Broadcast Electronics Marti Electronics ME-40, Manual

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©2011 Broadcast Electronics
5 MAINTENANCE
This section provides general maintenance information, electrical adjustment procedures, and troubleshooting
information for the ME-40 FM Exciter
5.1 SAFETY CONSIDERATIONS
WARNING
THE EXCITER CONTAINS GUARDS FOR HAZARDOUS VOLTAGES PRESENT AT THE AC
LINE SELECTOR AND HIGH CURRENTS ON THE TERMINALS OF THE POWER SUPPLY
FILTER CAPACITOR AND POWER TRANSISTORS MOUNTED ON THE RF AMPLIFIER
HEAT SINK ASSEMBLY. NEVER OPERATE THE EXCITER WITHOUT THE GUARDS. USE
THE INSULATED TUNING TOOL PROVIDED FOR ANY ADJUSTMENTS AND DO NOT
TOUCH ANY COMPONENT WITHIN THE EXCITER WHEN POWER IS ENERGIZED.
WARNING
Low voltages are used throughout the exciter circuitry; however, maintenance with power energized is
always considered hazardous and caution should be observed. It is possible to receive minor RF burns from
the high impedance points of the RF power amplifier with the exciter top panel removed
WARNING
ENSURE ALL PRIMARY POWER IS DISCONNECTED FROM THE EXCITER BEFORE
ATTEMPTING EQUIPMENT MAINTENANCE.
WARNING
5.2 FIRST LEVEL MAINTENANCE
First level maintenance consists of precautionary procedures applied to equipment to prevent future failures.
These procedures are performed on a regular basis and the results recorded in a performance log.
Periodically, the exciter chassis and fan filter should be cleaned of accumulated dust using a brush and
vacuum cleaner. Check for overheated components, tighten loose hardware, and lubricate mechanical
surfaces (such as the slide rails) as required. Check performance levels by utilizing the multimeter functions
and status indicators provided.
5.3 SECOND LEVEL MAINTENANCE
Second level maintenance consists of procedures required to restore the ME-40 Exciter to operation after a
fault has occurred.
The maintenance philosophy of the ME-40 FM Exciter consists of problem isolation to a specific assembly.
Subsequent troubleshooting is provided by each applicable assembly publication in Part II of this manual to
isolate specific components. If desired, the entire assembly may be returned to Marti Electronics for repair of
replacement.