Service manual
Checkau
Procedures
5.13
Crosstalk
Prccedure
Shed:
inject
a
6Q
Hz
sine
wave.
REF
I
out-
s~@@:
-6048
at
20
kHz,
put
level
=
46
VAC.
REF
I!
output
fewel=
28
VAC.
After
Injt[g[
C@nd[tisns:
Controls
per
standard.
T~rmi~ai;e
in-
put
of
channal
not
driven
with
800
ohms,
P~@~@@uP@:
8
ohm
load
on
each channel,
Inject
a
20
kHz
sine
wave
into
the
ehannei
1
input
and
inereass
sutput
level
to
full
pawer
(REF
f
=78
VAC,
REF
11
=52
VAC)*
For
REF
l
measure
less
than
78
mVAC
at
the
output
of
channel
2,
For
REF
is
measure
less
than
52
mVAG
at
the
output
of
channel
2.
Repeat
by
injecting
the
signal
into
channel
2
and
measuring
channel
1.
5.14
Output
Power
For
12@V
@@Hz
enftg:
Spec
sf
8
OAm
Stereo:
REF
I
z
780W
a"lQ.62%
THO,
REF
fl
2
355W
at
8,82%
THB.
Spas
st
4
Ohm S~~PBQ:
REF
I
r
1
'I
60W
at
O-02%
THD.
REF
if
a
555W
at
0,02%
THD,
Far
lntsrnatignal50Hz
unl%:
%pee
gt
8
Ohm
%tare@:
REF
Ii
a
7750W
at
O,S
%
THD,
REF
If
a
355W
at
0.1
9&
TWD,
spec
af
4
Ohm
B8t@reo:
REF
i
2
1095W
at
8.1
%
IHD.
REF
::
11
2
535W
at
0.1
%
THD,
Inlt%al
C@@difi@~$::
Controls
per
standard.
Figure
5.4
Inductive
Load
Cojd
Proced~re:
Load
each
channel
tea
8
ahrns.
lnject
a
1
kHz
sins
wave
and
measure
output
power?
at
speei-
fied
TWD,
with
both
channels driven.
Next,
load
each
channel
to
4
ohms,
Inject
a
3
kHz
sine
wavg
and
measure
output
pawer*
at
specified
THD,
with
both
channefs
driven.
5,15
RsaeSIve
Loads
Spge:
No
oscillations.
Safe
with
ail
types
of
Soads.
llnltlal
C@nd%Olons:
Controls
per
standard.
Procadurn
Capaeitiue:
Load
each
channel to
8
ohms
in
parallel
with
2
yE
Inject
a
29
kHz
sina
wave,
REF
I
output
ievei
=
45
VAC,
REF
II
sutput
level
--
30
VAC.
Drive
load
for
1
0
seconds>
No
oseiliations.
Proeed~r~
Onductiv~:
Load
each
channel
1s
8
ohms
in
parallel
with
159
yHenriss.
Inject
a
1
kHz
sine
wave,
REF
I
output
level
=
36
VAC*
REF
fI
satput
Ieval
=
28
VAC,
See
Figures
5,4
and
5.5
for
typical
wavsform
shapes,
Test
duration
is
5
sscsnds.
ProseBure
To@uf@:
Load
each
channel
with
Zhs
primary
(red
and
black
Beads)
sf
a
PSU
transformer
$D
7040-
51,
inject
a
20
Hz
sine wave
into
each
channe!,
REF
I
output
level
=
40
VAC*
REF
11
output
Ievd
--
375
VAC.
Observe
3
to
7
flyback
pulses
in
both
polarities,
Test
duration
is
10
seconds,
See
Figure
5,6
far
typical
waveform
shape,
I
Electrical
Checkout
5-3