TECHNICAL MANUAL for RADIO PAGING RECEIVERS MODEL TLA 852 and MODEL FLA 872 > Printed and Published in England TM1205 Issue 1 Page (i)
TLA 852/FLA 872 COMPANY LIABILITY The information in this manual has been carefully compiled and checked for technical accuracy. Multitone Electronics plc accept no liability for inaccuracies or errors. 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.
CONTENTS TM1205 Issue 2 Page (i) Title Page Page (ii) Company Liability Page (iii) Contents 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 Installation & Commissioning Section 5 Servicing Section 6 Spare Parts List Section 7 Diagrams Page (iii)
TLA 852/FLA 872 EFFECTIVE PAGE LIST Page No. Issue Page No. Issue (i) (ii) 1 1 2-9 2-10 1 1 (iii) (iv) 1 1 2-11 2-12 (v) (vi) 1 1 1-1 1-2 Issue Page No.
FCC & IC Statement Of Compliance This device complies with FCC Part 15 & Industry Canada RSS210 regulations. Operation is subject to the following two conditions:- (1) this device may not cause harmful interference and (2) this device must accept any interference received, including interference that may cause undesired operation. Unauthorised modification to this equipment, will void the user’s authority to operate the device under the terms of the above regulations.
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TLA 852/FLA 872 SECTION 1 INTRODUCTION & SPECIFICATION CONTENTS: Page 1.1 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 Operational Environment 1-6 1.3.7 Physical Characteristics 1-6 TABLES: 1.
TLA 852/FLA 872 1.1 INTRODUCTION The MultitoneTLA 852 and FLA 872 Radio Paging Receivers are VHF receivers which receive messages sent in CCIR Radiopaging Code No.1 (RPC1). The front panel of the unit has a Liquid Crystal Display (LCD) to display messages and other information. The three buttons on the front panel are used to control the functions of the unit.
TLA 852/FLA 872 1.2 FEATURES The unit has these features: ! Displays two lines of 20 characters - TLA 852 (four lines - FLA 872) ! Message Store ! Information Service Messages (Optional) ! Display Backlight ! Date/Time Display ! Selectable Alert - Audible Beep or Vibration ! Alarm ! Out of Range Indication (Optional) ! Timed-off Mode ! Low Battery Warning ! Battery Economy 1.3 SPECIFICATIONS 1.3.1 Receiver Performance Frequency Range: 138MHz through 174.
TLA 852/FLA 872 Sensitivity: The sensitivity figures quoted in Table 1 assume an ambient temperature in the range 18EC through 25EC. The battery voltage should be above the low battery trigger point of approximately 1.15 volts. At temperatures between the ambient and maximum / minimum, performance is at an intermediate value. At temperature extremes degradation of sensitivity shall not exceed 6dB. Table 1.1: Sensitivity Figures NOTE: 1.3.2 1.3.
TLA 852/FLA 872 1.3.4 1.3.5 Memory Capacity: The units can accept messages to a maximum of 1024 characters. They can store a maximum of 32 read or unread messages and six archive messages. Recall: Stored messages can be retrieved in any order. Displays, Controls and Alerts Liquid Crystal Display: TLA 852: Two lines 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.
TLA 852/FLA 872 1.3.6 Operational Environment The unit will operate to specification within these limits: Operating Temperature: -10EC through +55EC Storage Temperature: -20EC through +60EC NOTE: 1.3.7 There may be some degradation of display performance below 0EC.
TLA 852/FLA 872 SECTION 2 OPERATING INSTRUCTIONS CONTENTS: Page 2.1 2.1.1 2.1.2 CONTROLS AND INDICATORS Display Controls 2-3 2-4 2-4 2.2 2.2.1 2.2.2 2.2.3 2.2.4 2.2.5 2.2.6 2.2.7 2.2.8 2.2.9 2.2.10 2.2.11 2.2.12 2.2.
TLA 852/FLA 872 FIGURES: Page 2.1 2.2 2.3 2.4 2.
