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Ericsson GE LBI-38378C Maintenance Manual

Vhf portable fm radio
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LBI-38378C
Mobile Communications
M-PA
VHF
PORTABLE FM RADIO
TABLE OF CONTENTS
REAR COVER ASSEMBLY . . . . . . . . . . . . LBI-38597
FRONT COVER ASSEMBLY (EARLIER)
AND CONTROL BOARD . . . . . . . . . . . . . LBI-38384
FRONT COVER ASSEMBLY (LATER)
LESS CONTROL BOARD . . . . . . . . . . . . . LBI-38834
CONTROL BOARD (LATER) . . . . . . . . . . . LBI-38828
VHF SERVICE SECTION . . . . . . . . . . . . . LBI-38385
Maintenance Manual

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Summary of Contents for Ericsson GE LBI-38378C

  • Page 1 LBI-38378C Mobile Communications M-PA PORTABLE FM RADIO TABLE OF CONTENTS REAR COVER ASSEMBLY ... . LBI-38597 FRONT COVER ASSEMBLY (EARLIER) AND CONTROL BOARD ... . . LBI-38384 FRONT COVER ASSEMBLY (LATER) LESS CONTROL BOARD .

  • Page 2: Table Of Contents

    Ericsson GE Mobile Communications Inc., at any time and without notice. Such changes will be incorporated into new editions of this manual. No part of this manual may be reproduced or transmit- ted in any form or by any means, electronic or mechanical, including photocopying and recording, for any purpose, without the express written permission of Ericsson GE Mobile Communications Inc.

  • Page 3: Specifications

    GENERAL Frequency Bands (FCC Type Acceptance Number) DOC Number Frequency Stability Channel Capacity Select Model Scan Model System Model Maximum Frequency Separation Channel Spacing Operating Temperature Range Maximum Relative Humidity Battery Voltage Dimensions (H x W x D) less battery, knobs and antenna with Extra High Cap.

  • Page 4: Options And Accessories

    LBI-38378 OPTIONS AND ACCESSORIES Radios, Antennas, Batteries Carrying Accessories Audio Accessories Chargers...

  • Page 5: Introduction

    FM radio. M-PA operation is highlighted by the radio’s programming versatility. This al- lows tailored operation of the portable radio to meet the needs of the radio system and the individual users. Three (3) different M-PA radio models are available: Select, Scan and System.

  • Page 6: Description

    This feature is selectable on a per channel basis. GE-STAR Compatibility - The radio can be programmed to transmit GE-STAR at PTT key, at PTT unkey, or both. 16,384 individual ID codes are available. Emergency...

  • Page 7: Illustrations Figure 1 - System Model

    LBI-38378 Figure 2 - Scan Model Figure 1 - System Model Figure 3 - Select Model Figure 4 - Side View (All Models)

  • Page 8: Rear Cover Assembly

    LBI-38378 REAR COVER ASSEMBLY The Rear Cover Assembly houses the RF Board in the die-cast aluminum case. The complete assembly consists of the VHF RF Board, aluminum case, top antenna jack, side (UDC) antenna jack and various hardware. The RF Board’s circuitry includes the transmitter, re- ceiver and the frequency synthesizer.

  • Page 9: Universal Device Connector

    Carrier Control Timer Backlight On or Off Alert Tones On or Off Switch Crystal Frequency Enabled or Disabled GE-STAR Enabled or Disabled GE-STAR sent with Channel Guard Channel on Default/Fixed Scan List* FEATURES PROGRAMMABLE ON A PER MODE BASIS* Channel Data...

  • Page 10: Figure 5 - Udc Pin-Out

    LBI-38378 NAME GROUND UDC RX AUDIO SWBATT EXT PTT TX DATA RX DATA SPARE UDC VOLT UDC MUTE EXT MIC HI EXT EMER UDC DISCR TABLE 2 - UDC PIN FUNCTIONS INPUT OR OUTPUT ------- Output Output Input Input Output ------- Output Output...

  • Page 11: Operator Manual

    BATTERY PACKS Only battery packs identified with a green latch shall be used with a portable radio that is rated and labeled as Fac- tory Mutual Intrinsically Safe. Use of non-specified battery packs voids Factory Mutual approval. The following battery...

  • Page 12: Maintenance

    Verify the contacts are clean and free of corrosion. Mechanical Since portable radio units are subject to shock and vi- bration, check for loose plugs, knobs, screws, etc. Transmitter Check Check transmit frequency and deviation.

  • Page 13: Disassembly/ Reassembly

    DISASSEMBLY / REASSEMBLY In the event internal service is required, disassemble the radio in accordance with the following outlined steps. See Figures 6 - 10. Reassemble the unit by following the steps in reverse order. Observe screw lengths and do not over tighten the screws when reassembling the unit.

  • Page 14: Figures 7, 8 - Disassembly/Reassembly Diagrams

    LBI-38378 RF Board Access Holes are located in the RF Board shield for alignment of the Reference Oscillator (U3), Modulation Balance pot (R18), VCO Modulation pot (R19), 2nd Local Oscillator Adjustment (T1), and the Quadrature Detector Adjustment (T2). To align these items, shield removal is not necessary. If removal of the RF Board from the case is necessary, first remove the UDC antenna jack and the top RF antenna jack with appropriate spanner wrenches.

  • Page 15: Figures 9, 10 - Disassembly/Reassembly Diagrams

    TION: Installation of screws that are longer than the origi- nals may damage the LCD Board, flex circuits or the threads. To remove the Control Board, remove the Torx screw (E) in the lower left-hand corner that supplies battery power to the board.

  • Page 16: Figure 11 - Rear Cover Assembly Block Diagram

    LBI-38378 BLOCK DIAGRAM Figure 11 - Rear Cover Assembly Block Diagram...

  • Page 17: Figure 12 - Front Cover Assembly (Earlier) And Control Board Block Diagram

    LBI-38378 BLOCK DIAGRAM Figure 12 - Front Cover Assembly (Earlier) And Control Board Block Diagram...
  • Page 18 LBI-38378 Later Front Cover Assembly Keypad Flex Removal To remove the Keypad Flex, first remove the UDC Flex/UDC/Monitor Button/PTT Switch assembly as pre- viously stated. Next remove the screw securing the emer- gency switch support (G) then remove the support. Remove the knobs using the hex driver.

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M-pa

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