Preamplifier · Sansui · AU-D7

Diagnosis: One Channel Dead

One side has no sound or substantially less sound than the other.

Safe first checks

  1. Swap the left and right speakers at the receiver end.
  2. If the problem moves, the speaker or its cable is the likely cause.
  3. If the problem stays on the same receiver channel, test another input source.
  4. With the volume low, gently operate the balance control and input selector; do not spray cleaner into the unit while powered.

Next step

Record whether the fault affects every input and whether headphones have the same missing channel.