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Ericsson LBI-31629B User's Manual

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1. er cto ras ka C3 635 Licas 1033 ea L Jes 632 28 529 ce 7 66 Les c c4 c2 LN LBI 31629 Controller Board A4WE04023 LBI 31629 SCHEMATIC DIAGRAM SWITCHES SWRO SWRI SWRZ SWR3 SWRS SWRE SWRT SWECO SWCI Swe 03 O35 03 Q3 O37 O33 CPit 14 SWITCH MATRIX 40 aha 004 100k 100K 00 n RIT RI C8 oe RIG Ct sok CZ e ce cs c cT ROS ml 100 244 4 Fos PH MA 10K BATA 1 4 ox A Q 7 AMELE I2 3 T 33 O A6 look f er SIGNALLING BOARD E CLK 2 STROBE gt OATA gt ENABLE gt L pg gt TONE gt T TONE cp gt TONE OUT INT DISC z lo 1 le gt 07 T D gt la gt 24 14 sl 23 ol 2 895 Ree DUM BUSY DISPLAY 190 LATER d BOARD PHA 909 c a o H ufo CR B LIGHT ORE STROBE O EXT o 0 0 ut Busy s GNO mo iT 86 6867 3 lt SPK R73 2 FIG 4 47 47 H k POR 68 97 7 A uh BATTERY O d lors 6 PU C17 cr ez2 eza c2 BATTERY t ate VAL RTA lt ceo 2 M
2. R32 BAND SWITCH 47k 06 y mr UNE ic 6 02 crai C318 5 1 65 5 C320 638 1 757 BATTERY 180 417p _ 2 RI29 m 42 1000 T gt a Gam tl Tx AUDIO cras 4 05 l JA gt E e i RIAS h Co NT 7 C33 47k T fa d az a Gea X TYPICAL VOLTAGE AT LOWEST CHANNEL RADIO SCHEMATIC DIAGRAM WITH TYPICAL VOLTAGE A4WE03739 40 16 m OD spit gt T e 20 21 30 31 40 Is gg Ne 29 Jn C47 21830 s R96 7 L1 D E 8 O 6 858 392 es CJ 986800050 x ERIT All 00 Bs Ghi m a gt o e e e J rd 0800008 198 1659 L 0 OUTLINE DIAGRAM 000 z 522 23071 5 iza nh Jozi D 2 oy COMPONENT SIDE A6 A3 39 29 A1 A2 7 17 SOLDER SIDE en _ 9999 n 3 E A3Z02813E Oo R118 2 002 P102 BTI BT1 D cea 0i LJ Dem 2 ea d TU ERI R95 1 asl Crs csi R92 RS Li Ol 889 m C3 LJ R93 Cl us 5 1 RD C R5 at jw BU mo LJ Dh R2L R19 L R9 fa R18 e
3. 1 5 RETRO ees ee wha eue e quee Battery Packs 5 525 gu dt te WS gi set vet eed anat a babe web Bona vue MECHANICAL PARTS BREAKDOWN 2 2 PARTS LISTS Radio Chassis s uibus s dota es Pedo em OS eee Mechanical atu ml EAE ES a S Ed bea Nu heh eon d e gods Radio Board ou Rb REN RE PAD eee ea dub Wurde Controller Board r ok iced S be che miu ie dines dus Signaling Board ye hk ea SAE LCD Boatd eee of ee eet eb Beet es us Copyright April 1987 General Electric Company SYSTEM Frequency Range 136 MHz to 160 MHz 150 MHz to 174 MHz Frequency Stability Battery Drain at 7 5 VDC Standby Receiver Rated Audio Transmitter Dimensions H x W x D With Standard Capacity With High Capacity short Battery With High Capacity long Battery With Extra High Capacity Battery Weight With Standard Capacity Battery With High Capacity short Battery With High Capacity long Battery With Extra High Capacity Battery Operable Temperature Range TRANSMIT Power Output Spurious Emissions Maximum Deviation FM Hum amp Noise Audio Distortion 60 MOD Frequency Stability 30 C to 60 C RF Load Impedanc
4. The VCO uses a low noise high gain transistor as the ba sic oscillator The resonant circuit which determines the frequency of oscillation is formed by a High Q coil which is used to set the center frequency at the factory The output of each VCO TX and RX is coupled into a cascade amplifier which produces 3 dBm The output of the RX VCO ampli fier is coupled into the receive first double balanced mixer circuit A301 through buffered amplifier Q106 The TX VCO amplifier output is directly connected to the TX Amp input through attenuator circuit R201 R202 and R203 VCTCXO Reference Oscillator A103 The A103 oscillator module is self contained fully tem perature compensated and operates at a frequency of 13 2 MHz The oscillator also has modulation capability Fre quency is adjusted by a trimmer while monitoring the trans mit circuit output at the antenna jack 7 LPF TX RX CONTROL 9105 Figure 9 Synthesizer LBI 31629 CONTROLLER CIRCUIT This controller circuit consists of control circuits and audio circuits Physically this circuit consists of three cir cuit boards as follows Control Board e Signaling Board e LCD Board Control Board The Control board consists of the following circuits see Figure 2 CMOS Microcomputer A1 RAM with Lithium Battery A2 plus BT1 Audio Processor A3 Audio Amplifier A4 A6 Voltage Regulator Circuits A7 A9
5. Needlenose pliers Allen head wrench for removing set screws Pencil type soldering iron 25 40 Watts with a fine tip Step 1 To gain access to the radio loosen but do not remove the four captive screws shown at and B Carefully re move the back cover For normal radio alignment the back cover is all that needs to be removed When tightening the captive screws they should be no tighter than 4 0 5 inch pounds See Figure 12 Step 2 To remove the Radio Board unscrew and remove the an tenna at and RF connector at D Remove the six Screws at E using the Phillips head screwdriver The radio portion can now be detached from the rear cover See Fig ure 13 Step 3 Remove the shield cover P from the eggcrate See Figure 14 Step 4 To remove the antenna changeover switch remove the tap screw at using the Phillips head screwdriver Unsol der the antenna switch lead connection at H 1 The antenna switch assembly can now readily be removed by hand See Figure 15 Step 5 To remove the Controller Board remove the five screws at from the Controller board Use the Phillips head See Figure 16 Step 6 Unplug the LCD control flex circuit at J from the con nector at The Controller Board can now readily re moved from the LCD board See Figure 17 Step 7 To remove the LCD Board pull the contact Pins at D out of the socket in the MIC flex circuit
6. Q2 Q3 Q10 and Q11 External Data Buffer A5 Microcomputer A1 The microcomputer provides various software for con trolling the radio unit as follows Loading data to the frequency synthesizer Fetching and processing the PTT monitor channel se lection and volume control Loading data to the LCD display Controlling the audio circuit Processor Encoding decoding the Channel Guard and digital Channel Guard Controlling the loading interface for the radio data channel number and signaling RAM A2 RAM has a capacity of 2K bits X 8 for storing various data for controlling the radio The data is entered from the outside to the microcomputer through the UDC connector and then to the RAM The data mainly consist of the follow ing Channel Frequency Data CG DCG data e TX Power TX Modulation Data e Squelch Data Display Data etc Audio Processor A3 The Audio processor consists of a one chip IC accommo dating almost all of the audio functions The audio functions are under control of the microcomputer in compliance with the function of the radio unit The functions of the audio processor are as follows Tone Reject Filter Limiter Amplifier Volume and Modulation Level Control Post Limiter Filter e Squelch Filter and Rectifier e CG DCG Encode Decode Filter and Limiter D A Converter and comparator e OSC Circuit and Digital Interface for Microcomputer of these
7. X19 2CCF004102 K19 28HA44010202 19 2940001026 19 204 0001034 K19 2RGC001734 19 2 001627 K19 2RGC001528 K19 2RGC001648 K19 2RGC001528 K19 2RGC001544 K19 2RGCO01700 K19 2RGC001601 K1972RGC001726 K19 2RGC001635 K19 2RGC001569 KX19 2nCA005020 K19 2PDA023143 DESCRIPTION Ceramic chip 1000 pF Ceramic chip 0 047 uF Tantalum 0 47 uF Tantalum 1 uF Silicon 28411218 Silicon 28C2462LCTL RESISTORS Square chip 1 10W 180 K ohm 5 Square chip 1 108 10 ohm 5 Square chip 1 10W 100 ohm 5 Square chip 1 10 100 ohm 5 Square chip 1 10W 100 ohm 5 Square chip 1 10W 220 ohm 5 Square chip 1 108 1 5 ohm 5 Square chip 1 10W 3 3 ohm i5 Square chip 1 108 47 ohm 5 Square chip 1 108 22 K obm 5 Square chip 1 10W 470 ohm 5 Minisert 76693 001 COMPONENTS ADDED DELETED OR CHANGED BY PRODUCTION CHANGES SYMBOL GE PART NO K19 2ADA004404 19 2448004292 19 2 004135 X19 2CCP004102 K19 2CAK013101 K19 2CAK013044 K19 2CAK005818 K19 2QBE005032 K19 2PDA023 143 K19 2RGC001585 K19 2R6C001643 K19 2RGCO04472 K19 2RGC001742 K19 2RGC004480 K19 2RGCO04407 K19 2RGC004316 K19 2RGC001627 K19 286C001825 19 286 001627 19 2 0 001775 K19 2RGC001627 K19 2RGCO01627 K19 2RGCO01833 K19 2RGC001643 19 2 44181645 COMPONENTS ADDED DELETED OR CHANGED BY PRODUCTION CHANGES PARTS LIST SIGNALING BOARD A4
8. gt N dies zm g R15 SERES erc o gt cre PR Qe s Suges o gt p hr 8 e LCD Board A4WE03737 20 FROM 70 CONT BOARD Sw co Sw SW c2 Sw RO N SW GND 5 4v STROBE DATA BUSY LIGHT AUDIO our BATT OUT PTT Tx DATA Rx DATA CTS UDC T R MUTE EXT Mic EMER DISC OUT MIC IN MIC GND SPKR HI SPKR 40 CONT SCHEMATIC DIAGRAM LBI 31629 000P 1000P 1000P CL NI FROM TO KEY PAD 1 GN ll ES say 7 ___ _____ 5 ma smosE 8 As UPD 7225G 2 m DISPLAY DRIVE f R 7 DATA RX DATA CTS UDC T R MUTE EXT MIC IN EMER DISC OUT COM FROM TO UDC MIC IN MIC GND SPKR HI SPKR LO CONT BATTERY CONNECTOR From INTERNAL MIC gt INTERNAL SPKR amp CONNECTOR LCD 1 Board A4WE03737 21 LBI 31629 SCHEMATIC amp OUTLINE DIAGRAM GROUND VENT HOLE SPKR MUTE SHORTING SPRING SWITCHED B CONTINUOUS B TOP VIEW TYPICAL SCHEMATICS RADIO CHARGING CONTACTS CONTACTS BATTERY PACK RADIO SUPPLY SWITCHED lt CONTINUOUS B CHARGE BT1 SPKR MUTE SHORTING T THERMAL CONTACTS Eok SENSE 25 C GROUND 2146 Battery Pa
