Checking the Display
DISPLAY SELF-TEST MODE
When the keypad/display is receiving power from the power supply but is not in proper communication
with the digital board, the keypad/display board enters self-test mode. In self-test mode, the display
remains blank until you press the buttons on the control panel. Pressing various control panel buttons
will cause the display to print characters, home the cursor, etc.*
Using Self-test Mode to Diagnose the Keypad/Display Board
1.
If the unit comes in with a blank display, but is in self-test mode (i.e., the display prints
characters when buttons are pressed according to the chart below) this indicates the problem is either
the digital board or the communication link between the digital board, keyboard and the
keypad/display board. Before replacing anything, check all connections, particularly the 20-pin cable
to the keyboard.
If pressing buttons causes only the leftmost character of the display to change, this usually indicates a
defective cable connection (20-pin ribbon cable) between the digital board and keyboard or possibly
a bad keyboard.
2.
If the unit is in self-test mode but the display does not respond according to the chart below,
the problem is most likely in the keypad/display board. If certain buttons do not function properly
during normal ASR-10 operation, test them while the display is in self-test mode.
If you can’t isolate a problem that seems related to the display, the display can be forced into Self-test
mode using the following procedure. With the power off, face the front of the unit, then jumper the
minus
(-)
side of C83 (located below
J5,
the digital jack board connector) to pin 1 of U64
(74F74,
next
to
JS).
On power up, the display will stay in self-test as long as the jumper is connected, allowing you to
check the keypad/display board independently. The chart below details how the control panel buttons
are mapped in self-test mode:
Press:
LOAD
COMMAND
EDIT
INSTRUMENT
SEQ*SONG
SYSTEM~MIDI
EFFECTS
l/ENV
1
2lENV 2
3fENV 3
4/PlTCH
S/FILTER
6lAMP
7fLFO
8fWAVE
g/LAYER
O/TRACK
up Arrow
Displav Reads:
8
$
1.
3
9
I
+
0
1
6
7
<
=
(Home Cursor)
(Home Cursor)
*
3.
Press:
Down Arrow
Left Arrow
Right Arrow
CANCEL*NO
ENTER*YES
Instrument-Track 1
Instrument*Track
2
Instrument*Track
3
Instrument*Track 4
Instrument*Track
5
Instrument*Track 6
Instrument*Track
7
Instrument*Track
8
EFFECT SELECT*BYPASS
SAMPLE
RECORD
STOP/CONTINUE
PLAY
Displav Reads:
4.
;
;Home Cursor)
Space
&
;
(Home Cursor)
5.
4
2.
>
0.
5
6.
16
ASR Service Manual
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