TLA 852/FLA 872 WARNING DO NOT TAKE THE PAGER INTO AREAS WHERE EXPLOSIVE GASES, OR DUST MAY BE PRESENT. 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 identification and location of the controls and display associated with the TLA 852 and FLA 872. Note: In Germany, Style A (aerofoil) case is only for T Mobile use.
TLA 852/FLA 872 2.1.1 Display The Liquid Crystal Display (LCD) in the TLA 852 shows two lines of characters. The FLA 872 shows four lines of characters (or two lines of double height characters) . Each line can have a maximum of 20 characters. Both units can also show a maximum of seven symbols in a line. Lamps (Electro-luminescent (EL) option also available - FLA Series only) are incorporated in the unit, to illuminate the display when required. 2.1.
TLA 852/FLA 872 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 symbols. These are: Z ARCHIVE ALARM ALERT BACKLIGHT SET TIME DELETE MESSAGES Z Z OFF TAG11216-1 TLA 852 Option Screen Z ARCHIVE ALARM ALERT DISPLAY SET TIME DELETE MESSAGES Z Z OFF TAG11264-1 FLA 872 Option Screen Figure 2.
TLA 852/FLA 872 2.2.4 Archive a) General The operator can use this option to archive received messages and also to view messages in the archive store. b) Archiving Messages Select the required message and view the complete message by pressing the O> button. After the last screen of the message is displayed, push the or the button to choose the archive symbol. Í Ì When the archive symbol flashes, push the O> button. The display shows the archive symbol plus a flashing ?.
TLA 852/FLA 872 When the alarm is set to ON and the alarm time is reached, the standby screen will show a flashing alarm symbol and the alert will operate for eight seconds. To stop the alert within the eight second period, push any button. To set the alarm time, set the alarm to ON. The display shows the alarm symbol and also shows the time the alarm is set to sound. To change the time: - Push the O> button and the hour numbers flash. Use the set the required hour.
TLA 852/FLA 872 2.2.7 Display Backlight (TLA 852) The unit display has a backlight which allows the display to be read in low-light conditions. To operate the backlight, first select the backlight function on the option screen as shown in paragraph 2.2.3 When the backlight screen shows, use the ON or OFF. ¬ or - buttons to select the backlight 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.
TLA 852/FLA 872 2.2.10 Display Backlight (FLA 872) Select the display option screen, then push the O> button to choose the backlight function. Use the ¬ or - buttons to select the backlight ON or OFF . To return to the standby screen, push and hold the O> button for one second or wait for the unit to time-out. 2.2.11 Setting the Time and Date and 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.
TLA 852/FLA 872 d) Push the O> button again and the tens of minutes number flashes. Set the required figure with the or buttons. e) Push the O> button to make the minutes number flash. Set the required figure with the or buttons. f) Push the O> button again and the date ‘day’ numbers flash. Use the buttons to set the required figures. g) Push the O> button again and the ‘months’ numbers flash. Set the required figure with the or buttons. h) Push the O> button again to make the ‘year’ numbers flash.
TLA 852/FLA 872 Z Z 11:15pm 6:45am ¬ - ii) Push the iii) Push the O> button to select the next number (tens of minutes) then push the or buttons to select the required number. iv) Push the O> button again to select the next number (minutes) then push the or buttons to select the required number. v) Push the O> button again to select the next number (Stop Time hours). vi) Repeat operation ii) through iv) to set the required Stop Time hours and minutes.
TLA 852/FLA 872 b) Deleting All Stored Messages All the messages in the store memory (but not those in the archive memory) can be deleted in one operation. Push the O> button to show the seven option symbols. Use the ¬ or - buttons to choose the symbol. Push 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.
TLA 852/FLA 872 2.3 RECEIVING AND STORING MESSAGES 2.3.1 Receiving a Message When the pager receives a new message the first part of the message shows on the display and the alert operates for eight seconds. Push any button to acknowledge receipt of the message and to stop the alert. If the call is not acknowledged the pager will give a short alert every five minutes for a maximum period of one hour. - To display the message, push the button.
