Yamaha SP2060, Руководство по обслуживанию

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SP2060
42
*** 13. LCD ***
OK:[ENTER],NG:[0]
1
Make sure that all the screen is shown in black and white.
The reversing cycle shifts the display every second repeating it for five seconds.
2
Make sure that there is no dot missing throughout the screen.
Troubleshooting:
In case of NG, check the signal passing through the CN270 of DSP circuit board.
Or the LCD module is defective.
3-7. LED Test (NO. 14)
Content: Check visually if LEDs on the panel light on in the designated order.
Example of execution screen
3-6. LCD Test (NO. 13)
Content: Check visually if entire LCD displays black and white repeatedly.
Example of execution screen
*** 14. LED ***
OK:[ENTER],NG:[0]
As for the order of lighting, each lights on one by one from the left side of the panel to the right side.
When all LEDs have lighted on, all light on, which makes the completion of the test.
(All light on to confirm the LED’s brightness.)
Troubleshooting:
In case of NG, check the signal passing through the CN250 of DSP circuit board.
Or the LED is individually defective.
3-8. SWITCH Test (NO. 15)
Content: Press every key on the panel in a designated order, and check to see if they respond.
Example of execution screen
*** 15. SWITCH ***
Hit the key
[BACK ]
NG:[ENTER]
OPERATION
1
Press keys according to characters displayed on the personal computer.
2 When the displayed key and the pressed key match each other, the name of another test key will be shown on the personal
computer 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 the
personal computer as a detected disagreement.
If there is no response after pressing a key, it is considered as a failure.
In this case, returns to the testing item selection list screen by pressing the [ENTER] key of the personal computer.
3 If it turns to be OK after all keys have been examined, the program returns to the testing item selection list screen.