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Motorola LX2, Service Manual

The Motorola LX2 is a high-performance device that offers advanced features and functionality. To make the most of this product, ensure you have the comprehensive User Manual at your disposal. Download the manual for free from manualshive.com and unlock the full potential of your Motorola LX2.

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LX2

 plus / advanced and LX4 plus / advanced

B2270901

Content is subject to change without notice!

7

3.2 

Decoder

LX2 plus:

  PCB No. 227.02.xx

LX2 plus / advanced:

PCB No. 227.01.xx

LX4 plus / advanced: 

PCB No. 230.01.xx

3.2.1 

Power Supply

PCB No. 227.02.xx:
The DC/DC up-Converter IS5 produces the output voltage of 2.85V supplying the digital
section with the help of components L3, D6, C20, C21. The diode D8 protects the con-
verter from too high input voltages or from a battery connected the wrong way round.
C23, C24 decouple the converter from the battery.
The components T1, R3, R7, R11 and C10 are necessary for a stable start behavior of the
controller.
Transistors T3, T4 turn the receiver on and off.

PCB No. 227.01.xx / PCB No. 230.01.xx:
The DC/DC up-Converter IS5 produces the output voltage of 2.4V suppling the digital
section with the help of components L3, D6, C20, C21, R17 and R25. The diode D8 pro-
tects the converter from too high input voltages or from a battery connected the wrong
way round.

3.2.2 

Receiver Interface

All signals necessary to control the receiver are routed to the plug ST1. Resistors R14,
R15, R19 und R20 serve as RF decoupling components.

PCB No. 227.02.xx:
High supply voltage 2.85V is decoupled by L1, low supply voltage 1.2V is decoupled by
L2, C17 and C22.

PCB No. 227.01.xx / PCB No. 230.01.xx:
High supply voltage 2.40V is decoupled by L1 and R6, low supply voltage 1.2V is decou-
pled by L2, C17 and C22.

3.2.3 

Charger and Programmer Interface, Charging Circuit

There is an asynchronous serial interface allowing data exchange between pager and
charger and programming the pager (data, battery voltage, 0V).
The charging Unit controls the charging procedure of the pager`s battery. Charger and
pager exchange data regarding the charge level via wire P2.

3.2.4 

Real-time Clock and Memory

Real-time clock circuit IS1 provides time and date. The clock continues running after re-
moving the battery for a period of appr. 2 days, because it is buffered by Goldcap C2.

PCB No. 227.02.xx:
IS3 and IS4 are non-volatile memory circuits, holding all necessary parameters for a cor-
rect operation of the pager (IS4: RIC addresses, alert key words, activated functions,
Menu prompts, ... IS3: selected settings, received messages, ...).

Summary of Contents for LX2

Page 1: ...SERVICE MANUAL POCSAG RADIO PAGER LX2 plus LX2 advanced LX4 plus LX4 advanced and CHARGING UNITS ...

Page 2: ... 02 xx 33 5 5 Parts Location of Decoder PCB 227 02 xx 34 5 6 Bill Of Material of Decoder PCB 227 02 xx 35 5 7 Schematic of Decoder PCB 227 01 xx 36 5 8 Parts Location of Decoder PCB 227 01 xx 37 5 9 Bill Of Material of Decoder PCB 227 01 xx 38 5 10 Schematic of Decoder PCB 230 01 xx 39 5 11 Parts Location of Decoder PCB 230 01 xx 40 5 12 Bill Of Material of Decoder PCB 227 01 xx 41 5 13 Schematic ...

Page 3: ...LX2 plus advanced and LX4 plus advanced B2270901 Content is subject to change without notice 3 1 Block Schematic Diagram PROG U CHARGE 1 2 V DC CHARGE LAMP VIBRATOR ...

Page 4: ...ll e g 500mAh or primary cell not chargeable Temperature Range Operation 10 55 C Storage without battery 40 80 C Degree of Protection IP 52 Size 78mm x 52mm x 19mm Weight 65g battery inclusive German BOS Approval DME II 14 02 Conformaty Directive 1999 5 EG 2 2 Charger PCB No 228 01 xx AC DC Adapter primary 230V AC secundary 6V DC 400mA Charging current of pager cell Accelerated Charge appr 100mA T...

Page 5: ... Temperature Range Operation 10 55 C Storage without battery 40 80 C Degree of Protection IP 52 Size LX2 appr 78 x 52 x 19mm LX4 appr 80 x 54 x 19mm Weight incl battery appr 65g LX2 85g LX4 German BOS Approval LX2 DME II 17 04 LX4 DME II 18 04 Conformaty Directive 1999 5 EG 2 4 Charger PCB No 228 06 xx AC DC Adapter primary 230V AC secundary 6V DC 400mA Charging current of pager cell Accelerated C...

