Motorola LX2 plus Service Manual
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Motorola LX2 plus Service Manual

Pocsag radio pager and charging units
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See also: User Manual
SERVICE MANUAL
POCSAG RADIO PAGER
LX2 plus / LX2 advanced
LX4 plus / LX4 advanced
and CHARGING UNITS

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Summary of Contents for Motorola LX2 plus

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

  • Page 2: Table Of Contents

    LX2 plus / advanced and LX4 plus / advanced Contents Block Schematic Diagram Technical Data 2.1. Pager/ PCB 227.02.xx 2.2. Charger/ PCB 228.01.xx 2.3. Pager/ PCB 227.01.xx, PCB 230.01.xx 2.4. Charger/ PCB 228.06.xx Theory Of Operation 3.1. Receiver 3.2. Decoder 3.3.

  • Page 3: Block Schematic Diagram

    LX2 plus / advanced and LX4 plus / advanced Block Schematic Diagram B2270901 Content is subject to change without notice!

  • Page 4: Technical Data

    LX2 plus / advanced and LX4 plus / advanced Technical Data Pager PCB No. 227.02.xx (Decoder) 227.10.xx (Receiver) Frequency Range: 137.975 .. 174MHz Channel Separation: 20 / 25kHz No. of Channels: Code Format: POCSAG programmable baud rate (512, 1200, 2400 Baud) Sensitivity body-worn (typ.):...
  • Page 5 LX2 plus / advanced and LX4 plus / advanced Pager PCB No. 227.01.xx (Decoder) or 230.01.xx (Decoder) 227.10.xx (Receiver) Frequency Range: 137.975 .. 174MHz Channel Separation: 20 / 25kHz No. of Channels: Code Format: POCSAG programmable baud rate (512, 1200, 2400 Baud) Sensitivity body-worn (typ.):...

  • Page 6: Theory Of Operation

    LX2 plus / advanced and LX4 plus / advanced Theory Of Operation Receiver LX2 plus / advanced, LX4 plus / advanced: PCB. No. 227.10.xx 3.1.1 General The receiver of the POCSAG pager is a direct conversion receiver. The received radio signal is directly mixed to the AF band and no intermediate frequency exists.

  • Page 7: Decoder

    LX2 plus / advanced and LX4 plus / advanced 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.
  • Page 8 LX2 plus / advanced and LX4 plus / advanced PCB No. 227.01.xx / PCB No. 230.01.xx2: IS4 is a non-volatile memory holding all necessary parameters for a correct operation of the pager. Additionally, all received messages are stored by IS4.

  • Page 9: Power Supply

    LX2 plus / advanced and LX4 plus / advanced Charging Unit (PCB No. 228.01.xx) Charging Unit with PCB No. 228.01.xx 3.3.1 Power Supply The Charging Unit is powered by an external AC/ DC Adapter plugged into the wall power socket (U = 230V, f = 50Hz).
  • Page 10 LX2 plus / advanced and LX4 plus / advanced The microcontroller supervises voltages coming from the divider R34, R35 and serial re- sistor R12 and smoothed by capacitors C1 and C10, respectively. L5 again is a RF choke. Zener diode D11 limits the voltage to stay below the maximum allowable input value of the microcontroller.
  • Page 11 LX2 plus / advanced and LX4 plus / advanced 3.3.6 Indicators Light 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. Transistor T11 to- gether with resistors R38 and R39 form the global switch to supply the LED`s.
  • Page 12 LX2 plus / advanced and LX4 plus / advanced Charging Unit (PCB No. 228.06.xx) Charging Unit with PCB No. 228.06.xx 3.4.1 Power Supply The Charging Unit is powered by an external AC/ DC Adapter plugged into the wall power socket (U = 230V, f = 50Hz).
  • Page 13 LX2 plus / advanced and LX4 plus / advanced 3.4.3 Microcontroller All the controlling tasks are done by the 8 bit controller circuit IS1. The clock is generat- edby the internal oscillator. External components belonging to the oscillator are the ca- pacitors C4 , C5 and crystal Q1.
  • Page 14 LX2 plus / advanced and LX4 plus / advanced 3.4.6 Indicators Light 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: Disassembly/ Assembly

