All Speakers Inoperative

IMPORTANT: The following information lists the most probable cause of the concern to the least probable cause followed by the appropriate test for that condition. If the list leads to the replacement of a component, always inspect for a poor connection before proceeding with the replacement. Refer to Testing for Intermittent and Poor Connections and to Connector Repairs in Diagnostic Aids.

With RPO UQ3
1. Speaker output shorted. Test all speaker outputs for a short to ground and a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Diagnostic Aids.
2. Defective radio - Replace radio. Refer to Radio Replacement.

With RPO U85
1. Battery Positive Voltage circuit to the amplifier open. Test the Battery Positive Voltage circuit to the amplifier form an open. Refer to Circuit Testing and to Wiring Repairs in Diagnostic Aids.
2. Ground circuit to the amplifier open. Test the ground circuit to the amplifier for an open. Refer to Circuit Testing and to Wiring Repairs in Diagnostic Aids.
3. Low level audio signal circuit shorted. Test all low level audio signal outputs for a short to ground and a short to voltage. Refer to Circuit Testing and to Wiring Repairs in Diagnostic Aids.
4. No audio output from the radio. Test for any AC voltage between the appropriate low level audio signal circuits and the amplifier connector, disconnected with the radio volume adjusted to 50 percent. If AC voltage is present, replace the amplifier. Refer to Amplifier Replacement. If no AC voltage is present, replace the radio. Refer to Radio Replacement.