Garmin GNC 250 Manual de manutenção e reparação - Página 12

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Garmin GNC 250 Manual de manutenção e reparação

2.1

TROUBLESHOOTING EQUIPMENT REQUIRED

· 0-30 Volt DC / 6-Amp Power Supply

· Digital Multimeter

· 20 MHz Oscilloscope

· Adjust Power Supply to 14 Volts

2.2

SELF-TEST FAILURES

The GNC 250/300 monitors many of its internal functions and displays a message to alert the user

should a failure occur. The table below shows the recommended repair for each self-test failure

message.

Altitude input fail

Course input fail

(300 only)

Data card failed

Data card write fail

Fuel/Air input fail

Memory battery low

No altitude input

(300 only)

Osc needs adjustment

RAM failed

Receiver failed

Stored data lost

Configuration reset

EEPROM write fail

TROUBLESHOOTING

MESSAGE

Verify connections to altitude serializer/encoder

Verify connection between CPU Board and Comm

Receiver Board

Replace comm chassis sub-assembly

Replace CPU Board

Check ARINC 429/RS422 course input connections

Replace CPU Board

Replace NavData® card

Replace Interface Board (see Section 3.2.3)

Replace user data card

Replace Interface Board (see Section 3.2.3)

Check connections to fuel/air data system

Replace CPU Board (see Section 3.2.4)

Replace memory battery (see Section 4.1)

Verify connections to altitude serializer/encoder

Verify connections between CPU Board and Comm

Receiver Board

Replace Com/Chassis sub-assembly (see Section 3.2.2)

Replace CPU Board (see Section 3.2.4)

Replace GPS Receiver Board (see Section 3.2.5)

Replace CPU Board (see Section 3.2.4)

Replace GPS Receiver Board (see Section 3.2.5)

Replace memory battery (see Section 4.1)

Replace CPU Board (see Section 3.2.4)

SECTION 2

RECOMMENDED REPAIR*