Mark Levinson 536 Manual page 17

FAULT CONDITIONS
The unit is designed to prevent damage to itself and associated
components. These extensive features protect both the
critical circuitry of the amplifier itself and shield connected
loudspeakers from serious damage due to high power levels.
Basic protections designed into the amplifier include fuses to
protect against excessive current conditions, such as driving
shorted outputs. Inrush limiting prevents premature aging of
the power supply components during power-up; once the power
supply has been charged, this feature goes offline until the
amplifier is powered up again.
The amplifier actively monitors operating temperature, output
current demands and the presence of DC on the outputs. The
amplifier will shut down under any of these conditions and
report the fault via the front panel LED.
NON-CRITICAL FAULTS
Non-critical faults are indicated by a flashing white LED on
the front panel. They are neither caused by nor harmful to the
amplifier. Non-critical faults either clear themselves over time
(such as over temperature) or are easily remedied by the owner
without dealer or factory intervention (such as shorted speaker
terminals). Examples of non-critical faults are:
• Heatsink or internal temperature is above safe operating limits
• Incorrect AC mains configuration
• DC detected at input
• Shorted speaker terminals or extremely low impedance load
connected
If a non-critical fault occurs, check the speaker cables and
terminals and the operation of the preamp in the system. Turn
off the AC power to clear the fault, and then turn the unit on
again after fixing the issue. If the amplifier is too hot, wait for
it to cool down. When it reaches a safe operating temperature
you will be able to turn it on again.
If you are unable to remedy a non-critical fault condition, please
contact your retailer or installer for assistance.
CRITICAL FAULTS
Critical faults are indicated by a steadily glowing white LED on
the front panel. They may be an indication of severe problems
or internal damage to the amplifier. The owner is advised to call
the dealer or installer in the case of a critical fault, as it may
indicate that the amplifier requires service. Examples of critical
faults are:
• Left or right heatsink thermal cutoff switch over temperature
• Transformer over temperature
• DC detected at output (not caused by DC at the input)
• Blown fuses
• Extreme short circuit condition at amplifier output
In the event of a surge or brown out on the AC mains, the
amplifier's protection circuitry may detect mains voltage or DC
rail voltage that is out of the spec. Under those conditions the
amplifier may turn off to protect itself and display a critical fault.
If your amplifier is displaying a critical fault and you suspect a
surge or brown out, turn off the AC power, wait 10 seconds for
the fault to clear, then try turning on the amplifier again.
All critical faults require that the amplifier's AC power be turned
off in order to be cleared. However, the owner is advised to call
the dealer or installer in the case of a critical fault, as it may
indicate that the amplifier requires service.
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/ OWNER'S MANUAL 17