Service manual

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SERVICE MANUAL

POCSAG RADIO PAGER

LX2 plus / LX2 advanced

LX4 plus / LX4 advanced

and CHARGING UNITS

Summary of content (49 pages)

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SERVICE MANUAL POCSAG RADIO PAGER LX2 plus / LX2 advanced LX4 plus / LX4 advanced and CHARGING UNITS
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LX2 plus / advanced and LX4 plus / advanced Contents 1. Block Schematic Diagram 3 2. Technical Data 4 2.1. 2.2. 2.3. 2.4. 4 4 5 5 3. 4. 5. 6. Pager/ PCB 227.02.xx Charger/ PCB 228.01.xx Pager/ PCB 227.01.xx, PCB 230.01.xx Charger/ PCB 228.06.xx Theory Of Operation 6 3.1. Receiver 3.2. Decoder 3.3. Charger 6 7 9 Disassembly/ Assembly 15 4.1. Pager LX2 plus / LX2 advanced 4.2. Pager LX4 plus / LX4 advanced 4.3. Charger 15 20 25 Schematics, Parts Location and Bills Of Material 28 5.1.
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LX2 plus / advanced and LX4 plus / advanced Block Schematic Diagram B2270901 Content is subject to change without notice! 1,2 V DC CHARGE LAMP VIBRATOR PROG UCHARGE 1 3
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LX2 plus / advanced and LX4 plus / advanced 2 Technical Data 2.1 Pager PCB No. 227.02.xx (Decoder) 227.10.xx (Receiver) Frequency Range: Channel Separation: No. of Channels: Code Format: 137.975 .. 174MHz 20 / 25kHz 1 POCSAG programmable baud rate (512, 1200, 2400 Baud) Sensitivity body-worn (typ.): at 512 Baud at 1200 Baud at 2400 Baud Antenna: External Connections: 5µV/m 7µV/m 9µV/m built-in loop antenna for charging and signalling to/ from charger or programmer 1.2V DC ( AAA cell) NiCd cell e.g.
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LX2 plus / advanced and LX4 plus / advanced 2.3 Pager PCB No. 227.01.xx (Decoder) or 230.01.xx (Decoder) 227.10.xx (Receiver) Frequency Range: Channel Separation: No. of Channels: Code Format: 137.975 .. 174MHz 20 / 25kHz 1 POCSAG programmable baud rate (512, 1200, 2400 Baud) Sensitivity body-worn (typ.): at 512 Baud at 1200 Baud at 2400 Baud Antenna: External Connections: Operating Voltage: 3µV/m 4.5µV/m 6µV/m built-in loop antenna for charging and signalling to/ from charger or programmer 1.
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LX2 plus / advanced and LX4 plus / advanced 3 Theory Of Operation 3.1 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. A discrete crystal oscillator stage and a frequency tripler stage form the necessary local oscillator for down-mixing.
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LX2 plus / advanced and LX4 plus / advanced 3.2 Decoder LX2 plus: LX2 plus / advanced: LX4 plus / advanced: 3.2.1 PCB No. 227.02.xx PCB No. 227.01.xx PCB No. 230.01.xx 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 converter from too high input voltages or from a battery connected the wrong way round. C23, C24 decouple the converter from the battery.
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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. 3.2.5 Display The display shows the incoming messages and the operator menues. The display is parallel driven. The voltage divider sets the voltage reference of display LCD1.
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LX2 plus / advanced and LX4 plus / advanced 3.3 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 (UAC = 230V, f = 50Hz). The adapter delivers an unstabilized DC voltage U= = 6V at IL = 0,4A to supply the Charging Unit. The adapter is connected to the Charger using socket BU1 of the Charger.
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LX2 plus / advanced and LX4 plus / advanced The microcontroller supervises voltages coming from the divider R34, R35 and serial resistor 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. The measured voltage difference is used to calculate a charge account. Transistor T13 is a current sink, activated during self-diagnostic or in order to discharge the battery.
