Onkyo A-10 Service Manual

SERVICE PROCEDURES
1. IDLING CURRENT ADJUSTMENT
Connect the DC voltmeter between ID-CT terminals.
Adjust thé voltage to 40 + 10mV with R22.
NOTES: Adjust after switching on for 10 minutes.
Open Load Volume ... Minimum
2
CURRENT
DETECTOR
LEVEL
ADJUSTMENT
TAPE
§1
|
CR
Differentiation
SPEAKER
Terminals
ircul
A-10
2
or
3
ohms
Oscillator
SLA.
Circuit
aN
onr
S0Hz
3Vp.
p
Load
Resistor
0.1¢K)
3.3K
Apply
a
tone
burst
signal
to
the
TAPE-1
terminal, connect a 2 ohm hollow resistor
to the speaker terminals and adjust
variable resistor R61 so that the relay is
operated at maximum volume. Confirm
that the relay is not operated when the
3 ohm hollow resistor is connected.
Differentiation Circuit
NOTES:
Adjust
after
switching
on
for
10
minutes.
VOLUME
—
Maximum
3.
CENTER
VOLTAGE
CHECK
When
the
transistor
of
the
differential
amp
(Q1)
of
the
power
amplifier
(NADA-405a)
or
the
constant
current
circuit
(Q3)
has
been
replaced,
check
the
center voitage.
(Check method)
Connect
a
DC
VIVM
between
the
CT-E
terminals
and
check
if
the
reading
of
the
DC
VTVM
is
within
30mV
of
the
rated
voltage.
When
outside
the
rated
voltage,
cut
or
connect
the
jumper
wires
(J1,
J2)
by
referring
to
the
below
table.
Perform
this
check 10
minutes
after
the
power
switch
has
been
set
to
ON.
Cut
~18
~-22mV
The
center
voltage
when
iumpers
J1,
J2
are
connected
was
assumed
to
be
OmV.
NOTES:
4. REMOVEMENT OF THE POWER AMP. PC BOARD
(1)
Remove
four
screws
which
hold
the
top
cover
to
the
chassis
and
lift
off the
top
cover.
(2)
Remove
four
screws
which
hold the
cover
to
the
hiat
sink.

Onkyo A-10 Specifications

General

Brand	Onkyo
Model	A-10
Category	Amplifier
Language	English