Yamaha EZ-AG Service Manual page 17

TEST
7-seg. LED for Each Test
No.
20
21
25
30
36
37
41
42
43
45
48
* NOTE: Time is required to complete the checks performed by test No. 41–45.
Check the switches and the LEDs on the panel.
Press the switches as shown on the LEDs in the sequence indicated in TABLE 1 (P.18).
or
A sound is generated while the fret switch is pressed. (No key stick is existed.)
Press the [DEMO] button to interrupt operation.
Check that all the 7-seg. LEDs on the panel light up.
Make sure that all 7-seg. LEDs on the panel light up.
Check that all the fret LEDs light up.
LED from 1st fret to 6th fret is to be turned on in each string. Then thing that brightness
isn't equal too much. Press [E5] (1st string, 12th fret) and then move to the next string.
All the fret LEDs will go out.
Check that the all the fret LEDs go out when the [DEMO] button is pressed.
String check 1. (The case of plays the string strongly)
Play the strings in sequence from the 1st string (the string
from the row that lights up the 6th fret LED). Check that
the level it was played is the maximum and that the LED
for 6th fret for the next row (2nd string) lights up. Then
move to checking the 2nd string. (Then play the 3rd, 4th,
5th and 6th strings.)
Last 2 digits on the 7-seg. LED display the intensity of playing. (MAX. 7F)
* Be careful not to bend strings by strong playing.
String check 2. (The case of plays the string weakly)
After it was "
with the same strength (at the level that the 4th fret lights up), check that any extremely
different frets are not lighted up.
Use LED of fret 1st~5th show the datum of scaling done with peak value. Note that the if
a string is not played for more than 0.8 seconds, the peak value is reset.
Check for the lighting-up of one of 3rd to 5th fret LEDs on each string.
Mute check.
While touching on the earth plate of the neck back, in the condition where it actuated
with the dry cell battery it touches on the MUTE plate.
Check that the 6th fret LED from 1st to 6th string is turned on.
Check the MIDI.
After connecting the [MIDI IN] jack and [MIDI OUT] jack with a MIDI cable, execute
or
the test. Check that the C4 note is output.
Check the ROM. (IC302)
or
Checks the ROM that is connected to the CPU bus. It takes about 3 seconds.
Check the RAM. (IC303)
or
Checks the RAM that is connected to the CPU bus. It takes about 3 seconds.
Check the WAVE ROM. (IC201)
or
Checks the WAVE ROM that is connected to the CPU bus. It takes about 15 seconds.
Check the FLASH ROM. (IC305)
or
Checks the FLASH ROM that is connected to the CPU bus. It takes about a minute.
End the test mode.
Exit from the test program when executing this test.
Test Function and Judgment criteria
" to the decision. When picking 1st through 6th strings simultaneously
EZ-AG
strongly weakly
Testing frets will light up.
1 fret 5 fret
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