Ericsson M-RK, M-RK I, M-RK II & Scan Maintenance Manual
Maintenance Manual
LBI-38735B
M-RK
UHF
PERSONAL TWO-WAY FM
RADIO COMBINATION
ericssonz
TABLE OF CONTENTS
Service Assemblies...................................................................LBI-3 8746
Service Section............. ... .........................................................LBI-3 8740
Disassembly and Assem bly.............. ........ ........ ........... ........ .....LBI-38741
LBI-38735
NOTICE!
This manual cove rs Eri c sson and Gene ra l Elect ric pro duc ts m an ufa ctured and sold by Eri csson In c.
NOTICE
Repairs to this equipment should be made only by an authorized service technician or facility designated by the supplier. Any
repairs, altera tions or substi tut io n of rec om m e nde d pa rts m ad e by the user to this eq uipment not approved by the ma nufa c tu re r
could voi d the user’s authority to opera te the equipment in add it ion to the ma nufacture r’ s w ar ra nty.
NOTICE
The software contained in this device is copyrighted by Eri csson Inc. Unpublished rights ar e reserv ed under the copyr ight
laws of the United States.
This manual is published by Ericsson Inc., without any warranty. Improvements and changes to this manual necessitated by
typographical errors, inaccuracies of current information, or improvements to programs and/or equipment, may be made by
Ericsson Inc., at any time and without notic e. Such cha nge s will be inco rpor ta ted int o new ed it ion s of this manual . No part of
this manual may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying
and recording, for any purpose, without the express written permission of Ericsson Inc.
Copyright © May 1993, Ericsson GE Mobile Communications Inc.
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LBI-38735
TABLE OF CONTENTS
Page
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4, 5
DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
RADIO ASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
TRANSMIT CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
RECEIVE CIRC UIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
FREQUENCY SYNTHESIZER . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
LOGIC CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
SYSTEM ANALYSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
RADIO BOARD ASSEMBLY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Transmit Circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Power Amp li fier Module (U7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
LPF/DC/T/R SW Module (U8) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Receive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
RF Amplifie r/Mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
First IF Amplifier . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Second IF Amplifier/Discriminator (U11) Non-switchable . . . . . . . . . . . . . . . . . . . 9
Second IF Amplifier/Discri m ina t or (U11) Switchable . . . . . . . . . . . . . . . . . . . . . . 9
Synthesiz e r Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Phase-Lock -Loop Module (U2) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Voltage-Contro ll ed Oscillator (U5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
VCTCXO Reference Oscillator (Z1) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
LOGIC CIRCUIT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Control Board Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Microcomputer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2
Flash E
RAM (U5) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
E
Digital Signal Processor (DSP)(U3) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Voltage Regulator (U9, U10) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Audio Am pl ifi er (U11) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Audio Signal Processor (ASP)(U7) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
LED Flex Asse mb ly (M-RK I) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
LCD/KB Flex Assembly (M-RK I I & Scan) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Keypad (M-RK I I & Scan) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
UDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
PROM (U4) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2
PROM (U6) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
INITIAL ADJUSTME NT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Transmit Circuit Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Receive Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Synthesiz e r Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3
LBI-38735
PREVENTIVE MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
DISASSEMBLY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
REPLACEMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
TROUBLESHOOTI NG PR OCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
WEATHERPROOF INTEGRIT Y . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
DIAGRAMS
Figure 1 - M-RK I Cont rols and Acc essories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 2 - M-RK II & Scan Controls and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 3 - Radio Bloc k Diagram VHF/UHF (No n-switchable) . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 4 - Radio Block Diagram VHF/UHF (Swi tc ha bl e ) . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 5 - M-RK I (Conv/EDACS) Lo gic Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 6 - M-RK I (AEGIS) Logic Bloc k Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
Figure 7 - M-RK II & Scan (Conv/ EDACS) Logic Block Diagram . . . . . . . . . . . . . . . . . . . . . . 14
Figure 8 - M-RK II & Sca n (AEGIS) Logic Block Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Figure 9 - Power Amplifier (PA) UHF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 10 - LPF/ DC/ T/R SW Modu le (U8) VHF/UHF . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 11 - RF Amplifier/Mixer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 12 - First IF Amplifie r . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 13 - Second IF Am plifier/Discriminat or (Non-switchable) . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 14 - Second IF Amplifier/Discri minator (Swit ch able) . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 15 - Synthesizer . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
TABLE OF CONTENTS (CONT.)