    LX2 plus / advanced and LX4 plus / advanced Disassembly/ Assembly Of The Pager LX2 plus / LX2 advanced 4.1.1 Removing / Replacing The Battery • Slide the door lock away from the battery door. • Slide the battery door until the locking tabs release.
  • Page 16 LX2 plus / advanced and LX4 plus / advanced Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 B2270901 Content is subject to change without notice!
  • Page 17 LX2 plus / advanced and LX4 plus / advanced Fig. 11 Fig. 12 4.1.4 Removing/ Replacing The Decoder Board • Remove the battery. • Remove the battery door, the latch and the back housing. • Remove the receiver board. •...
  • Page 18 LX2 plus / advanced and LX4 plus / advanced 4.1.5 Exploded View Diagram LX2 plus / LX2 advanced LCD module assembly back housing assembly keypad assembly front housing assembly B2270901 Content is subject to change without notice!
  • Page 19 LX2 plus / advanced and LX4 plus / advanced 4.1.6 Spare Parts LX2 plus / LX2 advanced Item Part Number Description GGM227.06.xx Lens GGM227.02.xx Front housing assembly MZS1.6M6X8+0.2 Metal pin 1.6m6X8+0.2 DIN 7 GGM227.36.xx + Grill clothe GGM227.39.xx Transducer seal GGM227.12.xx...

  • Page 20: Pager Lx4 Plus / Lx4 Advanced

    LX2 plus / advanced and LX4 plus / advanced LX4 plus / LX4 advanced 4.2.1 Removing/ Replacing The Battery • Slide the door lock away from the battery door (refer to Fig. 1). • Slide and open the battery door as shown in figure 1.
  • Page 21 LX2 plus / advanced and LX4 plus / advanced Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig. 10 B2270901 Content is subject to change without notice!
  • Page 22 LX2 plus / advanced and LX4 plus / advanced 4.2.4 Removing/ Replacing The Decoder Board • Remove the battery. • Remove the battery door and the housing latch. Take off the back housing. • Remove the receiver board (refer to Fig. 7).
  • Page 23 LX2 plus / advanced and LX4 plus / advanced 4.2.5 Exploded View Diagram LX4 plus / LX4 advanced B2270901 Content is subject to change without notice!
  • Page 24 LX2 plus / advanced and LX4 plus / advanced 4.2.6 Spare Parts LX4 plus / LX4 advanced Item Part Number Description GGM230.14.xx LX4 Front housing assembly (Items 2-9) GGM230.16.xx LX4 Housing latch GGM230.15.xx LX4 Grille cloth MZS1.6M6X8+0.2 Metal pin 1.6m6x8+0.2 DIN7NiRo EBM230.12.xx...
  • Page 25 LX2 plus / advanced and LX4 plus / advanced Charging Unit Work carefully to avoid damaging the PCB and housing. 4.3.1 Removing/ Replacing The Top Housing § Insert a size No. 2 slotted screw driver vertically into the holes in front of the bottom housing (refer to Fig.
  • Page 26 LX2 plus / advanced and LX4 plus / advanced 4.3.2 Removing/ Replacing The PCB Of 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).
  • Page 27 LX2 plus / advanced and LX4 plus / advanced 4.3.3 Exploded View Diagram 4.2.4 Spare Parts Charging Unit Item Part Number Description GGM228.07.xx Frame LX2 GGM228.18.01 Frame LX4 BEM228.02.xx Escutcheon GGM228.06.xx LX2 Top housing with contacts GGM228.17.01 LX4 Top housing with contacts GGM228.09.xx...

