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13
Sentry Monitor Reset
Sentry Monitor provides protection for the MC3500 by
monitoring Output. In the event of a large impedance
mismatch, a short circuit at the Output Terminals, or
Tube failure, Sentry Monitor will activate to prevent
potentially destructive levels of current from flowing.
When Sentry Monitor is activated, the MC3500 will
power off, and the Standby LED will flash.
To reset the Sentry Monitor Protection Circuitry, turn
the Power Control Knob to OFF. (See “Power Control”
on previous page). Then, turn the Power Control Knob
to ON.
If Sentry Monitor continues to engage, the problem
must be fixed before continuing. Check that
wires connected to the Output Terminals and the
Loudspeaker Terminals are not shorted. If those
connections are fine, and the Impedance of the
Loudspeakers is close to the value of the connected
Output terminals, the issue may be a defective tube.
When the MC3500 doesn’t return to Normal
Operation after the Power Switch has been switched
back ON, then place the Power Switch in the OFF
position and disconnect the AC Power Cord from
the MC3500. Then contact your McIntosh Dealer for
repair of the Power Amplifier.
While the Knob is set to either WATTS or HOLD, the
Power Output Meter light will be powered On/Off by
a Preamplifier or A/V Control Center connected by
a Power Control Cable if that unit has Power Control
capabilities.
If the Knob is set to LIGHTS OFF, the Power Output
Meter light will be permanently off, and the Meter
will respond as if the Knob was set to WATTS.
Input Switch
The Input Mode Switch, which is
located on the Rear Panel of the
MC3500, allows selection of either
the Balanced or Unbalanced Input.
Refer to figure 12.
Auto Off Switch
The MC3500 incorporates Power Save Circuitry to
automatically place the MC3500 into the power saving
Standby Mode approximately 30 minutes after there
has been an absence of an audio input signal.
When there is a Power Control
Connection between the MC3500
and a Preamplifier with Power
Save Circuitry, the AUTO OFF
Switch is bypassed (located on the
Rear Panel of the MC3500). Refer to figure 13.
In the event there is no Power Control Connection and
the Power Save Circuitry is activating inappropriately
relative to your specific use of the MC3500, place the
AUTO OFF Switch in the DISABLED position.
If the Power Save Circuitry has switched Power to the
MC3500 OFF, place the POWER in the OFF Position
and then in the ON position to reset the circuitry.
Figure 12
BALANCED
UNBALANCED
INPUT MODE
ENABLED
DISABLED
Figure 13
AUTO OFF
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