Antenna . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Mechanica l Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Alignment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Frequency Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
SYSTEM FCC DOC
Regulator y Num ber AXATR-202-A5(403 - 430 MHz) TR-202
Frequency Range 403 - 430 MHz
Frequenc y Stab il ity ±5 ppm
Dimensions (HxWxD) w/battery (Typical)
M-RK I (Medium Capacity Bat tery) 161.8 mm x 68 mm x 30 mm
(High Capacity Battery) 176.8 mm x 68 mm x 30 mm
(Extra High Capaci ty Ba t te ry) 194.3 mm x 68 mm x 30 mm
4
SPECIFICATIONS *
AXATR-202-A5 (440 - 470 MHz) TR-202
AXATR-202-A5 (470 - 500 MHz) TR-202
AXATR-202-A5 (378 - 403 MHz)
440 - 470 MHz
470 - 500 MHz
378 - 403 MHz
±2 ppm (switchable)
LBI-38735
M-RK II & Scan (Medium Capa ci ty Batte ry ) 161.8 mm x 68 mm x 40.6 mm
(High Capacity Battery) 176.8 mm x 68 mm x 40.6 mm
(Extra High Capacity Battery) 194.3 mm x 68 mm x 40.6 mm
Weight
M-RK I (Medium Capaci ty Batte ry) 15.2 ounces
(High Capacity Batte ry) 19.2 ounces
(Extra High Capac i ty Ba ttery) 21.2 ounces
M-RK II & Scan (Me dium Capacity Battery) 16.4 ounces
(High Capacity Bat te r y) 20.4 ounces
(Extra High Capacity Battery) 22.4 ounces
Operable Temperature Range -30° to +60° (-22° to + 1 4 0 ° F)
TRANSMIT
RF Power Output 0.5 to 5 watts
Spurious Emissions -75 dBc
Maxim um Deviation ±5 kHz
±2.5 kHz (switcha bl e, narr owba nd m ode )
FM Hum & Noise -45 dB non-swit c hable , switcha bl e (wideba nd mod e)
-39 dB switcha ble (na rr owba nd mode)
Audio Distort ion <3% (60% Modulation)
Frequenc y Stab il ity ±5 ppm (-30°C to +60°C )non -swit ch ab le
±2 ppm (-30°C to +60°C )swit ch ab le
RF Load Impeda nc e 50 ohms
Microphon e Sensit ivit y Less than 90 dB SPL (EIA 60% MDD)
Maximum At ta c k Time 25 millisec onds (PT T Pushed)
Audio Frequenc y Re spon se Wit hi n +1 and -3 dB of a 6 dB/octave pre -e mphasis from 300 Hz to
3000 Hz. Non-swit chab le , switc ha bl e (wide ba nd mode)
Wit hi n +1 and -3 dB of a 6 dB/oc ta ve pre -e m pha sis from 300 Hz to
2550 Hz. Switc habl e (narrowb an d mode ).
RECEI VE
Sensitivity (12 dB SINAD) -116 dBm
Spurious Response -72 dB (minimum)
Selectivity -75 dB (25 kHz)
-60 dB (12.5kHz ) switch ab le units onl y
Squelch Sensitivity 6 dB SINAD
Distortion (EIA 0.5 watt) 5%
Audio Freque nc y Respon se W it hi n +1 and -3 dB of a 6 dB/oc ta ve de-e mp ha sis from 300 Hz to
3000 Hz.
NOTE
Non-switchable UHF units are designed for 25 kHz channel spacing only. Switchable
units with the proper software and feature encryption can be used in 12.5 kHz channel
spa c ing system.
