1. Place the ignition switch in RUN.
2. Compare the radio's reception of a weak station to that of a known good radio.
3. Ensure that both vehicles are positioned equivalently in order to equalize the possible differences in the noise or the reception levels.
4. After the comparisons are made, turn OFF the radios.

Is the radio radio's reception equivalent to the known good radio with no significant difference in noise levels?

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Go to Radio/Audio System Check

Go to Step 2

1. Disconnect the radio antenna lead-in wire at the radio.
2. Connect a pre-zeroed ohmmeter J 39200 between the coax (outer) conductor of the radio antenna lead-in wire and ground.

Is the antenna resistance to ground equal to or greater than the specified value?

0.15 ohms

Go to Step 3

Go to Step 4

Replace the antenna coax cable.

Refer to Radio Antenna Cable Extension Cable Replacement .

Is the radio sound quality good?

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Go to Radio/Audio System Check

Go to Step 5

1. Wiggle the antenna mast and the lead-in wire.
2. Monitor the J 39200 for intermittent opens.

Does the power antenna resistance to ground remain less than the specified value?

0.15 ohms

Go to Step 5

Go to Step 6

Connect a pre-zeroed ohmmeter J 39200 between the signal (inner) conductor of the radio antenna lead-in wire and the antenna mast.

Is the antenna lead-in wire signal resistance less than the specified value?

2 ohms (RG-58) or 3.5 ohms (RG-62 or RG-62M)

Go to Step 7

Go to Step 8

Replace the antenna coax cable.

Refer to Radio Antenna Cable Extension Cable Replacement .

Is the radio sound quality good?

--

Go to Radio/Audio System Check

Go to Step 5

1. Wiggle the antenna mast and the lead-in wire.
2. Monitor the ohmmeter J 39200 for intermittent opens.

Does the antenna lead-in wire signal resistance remain less than the specified value?

2 ohms (RG-58) or 3.5 ohms (RG-62 or RG-62M)

Go to Step 9

Go to Step 10

Replace the antenna coax cable.

Refer to Radio Antenna Cable Extension Cable Replacement .

Is the radio sound quality good?

--

Go to Radio/Audio System Check

Go to Step 9

1. Reconnect the antenna lead-in wire to the radio.
2. Place the ignition switch in RUN.
3. Play the radio.

Is the reception problem resolved?

--

Go to Radio/Audio System Check

Go to Step 11

Replace the antenna coax cable.

Refer to Radio Antenna Cable Extension Cable Replacement .

Is the radio sound quality good?

--

Go to Radio/Audio System Check

Go to Step 9

1. Remove the radio. Refer to Radio Replacement .
2. Send the radio in for repair.

Is the repair complete?

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Go to Radio/Audio System Check

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