TLA 852/FLA 872 The unit memory can hold a maximum of 20 messages. When this number is reached the standby screen shows the memory full symbol. If a new message is received when the memory is full, the oldest message is deleted. 2.3.3 Archiving Messages Messages can be protected by transferring them to the Archive Store. Refer to paragraph 2.3.4 or paragraph 2.4.2. for the procedure. 2.3.
TLA 852/FLA 872 2.4 LOW BATTERY 2.4.1 Low Battery Warning When the 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 door lock on the back of the unit. Hold the door lock down and push the battery door in the direction shown. Rotate the door as shown in Figure 2.4 to gain access to the battery. b) Remove the old battery.
TLA 852/FLA 872 2.5 LANYARD ASSEMBLY Figure 2.5 shows the method of assembling the lanyard to the unit. STAGE 2 STAGE 1 SQUEEZE THE LOOP TOGETHER AND PUSH IT INTO THE SLOT PULL THE LOOP THROUGH THE SLOT AS FAR AS POSSIBLE STAGE 3 FEED THE CLIP THROUGH THE LOOP AND PULL TIGHT TAG11261-1 Figure 2.
TLA 852/FLA 872 SECTION 3 TECHNICAL DESCRIPTION CONTENTS: 3.1 3.2 3.3 3.3.1 3.3.2 3.3.3 3.3.4 3.3.5 3.3.6 3.3.7 3.3.8 3.4 CIRCUIT SUMMARY DUAL CONVERSION RECEIVER DECODER General POCSAG Decoder Microprocessor EEPROM SRAM LCD Module Display Illumination Alerts POWER SUPPLIES Page 3-2 3-4 3-7 3-7 3-7 3-8 3-8 3-8 3-8 3-9 3-9 3-9 FIGURES: 3.1 3.2 3.
TLA 852/FLA 872 3.1 CIRCUIT SUMMARY The TLA 852 and FLA 872 radio paging receivers each consist of two Printed Circuit Board (PCB) 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 boards in the case are: a) The Radio Board which has the Dual Conversion Receiver, the POCSAG Decoder, the 1 volt regulator and the audio alert output circuit and transducer.
TLA 852/FLA 872 The RF signal enters the aerial and is fed to the dual conversion superheterodyne receiver. The signal is demodulated from RF to audio frequency digital form and is then fed to the decoder. This results in the received data activating the memory, display and the selected audible alert or vibrate alert. To prolong the life of the battery, the receiver operates in battery economy mode.
TLA 852/FLA 872 3.2 DUAL CONVERSION RECEIVER TR404 AGC CONTROL FL401 TR401, TR402 CV404 TR403 IMAGE FILTER RF AMPLIFIER CV407 MIXER 21.4 MHz CV406 GND XL402 TP403 (OPTIONAL) AE401 AE402 GND TR410 CV405 1st OSC. IC401 RSSI MIXER, IF AMP & DET. MIXER FL402 TP405 FL403 455kHz CER DET IF AMP FILTER AMP QUICK CHARGE FSK COMP. DECODER 455kHz CER TP401 SINAD XL401 LOWB INT. REF. 2nd OSC. 1V REG RXEN DELAY FL404 PHASE TR406 1V SUPPLY TP402 1V TAG11263-1 Figure 3.
TLA 852/FLA 872 The output from the RF amplifier passes through an image filter which provides these functions: a) Attenuation of signals outside the required band. b) Attenuation of the first image frequency. c) Matches the output impedance of the RF amplifier to the input impedance of the mixer stage. L401 and CV407 form a parallel tuned circuit with the resonant frequency set to the carrier frequency. L407 forms a series resonant circuit which provides a notch filter at the image frequency.
