Yamaha SY77 Service Manual page 29
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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
5.
TEST
5;
RAM
BACKUP BATTERY
TEST
'
t
IS:
R/lH
Battery
This
test
checks
that the voltage
of
the
RAM
backup
battery
is
greater
than
2.8V and
less
than 4.1V.
DISPLAY OF
TEST RESULTS
OK
NG
TEST
END
Ends
after
displaying
the
6.
TEST
6;
LCD-ALL DOTS "ON
"
TEST
«
06:
LCD
Al
I
On
Check
that
all
dots
of
the
LCD
change
to
black (ON).
DISPLAY OF TEST
RESULTS
First,
the
display indicates
"* 06
LCD
All
On",
then
all
dots
of
the
LCD
change
to
black (ONl.
TEST END
Press lEXIT] to
end
the
test.
The
display
shown
below
will
appear and
the
SY77
will
wait
for
you
to
enter
a test
number.
DISPLAY OF TEST
RESULTS
First,
the
display indicates
"* 06
LCD
All
OFF",
then
all
dots
of
the
LCD
change
to
white
(OFF),
TEST
END
Press
[EXIT] to
end
the
test.
The
display
shown
below
will
appear and
the
SY77
will
wait
for
you
to
enter a test
number.
Check
that
each
red
LED
blinks
once
in
succession from
the
left
end
of the
unit (refer
to
the
diagram
shown
below) and then
verify
that
all
red
LEDs
blink
together.
Ne>rt,
check
that
each
green
LED
blinks
once,
and
then
all
green
LEDs
blink
together.
The
currently blinking
LEDs
will
be displayed
in
the
LCD
as follows.
*
OS:
RAK
Battery
3.
2V
OK
»
05: RAN
Battery
i.
IV
lev
NC
i
05:
RAH Battery
1.
IV
Hill:
NG
test
results.
S1
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