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LX2 plus / advanced and LX4 plus / advanced 3.3.6 Indicators Light emitting diodes D4, D8 or D9 indicate the operation conditions. The necessary current is sinked by the microcontroller via resistors R6, R10 and R33. Transistor T11 together 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.
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LX2 plus / advanced and LX4 plus / advanced 3.4 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 (UAC = 230V, f = 50Hz). The adapter delivers an unstabilized DC voltage U= = 6V at IL = 0,4A to supply the Charging Unit. The adapter is connected to the Charger using socket BU1 of the Charger.
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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 generatedby the internal oscillator. External components belonging to the oscillator are the capacitors C4 , C5 and crystal Q1. Transistor T3 with additional components R8, R9, R16 and C6 form the necessary reset circuit. The UART, implemented in the controller, allows communication with the pager.
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LX2 plus / advanced and LX4 plus / advanced 3.4.6 Indicators Light emitting diodes D4, D8 or D9 indicate the operation conditions. The necessary current 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.
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LX2 plus / advanced and LX4 plus / advanced 4 Disassembly/ Assembly Of The Pager 4.1 LX2 plus / LX2 advanced 4.1.1 Removing / Replacing The Battery 4.1.2 • • • Slide the door lock away from the battery door. Slide the battery door until the locking tabs release. Lift the door up to open and remove the battery. • • Replace the battery with correct polarity ( + and – markings). Press down and slide the battery door until it is fully closed. Slide the door lock to its fully locked position.
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LX2 plus / advanced and LX4 plus / advanced B2270901 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig.
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LX2 plus / advanced and LX4 plus / advanced Fig. 11 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. Remove the shock pad. Use tweezers or similiar to pull the decoder board catch (refer 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).
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LX2 plus / advanced and LX4 plus / advanced 4.1.
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LX2 plus / advanced and LX4 plus / advanced 4.1.6 Spare Parts LX2 plus / LX2 advanced Item Part Number Description 1 2 3 4 GGM227.06.xx GGM227.02.xx MZS1.6M6X8+0.2 GGM227.36.xx + GGM227.39.xx GGM227.12.xx EBM227.15.xx EBM227.14.xx GGM227.10.xx GGM227.09.xx GGM227.08.xx GGM227.07.xx GGM227.28.xx GGM227.16.xx OKLCDM227.11.xx GGM227.03.xx UK-227.01.xx JSVM1.3VK1DVH GGM227.40.xx GGM227.17.xx GGM227.24.xx UK-227.yy.xx (yy=10....21) GGM227.01.xx GGM468.28.xx GGM468.28.xx GGM468.28.xx GGM227.13.xx BEM227.34.
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LX2 plus / advanced and LX4 plus / advanced 4.2 LX4 plus / LX4 advanced 4.2.1 Removing/ Replacing The Battery 4.2.2 • • • Slide the door lock away from the battery door (refer to Fig. 1). Slide and open the battery door as shown in figure 1. Remove the battery. • • Replace the battery with correct polarity (+ and – markings). Close and slide back the battery door. Slide the door lock to its fully locked position. Removing/ Replacing The Battery Door And Back Housing • • • • • • 4.2.
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LX2 plus / advanced and LX4 plus / advanced B2270901 Fig. 3 Fig. 4 Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 9 Fig.
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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). Remove 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.
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LX2 plus / advanced and LX4 plus / advanced 4.2.
