Cassette Deck · Pioneer · TX-8800
Diagnosis: Protection Relay Won't Click
The receiver is staying in protection mode or its speaker relay is not engaging.
Safe first checks
- Disconnect all speakers and speaker wires, then power the unit on again.
- Wait at least 10 seconds; some receivers delay the relay at startup.
- If the relay engages with speakers disconnected, inspect the speaker wiring for a short.
- If it never engages, do not connect speakers until a technician checks the amplifier for DC offset or a power-supply fault.
Bench Technician Steps
This is the model of work a qualified electronics technician follows using the exact service manual and suitable test equipment. It is not a do-it-yourself instruction to work on energized equipment.
- With speakers disconnected, verify the protection circuit, relay contacts, output-stage devices, and power-supply rails against the model-specific service documentation.
- Check for excessive DC at the amplifier outputs and investigate any imbalance before reconnecting speakers.
- Verify the relay-drive and protection-sense circuit only after the amplifier and supply stages have been evaluated safely.
Guided follow-up
Ask the Repair Assistant
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