BEI Electronics LLC 7EPTX-AM5E User Manual

2-1

WARNING:  DISCONNECT POWER PRIOR TO SERVICING

SECTION II

POWER SUPPLY CIRCUIT BOARD MAINTENANCE

2-1.

INTRODUCTION.

2-2.

This section provides maintenance information for the AM-2.5E/AM-5E transmitter

power supply circuit board assembly.

2-3.

SAFETY CONSIDERATIONS.

WARNING

WARNING
WARNING

WARNING

THE TRANSMITTER CONTAINS MULTIPLE CIRCUIT

GROUNDS WITH HIGH AC AND DC POTENTIALS

WITH RESPECT TO THE CABINET WHICH IS AT 

EARTH POTENTIAL.   DO NOT ENERGIZE THE

TRANSMITTER WITH TEST EQUIPMENT CON

NECTED TO THE TRANSMITTER OUTPUT 

NETWORK, RF POWER MODULE, RF COMBINER, OR

POWER SUPPLY COMPONENTS.

2-4.

The AM-2.5E/AM-5E transmitters contain high voltages and currents.  If safety

precautions are not practiced, contact with the high voltages and currents could cause

serious injury or death.  The transmitter is equipped with many built-in safety features,

however good judgement, care, and common sense must be practiced to prevent accidents.

2-5.

In addition to high voltages and currents, the transmitters contain multiple circuit

grounds with high ac and dc potentials with respect to the cabinet which is at earth

potential.  The potentials could cause serious injury or death if maintenance personnel

simultaneously touch a circuit ground and the cabinet.  As a result, operation of the

transmitter with test equipment connected to transmitter output network, RF power

module, RF combiner, or power supply components is extremely dangerous and must not

be attempted.  Therefore, never energize the transmitter with test equipment connected

to the transmitter output network, RF power module, RF combiner, or power supply

components.  Test equipment may be connected to the ECU circuit boards from the front 

of the transmitter using the supplied extender circuit board with power energized.  The

maintenance procedures presented in this section should be performed only by trained 

and experienced maintenance personnel.

2-6.

FIRST LEVEL MAINTENANCE.

2-7.

First level maintenance consists of precautionary procedures applied to the equipment to

prevent future failures.  The procedures are performed on a regular basis and the results

recorded in a performance log.

2-8.

CLEANING AND INSPECTION.