Nautel V10 User's Installation And Operation Manual

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Nautel V10 User's Installation And Operation Manual Manual pdf 129 page image

V10/V7.5/V5/V3.5 Installation and Operation Manual Page 5-25Section 5 System Level Troubleshooting Issue 3.5NOTECooling fans for RF power modules arelocated at the rear of the transmitter behindeach applicable RF power module. The RFoutput cables may have to be movedslightly (but not disconnected) to gainaccess to the associated cooling fan’smating connector.(a) Disconnect the defective fan’s plug(P1) from the associated interconnectPWB’s J4 connector (see fans below).Transmitter FansV10 B1 (A) – B4 (D), B5 (IPA A),B6 (E) – B9 (H); B10* (IPA B)V7.5 B1 (A) – B3 (C), B5 (IPA A),B6 (E) – B8 (G); B10* (IPA B)V5 B1 (A) – B4 (D), B5 (IPA A)V3.5 B1 (A) – B3 (C), B5 (IPA A)* B10 is installed when IPA module B is used(b) Remove the two securing screws forthe fan (Phillips-head). Retainhardware and finger-guard.(c) Install replacement fan and finger-guard using hardware from step (b).NOTEEnsure that the fan is installed such thatthe direction of airflow is drawing from therear of the transmitter cabinet andexhausting to the front. Also ensure thatthe finger-guard is installed properly.(d) Reconnect plug removed in step (a).WARNINGTo prevent personal injury, ensure thatthe fan’s plug is connected last.5.6.2 Combiner FansIf replacing a combiner fan, perform thefollowing steps:NOTEThe top combiner fan (B11) is attached toreject load assembly A39. The bottomcombiner fan (B12) is attached to rejectload assembly A40.(a) Disconnect the defective fan’s plug(P1) [fans are B11 (top) and B12(bottom)] from the associatedconnector [P85 (B11) or P86 (B12)].• Remove the two securing screws forthe fan (Phillips-head). Retainhardware and finger-guard.• Install replacement fan and finger-guard using hardware from step (b).NOTEEnsure that the fan is installed such thatthe direction of airflow is drawing from therear of the transmitter cabinet andexhausting to the front. Also ensure thatthe finger-guard is installed properly.(b) Reconnect plug removed in step (a).WARNINGTo prevent possible personal injury,ensure that the fan’s plug is connectedlast.5.7 OPERATION WITH DEFECTIVEOR MISSING POWER MODULE(S)It is permissible to operate the transmitterwith multiple defective or missing RF powermodule(s). Refer to paragraph 5.7.1 todetermine the approximate effects on RFoutput and reject load power levels forgiven PA failures or module removal.CAUTIONDo not attempt to compensate for powerreduction caused by an RF power modulefailure by adjusting RF power level.• If an RF power module has one ormore defective PAs, as indicated bythe GUI’s Module Status screen (andsuspect RF power module’s front PAFail LEDs), but is still contributing to thetransmitter's RF output, it may be lefton. The transmitter will take necessaryprecautions to reduce the stress oncomponents due to the failure, i.e.,power reduction.