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©2011 Broadcast Electronics
WARNING
DONOT TOUCH ANY COMPONENT WITHIN THE
EXCITER WITH POWER APPLIED.
WARNING
D. With an insulated adjustment tool, adjust R41 fully counterclockwise, then clockwise until the 100%
modulation indicator just illuminates.
E. Adjust the audio generator for 0.6V peak-to-peak (0.212V RMS). The front-panel X10 indicator will
illuminate.
WARNING
DONOT TOUCH ANY COMPONENT WITHIN THE
EXCITER WITH POWER APPLIED.
WARNING
F. With an insulated adjustment tool, adjust R28 fully counterclockwise, then clockwise until the 100%
modulation indicator just illuminates.
G. Remove all test equipment and replace the top-cover.
7.5.2
TROUBLESHOOTING.
The troubleshooting philosophy for the metering circuit board consists of isolating a problem to a specific
circuit. The problem may be further isolated by referencing the following information and Table 7-1 which
presents troubleshooting information for the metering circuit board.
WARNING
DISCONNECT PRIMARY POWER FROM THE EXCITER BEFORE
REMOVING ANY COMPONENTS.
WARNING
After the problem is isolated and power is totally deenergized, refer to the schematic diagrams and the theory
of operation to facilitate in problem resolution. The defective circuitry may be repaired locally or the circuit
board may be returned to Broadcast Electronics for repair or replacement.
Table 7-1. METERING CIRCUIT BOARD TROUBLESHOOTING
SYMPTOM
DEFECT/REMEDY
NO MODULATION AND MULTIMETER
DISPLAY
1.
Check the +15V regulator circuit U14.
2.
Check the -15V regulator circuit U15.
3.
Check the -5V regulator circuit U16.
NO MODULATION DISPLAY
1.
Check the +24V regulator circuit U22.
2.
Check integrated circuit U1C.
3.
Check integrated circuit U2 and associated
components.
4.
Check transistor Q1 and associated
CAUTION
CAUTION
INADVERTENT CONTACT BETWEEN ADJACENT
COMPONENTS AND CIRCUIT TRACES MAY DAMAGE
THE POWER SUPPLY/CONTROL BOARD.
Содержание FX-50
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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 ...
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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 ...
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Страница 81: ...69 2011 Broadcast Electronics Table 9 2 FREQUENCY SYNTHESIZER PROGRAMMING ...
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Страница 85: ...73 2011 Broadcast Electronics Figure 9 5 NO MODULATION LOCK INDICATOR ILLUMINATED ...
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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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