9. 0 244 Op UPC1251BG K19 2CAK009109 Ceramic chip 12 pF 5 50V 1 PD4066BG K19 2FAA103041 4 01308 0 K19 2CAK009208 Ceramic chip 1000 pF 10 50V X19 200KLK3551 VCO A4WX01391 4 1 KLH3552 150 174 MHz ur UP Japan K19 2FAA103058 A4WX01307 K19 2RGCO03383 Square 1 168 4 7 ohms 5 eramic chi Mode K19 2FAD001242 455 18 286 003045 Square 1 16W 150 ohms 5 K19 200KLH3552 VCO A4WXO1391 84 2 KLH3531 136 160 MHz i 10 19 2 009208 Ceramic chip 1000 pF 10 50v X19 2RGC003045 Square 1 16W 150 ohms 5 K19 200KLH2592 Gain Hybrid KLH2592 K19 2RGCO03110 Square 1 168 ohms 5 4WX01422 1H 150 K19 2AAA013112 Pack A4WXO 0 174 MHz 19 2 04023036 69775 005 5 K19 2CAK009398 Ceramic chip 11 pF 5 50V X19 2RGC003328 Square 1 16W 10 ohms 5 2 1L 136 K19 2AA4013104 Pack A4WX0142 136 160 MHz K19 2PDA023044 69775 011 7 K19 200KLH8516 PWR Cont KLH8516 rhe Rerento K19 2RGCO03094 Square 1 16W 470 ohms 5 19 2 009398 Ceramic chip 11 pF 5 50V K19 2EDG002028 Mixer UST 2L A4WXO1376 K19 2CCF004086 Tantalum 1 uF 167 K19 2LAA001149 FL3HR68M X19 2RGCO03334 Square 1 16W 22 ohms 5 K19 2AAJ008089 IF 12442 K19 2CA4K009208 Ceramic chip 1000 pF 10 50V 19 2 0 001014 44WX01364 CAPACITORS K19 2LADO01112 8L322522T 068M K19 2RGCO03094 Square chip 1 16 470 ohms 5 K19 2CCF004086 T
10. Captive Screws Captive Screws Rivets Housing Gasket RF Connector Gasket Insulator Label COMPONENTS ADDED DELETED OR CHANGED BY PRODUCTION CHANGES 24 SYMBOL GE PART NO K19 A4WLO7655 K19 A4WLO7656 X19 448L07727 NOT USED NOT USED NOT USFD NOT USED NOT USED K19 A3WLO7897 K19 A38L07895 K19 A38L08505 K19 A38LO8833 K19 A3WLOB8837 K19 A38L08834 K19 A3WLOBS35 K19 A3WLOBB93 K19 A3WLOS6985 19 1 08696 NOT USED 19 4491 08088 19 44 1 08409 K19 A48LOB385 NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED K19 A4WLOB827P1 K19 A448L08828P2 K19 A4 L08827P2 K19 A4 L08827P3 X19 A48L08828P3 K19 A4VL08827P4 K18 A4WLOB827P6 K19 A4WLOB8827P6 K19 44WLOB828PT K19 44VLO8827P5 X19 44WLO8827P8 NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED NOT USED K19 44WL07S09 X18 448L08437 19 449108438 K19 A4WLOT7595 K19 A4WLO8730 K19 A4WLOBA94 K19 A48LOB628 K19 A4WLO8628 K19 A4WLOBG30 K198 A48LO8673 19 437108672 K19 A4WL08829 K19 A4WL08830 X19 A4WL08832 K19 A4WL08495P1 K19 A4WLOB485P2 K19 A4WLOBB31P1 K19 AAWLO8831P2 K19 A4WL08831P3 K19 44WLO8802 19 4491 08698 K19 A4WLO7883 K19 A42L05484 19 44 1 08802 DESCRIPTION ANT Switch Spring B ANT Switch Spring Shield Plate Controllor P W Board LCD P W Board Signal P W Board LCD Cont Flex Circuit Top Flex Circuit SYS UCD PTT Flex Circuit SPKR MIC Flex Circuit Tx Rx P W Board UHF Tx Rx P W Board
11. ELECTRIC HIGH CAPACITY BATTERY Standard STANDARD CAPACITY PDPA10 Optional BELT CLIP PDHC15 1 CARRYING CASES WITH BELT LOOP PDHC11 PDHC12 WITH SWIVEL MT SHOULDER PDHC13 STRAP PDHC14 PDHC18 HEADSET MIC EAHPIECE PDAB10 SPKR MIC 2 FDAGIQ PDAE 10 Re EES guid g 38 GE STAR LANYARD INTERFACE CONNECTOR PDAC12 Code Range d H 150 174 MHz all ill DESCRIPTION TOP VIEW ANE Provided with PDAB10 TOP VIEW oA Ericsson GE s M PD System Personal Radio is a high quality high performance two way FM communications unit consisting of a transmit receive circuit with a frequency syn thesizer controlled by a microprocessor The M PD Personal Radio is ideal for use in public services by providing the fol lowing features 48 Channel Capability Channel designation can be a FRONT V V T MULTI CHARGER H2A2L2A 121 VAC 16 HR H2A2J1A 121 V
12. The radio reverts to the priority level channels should any activity occur on those channels There are two levels of priority The first priority channel takes precedence over the second priority channel and the second priority channel takes precedence over the user selected channel Manual High Low Power Selection If programmed into the radio the user will be able to manually select either high or low RF power output through the front panel keyboard Physically an M PD radio consists of three printed wire board assemblies and a battery pack as follows a A printed wire board specially shielded with zinc alloy on which the radio assembly transmit re ceive synthesizer is assembled b A Logic control board containing the microproc essor c A Display board carrying various display and in dicating circuits d A battery pack that fits the M PD main unit e Light weight metal front and back housing Radio Assembl Transmit The transmit circuit is made up of four major circuits as follows a Wideband Hybrid Exciter Amplifies the signal from the frequency synthesizer with about 21 dB gain b Wideband Power Amplifier Amplifies the out put signal of the exciter 13 dB to 18 dB to the desired output level for transmission c Wideband Power Control Hybrid IC Can re duce the transmitter output level by 10 dB d Output Low pass Filter LPF Consists of a three stage LPF to eliminate higher harmonics
13. VHP Tx Rx P W Board 800 MHz Adhesion Sheet Rubber Sheet MIC Film Flush Head Screw M2 6 x 3 Pan Head Tapping Screw M2 Pan Head Screw M1 7 x 4 Head Screw with SW M2 Head Tapping Serow 2 Head Screw with SW M2 Head Screw with SW M2 Head Screw M2 x 4 Head Tapping Screw Head Screw with SW Head Screw with SW Front Sheet Window Sheet STD Rubber Plate Shield Cover Mylar Washer VCO Rubber Base Shield Spring Contact Lug C Base Contact Window Gasket Base P W Board RF Spring RF Spring B RF Spring Plate 800 MHz only Connector Spacer Connector Spacer B RF PWB Contact A RF PWB Contact B RF P B Contact C Nylon Washer Tracking Data Label Power Pack Bracket Crystal Protection Tube Nylon Washer PARTS LIST SYMBOL 133 134 135 136 137 138 139 140 141 142 GE PART NO K19 A4WL08710 K19 A4 L09709 NOT USED K19 44WL08848 K19 A48L09711 K19 A4 L00712 19 44 1 09046 NOT USED K19 448L09422 K19 A48L09662 DESCRIPTION Yellow Label For Cont P B Yellow Label For Signal P B RF Connector Washer LCD P B Washer LCD P B Spacer Cap Coil Spring PTT Spacer PARTS LIST LBI 31629 PARTS LIST SYMBOL GE PART NO DESCRIPTION SYMBOL GE PART NO OESCRIPTION SYMBOL GE PART NO DESCRIPTION K19 2CAK009208 Ceramic chip 1000 pF 10 50 VHF M PD PERSONAL RADIO RP BOARDS K19 2RGCO03177 Square chip 1 16W 10K ohms 5 K19 2CCF004086 Tantalum 1 uF 1
14. antenna 2 or the RF test connector 4 In its receptacle A clockwise turn will insert the antenna or RF test connector while a counter clockwise turn will remove them Slide the battery pack along the bottom of the M PD main unit from the arrow marked direction shown in Figure 1 until the battery pack locks into place Operating Procedure Refer to Figure 1 To Receive a Message 1 AN Slide the Power switch B on the side of the battery pack up to turn on the radio Select a desired channel within a selected mode by pressing the A mark side or W mark side of the CHAN switch 6 while watching the indicaion in the display window An operating channel may also be selected by pressing the CHAN key on the front keypad Pressing this CHAN key displays the current oper ating channel To select a different channel key in the channel number then press the CHAN key The display will indicate the new channel name or number and update the display flags An operating mode may be selected by pressing the MODE key also located on the front keypad Pressing the MODE key displays the current mode To select a different mode key in the desired mode number then press the MODE key The new mode will be displayed To monitor the channel for idle or busy watch for the BSY symbol to be illuminated in the display or audibly monitor the channel by simultaneously depressing both the and Y volume buttons Display
15. as required The top keypad is not protected in this manner for ease of using the frequently switched functions volume channel Signaling On Off etc Two Tone Sequential Encode Decode Selective call ing encode decode or encode decode is enabled or dis abled on each individual channel Three simultaneous unique decodes are available for each channel to allow large systems the capability for individual and group calls Compatibility with Channel Guard Digital Channel Guard GE STAR Dual Priority and Scan are maintained Various audible alerting signals are avail able on choice when programming the radio DTMF Encode Reperatory Dialing When enabled by the information programmed into the personality of the radio the DTMF encode function can be used by either manually dialing from the keypad or by recalling a com plete number stored in memory Ten stored numbers in cluding the last number dialed up to 16 digits are easily recalled to the display for viewing A convenient display overflow and shift mechanism is incorporated into the display control procedure It is not necessary to press the PTT switch while dialing Features needed for overdialing autopatch and paging terminals including programmed delays pauses and the generation of the and DTMF pairs are included Programmable Dual Priority Scan The radio is pro grammed to listen to a selected channel while scanning back to two priority channels
