Component Test; Switch Test; Encoder Test - Yamaha DME24N Service Manual

1-17. COMPONENT Test (Speaking Component)
Content: Perform serial data transfer of signals from
the outside via SIOF and DSP of CPU, and then check
if they are the same or not.
LCD Screen
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17. COMPONENT
OK !
NG: COMPONENT ERROR. !
EXIT: [ENTER]
Fig. 38. COMPONENT Test Screen
Message
· When disagreement error occurs between transferred
and received data: NG: COMPONENT ERROR.!

1-18. SWITCH Test

Content: Press every key on the panel in a designated
order, and check to see if they respond.
Sample Executing Screen
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18. SWITCH
Hit the Key
[ SCENE
NG: [CANCEL+HOME]
Fig. 39. SWITCH Test Screen
OPERATION
q Press keys according to characters displayed on LCD.
w When the displayed key and the pressed key match
each other, the name of another test key will be
shown on LCD one by one. When the displayed
key does not match the pressed key, the name of
the displayed key will continue to be displayed on
LCD as a detected disagreement. If there is no
response after pressing a key, it is considered as a
failure. In this case, return to the testing item
selection list screen by pressing both [CANCEL] and
[HOME] keys.
e If it turns to be OK after all keys have been examined,
the program returns to the original testing item
selection screen.
Indicated in case of O.K.
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Indicated in case of NG.
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]
NOTE
· As for the order of the tests, the names of the keys
are shown one by one from the SCENE in the left
side of the panel to the right in the order, and therefore
press the displayed key.
· Since the accuracy of keys is to be tested here, the
LED does not light on even though the key with LED
is pressed.

1-19. ENCODER Test

Content: Check the rotating response of the rotary
encoder. (Visual Inspection)
Turning the encoder clockwise causes the display of a
count number in positive direction, and turning the
encoder counterclockwise causes the display of a
count number in negative direction.
The counting number in each direction is displayed
with a limit at the designated maximum count.
Sample Executing Screen
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19. ENCODER
[JOG]: XX
[JOG]: XX
OK: [ENTER] , NG: [CANCEL]
Fig. 40. ENCODER Test Screen
Count number display at turning in the positive
direction:
Count number display at turning in the negative
direction:
q Start tests with a positive turn, and when the
maximum count is reached, start tests with a
negative turn. The test ends when the maximum
count for negative turn is reached.
w When the displayed count is not correctly updated,
it is considered as a failure. (Visual determination)
※ Set the rotational speed about three seconds per
turn at the total test, and make sure that the count
is updated one count per click.
DME24N/DME64N
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0-20 (Step width = 1)
20-0 (Step width = 1)
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