Page 6: ...1 C132 C133 C134 L121 L131 und L132 The output of the balun has two signals which are equal in ampli tude but differ in phase by 180 degrees The additional phase shift of C131 L131 C134 und L132 creates signals at 45 45 135 and 225 The signals at 45 and 225 be come the differential I In phase signals and the signals at 45 and 135 become the differential Q Quadrature signals being connected to the ...

Page 7: ...Interface All signals necessary to control the receiver are routed to the plug ST1 Resistors R14 R15 R19 und R20 serve as RF decoupling components PCB No 227 02 xx High supply voltage 2 85V is decoupled by L1 low supply voltage 1 2V is decoupled by L2 C17 and C22 PCB No 227 01 xx PCB No 230 01 xx High supply voltage 2 40V is decoupled by L1 and R6 low supply voltage 1 2V is decou pled by L2 C17 an...

Page 8: ...ng messages back lighting If self reception occurs the controller can be operated with a different crystal frequency of Q2 The following frequencies can be used and recognized by the controller firmware automatically firmware F2270112 and previous firmware F2270113 and later 3 579545 MHz 3 532800 MHz 3 686400 MHz 3 579545 MHz 4 000000 MHz 3 686400 MHz 4 032000 MHz 3 840000 MHz 4 096000 MHz 3 99360...

Page 9: ...apacitor placed near to the microcontroller Resistor R49 discharges the capacitors quickly if the Charger is turned off by removing the adapter cable This is to prevent the microcontroller from working with supply voltages outside the specified range A decoupled voltage to supply external devices is available on socket BU2 That supply is current limited by R20 and protected by fuse SI1 3 3 2 Charg...

Page 10: ...led to one wire using diode D10 Resistor R15 serves as a pull up resistor connected to the communication wire which is used in both directions By placing additional components marked and using a suitable software the charger can be upgraded to be able to work as a programmer 3 3 4 Temperature Supervision The Charging Unit supervises the ambient temperature during the charging procedure and varies ...

Page 11: ...r rent is sinked by the microcontroller via resistors R6 R10 and R33 Transistor T11 to gether with resistors R38 and R39 form the global switch to supply the LED s This would allow a dimming function which is not built in at the moment 3 3 7 External Antenna An external antenna can be connected to socket BU3 which is connected to a coupling loop in order to couple the received signal to the pager ...

Page 12: ...e to supply external devices is available on socket BU2 That supply is current limited by R20 and protected by fuse SI1 3 4 2 Charge Current The chargeable battery inside the pager gets charged whenever one of the three current paths is turned on switching transistors T1 T52 or T53 eneabled by the microcontrol ler The respective base resistor R50 R51 or R52 is drawn to ground by an open drain port...

Page 13: ...re during the charging procedure and varies the charge current accordingly i e accelerated charge is permitted within a speci fied temperature range only The voltage of the resistive devider R31 R32 is measured R31 is a temperature dependent resistor 3 4 5 External Alert Devices After reception of an alert relay REL1 is activated by T6 and R13 Resistor R30 limits the current and D2 serves as a fre...

Page 14: ...ight emitting diodes D4 D8 or D9 indicate the operation conditions The necessary cur rent is sinked by the microcontroller via resistors R6 R10 and R33 3 4 7 External Antenna An external antenna can be connected to socket BU3 which is connected to a coupling loop in order to couple the received signal to the pager ...

Page 15: ...ow shown in Fig 3 until it is free Separate the back housing from the front housing refer to Fig 4 To replace the back housing align it with the front housing and press back together The metal pin for the carrying chain has to be pushed into the respective hole of the back housing Start replacing the latch at the side opposite to the charging contacts refer to Fig 5 place the studs into the zip ho...

Page 16: ...LX2 plus advanced and LX4 plus advanced B2270901 Content is subject to change without notice 16 Fig 3 Fig 4 Fig 5 Fig 6 Fig 7 Fig 8 Fig 9 Fig 10 ...

Page 17: ...efer to Fig 9 Remove the decoder board from the front housing refer to Fig 10 Starting with the sound transducer insert the decoder board into the front housing and press down refer to Fig 11 Be careful the transducer seal and the keypad must not get out of place Let the decoder board lock to the front housing catch on the housing near to the battery compartment Replace the shock pad refer to Fig ...

