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| Problem | Likely Cause & Solution | | :--- | :--- | | | 1. Check speaker connections (short circuit possible). 2. Press MUTING on remote. 3. Turn up MASTER VOLUME . | | Distorted sound | 1. Reduce volume. 2. Check speaker impedance (use 6–16Ω). | | Hum or noise | 1. Check antenna connections (FM/AM). 2. Move receiver away from fluorescent lights or AC transformers. | | No surround effect | 1. Press A.F.D. or Cinema Studio EX . 2. Check that source is Dolby/DTS encoded (e.g., DVD). | | Remote does not work | 1. Replace batteries. 2. Clear obstructions between remote and receiver. 3. Press AMP (or RECEIVER ) button first to control the receiver. | | PROTECT appears on display | The unit has detected a short or overheating. Turn off, disconnect all speakers, check wires, then reconnect one by one. |
The Sony STR-K670P Go to product viewer dialog for this item. sony str k670p manual
Press on remote repeatedly to set the unit to turn off after: 90 → 80 → 70 → … → 10 → OFF minutes. | Problem | Likely Cause & Solution | | :--- | :--- | | | 1
: Detail on power output (watts per channel), total harmonic distortion, and frequency response. Exploded Views Press MUTING on remote