16. audio circuits Power Supply The M PD battery pack connects to the bottom of the M BPF and an IF amplifier to get the desired first IF signal c Second IF 455 kHz Consists of one IC and one BPF containing the second mixer second IF amplifier and FM detector The second IF output provides the Logic section with audio output Frequency Synthesizer The frequency synthesizer is made up of three major modules as follows a VCO Module The VHF band frequency syn thesizer has two VCO s one for transmitting and one for receiving The transmitter is modulated at both the VCO and the VCTCXO PD radio to supply 7 5 Volts DC to the unit The battery packs are available in three capacities standard high and ex tra high To charge these battery packs charges are available in three different styles a desk charger a wall mount multi charger and a vehicular charger OPERATION The M PD Personal Radio is delivered disassembled into three parts 1 M PD Radio Main Unit 2 Antenna 3 Battery Pack LBI 31629 Assemble these parts into one unit according to the fol lowing procedure and as shown in Figure 1 M PD Operat ing Controls and Accessories NOTE Either the antenna or the RF connector should be connected to the M PD radio main unit as desired If the RF connector is inserted in the receptacle located in the side of the unit the an tenna connector circuit will become open Screw the
17. chip 0 01 uF 50 R58 K19 2RGCO01817 Square chip 1 108 33 ohm 5 Ki9 s800001728 Square chip 1 10W 4T K 158 19 2940004103 PNP 28B798TIDL K19 2RGC001635 Square chip 1 10W 22 ohm 5 258 R59 X19 2R6C001543 Square chip 1 108 100 K onm 5 a Pu K19 288C001843 Square chip 1 10 100 K ohm 55 K19 2CAK005511 Ceramic chip 0 1 uF 25 WV q ls s iis agipooiUd pu R60 K19 286C001825 Square chip 1 10W 220 ohm 5 K18 2CAK Ceramic chip 0 01 uF 50 WV VERANO 4 R61 K19 2RGC001502 Square chip 1 10W 10 ohm 54 96 Ki9 2q4D004095 PNP 28B824T1BBV3 t K19 2CCP004102 Tantalum 1 uF 15 WY i K19 2RGC001585 Square chip 1 10W 1 ohm 95 19 294 001034 NPN 25C2462LCTL 262 K19 2R0C001643 Square chip 1 10K 100 K ohm 5 K19 2CCF004185 Tantalum 0 22 uF 50 WV p 7 K19 2RGC001726 Square chip 1 10W 47 K ohm 5 98 K19 2QAD004095 PNP 25862411 R83 Ki9 2RGC001627 Square chip 1 109 10 ohm 5 K19 2CAK011188 Ceramic chip 0 01 uF 50 WV K19 3RGC001643 Square chip 100 K ohm 5 89 19 2040001034 NPN 25 24621 R84 K19 2RGC001833 Square chip 1 10 2 2 ohm 10 K18 2CCF004102 Tantalum 1 uF 15 WV Sic RUBBER BUMPER K19 2QAD004095 PNP 28 824 1 ad aes K19 2NGC001932 Square chip 1 10 100 ebm 1 19 2 2001062 911 K19 2CAK011253 Ceramic chip 100 pF 50 WV 912 K19 2QAD001034 NPN 28c2462LCTL K19 2CAK011188 Ceramic chip 0 01 uF 50 W
18. 13 1 22 0 07 E P UT C323 d N are 4 CS 121 C128 3 R136 L1 pening C216 m 40 9106 R2000 CI SH ge o i 1 d 9 C205 C208 Vis IE ci RE C228 C207 LBI 31629 RADIO BOARD A4WE03739 40 LBI 31629 SCHEMATIC DIAGRAM C22 C223 C224 HP P P ANT GD 201 1000P 120 Lzo4 1 205 1 TEST POINT L20 cas 4 ce s 2 amp e7P 2 12 7 01 L201 ee fi Tx 5 4 5 i 20 i 4 er BI CR202 Rx AUDIO 7 AUDIO 75V BATTERY 2 PWR SET gt 0 01 22 m C302 2702 L302 STROBE 1222 FL30 63067 FL302 jase lt 030 M DATA 12 6 Wr QUT x NN 100P GH r302 2303 ENABLE 303 qe esc C312 25 3356 god es 2 P Ud 33 56 12P cag ctor 47 j5P cy GID D LOCK DET ESSE 3PF 120P ae a RIM R 30 De ih 7 Gat K Eis 3024 55 A302 MD 5 4 REG 2 0 224 p 35 e 10 10K 1000P zs crt R3IZ e on CP Loe ll eae Up CONT LINE I E 55007 7 Sh K rti ger KEDIP ied 2 Tum RIO 00K 8 2 e 33oP 2 NC Be LE 25 58240 4 or cer 7 gros AD DE 1307 5 i j Gam 47K R120 250596
19. 2 Antenna If BSY If BSY lights it means that the channel BSY is busy 4 Adjust the audio volume to the desired level by pressing the A mark side to turn the volume up or the W mark side to turn the volume down of the VOL switch 5 As the VOL switch is operated the indication in the display window changes 1 through 31 about 45 dB The volume level cannot be set lower than the level programmed in the mini mum volume option 10 1 Main Unit To Send a Message Hold the radio so that the antenna is vertical Then press the Push to Talk PTT bar 9 on the left side of the main unit an speak directly into the microphone in a clear and dis tinctive voice Always release the PTT bar as soon as you stop talking 4 RF Tesi Connector t Option Upon pressing the PTT bar an indication will appear in the display window n Lights while you are speaking Lights for high power TX HI NOTE The M PD unit is provided with an optional timer which inhibits continuous transmission beyond about 12O seconds When transmission is inter rupted due to time out you can resume transmis sion by releasing and then pressing the PTT bar again NOTE To Make a Telephone Call Pressing the PTT switch or any other button on either key pad turns on the LCD back lighting which will remain on for a pre programmed period of time You can make
20. 331 Ceramic chip 4700 pF 10 507 K19 2LAD001062 MLP3216DiROK K19 2RGC003243 Square chip 1 168 150K ohms 5 K19 2CAK009034 Ceramic chip 3 pF 0 25 pF 50Y 19 2 009182 Ceramic chip 100 pP 5 50V 419 2RGC003045 Square chip 1 16 150 obms 5 19 2 009216 Ceramic chip 0 01 uF 10 50 19 2 034121 Electrolytic 22 uF 16V K19 9LAD001021 MLF32160R68K K19 2RGC003144 Square chip 1 16 3 3K ohms 5 K19 2CAK009218 Ceramic chip 0 01 uP t10 507 19 286 003201 Square chip 1 16 33K ohms 5 19 2 009125 Ceramic chip 15 pF 5 50V K19 2CDA055016 MET POLY PROP Film 0 56 uP 50V X19 28GC003177 Square chip 1 168 LOK obms 5 19 2 004086 Tantalum 1 16V K19 2QAD004020 2503356822 K19 2CAK009034 Ceramic chip 3 pP 0 25 pF 50V 18 2100003094 Square chip 1 16W 470 ohms 5 19 20 0004087 28B8624BV3 K19 2CAR009331 Ceramic chip 4700 pF 10 507 K19 2RGC003342 Square chip 1 16W 47 ohms 5 K19 2CAK009190 Ceramic chip 330 pF 5 50V K19 2QAD004046 2805960 3 K19 2CAK009018 Ceramic chip 1 pF 0 25 pF 507 19 28 003261 Variable GFO4 100K ohms K19 3CAK009166 Ceramic chip 47 pF 5 50V K19 2CAX009059 Ceramic chip 5 pF 0 25 pF 50V K19 286C003193 Square chip 1 16W 22K ohms 5 K19 2CAK009208 Ceramic chip 1000 pF 10 50V K19 2QAD001133 28C26209C K19 2CAK009216 Ceramic chip 0 01 uF 10 507 K19 294D004053 280999 19 2948015077 28 1169 K19 2LAB014893 A4WX01333 X19 2CAX009208 Cer
21. 629 FRONT COVER REAR COVER REAR COVER BATTERY PACK Figure 11 Disassembly Figure 13 Disassembly Step 2 Tx Rx PW BOARD REAR COVER FRONT COVER EGGCRATE Figure 14 Disassembly Step 3 Figure 12 Disassembly Step 1 10 LBI 31629 LU CONTROLLER PW BOARD LCD PW BOARD Figure 17 Disassembly Step 6 SP MIC FLEX CIRCUIT Figure 16 Disassembly Step 5 LCD PW BOARD Figure 18 Disassembly Step 7 LBI 31629 IMPORTANT NOTICE DO NOT USE FRICTION PAD KIT ON RADIO UNITS WHICH WILL BE USED IN VEHICULAR CHARGERS APPLICATION OF PADS AS SPECIFIED MAKES THE RADIO HOUSING UNSUITABLE FOR USE IN VEHICULAR CHARGERS DUE TO LIMITED CLEARANCE IN CHARGER POCKET THESE INSTRUCTIONS COVER THE INSTALLATION OF FRICTION PAO KIT 19470558501 MOUNTING SURFACES OF HOUSING TO BE CLEAN DRY ANO FREE OF GREASE SURFACE MAY WIPED CLEAN WITH ISOPROPYL ALCOHOL CAUTION avoio CONTACT OF CLEANING LIQUIDS WITH PLASTIC PARTS OF RADIO ASSEMBLY REMOVE PROTECTIVE LINER AND APPLY FRICTION PADS IN POSITION SHOWN APPLY PRESSURE TO PAD TO SQUEEZE OUT ALL TRAPPED AIR AND ASSURE ALL EDGES ARE FULL CONTACT WITH CASE FRICTION PAD FRICTION ALIGN EDGE OF PAD AND EDGE OF FRONT COVER CAUTION 00 NOT OVERLAP PAD ONTO SURFACE OF REAR COVER INTRINSICALLY SAFE USAGE Selected personal radios with appropria
22. 8V K19 A48E03739 136 160 MHz RF Board K19 A4WEOS740 150 174 MHz RF Board K19 2CCFO04086 Tantalum 1 uF 16 K19 28GC003278 Square chip 1 16W 470K ohms 5 K18 2CAK008208 Ceramic chip 1000 pF 10 50V K19 2CAK009208 Ceramic chip 1000 pF 10 50V ISSUE 1 19 2 026018 Tantalum l0uF 16V K19 2RGC003 185 Square chip 1 168 15K obms 5 K19 2RFB003253 Variable GFO4 OK ohms SYMBOL GE PART NO DESCRIPTION K19 2CAK000208 Ceramic chip 1000 pF 10 50V K19 2QB4012024 K19 2CCB026018 Tantalum 0 uF 16V K19 2RGC003219 Square chip 1 16W 47K ohms K19 2QBA006166 182075 K19 2CAK009218 Ceramic chip 0 01 uF 10 50 K19 28GC003409 Square chip 1 16W 68K ohms INTEGRATED CIRCUITS K19 2CAK009208 Ceramic chip 1000 pF 10 50 a chip 1 ohms 35 K19 2RGCO03219 Square chip 1 169 47K ohms 5 19 2 0004124 Prescaler MC12018L 19 2 009141 Ceramic chip 22 pF 5 50 K19 2FBD001471 1829 136 160 MHz K19 2A44J004062 PLL MC145159P1 150 174 MHz K19 2RGCO003151 Square 1 16 4 7K ohms 5 19 2 009109 Ceramic cnip 12 pF 5 50 K19 2FBD001489 A3FX01829 2 K19 2FBD001471 A3PX01829 1 136 160 Maz X19 2RGCO03110 Square 1 169 ohms 5 K19 2RGC003219 Square 1 16 47K ohms 5 K19 2 HA106090 VCTCXO A4WXO1328 2 5 ppm K19 2CAK009372 Ceramic chip 27 pF 5 50 K19 2YBA106082 48 01328 5 ppm 18 2 0001488 01829 2 150 174 Miz 1 2
23. AC 1 HR H2A2M2A 240 VAC 16 HR H2A2N1A 240 VAC 1 HR CORR GENERAL ELECTRIC E DESK CHARGER H2A1L2A 121 VAC 16 HR H2A1J1A 121 VAC 1 HR H2A1M2A 240 VAC 16 HR H2A1N1A 240 VAC 1 HR VEHICULAR CHGR RPTR H2V01 Vehicular Charger H2V02 Vehicular Chgr Rptr Contro mixture of numerics 0 48 and alphanumerics through the eight characters in the LCD display Channel control can come from either the up down channel ramping but tons front keypad entry or the Home Channel feature Eight Programmable Modes Up to eight modes are programmable with any number of channels in each mode the sum of channels and blank channels in all modes equal to 48 Programmable Multi Tone Channel Guard CTCSS Encode Decode Channel Guard tone frequencies within the range of 67 Hz to 210 7 Hz including all of the standard EIA frequencies may be programmed Differ ent encode decode encode only and with without Chan nel Guard frequencies are also programmable into the radio Selectivity Stability Pond Standard HIGH CAP NICD N STD CAP NICD P X HIGH CAP NICD No Battery The same channel is used with and without Channel Guard by programming two different radio channels with the same frequency information but only one w
