Ericsson MPI-II VHF Introduction, Disassembly Procedure, Table of Contents, Tools Needed, Battery

LBI-38557 LBI-38557

TABLE OF CONTENTS
	Page
INTRODUCTION	1
DISASSEMBLY PROCEDURE	1
TOOLS NEEDED	1
BATTERY	1
FRONT COVER	2
SYNTHESIZER BOARD	2
REAR COVER	2
BNC CONNECTOR	2
UDC COVER	2
TOP COVER	2
SIDE PANEL	2
PERSONALITY PROGRAMMING	2
PROGRAMMING	2
ALIGNMENT AND TEST	2
TEST EQUIPMENT	3
TEST SETUP	3
TRANSMITTER ALIGNMENT	3
RECEIVER ALIGNMENT	5
TROUBLESHOOTING	5
TRANSMITTER	5
RECEIVER	6
SYNTHESIZER	6
COMPONENT REPLACEMENT	7
SURFACE MOUNT COMPONENTS	7
SURFACE MOUNT REMOVAL	7
SURFACE MOUNT COMPONENT REPLACEMENT	8
SURFACE MOUNTED INTEGRATED CIRCUIT REPLACEMENT	8
MODULE REPLACEMENT	8
PREVENTIVE MAINTENANCE	8
BATTERY INFORMATION	8
REDUCED CAPACITY	8
MODIFICATION INSTRUCTIONS	9
FIGURES
Figure 1 - Removing The Battery Pack	1
Figure 2 - Disassembly	2
Figure 3 - Test Setup	3
Figure 4 - Location Of Tuning Controls And Test Points	4
Figure 5 - Reference Oscillator (Input To PLL U201)	7
Figure 6 - Fin (Input to U201)	7
Figure 7 - Remp (Generated In U201)	7
Figure 8 - SYN EN (Input To Pin 13 Of U201)	7
Figure 9 - Typical Ni-Cad Cell Discharge Curve	8
Figure 10 - Alternate IF Option	8

INTRODUCTION

This service section contains the necessary information to align and troubleshoot the MPI-II (136-174 MHz) Per- sonal Radio. This manual includes steps for disassembly and procedures for replacing surface mount components and integrated circuits. Preventive maintenance checks are pro- vided as well as battery service data. The tests and proce- dures in this manual are intended to be used by a qualified service technician.

In order to perform many of the following alignments, tests and troubleshooting checks it will be necessary to program the radio’s personality EEPROM to tailor the op- eration of the radio to stipulated requirements. Instructions are offered which include the use of an IBM compatible personal computer and appropriate software. If the radio is properly functioning and has a preprogrammed personality, alignment procedures can be initiated directly.

Conventional testing using the recommended alignment procedures will verify proper operation of all of the radio’s circuitry, with the following exceptions:

∙Data modulation circuitry in transmit mode

∙Data demodulation circuitry in receive mode

DISASSEMBLY PROCEDURE

The following section describes how to gain access to the Transmit/Receive Board and the Synthesizer Board for servicing. This section also provides the procedures to dis- assemble various assemblies from the radio.

TOOLS NEEDED

1.No. 7 TORX® screwdriver

2.No. 8 TORX® screwdriver

3..050 hex tool

4.Flat blade screwdriver

5.ST2312 spanner tool

6.ST2311 spanner tool

7.5/16 wrench

NOTE:TORX® is a Registered Trademark of Camcar Division of Textron Inc.

BATTERY

CAUTION

ALWAYS remove the battery pack before disassem- bling the unit to avoid blowing the fuse or causing other component damage.

1.Turn the radio OFF.

2.Place thumb on bottom of battery pack and press battery pack toward the top of the radio as shown in Figure 1.

3.While pressing the battery pack toward the top of the radio, push bottom of battery pack away from the radio.

Figure 1 - Removing The Battery Pack

WARNING

Do not dispose of battery packs or batteries by burning. To do so may cause an explosion.

S E R V I C E

S

E C T I O N

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