Canon LV-7545U Service Manual

Contents

Canon LV-7545U Service Manual Manual pdf 61 page image

[1080i A/D input adjustment]1. Input 3 Receive the 16-step gray scale component [1080i] signal in COMPONENTmode.2. Enter the service mode.3. Connect an oscilloscope to test point "TP21G" (+) and ground (–).4. Select item no. "0" of group no. "3" and change data value to adjust it so thatwaveform amplitude "a" is 0.9 ± 0.1 V.5. Connect the oscilloscope to test point "TP21B" (+) and ground (–).6. Select item no. "4" and change data value to adjust it so that waveform amplitude "a"is 0.9 ± 0.1 V.7. Connect the oscilloscope to test point "TP21R" (+) and ground (–).8. Select item no. "2" and change data value to adjust it so that waveform amplitude "a"is 0.9 ± 0.1 V.2.11 HDTV Gain Adjustment1. Input 3 Receive the 16-step gray scale component [1080i] signal in COMPONENTmode.2. Enter the service mode.3. Connect an oscilloscope to test point "TP531" (+) and ground (–).4. Select item no. "4" of group no. "4" and change data value to "600". Then, reduce thedata value and adjust it so that waveform "a" has the minimum amplitude.5. Connect the oscilloscope to test point "TP501" (+) and ground (–).6. Select item no. "5" and set the data value to "600". Then, reduce the data value andadjust it so that waveform "a" has the minimum amplitude.7. Connect the oscilloscope to test point "TP561" (+) and ground (–).8. Select item no. "3" and set the data value to "600". Then, reduce the data value andadjust it so that waveform "a" has the minimum amplitude.Part 3: Adjustment3-15(a)Fig. 3-9White Level(a)Fig. 3-10Perform this adjustment after HDTV pedestal adjustment.CAUTION