Mark Levinson ML-50 User manual

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The amplifier has three operating states:
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To access the unit’s internal webpage for the first time:
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Settings Cable Connections
115200 RJ25/RJ11 Pin 2 goes to DB-9 Pin 3
8 Bits RJ25/RJ11 Pin 3 goes to DB-9 Pin 2
No Parity RJ25/RJ11 Pin 5 goes to DB-9 Pin 5
1 Stop Bit
DB9 Pins
OUT_STANDBY !1038 1 – NOT USED NO CONNECTION 1 – NOT USED NO CONNECTION
IN_STANDBY !1039 2 – Data Receive 2 – Data Receive
STATUS !1061 3 – Data Transmit 3 – Data Transmit
STANDBY_NORMAL !1062 4 – NOT USED NO CONNECTION 4 – NOT USED NO CONNECTION
STANDBY_GREEN !1063 5 – Digital Ground 5 – Digital Ground
STANDBY_PWRSAVE !1064 6 – NOT USED NO CONNECTION 6 – NOT USED NO CONNECTION
IP_INFO ipconfig 7 – NOT USED NO CONNECTION
8– NOT USED NO CONNECTION
9 – NOT USED NO CONNECTION
RJ25/RJ11 Pins
RS232 Control Codes
ML-50 RS-232 GUIDE
When code is entered incorrectly the return
prompt will be "Invalid Command. Type
'help' for a list of commands"
When code is entered correctly return
prompt will be "OK"

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 are indicated by a flashing white LED on the front panel. They are neither caused by nor harmful to the amplifier. Non-critical
faultseitherclearthemselvesovertime (such asover temperature) or are easily remedied by the owner without dealerorfactory 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 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 isadvised to callthe dealer or installer in the case of a critical fault, as it may indicate that the amplifier requiresservice.
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 powerbe turned off tobe cleared. However, the owner isadvised 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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