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Ericsson GE LBI-4622B Maintenance Manual

406-420 & 512 mhz, 40-watt transmitter
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LBI-4622B
Mobile Communications
MASTR II
MAINTENANCE MANUAL
406-420 & 512 MHz,
40-WATT TRANSMITTER
Printed in U.S.A.
Maintenance Manual

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Summary of Contents for Ericsson GE LBI-4622B

  • Page 1 LBI-4622B Mobile Communications MASTR II MAINTENANCE MANUAL 406-420 & 512 MHz, 40-WATT TRANSMITTER Printed in U.S.A. Maintenance Manual...

  • Page 2: Table Of Contents

    LBI-4622 LBI-4622 SPECIFICATIONS * TABLE OF CONTENTS Power Output Page 406-420 MHz & 450-470 MHz 40 Watts (Adjustable from 12 to 40 Watts) 470-494 MHz 38 Watts (Adjustable from 12 to 38 Watts) DESCRIPTION ........... . . 494-512 MHz 35 Watts (Adjustable from 12 to 35 Watts) CIRCUIT ANALYSIS .

  • Page 3: Description

    LBI-4622 LBI-4622 Centralized metering jack J103 is provided fro use with quency select or switch on the control unit. In single-fre- DESCRIPTION GE Test Set Model 4EX3A11 or Test Kit 4EX8K12. The quency radios, a jumper from H9 to H10 in the control unit test set meters the modulator, multiplier and amplifier stages, connects terminal 6 of the ICOM to A-.

  • Page 4: Audio Ic

    LBI-4622 LBI-4622 Audio IC Buffer, Multipliers & Amplifier The transmitter audio circuitry is contained in audio IC Buffer Q105 is saturated when no RF signal is present, U101. A simplified drawing of the audio IC is shown in Fig- Applying an RF signal to Q1O5 provides a sawtooth wave- ure 4.

  • Page 5: Power Control Circuit

    LBI-4622 LBI-4622 The output of Q201 is coup led through a 20-ohm collec- and C258) and added to the output of Q206 in power com- When the heatsink temperature decreases below 100°C, the To service the transmitter from the bottom: tor matching network (C212, C213, C4219 and L203) to the biner network R212 and W233.

  • Page 6: Pa Transistor Replacement

    LBI-4622 LBI-4622 To remove the PA assembly: care not to use excessive heat that causes the For transmitters with Channel Guard, set Channel printed wire board runs to lift up from the board. Guard MOD ADJUST R105 for zero tone devia- Remove the PA top cover and unplug the exciter/PA Check for shorts and solder bridges before applying tion.

  • Page 7: Figure 9 - Frequency Characteristics Vs. Temperature

    LBI-4622 LBI-4622 MASTR II ICOMs should be reset only when the fre- Maintain the radio at 26.5°C (±5°C) and set the quency shows deviation in excess of the following limits: oscillator to desired frequency, or ±0.5 PPM, when the radio is at 26.5°C (79.8°F). 2.

  • Page 8: Alignment Procedure

    LBI-4622 LBI-4622 TRANSMITTER ALIGNMENT STEP METER TUNING METER PROCEDURE POSITION CONTROL READING EQUIPMENT REQUIRED T103 See Procedure Tune T103 for the maximum meter reading on the GE Test Set Model 4EX3A11 or Test Kit 4EX8K12. (MOD-1) lowest frequency, After tuning T103 for maximum, turn the slug 1/8 of a turn clockwise (increasing A 50-ohm wattmeter connected to antenna jack J906.

  • Page 9: Test Procedures

    LBI-4622 LBI-4622 Key the transmitter and adjust Deviation Meter to car- TEST PROCEDURES TEST EQUIPMENT REQUIRED rier frequency. These Test Procedures are designed to assist you in serv- for test hookup as shown: Deviation leading should be ±4.5 kHz in radios with- icing a transmitter that is operating-- but not properly.
  • Page 10 LBI-4622 LBI-4622...

  • Page 11: Troubleshooting

    LBI-4622 LBI-4622 TROUBLESHOOTING PROCEDURE STEP 1 - QUICK CHECKS METER PROBABLE DEFECTIVE STAGE POSITION GE TEST SET HIGH LOW METER ZERO METER READING METER READING READING EXCITER Q102, 10- T103, T103, (MOD-1) Volt Regulator CV103, C104 CV103, CR104, Q104 Q105, Q106, Q105, Q106 Q105, Q106, (MULT-1)
  • Page 12 LBI-4622 LBI-4622 TROUBLESHOOTING PROCEDURE 406-512 MHz, 40-WATT TRANSMITTER Issue 2...

  • Page 13: Outline Diagram

    LBI-4622 LBI-4622 OUTLINE DIAGRAM EXCITER BOARD SOLDER SIDE (19D416850, Sh. 2, Rev. 3) COMPONENT SIDE (19D416850, Sh. 2, Rev. 3) (19D416850, Sh. 3, Rev. 3) 406-512 MHz, 40-WATT TRANSMITTER...
  • Page 14 LBI-4622 LBI-4622 OUTLINE DIAGRAM PA BOARD COMPONENT SIDE (19D417162, Sh. 2, Rev. 3) (19D417162, Sh. 3, Rev. 5) SOLDER SIDE (19D417162, Sh. 2, Rev. 3)

  • Page 15: Exciter

    LBI-4622 LBI-4622 PARTS LIST...
  • Page 16 LBI-4622 LBI-4622 PARTS LIST...
  • Page 17 LBI-4622 LBI-4622 SCHEMATIC DIAGRAM 406-512 MHz, EXCITER BOARD 19D416859G5-G8...
  • Page 18 LBI-4622 LBI-4622 SCHEMATIC DIAGRAM 406-512 MHz, EXCITER BOARD 19D416859G5-G8...

  • Page 19: Power Amplifier

    LBI-4622 LBI-4622 SCHEMATIC DIAGRAM 406-512 MHz, 40-WATT POWER AMPLIFIER 19C320620G5-G8...
  • Page 20 LBI-4622 LBI-4622 SCHEMATIC DIAGRAM 406-512 MHz, 40-WATT POWER AMPLIFIER 19C320620G5-G8...
  • Page 21 LBI-4622 LBI-4622 SCHEMATIC DIAGRAM PARTS LIST 406-512 MHz, 40-WATT POWER AMPLIFIER 19C320620G5-G8...
  • Page 22 LBI-4622 LBI-4622 PARTS LIST...
  • Page 23 LBI-4622 LBI-4622 PARTS LIST...
  • Page 24 LBI-4622 LBI-4622...

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