Reception Trouble-2) There Are Many Reception Errors - Furuno NX-700B Service Manual

3. Reception trouble-2) There are many reception errors.

There are many reception errors.
Do errors occur on a specific frequency?
No
Do errors occur on a station within
a service area?
Yes
Check the RX Test.
Are the test results OK on all frequencies
of 518 kHz, 490 kHz, and 4209.5 kHz?
Yes
Failure of antenna unit NX-7H
Reference:
1. Check if reception is enabled when the antenna is switched to FAX-5 used for the FAX reciver
or MF/HF WR, where practical.
2. Reception is stopped when the rate of receiving errors exceeds 33%.
Check it in the following setting.
･Ver-02.01
[MENU] -> NAVTEX -> Mask Mode -> Manual
･Ver-01.02
[MENU] -> NAVTEX -> Receiver Mode -> Manual
To check a receiving message in real time:
[MENU] -> Service -> Rcv Monitor
1. The problem may be caused due to interference
Yes
if the status of errors changes with time or the
power ON/OFF of other device.
2. The problem may be caused due to the failure of
the RCV board.
- To set the received frequency:
No [MENU] -> NAVTEX -> Local channel
- To set the station and message type:
[MENU] -> NAVTEX -> Rcv Station & Msg
To check the currently receivable stations and message types:
[MENU] -> Initialize 1 -> Available Rcv Station List
The problem may be caused due to the failure
No
of the CPU board or RCV board.
If the test results are OK on any of frequencies,
the problem may be caused due to the failure of
the RCV board.
The Rx Test is executed in the following setting:
[MENU] -> Service -> Test
Note:
To set the received frequency;
[MENU] -> NAVTEX -> Local channel
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7.7 Troubleshooting