Memorex RX 1 Smart Manual de Instalação descarregar pdf (Página 189)

188 | Simrad MX500

Troubleshooting Guide

The MX500 is virtually maintenance free. There are, how-

ever, a few important points to note.

Please check your installation carefully before return-

ing the MX500 to the dealer or factory for service. A few

troubleshooting tips follow.

The MX500 performs a variety of self tests during normal

operation. If a function fails the self test, the navigator

will display an Internal Error message every one minute.

Problem Diagnosis

No response:

(Black LCD display

and no trafc

light)

No external power supply

Check supply voltage

Check for reverse polarity

Check wire installation

Check if external fuse is blown

No keyboard re-

sponse or partial

keyboard response

Corrupted memory

Faulty keyboard

Faulty processor

Return the unit for repair

Battery low alarm External battery low.

Check power supply voltage and instal-

lation

No position up-

date; won’t track

satellites (Red

trafc light blink-

ing for more than

10 minutes)

Jamming by other on- board or adjacent

transmitters.

Faulty antenna or antenna cable.

Relocate GPS antenna.

Connect the MX421 power directly to the

external 12 VDC supply.

Replace antenna.

Return the unit for repair.

No position up-

date; tracking sat-

ellites (Red trafc

light solid all the

time)

DGPS mode set to DGPS Only and no

corrections are being received.

GPS satellite signals weak (satellites

dropping in and out).

Check maximum cable length restrictions

and cable condition (for weak satellite

signal condition).

Return the unit for repair.

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