Tip & How-To about Audio Players & Recorders
Quite often a receiver or amplifier will show the message "protection" or "protector". Other times, the unit will return to the standby mode and possibly blink the standby light. This is a protective mode that causes the shutdown of the unit to "protect" it from further damage.
Most modern electronics contain additional circuits that monitor the state of the unit. If a problem is detected, the unit is shutdown and a message of some type is displayed as detailed above. This is done to prevent further damage to either the unit itself or any external speakers or equipment.
Lets determine whether the problem is internal or external:
1) Disconnect any external equipment (speakers are the most common).
2) Power off the unit.
3) Turn it on again (this will reset the protection circuit)
If the protection message clears, the external equipment is the likely cause. Crossed speaker wires is the most common cause. If the unit continues to display the protection message, then the problem is internal and the unit will require service.
The most common internal cause is a failure of the output transistors. These can be easily replaces by an experienced service tech. Some units have complete amplifier sections contained within amp-pacs or large ICs often called STKs. They are so called because the generic part numbers for tehm are often STK-xxx. Panasonic uses large ICs with part numbers that start with SVI as well. If you are experienced with audio repair, a simple check of the transistors and the voltage regulators within the same circuit can often reveal teh cause of the problems.
Hope this helps,
Posted by ABRsvcs on
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