14-2 MTR3000 Maintenance and Disassembly/Reassembly: Preventive Maintenance
The only factory recommended liquid for cleaning the printed circuit boards and their components is
isopropyl alcohol (100% by volume).
Cleaning Internal Circuit Boards and Components
Isopropyl alcohol (100%) may be applied with a stiff, non-metallic, short-bristled brush to dislodge
embedded or caked materials located in hard-to-reach areas. The brush stroke should direct the
dislodged material out and away from the inside of the base station/repeater. Make sure that
controls or tunable components are not soaked with alcohol. Do not use high-pressure air to hasten
the drying process since this could cause the liquid to collect in unwanted places. Once the cleaning
process is complete, use a soft, absorbent, lintless cloth to dry the area. Do not brush or apply any
isopropyl alcohol to the top cover and base station/repeater enclosure.
14.3.3 Station Reference Alignment Procedure
The base station/repeater reference needs to be aligned yearly to maintain optimum functionality.
To align the base station/repeater reference:
1. Remove the front bezel of the base station/repeater.
2. Connect the External Reference to J3008M7 of the SCM. SCM accepts 5 MHz or 10 MHz
sine or square wave with 3V peak-to-peak.
3. The reference LED on the SCM will turn solid amber to indicate that the alignment is in
progress.
4. The reference LED on the SCM will turn solid green to indicate that the alignment is
completed successfully.
5. Remove the External Reference from J3008M7, and the reference LED will turn off.
6. Replace the front bezel of the base station/repeater.
Note
Internal surfaces should be cleaned only when the base station/repeater is disassembled
for service or repair.
Note
Always use a fresh supply of alcohol and a clean container to prevent contamination by
dissolved material (from previous usage).
The 800/900 MHz base station/repeater must be in a powered
state (AC/DC applied) for a minimum of 10 minutes prior to
applying an external reference for the purpose of alignment.
Failure to comply to the 10 minutes wait time will result in an
inaccurate reference frequency alignment.
W A R N I N G
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