Onkyo TX-4500 - Alignment Procedure; Center Voltage Adjustment; Idling Current Adjustment; Protective Circuit Adjustment

ALIGNMENT
PROCEDURE
INSTRUMENTS REQUIRED GENERAL ALIGNMENT CONDITIONS
1.
DC
Ammeter
1.
Signal
input
should
be
kept
as
low
as
possible.
2.
DC
Voltmeter
2.
Standard
modulation
is
400Hz
30%
(AM),
400Hz
100%
3.
AM/FM
Sweep
Generator
(FM
MONO),
pilot
10%
sub
and
main
90%
(FM
STEREO).
4.
AM/FM
Signal*
Generator
3.
Standard
knob
position
5.
Vacuume
Tube
Voltage
Meter
(VTVM)
AC,
DC
SPEAKER..........
A
VOLUME.......
Maximum
6.
Oscilloscope
BASS,
TREBLE
&
BALANCE............
Center
7.
Monitorscope
LOW
&
HIGH
FILTER........0.00000.....
OFF
8.
Distortion
Analyzer
MODE
................
STEREO
9.
Stereo
Modulator
LOUDNESS.......
OFF
10.
Frequency
Counter
MUTING
LOCK
&
DOLBY
ADAPTOR.........
OFF
11.CR
Oscillator
TAPE
1,
2,
3....ccccceececeeeeceeeeneceneeeeeeerresseeessenes
OFF
(SOURCE)
CENTER VOLTAGE ADJUSTMENT
Connect
a
8-ohm
load
resistor
across
the
SPEAKER
terminals.
Connect
the
DC
Voltmeter
between
CT
and
E
terminal.
TX—4500
Adjust
the
voltage
to
O0&20mV
with
R504.
(Left
channel)
Adjust
the
voltage
to
0420mV
with
R604.
(Right
channel)
TX—2500
Adjust
the
voltage
to
0t40mV
with
R504.
(Left
channel)
Adjust
the
voltage
to
0£40mV
with
R604.
(Right
channel)
NOTE:
Adjust
after
switching
on
for
10
minutes.
IDLING CURRENT ADJUSTMENT
Connect
the
DC
Voltmeter
between
ID
and
CT
terminal.
TX—4500
Adjust
the
voltage
to
20¢5mV
with
R518.
(Left
channel)
Adiust
the
voltage
to
20tSmV
with
R618.
(Right
channel)
TX--2500
Adjust
the
voltage
to.20t5mV
with
R514.
(Left
channel)
Adjust
the
voltage
to
20tSmV
with
R614.
(Right
channel)
NOTE:
Adjust
after
switching
on
for
10
minutes.
Open
load
VOLUME
........
Minimum
TAPE
MONITOR-1........
ON
PROTECTIVE
CIRCUIT
ADJUSTMENT
SPEAKER terminals
2.5-ohm or 4-ohm
Load Resistor
TAPE-1
Differentiation
Circuit
CR
Oscillator
TX—4500
JUL
50Hz 3Vp—p
Load Resistor
CR
Oscillator
Relay
Adjust
R537
(Left channel)
R637
NOTE: VOLUME.....Maximum
TAPE MONITOR- 1.....ON
4-ohm, 100W
2.5-ohm, 100W (Right channel)
fig-10 Differentiation Circuit
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