Page 18: ...anced and LX4 plus advanced B2270901 Content is subject to change without notice 18 4 1 5 Exploded View Diagram LX2 plus LX2 advanced LCD module assembly back housing assembly keypad assembly front housing assembly ...

Page 19: ...LCDM227 11 xx LCD LX2 with flexible PCB and driver 16 GGM227 03 xx LCD light diffusor assembly 17 UK 227 01 xx Decoder board 18 JSVM1 3VK1DVH Vibrator motor 19 GGM227 40 xx Shielding foil 20 GGM227 17 xx Shielding cover 21 GGM227 24 xx Schock pad 22 UK 227 yy xx yy 10 21 Receiver board 23 GGM227 01 xx Back housing assembly 24 GGM468 28 xx Adhesive shock pad 1x0 25 25 GGM468 28 xx Adhesive shock pa...

Page 20: ...the housing near to the positive battery contact of the battery compartment Fig 2 Move it a little upwards remove it from the housing and pull it away in the di rection of the arrow refer to Fig 3 Use tweezers or similiar to unlock the catch on the back housing from the front housing refer to Fig 4 Separate the back housing from the front housing refer to Fig 5 Start re assembly with the housing l...

Page 21: ...LX2 plus advanced and LX4 plus advanced B2270901 Content is subject to change without notice 21 Fig 7 Fig 9 Fig 8 Fig 10 Fig 5 Fig 6 Fig 4 Fig 3 ...

Page 22: ...e the shock pad In order to remove the decoder board from the front housing slightly push the LCD diffusor near to the battery compartment refer to Fig 9 Insert the decoder board with the guiding tabs in front into the front housing refer to Fig 9 and press down gently Replace the shock pad aligning it correctly Pay attention to the marked areas 1 3 Fig 11 Replace the receiver board refer to Fig 7...

Page 23: ...LX2 plus advanced and LX4 plus advanced B2270901 Content is subject to change without notice 23 4 2 5 Exploded View Diagram LX4 plus LX4 advanced ...

Page 24: ...8 xx LX4 Button green 9 GGM230 07 xx LX4 Front housing 10 GGM230 18 xx LX4 Lens labelled Motorola 11 GGM230 17 xx LX4 Button frame assembly 12 GGM230 22 xx LX4 Window frame 13 GGM230 19 xx LX4 Button left right white 14 GGM230 21 xx LX4 Button red 15 GGM230 20 xx LX4 Button up down white 16 GGM230 23 xx LX4 Keypad window frame 17 OKLCDM230 02 xx LX4 LCD assembly 18 GGM230 25 xx LX4 Light diffuser ...

Page 25: ... Insert the screw driver vertically into the holes in the back of the bottom housing refer to Fig 3 Turn the screw driver by max 1 8 turn and separate bottom and top housing with your fingers at the same time refer to Fig 4 Take off the cable connected to the contact pins from the printed circuit board Remove the top housing Before replacing the top housing check that the reset button is positione...

Page 26: ...f The Charging Unit Remove the top housing Remove the Charger PCB from the bottom housing Position the bumper feet in the bottom housing refer to Fig 5 Position the the PCB on the bumper feet so that the rubber posts fit in the holes on the PCB refer to Fig 6 Replace the reset button on the PCB Replace the top housing Fig 5 Fig 6 ...

Page 27: ...contacts or GGM228 17 01 LX4 Top housing with contacts 4 GGM228 09 xx LED Guide 5 GGM228 04 xx Reset Button 6 UF 228 06 xx PCB Charger 7 GGM228 10 xx Bumper feet set 4 pieces 8 GGM469 13 xx Bottom housing 9 ESDIMAB5SH DIN socket 5pole 90 10 FA M228 01 xx Antenna loop 11 ESBNCBU9050 BNC socket 90 50Ω 12 ESVBUKLDSMT0202 SMD power socket 13 GGM225 02 xx Shielding cover 14 BEM227 34 xx Bottom label 15...

Page 28: ...LX2 plus advanced and LX4 plus advanced B2270901 Content is subject to change without notice 28 5 Printed Circuit Boards 5 1 Receiver Schematic PCB No 227 10 xx value is frequency depended not placed ...

