Yamaha SY77 Service Manual page 41
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Also See for SY77:
- Operating manual (268 pages) ,
- Service manual (57 pages) ,
- Midi data format (20 pages)
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SY77
SY77
to
TEST
31).
The volume
control
must
be
set at
maximum
for
these checks. While sounding, the
LCD
will
display the following.
message:
*
34:
UlU
to
R2->
R2
Output
On
Listed
below
are
the
specifications
and
conditions
of
each output
during
this test.
OUTPUT
R2
:
1kHz±1.5Hz,
sine
wave,
distortion
0.2%. -
1.0dB±2dB
(10k
ohm
load!
OUTPUT
R1
:
less
than
-70dB
OUTPUT
LI
:
less
than
-70dB
OUTPUT
L2
:
less
than
-70dB
PHONES
(R)
;
1kHz,
sine
wave,
distortion
0.2%
or
less,
+5.0dB±2dB
(150
ohm
load!
TEST END
Press (EXIT) to
end
the
test.
After pressing (EXIT) three things occur;
1
1
1
the following
display
will
appear,
(2)
the
sound
will
stop
and
(3)
the
SY77
will
wait
for
the entry
of
a
test
number.
*
34:
Hilt
to
H2->
It
Output Off
35.
TEST
35:
1kHz
FM SOUND OUTPUT
(OUTPUT
L2
OUTPUT
LI)
TEST
t
35:
iUlt
to
L2->
LI
ITEMS
TO CHECK
Check
that
when
the plug
connected
to
OUTPUT
L2
is
pulled out,
the
signal
being
output
from
OUTPUT
L2
is
now
output
from
OUTPUT
LI.
The
basic
signal
route
is
the
same
as
it
was
for
TEST
33.
Insert
the appropriate
1/4" phone
plug
into
OUTPUT
LI
and
verify,
if
necessary, the frequency,
output
waveform,
output
level,
and
THD
of this
output
using the previously
specified test
equip-
ment
(refer
to
TEST
31
).
The volume
control
must
be
set
at
maximum
for this test.
While sounding,
the
LCD
will
display the following
message:
*
35:
IKIIz
10
L2->
LI
Output
On
The
specifications
for this
test
are
as follows:
OUTPUT
LI
:
1kHz,
sine
wave,
-1.0dB±2dB
(10k
ohm
load)
TEST END
Press [EXIT] to
end
the
test.
After pressing [EXIT] three things occur;
(1)
the following display
will
appear,
(2)
the
sound
will
stop
and
(31
the
SY77
will
wait
for
the entry
of
a test
number.
*
35:
IK1I2
to
L2->
LI
Output
Oil
36.
TEST
36:
1kHz
FM
SOUND
OUTPUT
(OUTPUT R2
OUTPUT
R1)
TEST
»
36:
HIU
to
R2->
Rl
ITEMS
TO CHECK
Check
that
when
the plug
connected
to
OUTPUT
R2
is
pulled out,
the
signal
being output
from
OUTPUT
R 2
is
now
output
from
OUTPUT
R
1
.
The
basic signal route
is
the
same
as
it
was
for
TEST
34.
Insert
the appropriate 1/4"
phone
plug
into
OUTPUT
R1 and
verify,
if
necessary, the frequency,
output
waveform,
output
level,
and
THD
of
this
output
using the previously specified
test
equip-
ment
(refer
to
TEST
311.
The volume
control
must
be
set
at
maximum
for this test.
While sounding,
the
LCD
will
display the following
message;
63
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