Yamaha n8 Service Manual page 75

2-4. LED lighting test
2-4-1. Outline
Tests if the LEDs light normally.
Conducts tests including sequential tests.
2-4-2. Test contents
First, all the LEDs on the panel will light.
W
Then, press the [ ] (PLAY) key to proceed to lighting color by
color.
W
Each time the [ ] (PLAY) key is pressed, the lighting color by
color changes in the order of (green + white) " red " orange.
Then each LED lights sequentially from upper left to lower
right side on the panel, and fi nally, all the LEDs will fl ash at the
same time.
Check visually if the LEDs light normally.
W
Press the [ ] (PLAY) key to fi nish the test.
A
Press the [ ] (STOP) key to abort the test.
2-4-3. Execution of test from PC
(1) Transmits the MIDI command (A0 44 00) to execute the
test.
(2) MIDI command (A0 44 02) will be received if the test
result is OK and MIDI command (A0 44 03) will be
received if the test result is NG.
• Example of executing screen
* Refer to "3. List of test items" for details. (Page 80)
2-4-4. In case of executing tests from n8 or n12
Press the [MONITOR REMOTE: ON] key and [CLICK
REMOTE: ON] key simultaneously to start the test.
2-5. Test around audio
2-5-1. Outline
Conducts SSP1 ⇔ DICEII audio loopback test and SSP1 (Main)
⇔ SSP1 (Sub) A-BUS connection test.
2-5-2. Test contents
• SSP1 ⇔ DICEII audio loopback test
Audio line between SSP1 and DICEII is connected as
follows.
IN and OUT are directly connected (through) in the DICEII
during audio loopback test.
Writes test data sequentially to all the audio lines connected
from SSP1 to DICEII.
If the signal loopbacked by the DICEII and returned to the
SSP1 is the same data as the written data, the result is OK.
As short checking is conducted as well, signals different to
each other are written to all the lines simultaneously and
signals returned to the SSP1 are read respectively and judged
as OK if the signals are the same as the written signals.
This test also checks MUTE-related lines (MUTE, MUTE
CLR) between the MLAN circuit board and DM circuit
board.
(1) Execution of loopback test during MUTE OFF
Submits MUTE OFF processing from the SSP1 to DICEII.
This inactivates the MUTE of GPIO of DICEII.
Then, loopback test is conducted and judged OK if the
output data and the returned data are the same.
(2) Execution of loopback test during MUTE ON
Submits MUTE ON processing from the SSP1 to DICEII.
This activates the MUTE of GPIO of DICEII.
Then, loopback test is conducted and judged OK if the
result of the comparison test is NG.
(3) Executes loopback test during MUTE OFF again.
Submits MUTE OFF processing from the SSP1 to DICEII.
This inactivates the MUTE of GPIO of DICEII.
In addition, MUTE CLR line is activated from SSP1 and
"AND circuit" of DICEII audio IN/OUT is opened.
Then, loopback test is conducted and judged OK if the
output data and the returned data are the same.
6 7
F/W 3/4 to 13/14 F/W 1/2 to 11/12,
SSP1 (Main) SSP1 (Sub)
F/W 1/2 to 15/16
n8/n12
8
F/W 1/2 to 15/16
IN/OUT directly
DICEII
connected
15/16
8
75