Internal Battery Check; Midi Circuitry Check; Cpu Check - Korg A4 Service Manual

<1. INTERNAL BATTERY CHECK
>
(1)
When the test node
is
activated, the voltage of the internal battery
is
checked automatically.
(2)
When
an
error
is
found, all
LEDs on the panel blink, except
PEAK.
The display
will indicate the error details as below.
When the battery
is low,
(—if~
I
i—
i
and
£_/
w
ii|
appear alternately.
When
the
battery voltage
is
high or no battery
is
loaded,
L
[-
LJ
7
'
and ' '
'will
appear alternately.
(3)
When this check ends normally,
the test
function automatically moves on
to the next item to be checked.
<2. MIDI CIRCUITRY CHECK
>
(1)
When the above check ends normally, the test function automatically checks
the MIDI circuitry.
(2)
When an error
is
found, all LEDs
on the panel blink,
except
PEAK.
The display will indicate
the
error details as below.
nd
and
Er~
will appear alternately.
(3)
When this check ends normally, the test function automatically moves
on
to the next item to be checked.
<3.
CPU CHECK
>
(1)
When all the
above checks end normally, the display
will
indicate whether the CPU
mounted on
the main board
is
for GTR or BASS.
Confirm which
it is.
For A4GTR
or
For A4BASS
EE
(2)
When the above display has appeared
for
0.5 seconds, the test function moves on
to the next
check
item.
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