Yamaha PX10, Service Manual

Page: 45 / 148

45
PX10/PX8/PX5/PX3
5-9-3. LCD-CONT (Contrast, Service Only)
Contents Inspect the LCD contrast visually.
Confirm the change of the minimum
→
maximum
→
center luminance visually.
Advance preparation None.
〈
Service inspection screen
〉
Left end
✽
is a selecting cursor.
A voltage measurement inspection is not conducted.
Inspect the lighting situation of backlight visually.
Contrast changes by pushing the Main knob.
This inspection is ended when it changes 3 times.
The fault location at the time of FAIL
LCD module
5-9-2. Panel
Contents Inspect the LCD panel visually.
The following 16 patterns are displayed every 400
msec.
Seq Display Pattern Data
（
1
） （
9
）
Normal Solid 0000..
（
2
） （
10
）
Normal Solid 1111..
（
3
） （
11
）
Normal Check 0101..
（
4
） （
12
）
Normal Check 1010..
（
5
） （
13
）
Reverse Solid 0000..
（
6
） （
14
）
Reverse Solid 1111..
（
7
） （
15
）
Reverse Check 0101..
（
8
） （
16
）
Reverse Check 1010..
Advance preparation None.
Note
The contrast (Electronic volume) value is typical.
〈
Service inspection screen
〉
Left end
✽
is a selecting cursor.
The fault location at the time of FAIL
The LCD module.