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8.4
POWER
AMPLIFIER
SECTION
1.
Do not
connect
load
to
speaker
terminals"
VOLUME Control
set
at minimum.
2.
Set power
boosting
switch
to
4CH
position.
Then energize
unit.
3.
For first
approximately
six
seconds,
the
relay
remains open, keeping
the
unit
muted.
Confirm that all
voltages are
as
indicated
in
the
circuit
diagram on page
98.
4.lt
voltages
are greatly different from
rated
values,
shut
off
power
immediately.
Check
suspicious
areas,
especially
power supply unit.
5.
If
the relay
opens
immediately after the power
Bottom View
GIX-g4gA
amplifier
has been
come
into
operation,
a
defect
in
the
output
transistors
can be
suspected.
Check
the output
stage.
6.
After
approx.
10- 20
minutes
of
warming-up
time,
adjust VRB
so that the
voltage
across
terminals
1
and
2 of
the
power
amplifier
assembly becomes
20mV.
7.
In
the
same
w&y, adjust VR4
to
obtain 20mV
voltage readings
across
the terminals
25
and
26.
8.
Next,
connect
voltmeter between terminal
5 and
ground. Adjust
VRl
to obtain 0V
reading.
9.
In
the
same w&V, adjust
VR2
to
obtain
zero
readings
between
terminal 23 and ground.
Top View
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31
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