FQ7-2019-007 : No Heading Display
Model - SC-33/IF-NMEASC
Written by Paul Lawson
Updated at October 8th, 2024
Technical Information:
When symptoms occurs / At installation
Product Name:
SC-33/IF-NMEASC
FQ7-2019-007
Brief Description :
[Symptoms]
For ships using the SC-33 via the IF-NMEASC, the heading is not displayed, or the heading display of the IF-NMEASC shows [--] or counts up from 000.0 to 999.9
[Cause]
When the IF-NMEASC is connected to the SC-33, voltage supplied to the SC-33 may be unstable; and thus the SC-33 may not operate normally and may interrupt heading output.
Note: Because the consumption current variation of the SC-30 is smaller then that of the SC-33, the SC-30 connected to the IF-NMEASC does not cause this problem.
[Remedies]
Temporary Remedy
-For the power supply line of the SC-33, change the J7 #1 and #2 to TB1 #1 and #2 of the IF-NMEASC.
-Add a protective fuse (1 to 2 A) before of after TB#1.
Permanent Remedy
The power supply circuit of the IF-NMEASC is going to be changed. (Scheduled in April 2020)
Details will be notified in FURUNO information.
Tech Note : fq7201900700.pdf
