Canon LV-7545U Service Manual

Contents

Canon LV-7545U Service Manual Manual pdf 57 page image

2.2 +16V Adjustment1. Input 3 Receive the 16-step gray scale video signal in VIDEO mode.2. Connect a digital voltmeter to pin 3 (+) of CN6A and ground (–).3. Turn VR681 on the power supply unit to adjust it to 15.8 ± 0.1 VDC.2.3 Video Center Adjustment1. Input 1 Receive the 16-step gray scale computer signal in COMPUTER mode.2. Enter the service mode.3. Connect a digital voltmeter to test point "TP531" (+) and ground (–).4. Select item no. "1" of group no. "5" and change data value to adjust it so that thevoltage value is 7.3 ± 0.1 VDC.5. Connect the digital voltmeter to test point "TP501" (+) and ground (–).6. Select item no. "0" and change data value to adjust it so that the voltage value is7.3 ± 0.1 VDC.7. Connect the digital voltmeter to test point "TP561" (+) and ground (–).8. Select item no. "2" and change data value to adjust it so that the voltage value is7.3 ± 0.1 VDC.2.4 PC Pedestal Adjustment1. Input 1 Receive the 16-step gray scale computer signal in COMPUTER mode.2. Enter the service mode.3. Connect an oscilloscope to test point "TP531" (+) and ground (–).4. Select item no. "16" of group no. "5" and change data value to adjust the pedestallevel and black level to be same level.5. Connect the oscilloscope to test point "TP501" (+) and ground (–).6. Select item no. "15" and change data value to adjust the pedestal level and black levelto be same level.7. Connect the oscilloscope to test point "TP561" (+) and ground (–).8. Select item no. "17" and change data value to adjust the pedestal level and black levelto be same level.Part 3: Adjustment3-11Fig. 3-3Pedestal Lebel = Black Lebel