24. CONT vvvvvvvvvvllivvvvvvvvvvilvvvvvvvvVv V 40 39 38 57 36 35 34 3332 30292827276 252423 2221 20 19 617615 4 15 2 11 0987 6543 21 14 P13 P12 SIGNALING BOARO UA GND 7 5V 24 CONTROLLER BOARD FUSE BOX FRONT aF FI 410987654521 54321 FUSE uj gt I2 Djaj gt 216215 al elas isle 9 HT lt gt 814 lel SPKR LOB 5 i SPKR LOA tall in 25 a 4 7 5 Coo Ao CONT 8 ANT CN 8 TEST CN Bottom View RADIO UNIT FL301 A203 OUTLINE DIAGRAM COMPONENT SIDE J101 12 345 J102 7K1 O Bur B 97 Qv S E A106 FL302 A201 SOLDER SIDE La C337 C338 S C210 5 T S L le C338 n 306 15307 C314 2 E 211 au P ane 2 0 EH H O go Us t TIPS D 105 06 1 5 2 C320 C 8 ig Oz 45 05 0 9 a CR201 08 PRIM Ct09 ri a ns P in 5 5 gts 08 e23 3103 07 2 2 41 toe R305 BE 16318 5 0 5 R303 i m 32 eros R128 1 cur mes C1230 E JR125 g 12305 C244 0102 cod p ua RO 05 rj 03 8 Q C127 133 R129 Lo 5 q 1305 1 A N inj tJ a Cag 101 pes R118 m 08 i 9 C306 R3
25. FL 2 R29 k19 2R6C001833 Square chip 1 10W 2 2 ohm 10 C69 X19 2CCF004102 Tantalum 1 uF 15 WV K19 8604190140 Audio Processor STCS140F R30 K19 2RGC001908 Square chip 1 10W 24 ohm 1 K19 2RGC001627 Square 1 10W 10 onm 5 10036 NJM2073D X19 2AAJ0 EM 11188 Ceramic chip 0 01 uP 50 WV R31 19 280 001916 Square chip 1 10 27 ohm 1 K19 24BD025012 ubD74HCO4d Ti 832 K19 2RGC001585 square chip 1 10 1 K obm 36 19 280 001585 square 1 10W 1 ohm 35 and K19 24 48004230 K19 20AK008511 Ceramic chip 0 1 uF 25 WV R33 K19 24AB004233 X19 20AK011298 Ceramic chip 0 015 uF 25 wv R34 K19 2RGC001833 Square chip 1 10 2 2 obm 10 EX9 280C001974 1 108 10 X ohm 215 1015004050 APASAT C75 K19 20CF004102 Tantalum 1 uP 15 WV R35 K19 2RGC001643 Square chip 1 10W 100 ohm 5 TAE K19 2A42001060 143882 2 5 i R36 K19 2RGC001890 Square chip 1 10W 20 ohm 1 K19 2CAK011196 Ceramic chip 1000 pF 50 WV ang K19 2RGC001825 Square 1 10W 220 K ohm 5 K18 2CCF004102 Tantalum 1 uF 15 WV K19 2R6C001585 Square 1 104 1 ohm 5 K19 5PBAOO4058 R38 K19 2RGC001874 Square chip 1 10 10 ohm 1 c79 K19 204J023037 Ceramic chip 330 pF 50 wv R39 K19 2RGCO01643 Square chip 1 10 100 K ohm i55 No thru 19 280 001827 Square 1 108 10 ohm 5 K19 2CaK011253 Ceramic 50 wv R41 X19 2RGC001759 Squar
26. IE 24 to r 3300 P ez LU bY uf ge Be ee BE lt S yt 8 Pohl oa Controller Board 2 BS BS FS GS Ps s ay s SP 5 25 4 04023 m 18 OUTLINE DIAGRAM SCHEMATIC DIAGRAM LBI 31629 COMPONENT SIDE 5 4 33 R316 R315 MES M 2 88 10 2 e s i pi ll R322 CLK 2 a R322 R323 R324 1 q CR301R302 Te aT ly al 216 llam PI 2 isa t 22 o STROBE o P307 R305R304 Hg DATA PI 3 _____________ C die Sa ENABLE eU ae 2 8319 L R318 P2 3 5 T D2 BUSY 2 muc 9 eux rrr A 305 c304 pee A Dj 3f 3 LIM TONE 1 6 SOLDER SIDE cust L R320 or aren e TMR NUM E 35 6353 35 1 2 J 72 gt w n DISC sl gt 2 9 Ed A303 a 0 10 9 L4 nl 1 rt Cs 3 6 dlg a RIS p m OEAZOEA TOEA SLOTUL 0 1 i T TONE our ELS seal _ g 91 SJ 5 2 Rum GND gt 22 3062 2063 et Note PARTS NOT ON STANDARD BOARD BUT LAYOUT MUST INCLUDE PROVISIONS gt x CONNECTION MADE FOR STANDARD BOARD REMOND FOR Signalling Board M PD Signaling Board A4WE04024 A4WE04024 LBI 31629 OUTLINE DIAGRAM COMPONENT SIDE SOLDER SIDE m Sane SE zm TTE
27. LBI 31629B Maintenance Manual M PD SYSTEM 136 174 MHz PERSONAL TWO WAY FM RADIO COMBINATION INCLUDES SERVICE SECTION LBI 31677 Ericsson Inc Private Radio Systems Mountain View Road Gw Lynchburg Virginia 24502 E R IC SSON 1 800 528 7711 Outside USA 804 528 7711 Printed in U S A TABLE OF CONTENTS SPECIFICATIONS OPTIONS AND ACCESSORIES COMBINATION NOMENCLATURE 3 4 us go MP SON DESCRIPTION wee Oe eee EAR ee Bee EOS AL OPERATION zx wauu San ape tee EE aes Boy uaa Su ee ee us te al aes ms SYSTEM ANALYSIS uuu Sc Rev kU pansa s i Sk eae ERE elk NE ers MAINTENANCE ud RT EMI ERREUR ee ae Ae Eke eee OUTLINE DIAGRAMS Radio Board RS bu RA DAN SEA EROR Web PEN EAE uersu We Controller Board iu hk mio RR Signaling Board ae docs nets Shepard RE ep acu wp weh RR xd es LED Board 5 ul s p emo p um Busse v Rh iua Battery Packss 45 y a de e rte tree e tdeo eS LAS eines SCHEMATIC DIAGRAMS Radio uet ie Reine X ku sta k eek wow ale wok Controller Board usu hoe p xe EUR S Q t bas be eg Signaling Board satan wee are dub are spere du
28. Microphone with GE STAR Lanyard e PDAEIC 19B801508P6 Speaker Microphone Antenna PDNCIA 19B234804P21 Antenna 150 174 MHz Helical WB PDNCIB 19B234804P1 Antenna 136 151 MHz Helical PDNCIC 19B234804P2 Antenna 150 162 MHz Helical PDNCID 19B234804P3 Antenna 162 174 MHz Helical e PDNCIE 19B234804P11 Antenna 403 440 MHz Helical e PDNCIF 19B234804P12 Antenna 440 470 MHz Helical e PDNCIG 19B234804P13 Antenna 470 512 MHz Helical PDNCIL 19A149061P10 Antenna 403 440 MHz Whip PDNCIM 19A149061P11 Antenna 440 470 MHz Whip PDNCIN 19A149061P12 Antenna 470 512 MHz Whip e PDNCIH 19B235043P1 Antenna 806 870 MHz Elevated Feed e PDNCIJ 19A149061P2 Antenna 806 870 MHz Short Flex PDNCIK 19A149061P1 Antenna 806 870 MHz Flex PDHCIC 19A144704G1 Belt Clip 19B233241G1 PDHCID 19B226627G2 Swivel Mount 19A144704G1 19B233243G1 PDHCIP 19D901765P2 Case amp Belt Loop 19D901765P5 19D901765P13 PDHCIR 19D901765P4 Case amp Belt Loop for 19D901765P5 radio w high capacity battery 19D901765P13 PDHCIS 19D901765P1 Case Swivel Mount Belt Loop 19D9017 65P5 19D901765P13 19B226627G2 PDHCIT 19D901765P3 Case Swivel Mount Belt 19D901765P5 Loop for radio w high 19D901765P13 capacity battery 19B226627G2 PDHCIK 19B233236G1 Shoulder Strap 19B216496P3 MEMORY EFFECT IN NICKEL CADMIUM BATTERIES Nickel Cadmium batteries can develo
29. RY CONT TEMP SPKR SENSE SPKRB GND Figure 10 Battery Pack MAINTENANCE This Maintenance section provides information on adjust ments of the radio transmit receive and synthesizer preven tive maintenance and a Disassembly Procedure Information is also provided for removing and replacing chip components and module replacement The Service Section listed in the Table Of Contents provides a more complete set of alignment proce dures for the radio plus a detailed Troubleshooting Procedure INITIAL ADJUSTMENT After the radio has been programmed as described in Pro gramming Instructions LBI 31635 the following adjustments should be made by a certified electronics technician Transmit Circuit Alignment The transmit circuit is factory tuned and should not require any readjustment The frequency and modulation should be measured and recorded for future reference Receive Circuit No initial adjustments to the receive circuit are required Synthesizer Circuit No initial adjustments to the synthesizer are required PREVENTIVE MAINTENANCE To ensure a high operating efficiency and to prevent me chanical and electrical failures routine checks should be per formed of all mechanical and electrical parts at regular intervals Preventive maintenance should include the following checks Antenna The antenna and antenna contact should be kept clean free from dirt or corrosion If the antenna
30. Remove the seven screws at M using the Phillips head screwdriver The LCD board can now be readily removed See Figure 18 REPLACEMENT The major components of the M PD Personal Radio are the PA TX AMP driving amplifier PC Power Control Module VCO Voltage Controlled Oscillator and the VCTCXO Ref Osc These are very reliable devices and will not normally need to be replaced Before replacing any of these modules always check out the associated circuitry carefully To remove any of these major components refer to the applicable replacement procedure found in the Service Sec tion LBI 31677 TROUBLESHOOTING PROCEDURE Maintenance of the M PD Personal Radio is faciliated by using the Troubleshooting Procedures and service techniques unique to this radio The Troubleshooting procedures are designed to quickly lead the serviceman to the defective cir cuit or component These procedures are found in the Serv ice Section WEATHERPROOF INTEGRITY The M PD radio is designed to meet MI 810 D specifi cation for Blowing Rain All access to the M PD radio are protected from water entry by suitable gaskets and seals However degradation due to use or disassembly during re pairs may affect the integrity of the seals as provided by fac tory assembly A maintenance procedure is provided in the Service Section LBI 31677 to assure that the radio housing will continue to meet the weatherproof features as designed LBI 31
