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©2011 Broadcast Electronics
In addition, +5 volts is applied to a filter circuit consisting of capacitors C12, C13, and inductor L1. The output
illuminates indicator DS1 and provides a +5V/A operating potential.
9.6
MAINTENANCE
This section provides maintenance information, electrical adjustment procedures, and troubleshooting
information for the exciter AFC/PLL circuit board.
9.7
ELECTRICAL ADJUSTMENTS.
Figure 9-2 presents the AFC/PLL circuit board controls and indicators with the cover removed. The following
electrical adjustment procedures do not require the cover to be removed.
REQUIRED EQUIPMENT. The following tools and equipment are required for electrical adjustment procedures.
A. Insulated adjustment tool, shipped with the exciter (P/N 407-0038).
B. Digital voltmeter, Fluke 75 or equivalent.
C. Low distortion audio generator and distortion analyzer, Sound Technology 1710A or equivalent.
D. Calibrated oscilloscope.
E. High linearity FM demodulator, Belar FMM-2 or equivalent.
F. 20 dB power attenuator, Bird 8343-200 or equivalent.
G. Calibrated frequency counter, HP-5315B or equivalent.
9.7.1
BAL MONO (R91).
The BAL MONO level control on the AFC/PLL circuit board adjusts the output level of the balanced monophonic
amplifier circuit. BAL MONO control R91 is adjusted as follows.
Procedure. To adjust BAL MONO control R91, refer to Figure 9-2 as required and proceed as follows:
WARNING
DISCONNECT EXCITER PRIMARY POWER BEFORE
PROCEEDING.
WARNING
A. Disconnect the exciter primary power.
B. Remove the top-cover and connect an audio generator to the AUDIO INPUT terminals on rear-panel
barrier strip TB1.
C. Connect a digital voltmeter to the front-panel COMPOSITE OUT receptacle.
Содержание FX-50
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