CSP-HMI-3 MD Helicopters, Inc.
MAINTENANCE MANUAL
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Copyright © 1999−2016 by MD Helicopters, Inc.
Table 102. Input and Output Test Signals − CE 500 HT−3G ICS Control Unit (Cont)
OutputInput
Check
No.
J509 Pin No.
or Letter
Signal (Vac at
1000 Hz, rms)
Enable GND at
J509 Pin. No. or
Letter
J509 Pin No.
and Letter
Signal (Vac at
1000 Hz, rms)
10 0.100 +0.010
−0.000
F to T aa 6.0 ±0.5 U to V
11 0.100 +0.010
−0.000
H to T bb 6.0 ±0.5 U to V
12 0.100 +0.010
−0.000
J to T cc 6.0 ± 0.5 U to V
13 0.100 +0.010
−0.000
C to T Y 6.0 ± 0.5 U to V
14 0.100 +0.010
−0.000
E to T Z 6.0 ± 0.5 U to V
15 Use ohmmeter. W to dd None Check diode
continuity.
None
16 Use ohmmeter. X to dd None Check diode
continuity.
None
NOTE:
(1) For checks No. J thru R: Input signals are to be applied thru a series−connected 10 mfd capacitor. With
input signal applied, enable ground (electrical connection between pin B of J509 to connector pin listed) is
to be applied to obtain output signal. Pin T is audio common connection.
(2) For diode continuity checks No. S and T: With ohmmeter positive lead connected to pin DD and negative
lead to other pin listed, ohmmeter should indicate low forward resistance. With ohmmeter leads reversed,
ohmmeter should indicate high back resistance.
(3) If necessary, adjust controls on the unit to obtain the listed outputs. (Ref. Integrated Interphone
Communication System Testing and Adjustments).
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