Peak Led Check; Test Mode Completion And Data Loading - Korg A4 Service Manual

<9.
PEAK LED CHECK
>
(1)
This test item checks the
operation of the PEAK LED and its
light-up status.
(2)
Set the A4's INPUT volume and OUTPUT volume to MAX.
(3)
Input a
sine wave lkHz/
- 10dBm to the INPUT
jack and confirm that the PEAK LED
lights
red.
(4)
Input
a
sine wave lkHz/
-
14dBm to the INPUT jack and confirm that the PEAK LED
lights orange.
(5)
Input a
sine wave IkHz/-50dBm to the INPUT
jack and confirm that the PEAK LED
1
ights green.
(6)
Input
a
sine wave lkHz/-70dBm to the INPUT
jack and confirm that the PEAK LED
goes out.
INPUT
SIGNAL
PEAK LED
lkHz/-10dBm
lkHz/-14dBm
lkHz/-50dBm
lkHz/-70dBm
<PEAK> lights red
<PEAK> lights orange
<PEAK> lights green
<PEAK> goes out
*
The check items that follow the PEAK LED check are for tests carried out
at the
factory prior
to shipment, and
therefore are not
covered here.
<10.
TEST MODE COMPLETION AND DATA LOADING
>
(1)
Note that there are two methods of ending the test mode.
One method ends the mode without initializing the
A4's data.
The other method involves loading the preload data into the A4
and then ending the test.
(2)
Press
[MODEA]
six times. As
the check items move forward,
confirm that all
LEDs except PEAK blink.
<
Ending the test mode without initializing the
A4's data
>
(3a)
Press
[MODEA].
The test mode will be
ended without initializing the
A4's data.
<
Ending the test mode by loading the
preload data
>
(3b)
Press [WRITE].
The
Preload data
will be loaded into the A4
and the test mode will end.
(4)
On
returning
to the normal mode,
press [PROG EDIT] to confirm that the preloading
has been performed correctly.
Confirm that the A4
GTR LEDs [2-
DIST/OD],
[4:
PITCH. DELAY] and
[5:
CHORUS/FLANGER] are
lit,
or that the A4 BASS
LEDs
[1
:
COMP.
DYNA EX] and [2: 6
BAND EQ] are
lit.
17