Page 29: ...0 C 227 12 xx 144 147 9 1 3 2 4 9 1 9 1 16 330 20 D 227 13 xx 147 150 9 1 2 7 2 4 8 2 7 5 1 16 330 20 E 227 14 xx 150 153 9 1 2 7 1 8 7 5 7 5 1 15 330 18 F 227 15 xx 153 156 8 2 2 7 1 8 7 5 7 5 1 18 330 6 8 A G 227 16 xx 156 159 7 5 2 7 2 2 6 8 7 5 13 270 18 H 227 17 xx 159 162 7 5 2 4 2 2 6 2 6 8 13 270 16 I 227 18 xx 162 165 6 8 2 1 8 5 6 6 8 15 270 16 J 227 19 xx 165 168 6 2 2 1 8 5 6 6 2 10 27...

Page 30: ...LX2 plus advanced and LX4 plus advanced B2270901 Content is subject to change without notice 30 5 2 Parts Location Receiver PCB No 227 10 xx Side 1 Side 2 ...

Page 31: ...0 SMD Capacitor 2 4pF 0 1 0603 NP0 SMD Capacitor 1 8pF 0 1 0603 NP0 SMD Capacitor 2 2pF 0 1 0603 NP0 SMD Capacitor 1 2pF 0 1 0603 NP0 C 122 C 123 CS0603NP0102 SMD Capacitor 1nF 0603 NP0 C 124 CS0603X7R103 SMD Capacitor 10nF 0603 X7R C 125 CS0603NP0102 SMD Capacitor 1nF 0603 NP0 C 126 A C 126 B C D C 126 E G C 126 F C 126 H I C 126 J K L CS0603NP02202 CS0603NP02002 CS0603NP01802 CS0603NP06p80 1 CS0...

Page 32: ... antenna J 101 ESFCI7212031111 SMD Socket 11pole L 120 LSLL2012FHR33J SMD Coil 330nH 0805 LL2012 L 121 A F L 121 G L LSLL2012FHR33J LSLL2012FHR27J SMD Coil 330nH 0805 LL2012 SMD Coil 270nH 0805 LL2012 L 130 LSLL2012FH68NJ SMD Coil 68nH 0805 LL2012 L 131 L 132 LSLL2012FHR22J SMD Coil 220nH 0805 LL2012 L 150 L 151 LSLL1608FH47NJ SMD Coil 47nH 0603 LL1608 L 161 LSLL2012FHR47J SMD Coil 470nH 0805 LL20...

Page 33: ...LX2 plus advanced and LX4 plus advanced B2270901 Content is subject to change without notice 33 5 4 Decoder Schematic PCB No 227 02 xx ...

Page 34: ... LX4 plus advanced B2270901 Content is subject to change without notice 34 5 5 Parts Location Decoder PCB No 227 02 xx Side 1 Side 2 Attention Pay attention to the correct polarity of part C2 and marking C2 size y C2 size x ...

Page 35: ...S4 ICSCAT24WC256KI1 8 SMD E PROM CAT24WC256KI 1 8 IS5 ICSMIC2571 1BMM SMD IC MIC2571 1 BMM T R MSOP IS1 ICSPCF8563TF4 SMD IC PCF 8563 T F4 S08 IS2 ICSUPD78F0034AY SMD IC UPD78F0034AYGK 9ET TQFP VIB1 JSVM1 3VK1DVH Vibrator Motor FM 109K1D Var Holder L1 LSLK16081R0K SMD Coil 0603 10 1µH L2 LSLK3216100M106 SMD Coil LK3216100M 10µH L3 LSSDS0604 181K SMD Inductor 180µH SDS0604 181K LCD1 OKLCDM227 16 01...

Page 36: ...LX2 plus advanced and LX4 plus advanced B2270901 Content is subject to change without notice 36 5 7 Decoder Schematic PCB No 227 01 xx ...

Page 37: ...LX2 plus advanced and LX4 plus advanced B2270901 Content is subject to change without notice 37 5 8 Parts Location Decoder PCB No 227 01 xx ...

Page 38: ... LCD Light Diffusor On H1 GGM468 28 01 Pager adhesive shock pad IS4 ICSCAT24WC256KI1 8 SMD E PROM CAT24WC256KI 1 8 IS5 ICSMIC2571 2BMM SMD IC MIC2571 2 BMM T R MSOP IS1 ICSPCF8563TF4 SMD IC PCF 8563 T F4 S08 IS7 IS8 ICSS80820CNMC B8F T2 SMD IC S 80820CNMC B8F T2 SOT23 5 IS2 ICSUPD78F0034AY SMD IC UPD78F0034AYGK 9ET TQFP IS6 ICSUPD78F9116BM SMD Contr µPD78F9116BMC 5A4 VIB1 secured by UHU plus JSVM1...

Page 39: ...LX2 plus advanced and LX4 plus advanced B2270901 Content is subject to change without notice 39 5 10 Decoder Schematic PCB No 230 01 xx ...

