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This manual was very good & was very helpful with repairs.
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A good and useful manual. With these, We was abled to isolate and pin point the component that was causing the problem. The total time spent in troubleshooting is very much reduced.
4 Connect the GND probe of DMV to the GND of the Y B/D, and connect the positive probe to the lower leg of R44 to check the _Vy voltage (_175 ± 1 V). When there is abnormality in the voltage, turn the variable resistor (PS2) of DC/DC Pack (_Vy) on Y B/D to adjust it. 5 Connect the GND probe of DVM to the GND of the Z B/D, and connect the positive probe to the upper leg of B34 to check the Vzb voltage (_105 ± 1 V). When there is abnormality in the voltage turn the variable resistor (A2) of DC/DC Pack (_Vzb) on Z B/D to adjust it. 3) Measuring the Vs voltage margin and determining the voltage 1 Switch the signal of the signal generator to the 100% Full Red signal. 2 Turn the voltage adjusting knob of the Vs DC power supply in the voltage-down direction, and turn off the cells of the screen. 3 Turn the voltage adjusting knob of the Vs DC power supply in the voltage-up direction until the cells of the screen turn on. The first voltage, which turns on the cells of the entire screen, is named as Vsmin1. Record the value of Vsmin. 4 Turn the voltage adjusting knob of the Vs DC power supply in the voltage-up direction slowly until the cells of the screen turn off or until overelectric discharge happens. The first voltage, which turns off the cells of the screen or causes over-electric discharge, is named as Vsmax1. Record the value of Vsmax1. (Note that the Vs voltage variable should exceed the maximum of 195 V.) 5 Switch the signal of the signal generator to the 100% Full Green signal. 6 Repeat the previous adjustment step (2), and record each voltage as Vsmin2/Vsmax2. 7 Switch the signal of the signal generator to 100% Full Blue signal. 8 Repeat the previous adjustment step (2), and record each voltage as Vsmin3/Vsmax3. 9 Switch the signal of the signal generator to 100% Full White signal. 0 Repeat the previous adjustment step (2), and record each voltage as Vsmin4/Vsmax4. !- Switch the signal of the signal generator to 100% Full Black signal. != Repeat the previous adjustment step (2), and
record each voltage as Vsmin5/Vsmax5. ![ At this time, the maximum voltage is set by adding 6 V to the Vs voltage (Vsmin1 to Vsmin5). Set the voltage within the setting range (180 V < Vs < 195 V) while considering other characteristics as well. !] Turn the voltage adjusting knob of the Vs DC power supply, and determine the Vs voltage. !\ Adjust the Vset-down waveform by setting the Vs voltage as described in 2-3-4. 4) Adjusting the final voltage waveform 1 Check the voltage waveform as described in 2-3-4 (3. How to adjust), and readjust the waveform when it is out of range. 5) DC-DC Pack voltage setup range V1st : 100V to 160 V Vsc : 100 V to 160 V _Vy : _160 V to _200 V _Vzb : 100 V to 160 V
PFM-42X1/42X1N
2-5
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