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©2011 Broadcast Electronics
5
MAINTENANCE
This section provides general maintenance information, electrical adjustment procedures, and troubleshooting
information for the FX-50/E FM Exciters.
5.1
SAFETY CONSIDERATIONS.
WARNING
THE EXCITER CONTAINS GUARDS FOR HAZARDOUS
VOLTAGES PRESENT AT THE AC LINE SELECTOR AND
WARNING
HIGH CURRENTS ON THE TERMINALS OF THE POWER
SUPPLY FILTER CAPACITOR AND POWER
TRANSISTERS MOUNTED ON THE RF AMPLIFIER HEAT
SINK ASSEMBLY.
WARNING
NEVER OPERATE THE EXCITER WITHOUT THE
GUARDS.
WARNING
WARNING
USE THE INSULATED TUNING TOOL PROVIDED FOR
ANY ADJSUTMENTS AND DO NOT TOUCH ANY
WARNING
COMPONENT WITHIN THE EXCITER WHEN POWER IS
ENERGIZED.
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
WARNING
ENSURE ALL PRIMARY POWER IS DISCONNECTED FROM
THE EXCITER BEFORE ATTEMPTING EQUIPMENT
MAINTENANCE
5.2
FIRST LEVEL MAINTENANCE.
First level maintenance consists of precautionary procedures applied to equipment to pre vent 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 FX-50/E to operation after a fault has
occurred.
The maintenance philosophy of the FX-50/E FM Exciters 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 Broadcast Electronics. for repair
or replacement.
Содержание FX-50
Страница 12: ...x 2011 Broadcast Electronics This page intentionally left blank ...
Страница 20: ...8 2011 Broadcast Electronics Figure 2 1 FX 50 E REAR PANEL CONNECTIONS SHEET 1 OR 2 ...
Страница 21: ...9 2011 Broadcast Electronics Figure 2 1 FX 50 E REAR PANEL CONNECTIONS SHEET 2 OR 2 ...
Страница 32: ...20 2011 Broadcast Electronics Figure 3 1 FX 50 E CONTROLS AND INDICATORS ...
Страница 35: ...23 2011 Broadcast Electronics Figure 4 1 FX 50 E OVERALL SIMPLIFIED SCHEMATIC ...
Страница 40: ...28 2011 Broadcast Electronics Figure 5 1 FX 50 E ASSEMBLY ...
Страница 46: ...34 2011 Broadcast Electronics Figure 6 1 CONTROL CIRCUITRY SIMPLIFIED SCHEMATIC ...
Страница 49: ...37 2011 Broadcast Electronics Figure 6 2 POWER SUPPLY SIMPLIFIED SCHEMATIC DIAGRAM ...
Страница 53: ...41 2011 Broadcast Electronics Figure 6 4 PARALLEL LOAD CONNECTION ...
Страница 56: ...44 2011 Broadcast Electronics Figure 6 5 NO PA VOLTAGE TO THE RF AMPLIFIER ...
Страница 58: ...46 2011 Broadcast Electronics Figure 7 1 METERING CIRCUIT REMOVAL AND INSTALLATION DIAGRAM ...
Страница 60: ...48 2011 Broadcast Electronics Figure 7 2 METTERING BOARD SIMPLIFIED SCHEMATIC ...
Страница 68: ...56 2011 Broadcast Electronics Figure 8 1 MODULATED OSCILLATOR SIMPLIFIED SCHEMATIC DIAGRAM ...
Страница 74: ...62 2011 Broadcast Electronics Figure 9 1 AFC PLL CIRCUIT BOARD SIMPLIFIED SCHEMATIC ...
Страница 81: ...69 2011 Broadcast Electronics Table 9 2 FREQUENCY SYNTHESIZER PROGRAMMING ...
Страница 84: ...72 2011 Broadcast Electronics Figure 9 4 NO RF OUTPUT LOCK IS EXTINGUISHED ...
Страница 85: ...73 2011 Broadcast Electronics Figure 9 5 NO MODULATION LOCK INDICATOR ILLUMINATED ...
Страница 89: ...77 2011 Broadcast Electronics Figure 10 1 RF AMPLIFIER SIMPLIFIED SCHEMATIC ...
Страница 92: ...80 2011 Broadcast Electronics Figure 10 2 RF AMPLIFIER CIRCUIT BOARD CONTROLS ...
Страница 95: ...83 2011 Broadcast Electronics Figure 10 3 RF AMPLIFIER TROUBLESHOOTING INFORMATION ...
Страница 100: ...88 2011 Broadcast Electronics Figure 11 1 SLAVE FM BOOSTER SIMPLIIFED SCHEMATIC ...
Страница 101: ...89 2011 Broadcast Electronics Figure 11 2 MASTER FM BOOSTER SIMPLIFIED SCHEMATIC ...
Страница 161: ...149 2011 Broadcast Electronics Figure 14 1 OPTIONAL LOW PASS FILTER ASSEMBLY ...
Страница 162: ...150 2011 Broadcast Electronics Figure 14 2 EXCITER FRONT RAIL MOUNTING APPLICATIONS ...
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