Page 40: ...LX2 plus advanced and LX4 plus advanced B2270901 Content is subject to change without notice 40 5 11 Parts Location Decoder PCB No 230 01 xx ...

Page 41: ...F4 SMD IC PCF 8563 T F4 S08 IS2 ICSUPD78F0034AY SMD IC UPD78F0034AYGK 9ET TQFP IS4 ICSCAT24WC256KI1 8 SMD E PROM CAT24WC256KI 1 8 IS5 ICSMIC2571 2BMM SMD IC MIC2571 2 BMM T R MSOP IS6 ICSUPD78F9116BM SMD Controller µPD78F9116BMC 5A4 IS7 IS8 ICSS80820CNMC B8F T2 SMD IC S 80820CNMC B8F T2 SOT23 5 L1 LSLK16081R0K SMD Coil 0603 10 1µH L2 LSLK3216100M106 SMD Coil LK3216100M 10µH L3 LSSDS0604 181K SMD I...

Page 42: ...d B2270901 Content is subject to change without notice 42 5 13 Charger Unit Schematic PCB No 228 01 xx Flash programming BR1 close after flash programming BR2 open relay active until reset BR2 closed relay active for 10s optional placement ...

Page 43: ...X4 plus advanced __________________________________________________________________________ B2270901 Content is subject to change without notice 43 5 14 Parts Location Charger Unit PCB No 228 01 xx Component side Solder Side ...

Page 44: ...MD LED green D 7 DSZSMBJ15C SMD Transzorb Diode SMBJ15CA D 8 OSLEDQTLP650C2T SMD LED red D 9 OSLEDQTLP650C3T SMD LED yellow D 10 DSDBAR43 SMD Diode BAR43 D 11 DSZBZX84C2V7 SMD Zener Diode BZX84C2V7 SOT23 D 12 DSDBAS19 SMD Diode BAS19 IS 1 ICSUPD78F9116AM SMD IC µPD78F9116AMC 5A4 IS 2 ICSSCI7710YDAT1 SMD IC SCI7710YDA S 81230SGUP L 1 LSSIMID02223 SMD Coil 22nH SIMID02 L 2 L 3 L 4 L 5 LSSIMID02335 S...

Page 45: ...or 47k 0603 5 R 43 RS12065270 SMD Resistor 27R 1206 5 R 44 RS08055473 SMD Resistor 47k 0805 5 R 45 RS06035152 SMD Resistor 1k5 0603 5 R 46 RS06035473 SMD Resistor 47k 0603 5 R 47 RS06035102 SMD Resistor 1k0 0603 5 R 48 RS06035101 SMD Resistor 100R 0603 5 R 49 RS08055332 SMD Resistor 3k3 0805 5 REL 1 ERA5WK Relay A 5 W K Takamisawa SI 1 SI0 375AELU1206 SMD Fuse 0 375A F1206A0R375FWR ST 2 ESJSTB3BEH...

Page 46: ...01 Content is subject to change without notice 46 5 16 Charging Unit Schematic PCB No 228 06 xx Programming BR1 open flash programming BR1 closed normal operation BR2 open relay active until reset BR2 closed relay active for 10s optional placement ...

Page 47: ...LX2 plus advanced and LX4 plus advanced B2270901 Content is subject to change without notice 47 5 17 Parts Location Charging Unit PCB No 228 06 xx ...

Page 48: ...3x9mm R1 RS08055102 SMD Resistor 0805 5 1k0 R16 RS06035104 SMD Resistor 0603 5 100k R2 13 15 17 41 RS06035103 SMD Resistor 0603 5 10k R20 RK020713R3 Resistor 0207 1 3R30 R22 not placed RKVVS05K14 Varistor 5 0 S05 K14 Q69X3422 R3 6 10 33 48 RS06035101 SMD Resistor 0603 5 100R R30 RS08055470 SMD Resistor 0805 5 47R R31 RSVN0805223 SMD NTC Resistor 0805 22k R32 RS06035223 SMD Resistor 0603 5 22k R34 ...

Page 49: ...e by pressing buttons Ù and Ú Test Step Display Function 1 Line 1 Serial Number Line 2 Frequency 2 Firmware Issue Controller Crystal Addition Info Testing the sound transducer 2s 3 Display Test checked pattern 1 Testing Vibrator 2s 4 Display Test checked pattern 2 Turn backlight on 5 Display Test checked pattern 1 Turn backlight off 6 inside charger only Display Test checked pattern 2 Start Testin...

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