SONY SS-SP20B
Service Manual

2-3-5. Adjustment after Assembling (PDP Module Adjustment)
1. (1) (2) (3) (4) Using Tools Digital oscilloscope : More than 200 MHz DVM (Digital Multimeter) : Fluke 87 or similar one Signal generator : VG-825 or similar one DC power supply . DC power supply for Vs (1) : Should be changeable more than 0-200 V/ more than 10 A . DC power supply for Va (1) : Should be changeable more than 0-100 V/ more than 5 A . DC power supply for 5 V (1) : Should be changeable more than 0-10 V/ more than 10 A . DC-DC Converter tool (1) : The tool which has voltage equivalent output of PDP42V5#### Module after taking the Vs, Va, 5 V voltage . Voltage stability of power supply : Within ± 1% for Vs/Va, within ± 3% for 5 V 2. Connection diagram of measuring instrument and setting up the initial voltage (1) Connection diagram of measuring instrument Refer to figure 1. (Connection diagram of measuring instrument that adjusting the voltage wave form) (2) Setting up the initial voltage Initially setting up voltage : Vcc : 5 V, Va : 65 V, Vs : 190 V But, initially setting up voltage can be changed by the set up range according to the Module�s characteristic. 3. How to Adjust (1) Adjusting initial voltage wave form Check the voltage wave form like the mentioned way on the item �3. How to Adjust� of Section 2-3-4 and readjust the wave form when it is wrong. (2) Checking the DC/DC pack voltage . Convert the signal of signal generator to the 100% Full White signal . Connect the GND terminal of DVM to the GND of Y board and set the Plus terminal to the right up leg of R9 to check the _Ve voltage (_35 ± 1 V). And when there is abnormality in voltage turn the variable resistor (VR7) of DC/DC Pack (_Ve) on Y board to adjust. . Connect the GND terminal of DVM to the R60�s right leg of the Y board and set the Plus terminal to the left leg of R60 to check the Vscw voltage (115 ± 1 V) and when there is abnormality in voltage turn the variable resistor (VR5) of DC/DC Pack (Vscw) on Y board to adjust.
PFM-42V1/42V1A/42V1E/42V1P

. Connect the GND terminal of DVM to the R8�s right leg of the Y board and set the Plus terminal to the left leg of R8 to check the _Vy voltage (_80 ± 1 V) and when there is abnormality in voltage turn the variable resistor (VR6) of DC/DC Pack (_Vy) on Y board to adjust. . Connect the GND terminal of DVM to the R89�s right leg of the Y board and set the Plus terminal to the left leg of R89 to check the Vsetup voltage (240 ± 1 V) and when there is abnormality in voltage turn the variable resistor (VR4) of DC/DC Pack (Vsetup) on Y board to adjust. (3) Measuring the Vs voltage Margin and deciding the voltage . Convert the signal of signal generator to the 100% Full Red signal. . Turn the voltage adjusting knob of Vs DC power supply to the voltage-down direction and make the cell of screen turned off. . Turn the voltage adjusting knob of Vs DC power supply to the voltage-up direction until the cell of screen turned on. The first voltage, which make the cell of full screen turned on, is named as Vsmin1 and record it. . Turn the voltage adjusting knob of Vs DC power supply to the voltage-up direction slowly until the cell of screen turned off or over electric discharge. The first voltage, which makes the cell of screen turned off or over electric discharge, is named as Vsmax1 and records it. (Only, Vs voltage variable passes over the maximum 195 V) . Convert the signal of signal generator to the 100% Full Green signal. . Repeat the adjustment (2) item and name each . . . . . . . voltage as Vsmin2/Vsmax2 and record them. Convert the signal of signal generator to 100% Full Blue signal. Repeat the adjustment (2) item and name each voltage as Vsmin3/Vsmax3 and record them. Convert the signal of signal generator to 100% Full White signal. Repeat the adjustment (2) item and name each voltage as Vsmin4/Vsmax4 and record them. Convert the signal of signal generator to 100% Full Black signal. Repeat the adjustment (2) item and name each voltage as Vsmin5/Vsmax5 and record them. At this time decided Vs voltage (Vsmin1-Vsmin5) adds 6 V to Max value and set up the voltage within the set-up range (180 V < Vs � 195 V) in consideration of other features. Turn the voltage adjusting knob of Vs DC power

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supply make deciding the Vs voltage. . Adjust Vset down wave form using setting up Vs voltage like mentioned on the item �3. How to Adjust� of Section 2-3-4 . 2-5