TLA 852/FLA 872 Due to the characteristics of filters FL401, FL402 and FL403, the signal at the input to the IF amplifier has amplitude modulation (AM). The AM must be removed before the signal reaches the detector stage. This is performed by the IF amplifier in IC401 which has very high gain and is designed to limit the amplitude of the signal to remove the AM component and give a ‘square’ output. C479 and C480 provide de-coupling for the IF amplifier.
TLA 852/FLA 872 3.3 DECODER SRAM IC4 EEPROM IC1 ADDRESS BUS LIQUID RESET DATA BUS VDD RESET IC5 XL403 DATA POCSAG DECODER IC402 CRYSTAL PL401 SK1 DISPLAY MICROPROCESSOR MODULE CONTROL LINES RESET IC3 FROM RECEIVER TP401 SK1 PL401 PGM DRIVER TR415 TR416 !>BUTTON BUTTON BUTTON SW3 DRIVER TR2 OR SW2 SW1 DRIVER TR3; TR4 AUDIBLE ALERT DISPLAY ILLUMINATION M VIBRATE MOTOR TAG11122-1 Figure 3.3: Decoder Block Diagram 3.3.
TLA 852/FLA 872 Pin 9 (CLK0) provides clock pulses to operate the microprocessor while it is in standby mode. Pin 11 (AREA) goes high when a valid signal is received. Pin 14 (SDI) receives program information from the microprocessor. Pin 2 (BS2) controls the ‘fast charge’ operation of the FSK comparator in IC401. 3.3.3 Microprocessor The microprocessor controls the functions of the unit. A 4.19MHz clock, controlled by XL2, provides the basic timing for the system.
TLA 852/FLA 872 C20 and C21 are part of the internal DC/DC converter of the module’s negative bias supply. R11, R12, R13, C17 and C22 through C25 are part of the circuit which controls the voltage to the LCD driver. 3.3.7 Display Illumination Two miniature lamps are used to illuminate the LCD display. The lamps are selected ON or OFF using the buttons on the front panel.
TLA 852/FLA 872 IC5 monitors the voltage of VDD and resets the decoder circuits if the voltage drops to a level that would cause data corruption. Transistor TR1, connected to pins 6 and 15 of IC3, detects the battery voltage. 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 SRAM operational for up to 60 minutes.
TLA 852/FLA 872 SECTION 4 INSTALLATION AND COMMISSIONING There are no installation and commissioning procedures for the Radio Paging Receiver Models TLA 852 and FLA 872.
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TLA 852/FLA 872 SECTION 5 SERVICING CONTENTS: Page 5.1 SERVICE POLICY 5-3 5.2 ROUTINE MAINTENANCE 5-3 5.3 WORKSHOP PROVISIONS 5-3 5.4 5.4.1 5.4.2 TEST EQUIPMENT, TOOLS AND ANCILLARIES Test Equipment Tools and Ancillaries 5-3 5-3 5-4 5.5 5.5.1 5.5.2 5.5.3 5.5.4 5.5.5 5.5.6 DISASSEMBLY Case Removal Board Assembly Removal Board Separation LCD Module Removal Vibrate Motor Removal Battery Contacts Removal 5-4 5-4 5-5 5-5 5-6 5-6 5-6 5.6 5.6.1 5.6.2 5.6.3 5.6.4 5.6.5 5.6.
TLA 852/FLA 872 TABLES Page 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5 - 14 5 - 14 5 - 15 5 - 15 5 - 19 5 - 20 5 - 21 Radio Board DC Voltage Levels Radio Board Test Points Decoder Board DC Levels Decoder Board Test Sequence IC3 Microprocessor Pin Connections IC4 RAM Pin Connections LCD Display Pin Connections FIGURES: 5.1 5.2 5.3 5.4 5.5 5.6 5.7 5.8 5.9 5.10 5.11 5.12 5.13 5.