31. TION CHANGES 25 LBI 31629 PARTS LIST SYMBOL GE PART NO DESCRIPTION SYMBOL GE PART DESCRIPTION PARTS LIST R9 K19 2RGC001627 Square chip 1 10W 10 K ohm 5 SYMBOL GE PART NO DESCRIPTION thru K19 286COD1858 square 1 108 2 ohm 1 M PD CONTROLLER BOARD R20 9 286 001619 Square chip 1 108 4 7 K ohm 5 s ose K19 2CAK011360 Ceramic chip 3300 pF 50 WV ki joWacuoisar 1 108 4 7 ohm 10 AERE v5 eee Ral K19 286C001827 Square chip 1 109 10 ohm 5 and R22 K18 2CAKO11188 Ceramic chip 0 01 uF 50 x19 2RGC001627 Square 1 10 10 ohm 5 K19 2CAK011298 e 1 hip 0 015 uF 50 WV R23 K19 2RGCO01643 8 hip 1 10 100 K ohm 5 414 28GC quare bip 1 7109 ohm t5 K18 280C001833 square 1 108 2 2 ohm 10 C63 K19 2CAK005511 Ceramic chip 0 1 uF 25 WV 824 t SYMBOL GE PART NO DESCRIPTION K19 2RGC001643 Square 1 108 100 ohm 5 825 k19 22GC001908 Square chip 1 10W 24 ohm 1 ces K19 2CCF006024 Tantalum 6 8 uF 10 WV R28 K19 2RGC001916 Square chip 1 10R 27 K ohm 1 9 2800001791 Square 1 104 10 ohm 10 ces Ki9 2CARO11188 Ceramic chip 0 01 uf 50 WY INTEGRATED CIRCUITS and nar K19 2RGC001593 Square chip 1 108 2 2 ohm 5 K19 2RGC001627 Square 1 10 10 K ohm 5 am X19 2AD4004318 Micro Processor HD63705VOCP R28 K19 28GC001585 Square 1 108 i ohm 45 ces X18 2CCF008024 Tantalum 6 8 uF 10 WV K19 2CAAG17382 TCSSIT7A
32. The transmitter completely covers the band within the split with no adjustments except for the RF power control voltage from the controller Receive Circuit The receiver consists of three major circuits as follows a Front End Circuit Consists of single stage pre amplifier with about 12 dB gain and the pre BPFs and the post BPFs of the pre amplifier b First Mixer and IF Circuit A special double balanced mixer provide a 45 MHz first IF which is coupled through band pass filter LBI 31629 b VCTCXO Module The VCTCXO is a tem perature compensated crystal oscillator to pro vide a 13 2 MHz reference frequency and has modulation capability c Phase Lock Loop Consists of a frequency di vider and a low current drain C MOS IC for phase comparison Logic Circuit The Logic circuit consists of a LCD board a signaling board and a control board with an audio IC as follows a LCD Board Includes LCD driver circuits for the display b Signaling Board Includes a CMOS microcom puter an audio amplifier and a comparator cir cuit This board provides DTMF and GE STAR encoding sequential Two Tone decoding and control for the SCAN operation c Control Board Carries a microprocessor a bat tery backed RAM audio circuit and I O inter connections with the frequency synthesizer and the display Thus this board commands all the functions and operation of the M PD radio d Audio IC Includes transmitter and receiver
33. USED K19 A3WLD7614 K19 44WLO7892 K19 A4WLO7607 K19 A3WL07295 K19 A3WLO7296 K19 A4WLO7514 NOT USED NOT USED K19 A4WLO7610 K15 A4WLO8244 19 4 07611 K19 A4WLOT608 K19 A4WL07604 K19 A4WL07805 K19 44WL07434 K19 A3WL07579 K13 A3WL07578 K19 A3WL07580 K19 A4WL07594 K19 A4WL07882 K19 A4WL07910 K19 A4WL07435 K19 A4WLO7606 K19 448L07685 K19 A4WLOBOOT X18 A48L07863 K19 A4WLOB445 K19 A48L076684 K19 A4WLOBTOR K18 A18L07561 K19 A1WLO7560 NOT USED K19 419L07570P2 K19 ALWLO7570Pt K19 42WL07512 19 2 1 07509 19 44 1 08826 K19 ASWLO7654 NOT USED NOT USED NOT USED NOT USED NOT USED K19 A4WLO7499P2 K19 A48L07490P1 K19 A4WL07694 K19 A4WL083B3 K19 A4WL07880 K19 A3WL07513 K19 44WLORG94 Front Cover Front Escutcheon SYS Window Light Diffuser UDC PTT Plate PTT Lever Base Plate Fuse Cover Key Pad Name Plate Nameplate GE LCD Frame Plates SPKR Mounting Brackets B Strap Ground Strap Battery Holder Contact Lugs B Strap Sheet Battery Connector Springs SPKR Mute Contacts UDC Contacts UDC Nut Pivot Pin Top Switch Pad 16 Key Pad PTT Switch Pad MIC Gasket Elastic Rubber SPKR Gasket SPKR Dust Screen insulator LCD BD Zebra Contacts Contact Lug B LI Battery Cover LCD Sheet Insulator Sheet SPKR Mounting Rubber Rear Cover UHF VBF Rear Cover 800 MHz Casting UNF VHF Casting 800 MHz Tx Rx Shield Cover Receptacle Plate RF Connector Antenna Switch Housing
34. WEO4024 ISSUE 2 DESCRIPTION INTEGRATED CIRCUITS Micro Processor HD683705VOF OP AMP uPC1251G2 TL Comparator uPC393 Tantalum Ceramic chip 390 pF Ceramic chip 1500 pF Ceramic chip 22 pF RESISTORS Square 1 KohmJ Square 1 108 100 Square 1 108 620 KohmJ Square 1 10 330 KohmJ Square 1 10 160 KohmJ Square 1 10 82 Kohmd Square 1 109 39 KohnJ Square 1 108 10 KohmJ Square 1 10W 220 KohmJ Square 1 108 10 KohnJ Square 1 108 1 MohmJ Square 1 10W 10 KohmJ Square 1710 10 KohmnJ Squaro 1 10 2 2 ohmK Square 1 108 100 KohmJ Not Used LBI 31629 27
35. a telephone call by direct entry through the DTMF keypad or through the Recall Telephone Num Power Switch Battery Pack ber feature Turn the radio on adjust the audio level and select the desired operating channel as covered in TO RECEIVE A MESSAGE Figure 1 M PD Operating Controls and Accessories gt O 5 m N Qa A gt GO te a i 9 18 2 iro iO i UIE EE s c 1 oer gt m e 202 pC 28 AES 22 ml 210 t z al gt cl gt s zl J 2 i mcer J z e 3 x H 2 T 4 a I u 25 E S 5 S a 5 48 o w ag m a i d Figure 2 Block Diagram 2 Use DTMF keypad or use the Recall Telephone Number key RCL to enter the digits of the tele phone number 3 Press the secondary key ES and then press the SEND key An optional tone sidetone may be heard as each digit is transmitted 4 When someone answers press the PTT bar and speak directly into the grille on the radio o
36. amic chip 1000 pF 10 507 K19 2CCP004086 Tantalum 1 uF 10V K19 2CAK009125 Ceramic chip 15 pF 5 50 K19 2CAK009109 Ceramic chip 12 pF 5 50V K19 2CAK009216 Ceramic chip 0 01 uF 10 507 K19 2CAK009257 Ceramic chip 10 pF 0 5 pF K18 2QAD004020 2303356822 X19 2LABO14901 A4WX01334 K19 2CCF004086 Tantalum uf 16V K19 2CAK009125 Ceramic chip 15 pF 5 50V RESISTORS K19 2LAB014918 A48X01335 K19 2CBB062171 Electrolytic 100 uF 16 19 2 009026 Ceramic chip 2 pF 0 25 pF Ki9 2RGC003110 Square chip 1 16W 1X ohms 5 K19 2CAK009216 Ceramic chip 0 01 uF 10 K19 2CCF004086 Tantalum 1 uF 16V 19 2 009158 Ceramic chip 33 pF 5 507 19 20800160139 K19 2CAK009208 Ceramic chip 1000 pF 10 K19 2CAK009216 Ceramic chip 0 01 uF 10 507 K18 28GCO03383 Square chip 1 16 47 ohne 5 K19 2CCF004086 Tantalum 1 uF 167 K19 2CAK009182 Ceramie chip 100 pF 58 50V K19 28GCO03243 Square chip 1 16 150K ohms 5 K19 2CAK009218 Ceramic chip 0 01 uP 10 K19 2RGCOOINGO Square chip 1 16 220 ohms 5 19 21 181657 K19 3RGC003227 Square chip 1 188 100K ohms 5 K19 2CCFO04088 Tantalum 1 uF 167 K19 2CAK009208 chip 1000 pF 10 507 K19 2CBB034121 Blectrolytic 22 uF 16V K19 2A3NLOT7654 Antenna K19 28GCO03110 Square chip 1 16 1 ohms 5 K19 2CAK009208 Ceramic chip 1000 p 10 K19 2CAK009182 Ceramic 100 pF 5 50V K19 2CAK009257 Ceramic 10 pF 40 5 pF 50 COMPONENTS ADDED DELETED OR CHANGED 8Y PRODUC
37. antalum 1 uP 16V K19 2CAK008034 Ceramic chip 3 pF 0 25 pF 50V K19 2CAK009182 Ceramic chip 100 pF 5 50V K19 2LAA001743 LALOZKRR47M K19 2CAK009208 Ceramic chip 1000 pF 10 50V x1ig 2LABD149a3 A4X013689 4 5t K19 286C003037 Square chip 1 168 100 ohms 5 K19 2CAK009307 Ceramic chip 8 pF 0 5 pP 50V K19 2CAK009257 Ceramic chip 10 pF 0 5 pP SOV X19 2LABO14935 449X01340 39nH X19 2RGC003242 Square chip 1 168 47 ohms 5 K19 2CAK009281 Ceramic chip 6 pP 0 5 pF 50V K19 2CAK009208 Ceramic chip 1000 pP 10 507 xis 2LARD149a3 A4 x01369 K19 2RFBO03253 Variable GFO4W 10K ohms 19 2 009158 Ceramic chip 33 pF 5 507 19 2 04086 Tantalum 1 uF 167 K19 2LAB014935 A49X01340 K19 2RGC003060 Square chip 1 18 220 anms 5 K19 2CAK009109 Ceramic chip 12 pF 5 50V K19 2CAR009208 Ceramic chip 1000 pF 10 50V K19 2LAADO1743 LALO2KRRATM K19 2RGC003243 Square chip 1 168 150K ohms 5 K19 2CAK009034 Ceramic chip 3 pF 0 25 pF 50V K19 2CAK009216 Ceramic chip 0 01 uF 10 50V 19 2 001070 NL322522T R10M K19 2CAK009216 Ceramic chip 0 01 uF 10 50 K19 2CAK009190 Ceramic chip 330 pF 5 50V 19 280 001014 A4WX01364 K19 2RGC003045 Square chip 1 16W 150 ohms 5 K19 2CAK009216 Ceramic chip 0 01 uF 10 80V K19 2CAK009218 Ceramic chip 0 01 uF 10 50V K19 2LAB024140 A4FXO1878 5 K19 2RGC003177 Square chip 1 16K ohms 5 19 2 009104 Ceramic chip 12 pP 5 50V K19 2CAK008
38. ard Signaling Board VS 50W 24ohm 0 5 MICROPHONE UNIT CAPACITORS Ceramic chip 1000 pF 50 WV ASSOCIATED PARTS Antenna 136 150 MHz Antenna 150 162 MHz Antenna 190 174 MHz Antenna 162 174 MHz Antenna 403 440 406 460 MHz Antenna 440 482 MHz Anteona 470 512 MHz Antenna 806 870 MHz COMPONENTS ADDED DELETED OR CHANGED BY PRODUCTION CHANGES 13 LBI 31629 INTERCONNECTION DIAGRAM CA2 FLEX CABLE UOC CONNECTOR rL i 4 P2 25072 EXT MIC IN TE an 2 Vou DISC QUT re FLEX CABLE OD 34021107 1215 31 li BATT OUT 1 0216010 1 ok UDC system swn o Op te to 51 21 I SWC 9 90 I SWR 3 1 1200 EMER EMER 16 BUTTON 2 415 7 I I I 18 MUTE Lol swe 2 3 9 scan 54 oR 5 410 171 loo s ol O53 1 01 0 lio ATA i l JO 9 4 tp 120741 5 5 LCD BOARD WR 4 BUTTON 13 lac SWC 0 o 4 L PTT qq AL cas FLEX CABLE ae FLEX CABLE O SPKR LOB 2 SPKA HI SE Hla sla PREE e O e 4 om gt ala Ql c als 54 lt a SIME g x 2 aja 2322322223 s 22248 85854455558 53 Elaa
39. cks 22 RADIO CHARGIN CONTACTS CONTACTS BATTERY PACK RADIO SUPPLY SWITCHED B CONTINUOUS CHARGE R3 59 5 52 THERMAL SWITCH SPKR MUTE SHORTING CONTACTS THERMAL SENSE GROUND GROUND INTRINSICALLY SAFE UNITS LATCH ASM GROUND RADIO SUPPLY THERMAL SENSE CHARGE POWER SWITCH OFF POSITION SHOWN REAR VIEW SIDE VIEW 194704850 5 STANDARD CAPACITY 19 704850 4 STANDARD CAPACITY INTRINSICALLY SAFE 194704850 7 HIGH CAPACITY SHORT ISA704850P6 HIGH CAPACITY INTRINSICALLY SAFE SHORT LATCH ASM GROUND RADIO REAR VIEW I9A704860P5 19A704860P4 ISA704860P7 19 704860 6 POWER SWITCH OFF POSITION THERMAL SHOWN SENSE CHARGE FRONT VIEW HIGH CAPACITY LONG HIGH CAPACITY INTRINSICALLY SAFE LONG EXTA HIGH CAPACITY EXTA HIGH CAPACITY INTRINSICALLY SAFE LBI 31629 MECHANICAL PARTS BREAKDOWN z j gt A a E X E D 2 SYSTEM AIWLO09006 LBI 31629 PARTS LIST M PD RADIO SYSTEM TYPE A4WL08999 MECHANICAL PARTS ISSUE 3 SYMBOL GE PART NO DESCRIPTION 26 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 55 57 58 58 60 61 62 K19 A WLO 558 K19 A1WLO7568 NOT USED K19 A3WLO7574 K19 43WL07601 K19 A3WLO7576 K19 A3WL07575 K19 A2WLO7573 K19 A391 07577 K19 44WLO7451 K19 A4WLO766L NOT
