LG RD-JT30 Service Manual page 17

2.Color Wheel Delay Alignment
Equipment:
Battery Biased Silicon PIN Detector
Oscilloscope
Probe
Procedure:
Probe impedance matches 50 ohm
Open Factory OSD, and select color wheel delay item
Leave the image pure red (DMD red curtain)
Put the detector on the screen that red image was projected.
Watch the oscilloscope and notice the square waveform
Use the " " and " " key to increment or decrement the color wheel delay value
No matter the waveform is square or not, let the waveform was lagged first
Lag
Then increment or decrement the value to let the waveform to be square
Do not adjust too much, let the signal get ahead, if it happens, go back to step 7 and do
it again.
Change the input to pure blue and repeat the above procedures again.
3.PC Color Alignment Procedure
Equipment:
Pattern generator
Procedure:
Connect power, D-sub, into projector.
Change pattern generator to pattern 43 5-DISC.
Light on projector
Enter factory mode.
Choose ADC Brightness item to Press.
Choose ADC Contrast item to Press.
Change pattern generator to pattern 32 gray bar.
See if any gray level was abnormal, if the abnormality happened, went back to
step 4 and then redid it again.
Quit factory mode, after above adjustments finished.
Exact
17
Ahead