TLA 852/FLA 872 5.1 SERVICE POLICY Except for Routine Maintenance, repairs are only to be performed by qualified personnel in authorised workshops. The unit can be repaired to component level. The display module is a disposable item. If any screening cans are removed for access to components, they must be refitted flush to the printed circuit board. 5.2 ROUTINE MAINTENANCE This is limited to battery replacement and surface cleaning of the outer case.
TLA 852/FLA 872 5.4.2 Tools and Ancillaries The following tools and ancillaries are 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 down on the battery door lock on the back of the unit. Hold the door lock down and push the battery door in the direction shown. Rotate the door as shown in Figure 5.1 to get access to the battery.
TLA 852/FLA 872 APPLY PRESSURE WITH FINGERS TO SIDES OF CASE > LIFT FRONT EDGE OF CASE FRONT UNTIL REAR CATCHES DISENGAGE TAG11213-1 Figure 5.2: Case Front Removal d) 5.5.2 5.5.3 Remove the Case Back by applying pressure to the sides of the case, as shown in Figure 5.2, and lifting the front edge of the Case Front until the rear catches disengage. Board Assembly 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.
TLA 852/FLA 872 5.5.4 5.5.5 5.5.6 LCD Module Removal a) Remove the Board Assembly from the case (see paragraphs 5.5.1 and 5.5.2) and separate the Decoder Board from the Radio Board (see paragraphs 5.5.3., a) through c)). b) Release the two module pins from the holes in the Decoder Board and carefully fold the module away from the board to get access to the flexible cable. c) Use the Anti-static Workstation and the correct soldering tools to disconnect the flexible cable from the board.
TLA 852/FLA 872 5.6 ASSEMBLY 1 13 12 2 3 11 4 5 10 9 6 8 7 TAG11214-1 1. 2. 3. 4. 5. 6. 7. Case Front Assembly LED Display Decoder Board Assembly Radio Board Assembly Case Back Assembly Battery Positive Contact Case Fixing Screw 8. 9. 10. 11. 12. 13. Battery Door Case Fixing Screw Battery Negative Contact Rubber Mat Moulding Bezel LCD Display Gasket Figure 5.3: Exploded View of Unit 5.6.1 5.6.2 Battery Terminal Installation a) Refer to Figure 5.3 for the correct orientation of the terminal.
TLA 852/FLA 872 5.6.3 5.6.4 5.6.5 5.6.6 LCD Module Installation a) Use the Anti-static Workstation and the correct soldering tools to connect the flexible cable to the Decoder Board. b) Carefully fold the flexible cable and install the two pins on the rear of the module in the holes on the Decoder Board. Board Assembly a) Make sure that the Rubber Mat is correctly installed on the Radio Board. b) Put the Decoder Board on the Rubber Mat.
TLA 852/FLA 872 5.7 FAULT FINDING 5.7.1 General Refer to the Fault Finding Guide (Figures 5.5 through 5.7) and the information given in Tables 5.1 through 5.8 and Figures 5.8 through 5.10 to help resolve problems. Alignment information is in paragraph 5.8. Programming information is given in paragraph 5.9. Faults can be caused by user negligence.
TLA 852/FLA 872 PL401 8 7 SK1 BEC GND 7 8 1 14 38.4kHz B+ RESET VDD SDI AREA SDO ATTN SCK PGM 14 1 LOWBAT BEEP TAG11336-1 Figure 5.4: Connections between Radio Board and Decoder Board 5.7.4 Battery-Low Circuit Test To check the Battery-Low circuit: a) Connect the variable DC power supply to the unit and set the output to 0.9 volts. b) Switch ON the unit.
TLA 852/FLA 872 PAGER SUSPECT FIT A NEW BATTERY AND SWITCH ON. 'A' IS THE ‘SWITCH ON’ MESSAGE NO YES SEQUENCE? BLANK CORRUPTED IS DISPLAY BLANK OR CORRUPTED? CORRUPTED EEPROM. RE-PROGRAM. RE-TEST. NO IS BEEP AUDIBLE AT SWITCH-ON? YES DE-CASE AND CHECK DISPLAY MODULE, VDD AND INTERCONNECTIONS. 'A' DE-CASE AND CHECK DISPLAY, VDD, IC1, IC3, IC4, AND POWER SUPPLIES. NO IS BEEP AUDIBLE AT SWITCH-ON? YES DE-CASE AND CHECK SP401, TR416, TR415. 'A' 'B' TAG11127-1 Figure 5.
