Antenna
The antenna and antenna contact should be kept clean
and free from dirt or corrosion. If the antenna or contact
should become dirty or corroded, loss of radiation and a
weak signal will result.
Mechanical Inspection
Since portable radio units are subject to shock and vibra-
tion, check, for loose plugs, nuts, screws and other parts to
make sure that nothing is working loose.
Alignment
The transmit and receive circuit meter readings should be
checked periodically and the alignment "touched up" when
necessary. Refer to the applicable alignment procedure and
troubleshooting sheet (found in the Service Section) for typi-
cal voltage readings.
Frequency Check
Check transmit frequency and deviation. Normally, these
checks are made when the unit is first put into operation.
They should be repeated after the first month of operation,
then again one time each year.
DISASSEMBLY
Procedures to access the Radio Board Assy (transmit, re-
ceive, and synthesizer circuits) or Control Board Assy for
servicing are explained in the following paragraphs.
•
TORX screwdriver (T-8) . . . . . . . . . . . . . . 1
•
Screwdriver (M2) . . . . . . . . . . . . . . . . . . 1
•
Pencil type soldering iron (25-40 watts)
with a fine tip. . . . . . . . . . . . . . . . . . . . . 1
REPLACEMENT
The major components of the M-RK Personal Radio are
the PA, LPF/DC./T/R SW, VCO (Voltage-Controlled Oscilla-
tor), and the VCTCXO (Reference Oscillator). These are
very reliable devices and will not normally need to be re-
placed. Before replacing any of these modules, always check
out the associated circuitry carefully.
To remove any of these major components, refer to the
applicated replacement procedure found in the Service Sec-
tion.
TROUBLESHOOTING PROCEDURE
Maintenance of the M-RK Personal Radio is facilitated
by using the Troubleshooting Procedures and service tech-
niques unique to this radio. The Troubleshooting procedures
are designed to quickly locate the defective component or
circuit. These procedures are found in the Service Section.
WEATHERPROOF INTEGRITY
The M-RK radio is designed to meet MIL-810-D specifi-
cation for Blowing Rain. All access to the M-RK radio are
protected from water entry by suitable gaskets and seals.
However, degradation due to use or disassembly during re-
pairs, may affect the integrity of the seals as provided by fac-
tory assembly. A maintenance procedure is provided in the
Service Section to assure that the radio housing will continue
to meet the weatherproof features as designed.
Printed in U.S.A.
Always remove the battery pack before removing
any component board to avoid blowing the fuse.
CAUTION
Ericsson Inc.
Private Radio Systems
Mountain View Road
Lynchburg,Virginia 24502
1-800-528-7711 (Outside USA, 804-528-7711)
LBI-38735