40. cond IF amplifier A302a Pin 2 of HA12442V and converted to the second IF frequency 455 kHz The second IF output is connected to Pin 7 of HA12442V through the 455 kHz ceramic filter to the IF am plifier and FM detector circuits The recovered audio from the FM IF IC is connected to J102 4 A202 dc INPUT 23 dBm 50 een 0 Figure 4 Power Amplifier a POWER ADJ RF OUT RF IN PO SE TX 5 4V HIGH LOW Figure 5 Power Control Module OUTPUT 38dBm 6 WATTS 50 OHMS PA 1ST STAGE A202 2 136 174 MHz gt 1 ue 48 MH 2 22 50 5 CR201 X BPF RFA BPF Q30 EL302 n FROM o LPF ANTENNA IFN TdBm INJ FREQ FROM 9106 SYNTHESIZER Figure 6 RF Amplifier Mixer 1ST IF INPUT 45 0125 MHz 1ST IF OUTPUT 45 0125 MHz dl Figure 7 First IF Amplifier AUDIO 455 KHz QUAD DET 16 DISC OUT IF INPUT 9 160 mVPP 48 0125 MHz 50 2 HAI2442V Figure 8 Second IF Amplifier Discriminator Synthesizer Circuit The Synthesizer circuit contains Phase Lock loop mod ule PLL A102 VCTCXO Reference Oscillator module A103 TX RX Voltage Controlled Oscillator module VCO A106 and a Low Pass Filter amplifier LPF Refer to Fig ure 9 Synthesizer The VCO used to generate the receive and transmit reference frequencies is phase locked to a stable VCTCXO reference oscillator through t
41. e Microphone Sensitivity EIA 60 MOD Maximum Attack Time PTT Pushed Audio Frequency Response RECEIVE Sensitivity 12 dB SINAD Spurious Emissions Spurious Response Rejection IM Distortion Rejection Adjacent Channel Selectivity Squelch Sensitivity Distortion EIA 0 5 Watt Audio Frequency Response LBI 31629 SPECIFICATIONS FCC Identification Number AXAO9WNTR 145 A AXAO9WNTR 145 B 5 PPM 65 Milliamperes 195 Milliamperes 1 9 amperes 183 x 69 x 43mm 183 x 69 x 43 mm 219 x 69 x 43 mm 219 x 69 43 mm 24 ounces 24 ounces 29 ounces 29 ounces 30 to 60 0 5 to 5 Watts 37 dBm 5 kHz 45 dB 396 5 PPM 50 ohms Less than 90 dB SPL 25 milliseconds Within 1 and 3 dB of a 6 dB octave pre emphasis from 300 Hz to 3000 Hz 116 dBm 57 dBm 72 dB Minimum 70 dB Minimum 70 dB 30 kHz 6 dB SINAD Minimum Adjustable 5 Maximum Within 1 and 3 dB of a 6 dB octave de emphasis from 300 Hz to 3000 Hz LBI 31629 COMBINATION NOMENCLATURE Digits 1 amp 2 Digit 3 Digit 4 Digit 5 Digit 6 Digit 7 Product Frequency Controller 800 MHz STANDARD MODEL OR SCAN MODEL SYSTEM MODEL y r GENERAL
42. e 1 10 470 ohm 5 CRI 9 20 005016 DAN202KT 96 3 R42 K19 2RGC001585 Square chip 1 10W 1 ohm 5 18 2 1 CR2 K19 2QBE005032 DA204KT 96 thru Ua onm 153 19 2 005511 Ceramic chip 0 Ra cra K19 2QBE005127 155154 K19 2R6C001825 Square chip 1 108 220 ohm 5 K19 2CAK09265 de CR4 X19 2QB 005032 DAN204KT 96 19 2 0 001627 Square 1 108 10 ohm 5 Mi ture R49 K19 2RGC004019 Square chip 1 10 8 2 ohm 1 and K19 29R8005032 DA204KT 96 R50 K19 2RGCO01817 Square 1 10W 33 ohm 5 K19 2CAKO05511 Ceramic chip R51 K19 2RGC001932 square chip 1 108 100 ohm 1 K18 2RGCO01827 square 1 10 10 ohm 35 PINHEADER R52 K19 2R6C001924 Square chip 1 10W 43 K ohm 1 19 280 001643 square 1 10 100 K obm 5 K19 2CAK009265 Ceramic chip pF P101 K19 2PD4023003 85846 205 iio R53 K19 2RGC001643 Square chip 1 108 100 ohm 5 K19 2CAKO05811 Ceramic chip 0 1 uF R55 K19 2R6C001726 Square chip 1 10 47 ohm 5 19 280 001759 Square 1 109 470 K ohm 58 K19 20AK011253 Ceramic chip VOI IMNAISTONE rie R56 X19 2RGCOD1585 Square chip 1 108 1 K ohm 5 qi K19 2040001133 NPN 28 26206 71 9 R57 K19 2R6C001643 Square chip 1 109 100 ohm 5 EI SRGCOD1841 Sauare chip 1 108 4 7 t10 92 19 2040004095 PNP 258624T1BBY3 K19 2CAK011188 Ceramic
43. ernal MIC amp SPKR e Switch Out e EMER e UDC GE Star Lanyard The radio control microprocessor senses the value of volt age at the UDC line and switches the appropriate audio circuits to provide proper radio accessory operation The UDC volt age is set by two resistors within the UDC connector Battery Packs The battery packs are available in three capacities stand ard high and extra high All battery packs provide a nominal 7 5 Volt DC output To protect the battery pack from external short circuits the positive charging contact is diode protected An internal thermistor senses variations in battery pack temperature to automatically control a charger and provide a maximum charge without overheating the battery pack All battery packs can be charged in one hour The battery is shipped fully charged to the customer ready for use However if the battery pack is stored for any length of time it should be fully charged before placing into service LBI 31629 Charger combinations for charging the battery packs are available with charge times of 1 hour 3 hours and 16 hours A combination can be a single unit desk or a vehicular charger It can also be a wall mounted multiple charger Charge Level A fully charged battery pack should provide a terminal voltage greater than 7 5V A fully discharged battery pack should provide a reading of no less than 6V CHARGER RADIO SUPPLY BATTERY SUPPLY BATTE
44. fier is located between the audio processor and the microcomputer A301 Amplifier A302b and A302a provides a Low Pass Filter resistors R310 R312 and capacitors C303 C305 for tone encoding Comparator A303 The comparator converts the audio signal from the DISC output into a signal which can decode the microcomputer A301 LCD Board The LCD board is composed of the following items LCD Drive IC A1 e LCD e Back Lighting Circuit Q1 Q2 and CRI 6 The LCD driver converts data from the microcomputer into a signal which can drive the LCD display The LCD display is equipped with 8 character 14 segments each and eight status displays Microcomputer signals drive the LCD driver and the driver turns the LCD Also this board has a back lighting circuit enabled upon receiving a signal from the microcom puter when any of the control switches VOL PTT etc are operated Key Pad The key pad used with the standard M PD Personal Radio is located on the top of the housing This key pad consists of flexible cable and rubber contacts The cable connects with the microcomputer UDC Connector The UDC connector is located on the side of the radio housing so that various kinds of external equipment connec tions can be made External equipment connecting signals are as follows e Data e RX Data For Data Loader e CTS e PTT EXT MIC e RX Audio Out e T R e Mute e Disc Out e 7 5 Volts For Ext
45. functions are made up of switched capacitor filters amplifiers and timing logic The timing for this logic is derived from the 3 579545 MHz clock generator The clock signal is also applied to the microcomputer Audio Amplifier A4 and A6 The audio amplifier is located between the audio proces sor and the microphone or the speaker Amplifier A6 pro vides pre emphasis and amplification for transmit audio and de emphasis for the receive audio Amplifier A4 amplifies the output signal of A6 to the level adequate for driving the speaker and VDC audio output Voltage Regulator Circuits A7 A9 Q2 Q3 Q10 and Q11 Voltage Regulator Circuit A9 provides a regulated 42 5 VDC Using the 2 5 VDC as a reference voltage A9 Q2 and Q3 in combination generate 5 4 VDC for the radio unit The control Transistors Q10 and Q11 are used for current limiting to avoid break down External Data Buffer A5 The External Data Buffer is located between the UDC connector and the microcomputer for protection of the inter nal circuits Signaling Board The Signaling Board consists of the following circuits CMOS Microcomputer A301 Audio Amplifier A302 Comparator A303 Microcomputer A301 The microcomputer provides various software for signaling the radio unit as follows Encoding the DTMF and GE Star Decoding the sequential Two Tone Providing control for SCAN operation Audio Amplifier A302 The audio ampli
46. he use of the PLL This feedback loop divides the VCO frequency down to a signal in the range of 7 MHz 10 MHz divides this signal with a programmable divider to 5 6 25 kHz and generates a VCO control signal by comparing the 5 6 25 kHz feedback with a 5 6 25 kHz signal derived by dividing a 13 5 MHz VCTCXO by 1056 As the least significant bit in the pro gramming is changed the VCO is forced to change by 5 6 25 kHz The synthesizer circuitry is contained on two modules the VCO module A106 and the VCTCXO reference Oscilla tor module A103 Phase Lock Loop Module A102 The PLL module A102 contains a reference frequency divider phase detector and a programmable divider The phase detector DC voltage output signal is filtered with a passive low pass filter followed by a 6 25 kHz filter to re duce the level of reference modulation on the VCO This DC output represents the error between the VCO frequency 3 BI EATERAL SWITCH MT Xo LBI 31629 phase and the reference VCTCXO and is applied to the VCO on frequency A lock detect output is developed from Pin 9 output of A102 This output is checked by the micro computer to prevent transmission before the VCO is on fre quency Serial data from the microcomputer is shifted into the PLL to set the division parameter which establishes the fre quency A clock signal is provided on another input and the data is latched with the enable input Voltage Controlled Oscillator A106
