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BEI Electronics LLC 7EPTX-AM5E Manual De Usuario

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WARNING:  DISCONNECT POWER PRIOR TO SERVICING
2-5
2-36.
Procedure.  To adjust NEG LIMIT control R76, proceed as follows:
WARNING
WARNING
DISCONNECT ALL TRANSMITTER PRIMARY POWER
BEFORE PROCEEDING.
2-37.
Disconnect all transmitter primary power.
2-38.
Connect the audio generator to the TB2 LEFT INPUT and RIGHT INPUT audio
terminals on the ECU rear-panel.
2-39.
Adjust NEG LIMIT control R76 on the exciter circuit board fully counterclockwise.
2-40.
Adjust the audio generator for a L=R 1 kHz output at +10 dBm.
2-41.
Adjust the AM stereo modulation monitor to indicate positive L+R modulation.
2-42.
Energize the transmitter primary power and operate the transmitter.
2-43.
Observe the modulation monitor and ensure the monitor indicates 100% positive L+R
modulation.  If the monitor does not indicate 100% L+R modulation, adjust the audio
generator level slightly for a +100% L+R modulation indication on the monitor.
2-44.
Adjust the AM stereo modulation monitor to indicate negative L+R modulation.
2-45.
Adjust NEG LIMIT control R76 on the exciter circuit board until the AM stereo
Modulation monitor indicates -95% L+R modulation.
WARNING
WARNING
DISCONNECT ALL TRANSMITTER PRIMARY POWER
BEFORE PROCEEDING.
2-46.
Disconnect all transmitter primary power.
2-47.
Remove all test equipment.
2-48.
FREQUENCY CALIBRATION CONTROL. 
 Frequency calibration control C108 calibrates
the exciter frequency synthesizer.  The frequency calibration control is adjusted in the
following procedure.
2-49.
Procedure.  To adjust frequency calibration control C108, proceed as follows:
WARNING
WARNING
DISCONNECT ALL TRANSMITTER PRIMARY POWER
BEFORE PROCEEDING.
2-50.
Disconnect all transmitter primary power.
2-51.
Remove the exciter circuit board and install the ECU extender circuit board in the exciter
circuit board location.
2-52.
Install the exciter circuit board on the extender circuit board.
2-53.
Connect a frequency counter to test point TP15 on the exciter circuit board.
2-54.
Energize the transmitter primary power and operate the transmitter.
2-55.
Adjust frequency calibration control C108 on the exciter circuit board for the carrier
frequency.