Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
1 | Did you review the radio/audio system operation and perform the necessary inspections? | -- | Go to Step 2 | Go to Symptoms |
2 | Verify that the amplifier is inoperative. Does the amplifier operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 |
3 | Inspect the AMPF fuse. Is the fuse open? | -- | Go to Step 4 | Go to Step 5 |
4 | Repair the short to ground in CKT 1340 (ORN), or amplifier. Refer to Circuit Testing and Wiring Repairs in Wiring Systems, or Radio Speaker Amplifier Replacement if circuit ok. Is the repair complete? | -- | Go to Step 16 | -- |
5 | Connect a test lamp from Amplifier connector C2, cavity H to ground. Did the test lamp light? | -- | Go to Step 7 | Go to Step 6 |
6 | Repair the open or high resistance in CKT 1340 (ORN). Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 16 | -- |
7 | Connect a test lamp from Amplifier connector C2, cavity A, to cavity H. Did the test lamp light? | -- | Go to Step 9 | Go to Step 8 |
8 | Repair the open or high resistance in CKT 1050 (BLK) or ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems. Is the repair complete? | -- | Go to Step 16 | -- |
9 |
Is voltage present in CKT 145 (DK GRN)? | 9-16 V | Go to Step 11 | Go to Step 10 |
10 | Repair the open or high resistance in CKT 145 (DK GRN). Refer to Circuit Testing and Wiring Repairs in Wiring Systems. If ok, service the radio. Refer to Radio Replacement Is the repair complete? | -- | Go to Step 16 | -- |
11 |
Important: The audio signal can be identified as a fluctuating AC voltage. Measure from the channel input cavity to the channel common ground cavity.
Is the audio signal present at one input? | 0-1.5 V AC | Go to Step 14 | Go to Step 12 |
12 |
Is the audio signal present at all outputs? | 0-1.5 V AC | Go to Step 13 | Go to Step 15 |
13 | Repair the harness. Is the repair complete? | -- | Go to Step 16 | -- |
14 |
Is service of the amplifier complete? | -- | Go to Step 16 | -- |
15 | Service the radio. Refer to Radio Replacement Is the repair complete? | -- | Go to Step 16 | -- |
16 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 |