TLA 852/FLA 872 ‘B’ YES >3dBm LOW CHECK SENSITIVITY. PLACE THE UNIT IN THE P671. SEND A CALL. NO IS THE CALL RECEIVED? ‘B’ O.K. YES REALIGN AND RE-TEST RECEIVER O.K. DE-CASE. PLACE IN P671. CHECK 1V LINE. IS LEVEL 1V ±50mV? SEND PRE-AMBLE. AT 50dBm WITH ±4.5kHz DEVIATION. NO CHECK TP416, TR406, IC401.
TLA 852/FLA 872 ‘C’ IS 455kHz PRESENT ON TP405? YES NO FL402 OR C444 FAULTY. IS 2nd LOCAL OSC. O/P (IC401, PINS 1 AND 2) >200mV? NO YES SHORT JUNCTION OF C407/R446 TO 0V. IS IC401, PIN 24 >3mV? CHECK XL401 YES NO IS TR403 (1st MIXER O/P) >3mV? CHECK IC401 YES CHECK FL401, L410 AND R479 (280MHz board). R444 (172MHz board). REMOVE SHORT FROM C407/R446 TO 0V. NO IS 1st LOCAL OSC. O/P (TR410 COLLECTOR) >25mV? CHECK TR410, L408 AND XL402. YES NO NO CHECK TR401, TR 402, L401, L416.
TLA 852/FLA 872 Table 5.1: Radio Board DC Voltage Levels COMPONENT COLLECTOR TR401 0.29 0.73 0 RF Amplifier TR402 0.87 1.02 0.29 RF Amplifier TR403 0.845 0.678 0 First Mixer TR404 0.733 0.015 0 AGC Switch TR406 1.018 0.791 1.4 1V Series Regulator TR410 0.95 0.937 0.264 First Local Oscillator TR415 1.4 - 0 Beep Enable TR416 1.4 - 0 Transducer Driver NOTE: BASE EMITTER COMMENTS All radio board measurements were taken with the receiver turned on.
TLA 852/FLA 872 Table 5.3: Decoder Board DC Levels DEVICE COLLECTOR BASE EMITTER REMARKS TR1 3.00 3.00 1.4 Battery Disconnect Monitor TR2 - 3.00 1.4 Backlight Driver TR3 1.4 - - Vibrate Enable TR4 1.4 - - Vibrate Motor Drive 0.19dc 2.2 V p-p C5 R1/C4 4ms wide XL2 4.19MHz 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 (pin 2) 1.
TLA 852/FLA 872 VOLTS 2.2V 0.19V 4ms TIME WAVEFORM AT C5 VOLTS 3V 4.19MHz WITHIN THE ENVELOPE 4ms TIME 0V WAVEFORM AT R1/C4 3V p-p 38kHz VOLTS 1.49V 0V TIME WAVEFORM AT R35 AND IC402, PIN9 TAG11333-1 Figure 5.
TLA 852/FLA 872 VOLTS 3V p-p VOLTS 0V 0V 3V p-p TIME 1.6ms 1.6ms WAVEFORM AT PIN 38 TIME WAVEFORM AT PIN 39 VOLTS 6V p-p VOLTS 0V 0V 6V p-p TIME 1.6ms WAVEFORM AT PIN 40 VOLTS 1.6ms TIME WAVEFORM AT PIN 41 3V 0V TIME 1.6ms WAVEFORM AT PIN 45 TAG11132-1 Figure 5.
