Lexicon Power Amplifier RX-7 - Manual (Page 21)

ZX-7/RX-7 Basic Operation
2-11
PROTECTION MODE
The ZX-7/RX-7 is equipped to protect itself against potentially
damaging conditions such as overheating, mis-wiring and electrical
failures. Under such conditions, the ZX-7/RX-7 will enter a
protection mode. When this occurs, the unit will mute to protect
itself and speakers from potential damage.
If the ZX-7/RX-7 enters protection mode (mutes itself):
1. Immediately power off the unit with the rear panel master
power switches and disconnect all AC power cords.
2. Examine all speaker connections to ensure there are no shorts.
Power on the ZX-7/RX-7. If the unit remains in a muted state, contact
Lexicon customer service for assistance.