MD Helicopters 369-500, Maintenance Instructions Manual

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CSP-HMI-3
MD Helicopters, Inc
.
MAINTENANCE MANUAL
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97-06-00
Page 103
Revision 12
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1999 − 2016 by MD Helicopters, Inc.
Table 101. Troubleshooting ICS System (Cont)
Symptom Corrective Action Probable Cause
Cannot transmit radio signals; can
receive radio signals, and ICS
operation is normal at stations.
Defective audio circuits in vhf
COMM radio.
Repair or replace vhf COMM radio.
Defective transmit keying circuit in
ICS control unit.
Repair or replace ICS control unit.
Cannot receive radio signals; radio
transmission and ICS operation
normal at stations.
Defective audio circuits in ICS
control unit.
Repair or replace ICS control unit.
Defective receiver in associated
radio.
Repair or replace radio.
No transmitter sidetone audio at
any station during radio
transmission; otherwise, ICS, radio
transmission and radio reception
normal.
Incorrectly adjusted COMM 1 (or
COMM 2) sidetone level control
R22 (or R25) on ICS control unit.
Adjust applicable control as
necessary.
Defective sidetone audio circuits or
amplifier in ICS control unit.
Repair or replace ICS control unit.
Defective sidetone circuits in
associated vhf or hf COMM radio.
Repair or replace vhf or hf COMM
radio.
Table 102. Input and Output Test Signals − CE 500 HT − 3G ICS Control Unit
Input Output
Check
No.
Signal (Vac at
1000 Hz, rms)
J509 Pin No.
and Letter
Enable GND at
J509 Pin. No. or
Letter
Signal (Vac at
1000 Hz, rms)
J509 Pin No.
or Letter
1 8.00 +0.2
− 0.0
K to T None 6.0 to 9.0 U to V
2 8.00 +0.2
− 0.0
L to T None 6.0 to 9.0 U to V
3 8.00 +0.2
− 0.0
M to T None 6.0 to 9.0 U to V
4 8.00 +0.2
− 0.0
N to T None 6.0 to 9.0 U to V
5 8.00 +0.2
− 0.0
P to T None 6.0 to 9.0 U to V
6 1.8 +0.2
− 0.0
R to T None 6.0
±
0.5 U to V
7 1.8 +0.2
− 0.0
S to T None 6.0
±
0.5 U to V
8 0.100 +0.010
− 0.000
C to T W 0.100
±
0.010 D to T
9 0.100 +0.010
− 0.000
E to T X 0.100
±
0.010 D to T