TLA 852/FLA 872 33 48 C 32 49 B E µP TR2, 4 TR401, 402, 403, 406 407, 410, 414 IC3 3 (C) 64 1 (B) 17 1 2 (E) 16 TR1, 3, 415 (1) 22 21(28) ( ) 1 IC4 SONY LCM 28 1 (Rear of Module) (NEC CONFIGURATION ) (IS SHOWN IN PARENTHESIS) ( ) (14) 7 8 (15) 51 1 1 8 A0 TEST IC1 A2 SCL VSS SDA 4 5 1 SIGNAL XVSS XT XTN VSS 5 OUT VDD ATTN SDI SDO SCK AREA RSTN CLKO BS2 BS3 VCC A1 16 BS1 IC402 9 8 NC IC5 1 Vdd IC6 Vss 3 4 NC 24 OSC BASE RF IN OSC EMITT GROUND MIXER O
TLA 852/FLA 872 Table 5.
TLA 852/FLA 872 Table 5.
TLA 852/FLA 872 Table 5.
TLA 852/FLA 872 5.8 RADIO ALIGNMENT PROCEDURE 5.8.1 Preparation a) Remove the Board Assembly from the Case (see paragraph 5.5.2). b) Install a 0 ohm resistor or a shorting link in the position for R456, to disable the BEC. c) Disable the AGC circuit by connecting TP403 to 0 volts. Alternatively, lift R409. SIGNAL GENERATOR 1kHz MODULATION INPUT AUDIO OUT RF IN HF COUNTER SINAD METER 455kHz OSCILLOSCOPE P671A 10dB ATTENUATOR Figure 5.11: Radio Alignment Test Equipment 5.8.
TLA 852/FLA 872 e) Put a known good battery in the unit (but leave the battery door off). Put the unit in the P671A jig, fold the jig arm over the unit and lock the arm in position. f) Connect the SINAD meter 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 -98dB should be achieved. NOTE: h) Do not disturb the aerial during the next operation.
TLA 852/FLA 872 5.8.3 Pager Sensitivity Measurement (Coarse) To determine the pager sensitivity, configure the test equipment as shown in Figure 5.13 and do the procedure given in sub-paragraphs a) through e). NOTE: This is only an indication of sensitivity,which is dependent on the unit under test being in a noise free environment. P645 PC NOTE: DATA SIGNAL GENERATOR THE DISTANCE BETWEEN THE PC AND THE P671A MUST BE GREATER THAN TWO METRES RF IN 10dB ATTENUATOR TAG11331-1 Figure 5.
TLA 852/FLA 872 20mm + + + + 60mm 20mm 14mm 52mm 80mm ø 5mm 20mm TAG11124-1 Figure 5.
TLA 852/FLA 872 5.9 PROGRAMMING 5.9.1 General The pager contains an EEPROM which holds unique data. The data may be altered as shown in the following paragraphs. 5.9.2 Equipment The following equipment is required: 5.9.3 ! P671A Alignment Jig ! P669H Programming Software ! Programming Cable ! IBM PC or equivalent Procedure Program the receiver as follows: a) Remove the Battery Door from the Case Back.
TLA 852/FLA 872 SECTION 6 SPARE PARTS LIST CONTENTS: Page 6.1 6.1.1 6.1.2 6.1.3 6.1.4 ASSEMBLIES Modules Case Parts Batteries Battery Packs 6-1 6-1 6-1 6-2 6-2 6.2 6.2.1 6.2.2 6.2.3 6.2.4 6.2.5 6.2.6 6.2.7 RADIO BOARD COMPONENTS Capacitors Banded Capacitors Crystal and Filters Inductors Resistors Semiconductors Miscellaneous 6-3 6-3 6-3 6-4 6-4 6-4 6-5 6-5 6.3 6.3.1 6.3.2 6.3.3 6.3.
