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Onkyo A-8500 Service Manual

Onkyo A-8500
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A-8500
ADJUSTMENT
PROCEDURES
Adjustments
and
Checking
the
Protection
Circuitry
1.
Preparations
1)
Place
the
unit
on
the
workbench.
(There
should
be
about
15
mm
of
space
between
the
base
plate
of
the
unit
and
the
work
surface.)
2)
Set
up
the
unit
as
follows.
(1)
No
load
(2)
No
signal
(3)
Volume
turned
all
the
way
down
(4)
Speaker
switch
OFF
(5)
Power
switch
OFF
Note)
Check
the
following
points
before
making
adjustments
(1)
The
power
switch
should
be
OFF.
(2)
The
interior
of
the
unit
should
not
be
warm.
2.
Idling
current
adjustment
1)
Turn
the
power
switch
ON
and
allow
the
unit
to
warm
up
for
about
10
minutes.
(1)
Adjust
R535
(R635)
so
that
the
voltage
at
test
point
VCT-IID
on
the
NAAF-3601
circuit
board
is
15mV+S5mV.
Note)
Semi-fixed
resistors
enclosed
in
parentheses
(
)
are
for
the
right
channel.
3.
Check
of
operation
of
protection
circuitry
1)
Check
of
operation
of
protection
relay
(1)
Confirm
that
the
relay
turns
ON
approximately
5
seconds
after
the
power
switch
is
turned
ON.
(2)
The
SERVO
indicator
LED
should
light
at
the
same
time.
(3)
The
relay
should
turn
OFF
approximately
0.5
seconds
after
the
power
switch
is
turned
OFF.
2)
Check
of
DC
detection
and
servo
circuitry
operation
(1)
Turn
the
power
on
with
no
load.
(2)
After
the
speaker
relay
turns
ON,
apply
DC+200mV
to
the
CD
input
terminals.
Confirm
that
the
relay
turns
OFF.
(3)
Confirm
that
operation
is
the
same
as
(2)
above
when
an
input
of
DC—200mV
is
applied.
Note)
Under
no
circumstances
connect
a
load
or
short
the
speaker
terminals
when
performing
the
above
test.
3)
Signal
input
from
the
circuit
illustrated
below
with
no
load.
(1)
Confirm
that
the
speaker
relay
does
not
turn
OFF
even
when
a
2
ohm
load
is
connected
when
a
peak
value
of
30V
p-p
ts
output.
(2)
Next,
confirm
that
when
a
1
ohm
load
is
connected
the
speaker
relay
switchse
OFF
and
ON
a
couple
of
times
and
then
stays
OFF.
Note)
The
period
before
that
relay
stays
OFF
should
not
last
for
more
than
|
minute.
Relay
OFF
status
can
be
canceled
by
switching
the
power
OFF.
Low-frequency
oscillator
Amplifier
SP
Load
OUT
ae
Differe-
ntiator
Attenua-
tor
Square
wave
The
unit's
volune
90Hz,
LOY
p-p
control
may
also
|
be
used.
Oscillo-
scope
3.3
KQ
O.1
“uF
3.3
KQ
OUTPUT
Square
wave
input
fron
low-frequency
oscillator
10
KQ
00
Hz,
10¥
p-p
WA

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Onkyo A-8500 Specifications

General IconGeneral
BrandOnkyo
ModelA-8500
CategoryAmplifier
LanguageEnglish

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