Ericsson MPI-II VHF User Manual
LBI-38557A
Ericsson GE Mobile Communications Inc.
Mountain View Road•Lynchburg, Virginia 24502
Mobile Communications
SERVICE SECTION
FOR
MPI-II VHF P E RS ONAL RADIO
Printed in U.S.A.Copyright January 1991, Ericsson GE Mobile Communications, Inc.
Maintenance Man ual
AL W A YS remove the battery pack before disassembling the unit to avoid blowing the fuse or causing
other component damage.
Figure 1 - Removing The Battery Pack
Do not dispose of battery packs or batteries by
burning. To do so may cause an explosion.
LBI-38557 LBI-38557
®
is a Registered Trademark of Camcar
TABLE OF CONTENTS
INTRODUCTION
NOTE:TORX
Division of Textron Inc.
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 COVE R ....... ... ................. ... . ........................................................................................... . ... .... 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
This service section contains the necessary information
to align and troubleshoot the MPI -II (136-174 MHz) Personal Radio. This manual includes steps for disassembly and
procedures for replacing surface mount components and
integrated circuits. Preventive maintenance checks are provided as well as batter y service data. The tests and procedures 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 p ersonality EEPROM to tailor the operation of the radio to stipulated requirements. Instructions
are offered which include the use of an IBM compatible
personal computer and appropriate software. I f 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
BATTERY
CAUTION
1. Turn th e ra dio OFF.
2. Place thumb on bottom of battery pack and press
battery pack tow ard the top of the radio as shown in
Figure 1.
3. While pressing t he batte ry p ack to ward the t op of t he
radio, push bottom of battery pack away from the
radio.
S
E
R
V
I
C
E
S
E
C
T
I
O
N
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 INF ORMATION ................. ... . ........................................................................................... 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 - F
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 Optio n... . ... . ... .... . ... . ... . .... ... . ... . .... ... . ... . ... .... . ... . ... .... . ... . ... . .... ... . ... . .... ... . ... . . 8
(Input to U201) ....................................................................................................... 7
in
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 disassemble various assemblies from the radio.
TOOLS NEEDED
1. No. 7 TORX® screwdriver
®
2. No. 8 TORX
3. .050 hex t o o l
4. Flat blad e scr ewdriver
5. ST2312 spanner tool
6. ST2311 spanner tool
7. 5/16 wr en c h
screwdriver
WARNING
1
LBI-38557 LBI-38557
BNC CONNECTOR
1. Remo ve the N o. 3-48 x .125 s etscrew (D) using a 0.050
hex tool.
2. Unsolder the BNC cen ter pin f rom th e an tenna co ntact.
3. Remove the BNC connector.
UDC COVER
Remove the M2.5-0.45 screw using a flat blade screw-
driver or the edge of a coin.
TOP COVER
1. Pull off the two knob s from the ON/OFF/VOLUME
and the Squelch control.
2. Remove the Spanner nuts (E) using a Spanner Tool
ST2311.
3. Remove the 1/4-40 (F) nut using a 5/16 wrench.
PROGRAMMING
The MPI-II radio is programmed through a test cable
connected to the accessory c onnector located on the side of the
radio. Power is applied to the battery terminals located on the
rear radio assembly. B+ should be 7.5V for a 2 watt radio and
10.0V for a 4 watt radio.
Programming information must be written to the personality PROM before alignment or performance tests. This is
always done through the accessory connector and cable. This
cable may be attached to the radio and left connected during
the entire test procedure.
The assigned frequencies to be used should be programmed into the personality of each 2-channel radio:
First Transmit frequency Tx F1
First Receive frequency Rx F1
Second Transmit frequency Tx F2
Second Receive frequency Rx F2
The radio’s chosen options must alos be programmed in:
• Channel Guard (with C.G. frequency)
Figure 2 - Disassembly
FRONT COVER
1. Remove the battery as described in the previous
section.
2. Remove the two screws at (A) ( S ee F igure 2).
3. Carefully lift the front cover from the radio.
4. Unplug the cable betw een the front cover MIC B oard
and the T/R Board.
5. To gain access to the microproces sor, remove the
three screws at (B) and lift up the cover.
SYNTHESIZER BOARD
The Synthesizer Board may be separated from the
Transmit/Receive Board by prying the connectors straight
out from the pins.
CAUTION
When separating the Synthesizer and Transmit/Receive boards, care should be taken not to bend the
connector pins.
REAR COVER
1. Remove the screw a t (C) using a No. 7 TORX screwdriver (See Figure 2).
2. Remo ve the f our M 2 p an hea d scr ews, 3 at ( B) and 1
at (H), on the component side of the T/R Board using
a No. 7 TORX screwdriver.
3. The RF Board with the top cover and the side panel
attached may now be r em ov ed from the rea r c ov er.
4. Remove the top cover from the T/ R assembly .
SIDE PANEL
1. Remove the two Audio Jack Spanner nuts (G) using a
Spanner Tool ST2312.
2. Remove the side pan el f ro m th e T/R Asse m bly.
PERSONALITY PROGRAMMING
The MPI-II Personal Radio is equipped with a 256 x 8 bit
serial personality EEPROM. All cutomer information such as
the customer f requencies, customer tones and cus tomer options are stored in the EEPROM. The EEPROM contains all
information to tailor the operation of the radio to the user’s
requirements. The EEPROM is programmed by using an IBM
compatible personal computer with MSDOS, Interface B ox
19D438367G1, RS-232 Cable 19B235027P1, Programming
Cable TQ-3352 and Programming Software TQ-33 51.
• No Channel Guard
• Digital Channel Guard (with D.C.G. code)
• Type 9 9 Tone (with Tone A Frequency, Tone B F re-
quency)
• Talk-around (enable, disable)
• STE (enable, disable)
• Channel Busy Inhibit (enable, disable)
Detailed programming instructions should be followed as
found in the TQ-3351 Programmi ng Manual.
ALIGNMENT AND TEST
Initially, the Receiver of the MPI-II Personal Radio is
aligned and ready for use before leaving the factory. The
Transmitter is tuned at the high end of the band, with retuning
recommended for optimum operation when another frequency
is selected. This section provides procedures for aligning and
testing the MPI-II VHF (136-174 MHz) Personal Radio.
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