Marantz 2220 - Audio Adjustment Procedures; Component Location Diagrams

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12. Audio Adjustment
1.
Connect
a
VTVM
across
the
resistor
R747
and
adjust
the
trimming
resistor
R729
until
the
VTVM
reads
7.5mV
DC.
For
the
other
channel
connect
the
VTVM
across
the
R748
and
adjust
jo
the R730
for the
same reading.
2. Connect an oscilloscope across the speaker terminals. Apply an audio signal of 1 KHz to the
AUX jacks and increase the audio signal until the audio output on the scope begin to start
clipping.
Adjust
the
trimming
resistor
R723
for
equal
and
symmetrical
clipping.
For
the
other
channel adjust the R724.
POINTER
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Figure 1. Dial Stringing