ComNav P4 Installation and Operation Appendices
Document PN 29010100 V1r0 - 178 -
Appendix 3
Diagnostic LEDs
The Signal Processor Unit is equipped with a number of Light-Emitting Diode (LED) lamps
that can assist in trouble-shooting should a problem arise with the autopilot system. To
observe the LEDs, remove the metal cover on the Diagnostic section.
On whenever there is an alarm condition on the SPU. Lights in conjunction
with the audible alarm.
A general indication of the Battery Power supplied to the SPU. Should be
on whenever the autopilot is turned on.
An indication of the power available for the output Drive. Drive Power
should be brightly lit whenever the autopilot is on. If it is off, check fuse F2.
VCC is the voltage supplying the logic circuits on the SPU. The voltage is
nominally 5.25 VDC, and can be measured at testpoint TP3 with respect to
ground (GND).
This indicator will be on whenever the Switched B+ output is turned on.
This indicator will be on whenever the Switched Ground output is turned on.
For systems that utilize Solenoid steering valves, this LED will be lit
whenever the solenoid is activated. For Reversing Motor systems, this
LED will be shut off whenever the motor is activated in one direction (which
direction depends on how the reversing motor was plumbed in and wired.
For systems that utilize Solenoid steering valves, this LED will be lit
whenever the solenoid is activated. For Reversing Motor systems, this LED
will be shut off whenever the motor is activated in the opposite direction to
the M1 output.
This LED will be lit whenever the autopilot receives serial data on the NAV1
input. Note that this indicator only shows that data was received. It does
not mean that the data received is valid. Typically, this LED will flash at a
rate of about once per second for regular data from a GPS or Chartplotter;
it will flash at a rate of about 10 times per second when connected to a
heading source such as an NMEA compass. If the LED does not flash and
you are sure the sending device is sending data, try reversing the wires
from the device connected to J9
– NAV I/O.
This LED operates identically to the NMEA 0183 IN #1, but shows the
reception of data for the NAV2 input.
This LED flashes whenever NMEA 0183 serial data is sent out of the SPU.
During normal operation, this LED will flash at a rate of about ten times per
second.
This LED is reserved for possible future use.
This LED is reserved for possible future use.
Table 13 – Diagnostic LEDs
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