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LX2 plus / advanced and LX4 plus / advanced 4.2.6 Spare Parts LX4 plus / LX4 advanced Item Part Number Description 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 GGM230.14.xx GGM230.16.xx GGM230.15.xx MZS1.6M6X8+0.2 EBM230.12.xx EBM230.13.xx GGM230.09.xx GGM230.08.xx GGM230.07.xx GGM230.18.xx GGM230.17.xx GGM230.22.xx GGM230.19.xx GGM230.21.xx GGM230.20.xx GGM230.23.xx OKLCDM230.02.xx GGM230.25.xx GGM230.27.xx UK-230.01.xx GGM230.24.xx UK-227.yy.xx (yy=10...21) GGM230.06.xx GGM230.05.xx GGM230.04.
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LX2 plus / advanced and LX4 plus / advanced 4.3 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. 1). When it is positioned between the snap and the catch 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. 2).
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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). 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 B2270901 Fig.
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LX2 plus / advanced and LX4 plus / advanced 4.3.3 Exploded View Diagram 4.2.4 Spare Parts Charging Unit Item 1 or 2 3 or 4 5 6 7 8 9 10 11 12 13 14 15 16 17 B2270901 Part Number Description GGM228.07.xx GGM228.18.01 BEM228.02.xx GGM228.06.xx GGM228.17.01 GGM228.09.xx GGM228.04.xx UF-228.06.xx GGM228.10.xx GGM469.13.xx ESDIMAB5SH FA-M228.01.xx ESBNCBU9050 ESVBUKLDSMT0202 GGM225.02.xx BEM227.34.xx EBM228.03.xx EDZM228.05.xx LKT11.8040/0.
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LX2 plus / advanced and LX4 plus / advanced Printed Circuit Boards 5.1 Receiver Schematic PCB No. 227.10.
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LX2 plus / advanced and LX4 plus / advanced Frequency Range Option Frequency C112 C113 C121 C131 C150 C154 C165 Range (pF) (pF) (pF) (pF) (pF) (pF) (pF) (MHz) L121 C126 (pF) (pF) A = 227.10.xx 138...141 10 3,3 3 10 10 0,75 22 330 22 B = 227.11.xx 141...144 10 3 2,7 - 10 1 22 330 20 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...
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5.2 LX2 plus / advanced and LX4 plus / advanced Parts Location Receiver PCB No. 227.10.
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LX2 plus / advanced and LX4 plus / advanced 5.3 B2270901 Bill Of Material Receiver PCB No. 227.10.xx Item Part Number Description C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C CSTAB4766 CS0603X7R103 CS0603NP0102 CSTAA10610 CSTR3-10TZVY2Z CS0603NP08p20.1 CS0603NP01000.1 CS0603NP09p10.1 CS0603NP08p20.1 CS0603NP07p50.1 CS0603NP06p80.1 CS0603NP06p20.1 CS0603NP05p60.1 CS0603NP05p10.1 CS0603NP03p30.1 CS0603NP03p00.1 CS0603NP02p70.1 CS0603NP02p40.
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LX2 plus / advanced and LX4 plus / advanced Item Part Number Description C 151 - C 153 C 154 (A) C 154 (B,D,E,F) C 161 C 163 C 164 C 165 (A,B) C 165 (C,D) C 165 (E,I) C 165 (F) C 165 (G,H) C 165 (J,K) C 165 (L) C 166 C 168 C 170 C 180 C 181 C 182, C 183 C 184 C 185 C 186 CR 102 E 101 J 101 L 120 L 121 (A ... F) L 121 (G ...
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LX2 plus / advanced and LX4 plus / advanced 5.4 B2270901 Decoder Schematic PCB No. 227.02.
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LX2 plus / advanced and LX4 plus / advanced 5.5 Parts Location Decoder PCB No. 227.02.
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LX2 plus / advanced and LX4 plus / advanced 5.6 Bill OF Material Decoder Board PCB No. 227.02.xx Item Part Number H1 C9, C14, C16 C24 C10 C1, C20, C22 CS0603Y5V105 C4 C5 C2 C17, C18 C23 C21 D1, D3, D5, D7 D4, D6, D9 D8 D10 ST1 AS5002811Y04 CS0603NP0150 CS0603X7R223 CS0603X7R47316 CS0603Y5V104 C3, C6, C11-C13, C15, C19 CS0805NP0102 CS0805X7R104 CSSEECEN0F204B CSTAA10610 CSTAB4766 CSTAC1076 DSDBAS16W DSDBAT54W DSZBZX84C2V4 DSZBZX84C5V6 ESFCI9190131411 GGM227.17.01 IS3, IS4 ICSCAT24WC256KI1.
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LX2 plus / advanced and LX4 plus / advanced 5.7 B2270901 Decoder Schematic PCB No. 227.01.
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LX2 plus / advanced and LX4 plus / advanced 5.8 B2270901 Parts Location Decoder PCB No. 227.01.
