Circuit/System Testing

Without Amplifier

1. Center the balance and fade adjustment on the radio.
   • If adjustment of the fade and balance eliminates the concern, review the operation of the radio with the customer.
2. Connect a DMM between the suspect low level audio signal circuits. Turn ON the radio and record the AC voltage of the suspect speaker channel. Compare and verify the AC voltage output of the suspect low level audio signal is the same as the opposite low level channel.
   • If the suspect speaker channel low level audio signal AC voltage is lower than other channels, replace the radio.

• If the recorded AC voltage is the same level as other speaker low level audio signal AC outputs, replace the suspect speaker.

With Amplifier

1. Center the balance and fade adjustment on the radio.
   • If adjustment of the fade and balance eliminates the concern, review the operation of the radio with the customer.
2. Disconnect the suspect harness connector at the amplifier. Connect a DMM between the suspect low level audio signal circuits. Turn ON the radio and record the AC voltage of the suspect speaker channel. Compare and verify the AC voltage output of the suspect low level audio signal is the same as opposite low level channel.
   • If the suspect speaker channel low level audio signal AC voltage is lower than other channels, replace the radio.
3. Reconnect all amplifier harness connectors. Disconnect individual speaker harness connectors and measure with a DMM between the suspect speaker signal circuits. With Turn ON the radio and record the AC voltage of the suspect speaker channel. Compare and verify the AC voltage output of the suspect speaker signal is the same as the opposite speaker signal channel.
   • If the suspect channel speaker signal AC voltage is lower than other channels, replace the amplifier.
   • If the recorded AC voltage is the same level as other speaker signal AC outputs, replace the suspect speaker.