47. ith Channel Guard capability Programmable Multi Code Digital Channel Guard Encode Decode Similar capability as with Tone Chan nel Guard is provided Programmable Carrier Control Timer Personality in formation includes an optional period of transmit time from 15 to 120 seconds after which the unit will auto matically unkey and provide an alerting tone This fea ture is reinitiated on every PTT and the alert tone is removed upon release of the PTT Minimum Volume Level Personality information in cludes a minimum volume level below which the radio controls cease to reduce the volume Squelch Tail Elimination Squelch and audio circuits are designed so that annoying squelch pops which may occur at the end of received messages are minimized both with and without Channel Guard This system is compatible with an existing GE system Programmable Squelch The noise squelch opening threshold can be programmed for each channel Channel Busy Lock Out Personality information in cludes the capability to prevent the transmitter from op erating on a channel where carrier activity is present The Channel Busy indicator BSY is active during this time Automatic Manual Power Levels The desired power level on each channel can be programmed into the radio personality such that it is automatically selected channel by channel or selected manually Home Channel Feature A Home channel can be pro grammed into the radio which is
48. module to a typical power output level of 6 watts at Pin 5 The output at Pin 5 is connected through the power control hybrid IC A203 PC and TX RX switching diode CR201 to low pass filter net work FN A minimum power level of 5 watts is on the out put of the filter network Power Control Module A203 The RF power output of the radio is regulated by sensing variations in the RF power output of the transmit PA module to control the supply voltage to the first stage of the PA mod ule refer to Figure 5 Supply voltage cannot be applied to the first stage of the PA module until the transmit circuit is keyed applying 5 4 Volts to Pin 11 of Power Control PC hybrid IC A203 When the transmit circuit is keyed the out put of a reference amplifier determined by the High Low power control is applied to the positive input of a com parator circuit The output of the final PA is connected to Pin 1 of the PC module and to the 50 ohm coupled line The detected voltage of the CM coupled output is applied to the negative input of the comparator circuit The amplifier is enabled when the transmit circuit is keyed until then the output of the amplifier is low and transistor Q202 is held off As the PA module begins to increase output power the detected voltage causes the series regulator circuit to regulate the sup ply voltage to maintain constant RF output power Filter Network FN The output of the PA module is connected to fil
49. ntil the output voltage is approximately 1 Volt per cell This equals 6 Volts output for current Ericsson GE M PD personal radio batteries Refer to the typical Ni Cd cell discharge curve in Fig ure 19 Note the flatness of the discharge voltage Discharging below the knee of the curve does not give added service Experience shows discharging below 1 0 Volt is not necessary for reconditioning a cell 2 A full charge cycle using an appropriate Ericsson GE charger 3 This procedure should be repeated again Performing the rated discharge and charge cycle at least twice should sufficiently restore the battery NOTE The above procedure is easily done when using the discharge analyzer 19B801506P9 with the Ericsson GE Rapid Multi Charger 19B801506P16 or P18 OPEN CIRCUIT VOLTAGE z u o lt gt o lt o 2 a 0 CHARGED DISCHARGED CAPACITY DISCHARGED Figure 19 Typical Ni Cd Voltage Discharge Curve SYMBOL MPDDi MPDCS3 MPDSIG 1 42 P1 SPKR1 Ci tbru cs GE PART NO A4WEO373T A4WE04023 A4WEO4024 SL 101 T 12 K19 2DDBO10043 K19 2PDA023150 K19 28DA001286 10 2844006109 K19 2CAK011196 198234804 1 18B234804P2 198234804P21 19B234804P3 19B234804P11 19B234804P12 2 88234804 13 19414906121 PARTS LIST M PD SYSTEM RADIO CHASSIS A4WEO3897 ISSUE 3 DESCRIPTION LCD Board Controller Bo
50. or contact should be come dirty or corroded loss of radiation and a weak signal will result Mechanical Inspection Since portable radio units are subject to shock and vibra tion check for loose plugs nuts screws and other parts to make sure that nothing is working loose Alignment The transmit and receive circuit meter readings should be checked periodically and the alignment touched up when necessary Refer to the applicable alignment procedure and troubleshooting sheet found in Service Section LBI 31677 for typical voltage readings Frequency Check Check transmit frequency and deviation Normally these checks are made when the unit is first put into operation They should be repeated after the first month of operation then again one time each year WARNING To prevent loss of memory in RAM A2 on the Control ler Board lithium battery BT1 should be replaced at three years A procedure for changing BT1 is provided in Service Section LBI 31677 DISASSEMBLY To gain access to the Radio board transmit receive and synthesizer circuits or Control Board for servicing disassem ble as follows Radio Board Controller Board Step 1 through Step 4 Step 5 through Step 7 Disassembly Procedure See Figure 11 CAUTION ALWAYS remove the battery pack before removing any component board to avoid blowing the fuse Equipment Required e Small Phillips head screwdriver e Small flat blade screwdriver
51. ould be repeated again Performing the deep discharge and charge cycle at least twice should sufficiently restore the battery REDUCED CAPACITY IN NICKEL CADMIUM BATTERIES Nickel Cadmium batteries in some applications can de velop a condition of reduced capacity sometimes called Memory Effect This condition may occur when 1 battery is continuously overcharged for long peri ods of time 2 regularly performed duty cycle which allows the battery to expend only a limited portion of its capac ity If the nickel cadmium battery is only sparingly or seldom used and is left on continuous charge for one or two months at a time it could experience reduced capacity On the first dis charging cycle the output voltage could be sufficiently lowered to reduce the battery s hours of useful service The most common method of causing this limited capacity is regularly performing short duty cycles when the battery is operated so that only a portion 5096 of its capacity is ex pended This type of operation can cause the battery to be come temporarily inactive and show a severe decrease in the ability to deliver at full rated capacity Any nickel cadmium battery showing signs of reduced ca pacity should be carefully checked before being returned under warranty or scrapped If reduced capacity is a fact the fol lowing procedure may restore capacity 1 Discharge the multicell battery at the normal dis charge rate u
52. p a condition called Memory Effect or reduced battery capacity This condition occurs when 12 PARTS LIST LBI 31629 1 The battery is continuously overcharged for long peri ods of time 2 regularly performed duty cycle which allows the battery to expend only a limited portion of its capac ity If the nickel cadmium battery is only sparingly or seldom used and is left on continuous charge for one or two months at a time it could develop the Memory Effect On the first dis charging cycle the output voltage could be sufficiently lowered to reduce the battery s hours of useful service The most common method of causing the Memory Ef fect is regularly performing short duty cycles This is when the battery is operated so that only a portion 50 of its ca pacity is expended This type of operation can cause the bat tery to become temporarily inactive and show a severe decrease in the ability to deliver at full rated capacity Any nickel cadmium battery showing signs of reduced ca pacity should be checked for the Memory Effect before be ing returned under warranty or scrapped If the Memory Effect is a fact a procedure for reconditioning it should be performed as follows 1 A complete discharge deep discharge This can be accomplished by turning the radio on and allowing the battery to discharge overnight 2 full charge cycle using an appropriate Ericsson GE charger 3 This procedure sh
