Marantz 4100 - Performance Verification; Preliminary Procedures; Total Hum and Noise Test; Maximum Power Output

15.
PERFORMANCE
VERIFICATION
Test Procedure
A. Test Equipment
Refer
to
Table
1
for
required
test
equipment.
B. Preliminary Procedures
1.
3.
4.
Make
the
test
setup
shown
in
Figure
1
with
the
instrument
controls
set
in
the
following
positions:
Line Switch off
Variable-line Switch variable
Watt Meter Switch on
Variac 0 (fully CCW)
Load
8
ohms
(0.5
mfd
—
off)
Audio
Generator
Frequency
1
KHz
Output
5V
range
Gain minimum
AC
Volt
Meter
30V
range
Make
sure
that
connections
between
the
resistive
load
and
the
system
terminals
of
the
Mode!
4100
have
negligible
resistance
compared
with
the
resistance
of
the
load
itself.
Appreciable
resistance
in
wiring
adds
to
the
total
load,
resulting
in
inaccurate
measure-
ments
of
output
power.
.
Connect
amplifier
output
to
load
and
connect
AC
cord
to
line
power.
Connect
a
short-
ing
plug
to
the
PHONO
input
jack
of
the
model
4100.
Remove the top cover.
C. Total Hum and Noise Test
1.
3.
4.
With
shorting
plugs
connected
to
the
AUX
input
jacks
and
a
8-ohm
resistive
load
connected
across
the
speaker
system
output
terminals,
connect
a
distortion
analyzer
across the load.
NOTE:
In
this
test
and
tests
that
follow,
if
distortion
analyzer
used
does
not
contain
a
built-in
voltmeter,
a
VTVM
may
be
substituted.
Set
the
distortion
analyzer
controls
for
voltage
measurements
and
apply
power
to
the
amplifier.
Set the
VOLUME
control
fully
CCW.
Set
the
SELECTOR
switch
to
AUX
and
the
MODE
switch
to
DISCRETE.
If
the
distortion
analyzer
indicates
more
than
1.5mV,
refer
to
the
trouble
analysis
section
of
this
manual.
~
Set
the
VOLUME
control
fully
CW.
If
the
distortion
analyzer
indicates
more
than
2mV,
refer
to
the
trouble
analysis
section
of
this
manual.
D. Maximum Power Output
1.
Zu,
3.
Connect
the
audio
oscillator
to
the
AUX
input.
Set
audio
oscillator
frequency
to
1KHz.
Set
SELECTOR
switch
to
AUX.
With
the
distortion
analyzer
connected
across
the
output
load
(8-ohm),
set
the
analyzer
on
the
30V
AC
scale.
Turn
the
analyzer
on
and
increase
the
audio
oscillator
output
to
180mV,
and
verify
the
analyzer
indicates
more
than
14.2V.
E. Harmonic Distortion Test
1.
2.
3.
4
Set
the
frequency
of
the
audio
oscillator
and
the
distortion
analyzer
to
20K
Hz.
Set
the
controls
of
the
analyzer
for
voltage
measurement
on
the
30-volt
scale.
Adjust
the
audio
oscillator
output
level
until
the
analyzer
meter
indicates
10.9
volts.
Switch
the
distortion
analyzer
to
Set
Level
—
Manual
mode,
and
adjust
SENSITIVITY
for
full
scale
reading
on
0-1
scale.