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Mobile Communications

MAINTENANCE MANUAL
FOR

GENERAL ELECTRIC
33-50 MHz
Beacon



Monitor Pager

Maintenance Manual

LBI-31482

Printed in U.S.A.

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Summary of Contents for LBI-31482

Page 1: ...Mobile Communications MAINTENANCE MANUAL FOR GENERAL ELECTRIC 33 50 MHz Beacon Monitor Pager Maintenance Manual LBI 31482 Printed in U S A ...

Page 2: ... HI LO 150 Milliwatts 20 Milliwatts TYPICAL SPECIFICATIONS CONT Current Drain at 2 5 Volts Standby Receive 5 2 milliamperes 105 milliamperes Battery Life Nicke1 Cadmium Mercury 25 hours 115 hours Modulation Acceptance 8 kHz Channel Spacing 20 kHz Selectivity EIA 65 dB Paging Sensitivity 7 uV meter Usable Sensitivity 12 dB SINAD 18 uV meter Spurious Response 56 dB Frequency Stability 5 PPM Audio Di...

Page 3: ...nickel cadmium batteries in the radio as well as spare nickel cadmium batteries Temperature characteristics of nickel cadmium batteries prevent a full charge at temperature extremes For maxi mum capacity recharge the batteries at room temperatures between 65 to 85 Fahrenheit To use the charger connect the power cable to an appropri ate power source Place the Pager into the charger The red light wi...

Page 4: ...lator and mixer The crystal for the oscillator is X2 The oscillator oper ates at 10 245 MHz for low side injection of the 2nd IF stand ard or 11 155 MHz for high side injection for those radios determined to be operating on a tweet frequency This fre quency is mixed with the 10 7 MHz input to provide the 455 kHz 2nd IF frequency The output of Al is coupled through ceramic filter FL2 which provides...

Page 5: ...nted to ground for 50 milliseconds at 100 millisecond intervals by Q59 to pro vide the interrupted alert tone The alert tone is then applied to A51 5 The same time the tone alert oscillator starts A55 5 and A55 7 go low The low at A55 7 is applied to amplifier A51 9 turning the amplifier on so that messages can be heard GROUP CALL In group call applications only Tone B is applied to the re ceiver ...

Page 6: ...67 5 Hz 517 5 Hz 562 5 Hz 697 5 Hz C0 C1 C2 C3 C4 C5 C6 C7 C8 C9 667 5 Hz 712 5 Hz 772 5 Hz 817 5 Hz 862 5 Hz 907 5 Hz 952 5 Hz 532 5 Hz 577 5 Hz 622 5 Hz Diagonal Tone 742 5 Hz QUIK CALL II FORMAT INDIVIDUAL CALL Tables 3 and 4 are used to determine the Quik Call II tone frequencies The first digit of the code determines the tone groups used in the code See Table 3 Then Table 4 is used to deter m...

Page 7: ...lip leads on the other end 2 Remove printed hoard assembly from case and insert fully charged batteries 3 Connect the shield clip lead of the coaxial cable to the negative battery terminal This terminal connects directly to chassis ground 4 Place the center conductor lead of the coaxial cable beneath the pager and lay pager flat on work bench cable lead should be insulated from radio circuitry 5 C...

Page 8: ...MS across the 4 ohm speaker Set the Power Volume switch to LO The audio output level should drop 10 dB 2 dH 16 Set up as in Step 11 above Adjust squelch control RV52 for an audible level of approximately 12 dB SINAD squelch opening 17 Slide S53 to SEL position and push S52 to reset pager 18 Modulate the RF generator with the proper tone sequence from the 2 tone generator Verify the alignment and p...

Page 9: ...RECEIVER ER 145 A1 B1 C1 D1 TROUBLESHOOTING PROCEDURE LBI 31482 LBI 31482 8 ...

Page 10: ...RECEIVER ER 145 A1 B1 C1 D1 TROUBLESHOOTING PROCEDURE LBI 31482 LBI 31482 9 ...

Page 11: ...RECEIVER ER 145 A1 B1 C1 D1 TROUBLESHOOTING PROCEDURE LBI 31482 LBI 31482 10 ...

Page 12: ...SOLDER SIDE ISSUE 1 OUTLINE DIAGRAM LBI 31482 LBI 31482 11 ...

Page 13: ...COMPONENT SIDE OUTLINE DIAGRAM LBI 31482 LBI 31482 12 ...

Page 14: ...RECEIVER ER 145 A1 B1 C1 D1 SCHEMATIC DIAGRAM LBI 31482 LBI 31482 13 ...

Page 15: ...lum Capacitor 16V 0 68 uF 2014006501 C78 C79 Ceramic Capacitor 25V 4700 pF 2001902321 C80 Tantalum Capacitor 35V 0 022 uF 2014007501 C81 Tantalum Capacitor 4V 22 uF 2013043501 C82 Aluminum Capacitor 4V 47 uF 2029501803 C83 Ceramic Capacitor 50V 1000 pF 2001400321 C84 Tantalum Capacitor 6 3V 4 7 uF 2013032501 C85 Tantalum Capacitor 4V 33 uF 2013044501 C86 Tantalum Capacitor 16V 2 2 uF 2013023501 C8...

Page 16: ...BLE SCREW 4MH 0634 14 ANTENNA CONTACT 4MB 6644 15 CLIP 3MZ 1894 16 NON SLIDING PARTS 4MZ 1258 17 ANTENNA PLATE 4MB 6643 18 SPRING 4MB 5960 19 CLIP PIN 4MH 0829 20 BATTERY CASE 3MZ 2047 21 CONTACT 4MB 4287J 22 CONTACT POINT 4MB 7070 23 CUSHION 4MZ 2085 24 PARTITION PLATE 4MZ 2190 25 BATTERY CONTACT 4MB 7073 26 INSULATOR 4MZ 1936 27 ANTENNA CONTACT POINT 4MH 0841 28 TUNER CASE ASSEMBLY 4MB 5783 29 S...

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