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Fisher CA-890 - Power Amplifier Adjustment

Fisher CA-890
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POWER
AMPLIFIER
ADJUSTMENT
BEFORE
ADJUSTMENT
Unplug
the
AC
power
cord
and
set
the
front
panel
controls
as
follows:
e
Power
switch
to
the
OFF
position.
e
Setthe
SPEAKERS
switch
to
the
OFF
position.
e
Setthe
volume
level
to
a
minimum
level!
by
Pressing
the
VOLUME
DOWN
button.
e
IDLING
CURRENT
ADJUSTMENT
VR501/VR502
(on
the
Main
Amplifier
P.C.Borad)
setting
to
me-
chanical
center
position.
e
Connect
the
AC
power
cord
and
Power
switch
to
the
ON
position.
IDLING
CURRENT
ADJUSTMENT
This
adjustment
is
very
sensitive
to
changes
in
ambient
temperature.
Allow
set
to
operate
for
5
mi-
nutes
before
attempting
this
adjustment.
LEFT
CHANNEL
AMPLIFIER
1)
Connect
the
DC
Voltmeter
between
Pins
T501
and
T502
on
the
Main
Amplifier
P.C.Board.
2)
Adjust
the
VR501
for
an
indication
of
15mV
(1OmV
~
35mV)
on
the
DC
Voltmeter.
RIGHT
CHANNEL
AMPLIFIER
1)
Connect
the
DC
Voltmeter
between
Pins
T503
and
T504
on
the
Main
Amplifier
P.C.Board.
2)
Adjust
the
VR502
for
an
indication
of
15mV
(10mV
~
35mV)
on
the
DC
Voltmeter.
AMPLIFIER
P.C.BOARD
LAYOUT
ALIGNMENT
POINTS
(TOP
VIEW)
re
ef
VR501
VR502
T502
Main
Amplifier
P.C.Board
-12-

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