* These specifications are intended primarily for use by service personnel. Refer to the appropriate Spedivication Sheet for
comple t e sp e c ifi c at ions.
5
LBI-38735
DESCRIPTION
The M-RK Personal Radio is a high-quality, high-performance FM radio. The radio is synthesized and operates in
both trunked and conventional communication systems. The
trunked mode allows selection of either a communications
group or an individual radio within a system. Both the selected group and the individual radio are secured through
digital signaling.
In the conventional mode, the user selects a channel and
directly c o mmu nicate s o n t h at chan n el . A ch an nel is a t r an s mit/re c e ive ra dio freque nc y pa i r.
A group consists of several users with a common group
identification (ID). A radio may have several groups, but the
selected group determines who the unit can call at any specific time. In the trunked mode, a set of groups which communicate on a set of channels is called a system. In the
conventional mode, a system is a set of channels. A system
may consist of all trunking groups and channels, all conventional channels, or a mixture of both.
The M-RK Personal Radio is designed to operate in a
Digital Trunking System or as a conventional radio providing the following features.
In trunked mode:
• Programmable Multiple System Capability -- The
radio can operate on different trunked sites or on
different systems at the same site.
• Multiple Group Capability -- The radio can
communicate on several Groups within one trunked
system.
• Automatic Power Levels -- The desired power level on
each channel can be programmed into the radio
personality. Power level is automatically selected
dependent on the channel.
• Emergency feature -- An emergency group can be
programmed into the radio. This group is selected by
pressing the EMR button. This allows a user to
quickly reach this group and initiate the M-RK
emergency signalling .
• Simple Remote Control Capability -- A
speaker/microphone (which can also control PTT and
the volume level) can be connected through the UDC
(Universal De vi ce Connector).
• Surveillance Feature -- The display backlighting
(M-RK II & Scan) may be programmed on or off per
group. The side-tone beep, related to the operation of
the radio controls, is also capa ble of being disable d on
a group-by-group basis.
• Programmable through UDC -- The entire personality
of the radio is programmed through four connections
of the UDC.
• 3 LED (including 2 bi-color LEDs) Display (M-RK I)
-- These LEDs are used to exhibit the condition of the
radio. It shows Channel Guard on/off, transmit mode,
battery condition, scan mode, channel busy, and
digital/cle a r mo de condit io n, etc.
• 16 Character Dot Matrix Alphanumeric Crystal
Display (M-RK II & Scan) -- This display is used to
exhibit the condition of the radio. It shows channel
designation, Channel Guard or Digital Channel Guard
on/off, transmit mode, volume lev el , battery condition,
channel busy, and high/low power output, etc.
• Group Call -- The M-RK has the capability of
simulta ne ou sly c al ling a ll uni ts wit hin a group.
• Programmable Carrier Control Timer -- Personality
information includes an optional period of transmit
time from 15 to 120 seconds. After the timer expires,
the unit will automatically unkey and provide an alert
tone. This feature is re-initiated on every PTT and the
alert ton e is re moved upon rele a se of the PTT.
• Minimum Volume Level -- Personality information
includ es a minimum volum e level.
• Programmable Squelch -- The noise squelch opening
threshol d can be pro gra mme d fo r each c ha nne l.
• Receive Mode Lock Out -- In normal trunked
operation, the radio will not transmit while in the
rece ive mode.
6
In conven tional mode:
• 16/192-Channel Capability -- Channel designation
can be a mixture of numerics (0-192) and
alphanumerics displayed through the LCD. Channel
control can come from the channel rotary switch, the
emergency channel feature, or the front keypad.
• Programmable Multi-Tone Channel Guard (CTCSS)
Encode/Decode -- Channel Guard tone frequencies
within the range of 67 Hz to 210.7 Hz, including all of
the standard EIA frequencies, may be programmed.
Different encode/decode, encode only, and
with/without Channel Guard frequencies are also
program m ab le int o the ra di o.
• Programmable Multi-Code Digital Channel Guard
(CDCSS) Encode/Decode -- Similar capability as with
T one Channel Guard is provi de d.
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