Ericsson DUAL FORMAT MDX LBI-38848A Maintenance Manual
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Ericsson DUAL FORMAT MDX LBI-38848A Maintenance Manual

806 - 870 mhz mobile
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LBI-38848A
Mobile Communications
DUAL FORMAT MDX™
806 - 870 MHz MOBILE
TABLE OF CONTENTS
RF BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . LBI-38849
SYSTEM BOARD . . . . . . . . . . . . . . . . . . . . . . . LBI-38842
AUDIO/LOGIC BOARD . . . . . . . . . . . . . . . . . . . LBI-38843
AUDIO AMPLIFIER BOARD . . . . . . . . . . . . . . . . LBI-38844
FRONT CAP ASSEMBLY . . . . . . . . . . . . . . . . . . LBI-38850
PA BOARD . . . . . . . . . . . . . . . . . . . . . . . . . . LBI-38302
SERVICE SECTION . . . . . . . . . . . . . . . . . . . . . LBI-38851
Printed in U.S.A
Maintenance Manual

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Summary of Contents for Ericsson DUAL FORMAT MDX LBI-38848A

  • Page 1 LBI-38848A Mobile Communications DUAL FORMAT MDX™ 806 - 870 MHz MOBILE TABLE OF CONTENTS RF BOARD ......LBI-38849 SYSTEM BOARD .

  • Page 2: Specifications

    LBI-38848 LBI-38848 SPECIFICATIONS* TABLE OF CONTENTS GENERAL Page 13.8 Volts ±20% Operating Voltage SPECIFICATIONS ........... 1 Battery Drain GENERAL DESCRIPTION .

  • Page 3: General Description

    Display Board for the LCD. The synthesizer circuit generates all transmit and re- Carrier Control Timer (CCT) The Ericsson GE Dual Format MDX™ Mobile Radio is ceive RF frequencies. The synthesizer frequency is control- SYSTEM BOARD a synthesized, wideband radio that uses integrated circuits led by the microprocessor located on the Audio/Logic Board.

  • Page 4: Hardware And Hardware Options

    LBI-38848 LBI-38848 Squelch Tail Elimination (STE) EXTERNAL SPEAKER OPTION Table 2 - Digital Channel Guard Codes PRIM. PRIM. PRIM. PRIM. STE is used with tone and digital Channel Guard to External Speaker and Cable Option PMZM1T provides EQUIV. CODE EQUIV. CODE EQUIV.

  • Page 5: Conventional Mode

    LBI-38848 LBI-38848 When receiving a channel assignment (incoming call), GE-MARC the monitoring mobile immediately switches over to the assigned voice channel and waits for a high speed data The GE-MARC trunked mobile radio system consists confirmation message. Upon receipt of this message, the of a repeater for each channel and the users’...

  • Page 6: Radio Operation

    LBI-38848 LBI-38848 successful, the unit becomes READY. Otherwise, the unit is RADIO OPERATION IDLE or IDLE/WAIT after all channels are tried. A complete set of operating instructions for the Dual Ready Mode Format MDX are provided in LBI-38846 and are provided with each radio.

  • Page 7: Alert Tones

    PARTS LIST LBI-38848 LBI-38848 OUT-OF- A single, low-pitched tone sounds imme- CARRIER (GE-MARC and Conventional operation.) ALERT TONES DUAL FORMAT MDX™ RADIO ASSEMBLY RANGE/ diately after the PTT key is pressed indi- CONTROL A pulsed-tone signal is sounded for a pre- ISSUE 1 SYSTEM cating the radio is out of range of the...

  • Page 8: Assembly Diagram

    ASSEMBLY DIAGRAM LBI-38848 LBI-38848 (19D904183, Sh. 1, Rev. 1)
  • Page 9 ASSEMBLY DIAGRAM LBI-38848 LBI-38848 (19D904183, Sh. 2, Rev. 2)
  • Page 10 ASSEMBLY DIAGRAM LBI-38848 LBI-38848 (19D904133, Sh. 1, Rev. 2)

  • Page 11: Interconnection Diagram

    INTERCONNECTION DIAGRAM LBI-38848 LBI-38848 (19D904133, Sh. 2, Rev. 2)
  • Page 12 INTERCONNECTION DIAGRAM LBI-38848 LBI-38848 (19D904133, Sh. 3, Rev. 2)

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