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LX2 plus / advanced and LX4 plus / advanced 5.9 Bill OF Material Decoder Board PCB No. 227.01.xx Item Part Number H1 AS5002811Y04 C9 CS0603NP0150 C7, C8 CS0603NP0220 C14, C16 CS0603NP0270 C24 CS0603X7R223 C1, C20, C22 CS0603Y5V104 C3, C6, C11-C13, C15, C19 CS0603Y5V105 C4 CS0805NP0102 C5 CS0805X7R104 C2 CSSEECEN0F204B C17, C18 CSTAA10610 C23 CSTAB4766 C21 CSTAC1076 D3, D5, D7 DSDBAS16W D4, D6 DSDBAT54W D8 DSZBZX84C2V4 D10 DSZBZX84C5V6 ST1 ESFCI9190131411 GGM227.17.01 GGM227.29.01 GGM227.30.
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LX2 plus / advanced and LX4 plus / advanced 5.10 B2270901 Decoder Schematic PCB No. 230.01.
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LX2 plus / advanced and LX4 plus / advanced 5.11 B2270901 Parts Location Decoder PCB No. 230.01.
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LX2 plus / advanced and LX4 plus / advanced 5.12 Bill OF Material Item PCB No. 230.01.xx Part Number C1, C20, C22 CS0603Y5V104 C14, C16 CS0603NP0270 C17, C18 CSTAA10610 C2 CSSEECEN0F204B C21 CSTAC1076 C23 CSTAB4766 C24 CS0603X7R223 C3, C6, C11 - C13, C15, C19 CS0603Y5V105 C4 CS0805NP0102 C5 CS0805X7R104 C7, C8 CS0603NP0220 C9 CS0603NP0150 D10 DSZBZX84C5V6 D3, D5, D7 DSDBAS16W D4, D6 DSDBAT54W D8 DSZBZX84C2V4 H1 AS5002811Y04 H2, H3 OSLA6504414R01 IS1 ICSPCF8563TF4 IS2 ICSUPD78F0034AY IS4 ICSCAT24WC256KI1.
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LX2 plus / advanced and LX4 plus / advanced B2270901 Content is subject to change without notice! * optional placement PCB No. 228.01.xx BR1 = close after flash programming BR2 open = relay active until reset BR2 closed = relay active for 10s Charger Unit Schematic Flash programming 5.
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LX2 plus / advanced und LX4 plus / advanced 5.14 Parts Location Charger Unit PCB No. 228.01.
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LX2 plus / advanced and LX4 plus / advanced 5.15 Bill Of Material Charger Unit Item Part Number FA-M228.01.01 GGM225.02.xx BU 1 ESVBUKLDSMT0202 BU 2 ESDIMAB5SH BU 3 ESBNCBU9050 C1 CS0603NP0102 C2 CS0805X7R104 C3 CS0805NP0102 C 4, C 5 CS0603NP0220 C6 CS0603Y5V105 C7 CS0805X7R105 C8 CS0805X7R104 C9 CSTAA10610 C 10, C 11 CS0603NP0102 C 12 CKE5.
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LX2 plus / advanced and LX4 plus / advanced B2270901 Item Part Number Description R 20 R 22 R 23 R 24 R 30 R 35 R 38 R 39 R 43 R 44 R 45 R 46 R 47 R 48 R 49 REL 1 SI 1 ST 2 T1 T3 T4 T 6, T 10, T 11 T 13 RK0207130R0 RKVVS05K14 RS12065560 RS12065680 RS08055470 RS06035222 RS06035103 RS06035473 RS12065270 RS08055473 RS06035152 RS06035473 RS06035102 RS06035101 RS08055332 ERA5WK SI0.
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5.16 B2270901 Charging Unit Schematic Content is subject to change without notice! BR1 open = flash programming BR1 closed = normal operation BR2 open = relay active until reset BR2 closed = relay active for 10s * optional placement Programming LX2 plus / advanced and LX4 plus / advanced PCB No. 228.06.
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LX2 plus / advanced and LX4 plus / advanced 5.17 B2270901 Parts Location Charging Unit PCB No. 228.06.
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LX2 plus / advanced and LX4 plus / advanced 5.18 Bill Of Material Charging Unit Item BU1 BU2 BU3 C1,10,11 C12 C2,8,13 C3 C4,5 C6 C9 D1 D2 D3,10 D4 D7 not placed D8 D9 IS1 IS2 L2,4,5 Q1 R1 R16 R2,13,15,17,41 R20 R22 not placed R3,6,10,33,48 R30 R31 R32 R34,54 R35,55 R45,53 R46 R47,50,51,52 R49 R56 not placed R57 R58 R59 R7 R8 R9 Rel1 SI1 ST2 T1, 52, 53 T3 T4 T50, 51 T6 B2270901 PCB No. 228.06.xx Part Number Description ESVBUKLDSMT0202 ESDIMAB5SH ESBNCBU9050 CS0603NP0102 CKE5.
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LX2 plus / advanced and LX4 plus / advanced 6 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. The contrast of the LCD can be altered during Testmode by pressing buttons Ù and Ú. Test Step 1 Display Line 1: Serial Number Line 2: Frequency 2 Firmware Issue,Controller Crystal, Addition.