  • Page 28: Schematics, Parts Location And Bills Of Material

    LX2 plus / advanced and LX4 plus / advanced Printed Circuit Boards Receiver Schematic PCB No. 227.10.xx B2270901 Content is subject to change without notice!
  • Page 29 LX2 plus / advanced and LX4 plus / advanced Frequency Frequency C112 C113 C121 C131 C150 C154 C165 L121 C126 Range Range Option (pF) (pF) (pF) (pF) (pF) (pF) (pF) (pF) (pF) (MHz) A = 227.10.xx 138...141 0,75 B = 227.11.xx 141...144...
  • Page 30 LX2 plus / advanced and LX4 plus / advanced Parts Location Receiver PCB No. 227.10.xx Side 1 Side 2 B2270901 Content is subject to change without notice!
  • Page 31 LX2 plus / advanced and LX4 plus / advanced Bill Of Material Receiver PCB No. 227.10.xx Item Part Number Description C 101 CSTAB4766 SMDTantalum B, 47µF 6V C 102 CS0603X7R103 SMD Capacitor 10nF, 0603, X7R C 103 CS0603NP0102 SMD Capacitor 1nF, 0603, NP0...
  • Page 32 LX2 plus / advanced and LX4 plus / advanced Item Part Number Description C 151 - C 153 CS0603NP0102 SMD Capacitor 1nF, 0603, NP0 C 154 (A) CS0603NP00p75 SMD Capacitor 0.75pF±0.1, 0603, NP0 C 154 (B,D,E,F) CS0603NP01p00.1 SMD Capacitor 1.0pF±0.1, 0603, NP0...
  • Page 33 LX2 plus / advanced and LX4 plus / advanced Decoder Schematic PCB No. 227.02.xx B2270901 Content is subject to change without notice!
  • Page 34 LX2 plus / advanced and LX4 plus / advanced Parts Location Decoder PCB No. 227.02.xx Side 1 C2 / size x C2 / size y Side 2 Attention Pay attention to the correct polarity of part C2 ( + and – marking!)
  • Page 35 LX2 plus / advanced and LX4 plus / advanced Bill OF Material Decoder Board PCB No. 227.02.xx Item Part Number Description AS5002811Y04 Sound Transducer MMX-10M C9, C14, C16 CS0603NP0150 SMD Capacitor 0603 NP0 15pF CS0603X7R223 SMD Capacitor 0603 X7R 22nF CS0603X7R47316 SMD Capacitor 0603 X7R 47nF min.16V...
  • Page 36 LX2 plus / advanced and LX4 plus / advanced Decoder Schematic PCB No. 227.01.xx B2270901 Content is subject to change without notice!
  • Page 37 LX2 plus / advanced and LX4 plus / advanced Parts Location Decoder PCB No. 227.01.xx B2270901 Content is subject to change without notice!
  • Page 38 LX2 plus / advanced and LX4 plus / advanced Bill OF Material Decoder Board PCB No. 227.01.xx Item Part Number Description AS5002811Y04 Sound Transducer MMX-10M CS0603NP0150 SMD Capacitor 0603 NP0 15pF C7, C8 CS0603NP0220 SMD Capacitor 0603 NP0 22pF 5%...
  • Page 39 LX2 plus / advanced and LX4 plus / advanced 5.10 Decoder Schematic PCB No. 230.01.xx B2270901 Content is subject to change without notice!
  • Page 40 LX2 plus / advanced and LX4 plus / advanced 5.11 Parts Location Decoder PCB No. 230.01.xx B2270901 Content is subject to change without notice!
  • Page 41 LX2 plus / advanced and LX4 plus / advanced 5.12 Bill OF Material PCB No. 230.01.xx Item Part Number Description C1, C20, C22 CS0603Y5V104 SMD Capacitor 0603 Y5V 100nF C14, C16 CS0603NP0270 SMD Capacitor 0603 NP0 27pF 5% C17, C18 CSTAA10610 SMD Tantalum A 10µF 10V...

  • Page 42: Charger

    LX2 plus / advanced and LX4 plus / advanced 5.13 Charger Unit Schematic PCB No. 228.01.xx B2270901 Content is subject to change without notice!
  • Page 43 LX2 plus / advanced und LX4 plus / advanced 5.14 Parts Location Charger Unit PCB No. 228.01.xx Component side Solder Side __________________________________________________________________________ B2270901 Content is subject to change without notice!
  • Page 44 LX2 plus / advanced and LX4 plus / advanced 5.15 Bill Of Material Charger Unit PCB No. 228.01.xx Item Part Number Description FA-M228.01.01 Antenna Loop GGM225.02.xx 01: Shielding Cover BU 1 ESVBUKLDSMT0202 SMD Power Socket, KLD 0201L-B BU 2 ESDIMAB5SH...
  • Page 45 LX2 plus / advanced and LX4 plus / advanced Item Part Number Description R 20 RK0207130R0 Resistor, 30R0, 0207, 1% R 22 RKVVS05K14 Varistor, S05 K14, Q69X3422 R 23 RS12065560 SMD Resistor 56R, 1206 5% R 24 RS12065680 SMD Resistor 68R, 1206 5%...
  • Page 46 LX2 plus / advanced and LX4 plus / advanced 5.16 Charging Unit Schematic PCB No. 228.06.xx B2270901 Content is subject to change without notice!
  • Page 47 LX2 plus / advanced and LX4 plus / advanced 5.17 Parts Location Charging Unit PCB No. 228.06.xx B2270901 Content is subject to change without notice!
  • Page 48 LX2 plus / advanced and LX4 plus / advanced 5.18 Bill Of Material Charging Unit PCB No. 228.06.xx Item Part Number Description ESVBUKLDSMT0202 SMD Power Socket KLD 0201L-B ESDIMAB5SH DIN Socket MAB 5 SH ESBNCBU9050 BNC Socket 90°,50 Ohm,PCB Mount...

  • Page 49: Description Of Testmode

    LX2 plus / advanced and LX4 plus / advanced Description Of Testmode Starting Testmode : Turn off the pager, Press button Ù , press button Ú , press button × , press button Ù Test Steps in Testmode: Press button Õ to start the next test step.

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