If it is suspected that the Decoder Board is faulty proceed as follows a Remove the Board...

Page 50: ...he unit and set the output to 0 9 volts b Switch ON the unit The unit should go through the normal start up procedure beep and vibrate for one second and show the programmable switch on message for th...

Page 51: ...NK NO YES SEQUENCE IS BEEP AUDIBLE AT SWITCH ON IS BEEP AUDIBLE AT SWITCH ON DE CASE AND CHECK DISPLAY MODULE VDD AND YES NO DE CASE AND CHECK SP401 TR416 TR415 YES NO INTERCONNECTIONS DE CASE AND CHE...

Page 52: ...CHECK IC401 IS DATA PRESENT ON IC401 PIN 11 IS 455kHz PRESENT ON IC401 PIN 10 IS VOLTAGE ON IC401 PIN 17 1 3V CHECK FL404 AND IC401 FAULTY CHECK IC402 AND R457 CHECK R425 R429 IC401 IS 455kHz PRESENT...

Page 53: ...L410 AND R444 172MHz board TO 0V IS RF LEVEL AT NO YES YES NO YES NO YES YES YES NO C SHORT JUNCTION OF C407 R446 TO 0V IS IC401 PIN 24 3mV TR410 COLLECTOR 25mV TR403 BASE 3mV AND L406 IS RF AT TR402...

Page 54: ...cer Driver Table 5 1 Radio Board DC Voltage Levels TEST POINT DESCRIPTION VOLTAGE SIGNAL 401 SINAD Output 0 56Volts 402 Radio Supply 1Volt 403 RSSI AGC 0 060Volts 404 Radio Ground 0Volts 405 Second IF...

Page 55: ...C5 0 19dc 2 2 V p p 4ms wide XL2 4 19MHz R1 C4 3 00 R35 1 49dc 3 0V p p CLKO 38 4kHz IC402 pin9 1 49dc 3 0V p p XL403 38 4kHz Radio Board IC5 3 00 pin 1 3 00 pin 2 0 pin 3 Reset IC6 1 4 pin 1 3 00 pi...

Page 56: ...HE ENVELOPE 4ms WAVEFORM AT R1 C4 VOLTS TIME 4ms TAG11333 1 WAVEFORM AT C5 0V 3V VOLTS 0V 1 49V 3V p p 38kHz WAVEFORM AT R1 C4 WAVEFORM AT R35 AND IC402 PIN9 TIME TLA 852 FLA 872 TM1205 Issue 2 Page 5...

Page 57: ...0V WAVEFORM AT PIN 45 3V VOLTS 1 6ms TIME WAVEFORM AT PIN 40 0V 6V p p VOLTS TIME 1 6ms WAVEFORM AT PIN 41 0V 6V p p VOLTS 1 6ms TIME 0V WAVEFORM AT PIN 38 3V p p VOLTS TAG11132 1 TLA 852 FLA 872 TM12...

Page 58: ...DULE ALL DEVICES ARE VIEWED FROM ABOVE IC3 7 49 64 48 17 16 P 32 33 1 16 IC402 IC4 1 3 NC OUT 5 4 IC5 MIXER OUT Vcc REG OUT RSSI OUT RSSI IN 9 8 BS1 BS2 BS3 SIGNAL XVSS XT XTN VSS VDD ATTN SDI SDO SCK...

Page 59: ...18 23 25 34 38 39 P50 P57 P60 P67 P02 P03 Address lines AD00 AD17 24 VSS Ground 35 RESET P reset input signal 36 P00 AREA No valid data input signal 37 P01 ATTN Valid data input signal 40 VDD VDD 41 X...

Page 60: ...1 Address line AD01 10 A0 Address line AD00 11 D0 Data line D00 12 D1 Data line D01 13 D2 Data line D02 14 VSS Ground 15 D3 Data line D03 16 D4 Data line D04 17 D5 Data line D05 18 D6 Data line D06 19...

Page 61: ...input signal 19 VSS Ground 20 27 D0 D7 D00 D07 Data lines 28 31 DYO CLO SYN FR Not Used 32 CL Ground 33 OSC1 LCD Oscillator 34 OSC2 LCD Oscillator 35 37 T2 T1 VSS Ground 38 CAP1 DC DC voltage convert...