53. put of the mixer The double bal anced Mixer has a typical conversion loss of 6 dB between the RF input and IF output All inputs and the output of the RF Amplifier Mixer one 50 ohms impedance The 7 dBm injection frequency level provided by the synthesizer and amplifier circuit transistor Q106 is connected to the injec tion frequency input through a 50 ohms matching circuit The output of the Mixer circuit is connected to the input of the first IF Amplifier First IF Amplifier The first IF amplifier contains two amplifier circuits and two crystal filters of two and four poles respectively refer to Figure 7 The first IF signal 45 MHz from the first mixer circuit connects to the input of pre amplifier transistor Q302 through pre crystal filter FL303 with an impedance of ap proximately 3K ohms Pre amplifier Q302 provides a 17 dB power gain The output is connected to the input of IF am plifier transistor Q303 through crystal filter FL304 IF am plifier Q303 has a 13 dB power gain an input impedance of approximately 3K ohms and an output impedance of ap proximately 2 2K ohms Second IF Amplifier Discriminator A302 The Second IF Amplifier Discriminator circuit contains FM IF IC A302 HA12442V and 455 kHz ceramic filter FL305 refer to Figure 8 The FM IFIC contains a local os cillator mixer IF amplifier FM detector and an audio ampli fier The 45 MHz IF output from the first IF amplifier is connected to the input of se
54. r across the face of an external microphone Release the PTT bar as soon as you stop talking Messages can not be received when the PTT bar is pressed 5 When the conversation is completed press the key to disconnect from the telephone system To Recall a Telephone Number The RCL button is used to recall the last number dialed or to recall one of the ten 16 digit numbers that can be stored in memory To Recall the Last Number Dialed and then the RCL 1 Press the secondary key MEM button 2 Then press the secondary key and then the SEND key as in Step 3 of To Make a Telephone Call To Recall a Telephone Number Stored in Memory Press the key number of the memory location 1 through 9 2 Press the secondary key and then the RCL key 3 Press the secondary key and the SEND key as in Step 3 of To Make a Telephone Call SYSTEM ANALYSIS Ericsson GE M PD Personal radios are two way FM ra dios designed for public communications The M PD Sys tem radio consists of four printed wire boards as follows Radio Board carries the transmit receive and fre quency synthesizer circuits Control Board supports logic control and audio processor circuits Display Board carries LCD displays LBI 31629 e Signaling Board provides additional software con trolled signaling functions Interconnection of the control board with other boards and control circuits is made with flexible circ
55. selected by pressing the Home button This allows a user to quickly reach a reference channel Surveillance Feature In addition to the ability to pro gram the display lighting on or off per channel the side tone beep related to the operation of a radio control is capable of being disabled on a channel by channel basis Eight Character Alphanumeric Liquid Crystal Dis play This display is used to exhibit the condition of the radio It shows Channel Designation Signaling Transmit Volume Level Battery Condition Channel Busy High Low Power output SCAN ON OFF and Priority 1 amp 2 Simple Remote Control Capability By connection through the UDC Universal Devices Connector a sim ple speaker microphone can be operated which can also control PTT and Volume level Push Button Controls Only control functions on the radio with the exception of the power ON OFF switch are operated through push button controls on the top and sides of the radio Programmable through UDC The entire personality of the radio is programmed into the radio through the UDC through four connections The Ericsson GE TQ2310 Universal programmer is one method of pro gramming the radio while the capability exists to inter face to an RS 232 device at a maximum of 1200 baud Keyboard Enable Pressing two keypad keys Secon dary Function and KEY BD in sequence activates the front DTMF keyboard The user can then change radio functions
56. te factory installed F4 Options are certified as Intrinsically Safe by the Factory Mutual Research Corporation for use in Class 1 Division 1 or 2 hazardous locations in the presence of Groups C and D at mospheres Non incendive Class 1 Division 2 hazardous loca tions in the presence of Groups A B C and D atmospheres Hazardous locations are defined in the National Electrical Code Useful standards NFPA 437A and NFPA 437M for the classifications of hazardous areas may be ordered from the Na tional Fire Protection Association Batterymarch Park Quincy MA 02269 BATTERIES Only batteries with a green latch shall be used with a per sonal radio that is rated and labeled as Factory Mutual Intrinsi cally Safe Use of non specified batteries voids Factory Mutual approval The following battery options are approved for use in intrinsically safe radios e PDPAIC 19A704850P4 Rechargeable battery standard capacity PDPAID 19A704860P4 Rechargeable battery high capacity e PDPAIF 19A704860P6 Rechargeable battery extra high capacity ACCESSORIES The accessories listed below are approved for use with in trinsically safe radios Use of accessories other than those listed voids Factory Mutual approval PDABIA 19B801508P3 Headset Microphone PDACIA 19B801508P2 Earpiece kit 19B801508P8 5 Lanyard PDAEIA 19B801508P1 5 PDAEIB 19B801508P4 Speaker
57. ter net work FN through TX RX switching diode CR201 The FN network is a passive LC low pass filter with an insertion loss of less than 0 5 dB in the pass band It also has a rejection greater than 45 dB in the stop band The output of the FN is connected to the system antenna or to the UDC connector Receive Circuit The M PD receive circuit as shown in Figure 2 consists of the following circuits e RF Amplifier Mixer e First IF Amplifier e Second IF Amplifier Discriminator RF Amplifier Mixer The RF Amplifier Mixer circuit contains two third order band pass filters FL301 and FL302 an RF amplifier circuit Q301 and a double balanced diode mixer circuit A301 Refer to Figure 6 RF Amplifier Mixer RF from the an tenna or UDC connector is coupled through transmit low pass filter FN and RF switching diode CR201 to the input of the RF amplifier circuit Low pass filter FN is used in the receive circuit to provide additional receive selectivity The RF signal on the input of the RF amplifier is first coupled through band pass filter FL301 to the input of grounded emitter broad band RF amplifier transistor Q301 This am plifier provides 12 dB of power gain to reduce thermal noise The output of the RF amplifier is coupled through band pass filter FL302 to drive double balanced mixer A301 The RF signal from the RF amplifier and the injection frequency from the synthesizer circuit provide a difference of 45 MHz IF on the out
58. uit boards and connectors All control leads which are barred such as PTT mean that the function indicated occurs when the lead is in a low voltage condition Circuit illustrations shown in the following text are sim plified representatives of actual circuits They are intended only to illustrate basic circuit functions RADIO BOARD Transmit Circuits The M PD transmit circuit as shown in Figure 2 Block Diagram consists of the following integrated circuit mod ules e Amplifier TX Amp Power Amplifier PA Power Controller PC Antenna Switch AS e Filter Network EN Amplifier Module A201 Amplifier module TX Amp A201 is a single stage RF amplifier hybrid IC A 0 dBm RF signal on the input will produce a 23 dBm signal on the output refer to Figure 3 This module is broadband and does not require tuning 23dBr TX 5 4V 5 Figure 3 Amplifier Module TX Amp Power Amplifier Module A202 Power Amplifier PA A202 is a three stage wide band amplifier module with an input and an output impedance of 50 ohms refer to Figure 4 The first stage of the PA mod ule has the DC power supplied by power control transistor LBI 31629 Q202 The RF power output from Pin 2 of the TX Amp module A201 is connected through a resistor attenuator to Pin 1 of the PA module where it is applied to the input of the RF power amplifier stages The RF power amplifier stages amplify the input from the TX Amp
59. y R67 X19 2RGC001635 Square chip 1 108 22 K ohm 5 X19 2Q40004095 PNP 28B624T1BBV3 X19 2YAA181665 AT 41 3 579545 MHz 19 2 005511 Ceramic chip 0 1 uF 25 WV d R68 K19 2RGC001932 Square chip 1 10 100 K ohm 1 K19 2CCF004102 Tantalum 1 uP 15 WV i Gis END Rag x19 2RGC001627 Square chip 1 10 10 ohm 5 X19 2CAK011188 Ceramic chip 0 01 uF 50 WV 216 X19 204D004095 PNP 25B624T18BY3 R70 K19 2RGC001585 Square chip 1 10 1 K ohm 5 19 2 01126 2c L chip 16 R71 K19 2RGCO01932 Square chip 1 10W 100 ohm 1 19 2 11055 Ceramic chip 2 pF SO WY RESISTORS an K19 2CAK011220 Ceramic chip 22 pF 50 WY K19 2RGC001643 Square chip 1 10W 100 ohm 5 thru R73 K19 2RGC004076 Square chip 1 109 470 K ohm 1 K19 2CCF004102 Tantalum 1 uF 15 WV RS R74 K19 286C001874 Square chip 1 10 10 K ohm 1 R75 K19 2RGCO04076 Square chip 1 108 470 K ohm t1 R76 K19 2RGCO01874 Square chip 1 10W 10 ohm 1 COMPONENTS ADDED DELETED OR CHANGED BY PRODUCTION CHANGES 26 PARTS LIST M PD LCD BOARD A4WE03737H ISSUE 3 PARTS LIST SYMBOL AL thru cs ca and c7 CR1 thru CRE 1 Q2 RL thru R4 RS R6 R7 R8 and R9 R10 811 812 and R13 R14 R15 LED Ji 1 thru J1 5 BE PART K1L9 2ADC003 107 19 2 011196 K19 2CAK005586 X19 2CCF004183

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