TLA 852/FLA 872 ITEM/CIRCUIT REFERENCE 6.1 PART No. FREQUENCY BAND INFORMATION BAND 1 BAND 2 BAND 3 BAND 4 BAND 5 BAND 6 138.000 143.500 149.000 155.000 161.000 167.500 6.2 ASSEMBLIES 6.2.1 Modules 6.2.2 DESCRIPTION - 143.499 MHZ 148.999 MHZ 154.999 MHZ 160.999 MHZ 167.499 MHZ 174.
TLA 852/FLA 872 ITEM/CIRCUIT REFERENCE 6.2.3 DESCRIPTION PART No. BATTERY CONTACT +VE BATTERY CONTACT -VE SPRING LANYARD (ELASTICATED) GASKET, DISPLAY SEAL SPACER MOULDING RUBBER VHF 7361-4862 7361-4861 7961-5055 2561-5007 0861-5209 SCREW 2.2mm x 6mm PAN HEAD, S/TAP 8216-2296 Miscellaneous 6.3 RADIO BOARD COMPONENTS 6.3.1 Capacitors 6.3.
TLA 852/FLA 872 DESCRIPTION PART No. DESCRIPTION PART No. 1p ±0.25% 50V 3p9 ±0.25p 50V 4p7 ± 0p25 50V 6p8 50V 8p2 50V 10p ±0p5 50V 3326-0015 3326-0010 3326-0011 3326-0013 3326-0014 3326-0015 12p ±5% 50V 15p ±0p5 50V 18p ±0p5 50V 100p ±5% 50V 3326-0016 3326-0017 3326-0018 3326-0027 LINK (RES CHIP 0S) 3115-0001 ITEM/CIRCUIT REFERENCE 6.3.3 DESCRIPTION PART No. FL401 FL402, 403 FL402, 403 FL404 CRYSTAL FILTER 21.4MHz CERAMIC FILTER, SMD, 10/12.
TLA 852/FLA 872 6.3.5 6.3.6 6.3.7 DESCRIPTION 100n ±5% 270n ±5% 330n ±5% 390n ±5% 470n ±5% 560n ±5% PART No. 4103-0254 4103-0264 4103-0266 4103-0268 4103-0270 4103-0272 ITEM/CIRCUIT REFERENCE DESCRIPTION PART No.
TLA 852/FLA 872 ITEM/CIRCUIT REFERENCE DESCRIPTION 6.4 DECODER BOARD COMPONENTS 6.4.1 Capacitors C3,6,8,10,14,19,20-25 C4,5 C9,11 C12,15 C13 C17,18,26 C 28 (FLA) C 29 (FLA) 6.4.2 6.4.3 PART No.
TLA 852/FLA 872 6.4.4 Banded Component: IC3 TLA 852 STANDARD (LATIN) 0501-0224 0501-0211 (OTP) 3835-0017 (MASKED) STANDARD (CYRILLIC) 3835-0012 0501-0212 (OTP) 3835-0018 (MASKED) "ZAP!" (MASKED) 3835-0020 Z-PAGE 0501-0228 MOROCCO 0501-0198 (OTP) 3835-0010 (MASKED) ITEM/CIRCUIT REFERENCE 6.4.5 FLA 872 DESCRIPTION PART No.
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TLA 852/FLA 872 SECTION 7 DIAGRAMS CONTENTS Source Drawing Page 7.1 Radio Board (PCB 3061-5374 Iss. 1) Circuit Diagram (Sheet 1 of 2) 2961-5375 Iss. 5 (Sheet 2) 7-3/4 7.2 Radio Board (PCB 3061-5374 Iss. 1) Circuit Diagram (Sheet 2 of 2) 2961-5375 Iss. 5 (Sheet 1) 7-5/6 7.3 Radio Board (PCB 3061-5374 Iss. 1) Component Layout - Side 1 0261-5373 Iss. 2 (Sheet 1) 7-7/8 7.4 Radio Board (PCB 3061-5374 Iss. 1) Component Layout - Side 2 0261-5373 Iss. 2 (Sheet 2) 7-9/10 7.
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