Page 62: ...403 to 0 volts Alternatively lift R409 5 8 2 Alignment Procedure a Configure the test equipment as shown in Figure 5 11 Set the signal generator to the channel frequency with an output of 10dBm b Put...

Page 63: ...eter to the alignment pins on the P671A refer to Figure 5 12 g Set the modulation of 1kHz to a deviation of 3 kHz and switch it ON Adjust CV404 to give 12dB sinad with minimum RF input A reading of 98...

Page 64: ...el of 85dBm b Install a known good battery in the pager and switch it ON c Put the pager in the P671A and send a sensitivity call from the P645 Increase the signal generator output level if necessary...

Page 65: ...TAG11124 1 60mm 14mm 52mm 20mm 20mm 20mm 5mm 80mm TLA 852 FLA 872 TM1205 Issue 2 Page 5 25 Figure 5 14 Polystyrene Block for TEM Cell Test Dimensions...

Page 66: ...669H Programming Software Programming Cable IBM PC or equivalent 5 9 3 Procedure Program the receiver as follows a Remove the Battery Door from the Case Back b Put the unit face down in the tray of th...

Page 67: ...2 2 Banded Capacitors 6 3 6 2 3 Crystal and Filters 6 4 6 2 4 Inductors 6 4 6 2 5 Resistors 6 4 6 2 6 Semiconductors 6 5 6 2 7 Miscellaneous 6 5 6 3 DECODER BOARD COMPONENTS 6 6 6 3 1 Capacitors 6 6...

Page 68: ...3 CASE FRONT RESTYLE BLUE 0301 0906 CASE FRONT BLUE 0301 0917 CASE FRONT SOFT BURG99 0801 0302 CASE FRONT GREY OMPT 0301 0923 WINDOW MULTITONE NEW LOGO 0961 5986 WINDOW MULTITONE 0961 5014 WINDOW VODA...

Page 69: ...HF 0861 5209 SCREW 2 2mm x 6mm PAN HEAD S TAP 8216 2296 6 3 RADIO BOARD COMPONENTS 6 3 1 Capacitors C403 410 412 414 472 473 484 CHIP 10n 10 50V 3327 0025 C404 406 453 481 CHIP 220p 5 50V 3326 0031 C4...

Page 70: ...0014 10p 0p5 50V 3326 0015 LINK RES CHIP 0S 3115 0001 ITEM CIRCUIT REFERENCE DESCRIPTION PART No 6 3 3 Crystal and Filters FL401 CRYSTAL FILTER 21 4MHz 4001 0025 FL402 403 CERAMIC FILTER SMD 10 12 5k...

Page 71: ...9 CHIP 180k 5 512 BAUD 3115 0128 R425 428 429 CHIP 82k 1200 BAUD 3115 0120 R425 428 429 CHIP 39k 5 2400 BAUD 3115 0112 R434 446 CHIP 15k 5 62m5W 3115 0102 R440 CHIP 220S 5 62m5W 3115 0058 R443 CHIP 5k...

Page 72: ...P 47S 5 62m5W 3115 0042 R9 CHIP 1k 5 62m5W 3115 0074 R10 CHIP 18k 5 62m5w 3115 0104 R11 21 22 CHIP 470k 2 62m5W 3118 0138 R12 20 CHIP 150k 2 3118 0126 R13 CHIP 680k 2 3118 0142 R14 28 CHIP 1M 2 0603 3...

Page 73: ...N PART No 6 4 5 Miscellaneous BAT2 CAPACITOR POLYESTER PAS621L VL5 3331 0002 LP1 2 LAMP HE1 5VXXMA 5202 0007 SK1 HEADER DUAL ROW RECEPT14WAYSMD 4449 0002 SW1 2 3 SWITCH SMD KSR221G 4202 0026 T1 TOROID...

Page 74: ...TLA 852 FLA 872 TM1205 Issue 2 Page 6 8 INTENTIONALLY BLANK...

Page 75: ...373 Iss 2 7 9 10 Component Layout Side 2 Sheet 2 7 5 Decoder Board PCB 3061 5169 Iss 1 2961 5167 Iss 2 7 11 12 Circuit Diagram 7 6 Decoder Board PCB 3061 5169 Iss 1 0261 5168 Iss 1 7 13 14 Component L...

Page 76: ...TLA 852 FLA 872 TM 1205 Issue 2 Page 7 2 INTENTIONALLY BLANK...

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