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McIntosh MC303 User Manual

Page 11

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11

Power On

To have the MC303 automatically turn On or Off when an

A/V Control Center or Preamplifier turns on or off, rotate

the power switch to the REMOTE

position. For manual operation,

rotate the power switch to the ON

or OFF position as desired. Refer

to figure 8.

Note: There must be a power con-

trol connection between the

MC303 and the A/V Control

Center or Preamplifier, in

order for the remote power

turn-on to function.

Meters

Rotate the METER LIGHTS Switch to select the Meter Il-

lumination Mode you desire. Refer to figure 9.

OFF - Meter Illumination

is switched OFF and

the meters will con-

tinue to indicate the

power output.

AUTO - Meter Illumination

is switched ON.

When Power Control

Input of the MC303

is connected to an

A/V Control Center

or Preamplifier with

Remote Meter Illumination Control, the Meter

Illumination will automatically be remotely

controlled (On/Off).

The MC303 Meters respond to all the musical informa-

tion being produced by the three Power Amplifier Circuits.

Refer to figure 10. They indicate to an accuracy of at least

95% of the power output with only a single cycle of a

2000Hz tone burst.

How to Operate

How to Operate

Figure 8

Figure 9

Figure 10

Power Guard

During normal operation, the Front Panel Power Guard

Indicators will momentarily illuminate during peaks in the

audio signals. Refer to figure 11. In

the event the MC303 overheats, due

to improper ventilation and/or high

ambient temperature, the internal

protection circuits will activate. The

Front Panel Power Guard Indicators

will continuously illuminate and the audio will be muted.

When the MC303 has returned to a safe operating tem-

perature, normal operation will resume.

Figure 11