Appendix B - Troubleshooting - Navman VHF 7000 Owner's Manual

1. The transceiver will not power up.
A fuse may have blown OR there is no voltage getting to the transceiver.
a) Check the power cable for cuts, breaks, or squashed sections.
b) Replace the fuse (2 spare fuses are supplied).
c) Check the battery voltage. This must be greater than 10.5V.
2. The transceiver blows the fuse when the power is switched on.
The power wires may have been reversed.
a) Check that the red wire is connected to the positive battery terminal, and
the black wire is connected to the negative battery terminal.
3. The speaker makes popping or whining noises when the engine is
running.
Electrical noise may be interfering with the transceiver.
a) Re-route the power cables away from the engine.
b) Add a noise suppressor to the power cable.
c) Use resistive spark plug wires and/or use an alternator whine filter.
4. No sound from the external speaker.
a) Check that the external speaker cable is physically connected.
b) Check the polarity of the external speaker cable.
5. Transmissions are always on low power, even when high (HI) power is
selected.
The antenna may be faulty.
a) Test the transceiver with a different antenna.
b) Have the antenna checked out.
6. Battery symbol is displayed.
The power supply is too low or too high.
a) Check the battery voltage. This should be between 10.5V and
b) Check the generator.
7. No position information is displayed.
The GPS cable may faulty or the GPS setting may be incorrect.
a) Check that the GPS cable is physically connected.
b) Check the polarity of the GPS cable.
c) Check the baud rate setting of the GPS if applicable. The baud rate setting
should be 4800 and parity should be set to NONE.

Appendix B - Troubleshooting

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