Read Sharp LL-T2020 (serv.man8) Service Manual online
LL-T2020
WAVE FORM
5 – 1
CHAPTER 5. WAVE FORM
Waveform measurement condition: Input each of the display patterns
and measure the waveform (tinming chart).
and measure the waveform (tinming chart).
CAUTION
WAVE FORM 1: REFCK (LD565)
Frequency: 81MHz
Display screen: Arbitrary
2V/DIV, 10ns/DIV
WAVE FORM 2: XTAL (IC601 of 2PIN)
Frequency: 24MHz
Display screen: Arbitrary
1V/DIV, 25ns/DIV
WAVE FORM 3: VSYNC (LD305, LD318)
Frequency: 60Hz
Display screen: Arbitrary
1V/DIV, 5ms/DIV
WAVE FORM 4: HSYNC (LD304, LD317)
Frequency: 75kHz
Display screen: Arbitrary
1V/DIV, 5
µµµµ
s/DIV
Wave-form
No.
Measurement
point
Name of
waveform
Display pattern
1
LD565
REFCK
Arbitrary
2
IC601 of 2PIN
XTAL
Arbitrary
3
LD305, LD318
VSYNC
Arbitrary
4
LD304, LD317
HSYNC
Arbitrary
5
LD502
ICK
Arbitrary
6
LD504
VS
Arbitrary
7
LF505
IHS
Arbitrary
8
IC701 of 10PIN DCLK
Arbitrary
9
IC701 of 9PIN
DEN
Arbitrary
10
LD300, LD301,
LD302
LD302
RGB OUT
16 monochromatic
gradation patterns
gradation patterns
Oscilloscope: Tektronix644B
Input signal:
VESA1600 x 1200
H: 75kHz V: 60Hz
DOTCLK: 162MHz
GND
GND
GND
GND
LL-T2020
WAVE FORM
5 – 2
WAVE FORM 5: ICK (LD502)
Frequency: 81MHz
Display screen: Arbitrary
1V/DIV, 5ns/DIV
WAVE FORM 6: VS (LD504)
Frequency: 60Hz
Display screen: Arbitrary
1V/DIV, 5ms/DIV
WAVE FORM 7: IHS (LD505)
Frequency: 75kHz
Display screen: Arbitrary
1V/DIV, 5
µµµµ
s/DIV
WAVE FORM 8: DCLK (IC701 of 10PIN)
Frequency: 81MHz
Display screen: Arbitrary
1V/DIV, 5ns/DIV
WAVE FORM 9: DEN (IC701 of 9PIN)
Frequency: 75kHz
Display screen: Arbitrary
1V/DIV, 5
µµµµ
s/DIV
WAVE FORM 10: RGB OUT ( LD300, LD301, LD302)
Display screen: 16 monochromatic gradation patterns
0.5V/DIV, 5
µµµµ
s/DIV
GND
GND
GND
GND
GND
GND
Display