MD Helicopters 369-500, Инструкция по техническому обслуживанию

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Table 101. Troubleshooting ICS System (Cont)
Symptom Corrective Action Probable Cause
NOTE:
Before troubleshooting other avionics installations for audio troubles, or other functions that are depen-
dent upon intercom and vhf radio equipment, be sure to first check that intercom and vhf radio equipment
functions correctly. Troubles that may occur in intercom and vhf radio control equipment that affect radio oper-
ation are listed in the following troubleshooting procedures for intercom and vhf radio equipment. Also,
troubles that may occur in equipment or other installations that affect intercom and radio operation are listed
in these procedures.
INTERCOM AND RADIO CONTROL EQUIPMENT
NOTE:
Station in following procedures refers to radio/intercom station in the helicopter. A separate table (Ref.
Table 202) provides input and data for the ICS control unit, for troubleshooting the unit.
PA, SSB or RADIO circuit breaker
trips.
Overload or short circuit in ICS
control unit.
Repair or replace ICS control unit.
Radio and ICS modes of operation
are inoperative at all stations.
Defective ICS control unit. Repair or replace ICS control unit.
Cannot transmit from one station to
any other station; normal ICS and
radio operation from other stations.
Defective microphone in
headset − microphone.
Repair or replace headset − micro-
phone.
Defective associated RADIO − ICS
switch.
Repair or replace switch.
Cannot receive interphone and
receiver audio at one station;
normal ICS and radio operation at
other stations.
Defective headset in headset − mi-
crophone.
Repair or replace headset − micro-
phone.
Cannot transmit and receive audio
between any stations for ICS
operation; radio transmission and
reception normal at all stations.
Defective interphone keying circuit
in ICS control unit.
Repair or replace ICS control unit.
Defective microphone audio circuit
or amplifier in ICS control unit.
Repair or replace ICS control unit.
Defective audio circuits in vhf
COMM radio associated with ICS
control unit.
Repair or replace vhf COMM radio.
Cannot transmit radio signals, and
cannot transmit and receive audio
between any stations; radio
reception normal at all stations.
Incorrectly adjusted ICS control R8
on ICS control unit.
Adjust control as necessary.
Defective microphone filter. Replace microphone filter.
Defective microphone audio circuit
or amplifier in ICS control unit.
Repair or replace ICS control unit.
Cannot transmit and receive audio
between any stations, and cannot
receive radio signals; radio
transmission normal at all stations.
Defective phone audio amplifier
circuits in ICS control unit.
Repair or replace ICS control unit.
Defective audio circuits in vhf
COMM radio.
Repair or replace vhf COMM radio.
Cannot transmit or receive radio
signals; ICS operation normal
between stations.
Defective radio equipment in
associated radio installation.
Repair or replace defective radio
equipment.
Defective ICS control unit. Repair or replace ICS control unit.