RF POWER MODULE TROUBLE SHOOTING

PAKISTAN BROADCASTING CORPORATION Forums High Power Transmitters Islamabad HPT-2 RF POWER MODULE TROUBLE SHOOTING

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    Asad Javed
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    RF POWER MODULE TROUBLE
    SHOOTING: Refer to trouble shooting information
    in the power module’s documentation.

    Caustion; RF power modules contain solid state devices that
    may be damaged if they are subjected to excessive
    heat or high voltage transients. Every effort must be
    taken to ensure circuits are not overdriven and they
    are not disconnected from their loads while turned
    on.
    RF POWER MODULE REMOVAL:
    Remove a defective RF power module as follows:
    (a)Verify requirements of paragraph 5.4 have been
    completed and are being met.
    (b)Press POWER MODULE INHIBIT on the front
    panel of the power module.
    (c)Ensure that TEMP alarm and PWR MODULE FAIL
    alarm on the power module are both turned on.
    (d)Remove connector from J1 of the power
    module. You should hear a relay in the rear of
    the transmitter pick up (turn on).
    (e)Loosen the screw at bottom front of the power
    module (the connector must be removed from J1
    to allow access to the screw).
    (f)Remove two screws at top front of the power
    module.
    (g)Carefully pull the power module forward. Lift
    it out of the transmitter.

    NOTE
    The power modules are heavy (approximately 25kg).
    Use caution when lifting them into or out of the
    transmitter.

    If an operational RF power module is available, it
    may be installed in the transmitter while the power
    module is being serviced.

    RF POWERMODULE
    INSTALLATION: The procedure to install a power
    module in the transmitter follows:
    (a)Verify requirements of paragraph 5.4 have been
    completed and are being met.
    (b)Lift the power module into the transmitter.
    (c)Ensure the module is pushed firmly in place.
    Several alarms will turn on (PWR MODULE FAIL,
    RF FAIL and all MOD alarms).
    (d)Gently tighten the spring-loaded screw located
    at bottom front of the power module. Do not
    overtighten this screw, it needs only to be
    finger-tight.
    (e)Fasten top front of the power module to the
    transmitter with two screws. Tighten firmly.
    (f)Mate connector to J1 of the power module. You
    should hear the relay in the rear of the
    transmitter drop out (turn off).
    (g)Press RESET on front of the power module.

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